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SECTION 3
OPERATION
3.1 GENERAL
This section describes the functions of the controls and connectors available on the MSR 6420 Remote Control Unit. This section also provides complete operating instructions pertaining to the use of the MSR 6420.
3.2 FRONT PANEL CONTROLS AND CONNECTORS
Refer to Figure 3.1 for Control and Connector locations on the Front Panel of the MSR 6420.
3.2.1 MICROPHONE/CW CONNECTOR
This five-pin connector accepts a microphone, handset or CW key. The microphone may be either a carbon type or a high or low level dynamic type. The MSR 6420 is normally configured for the high level dynamic microphone that is shipped with the RCU. Switch S8 on the audio board configures the RCU for the various microphone types (see section 2.12).
When the system is keyed using this connector, the rear panel audio inputs are inhibited and replaced by microphone audio, which is sent from the RCU to the transmitter. This keyline is always active unless disabled via the MIC OFF menu. A CW key connected here will key the system in all modes, but CW sidetone will be produced in the front panel speaker only when the system is in the CW mode.
3.2.2 HEADPHONE JACK
The Headphone Jack accepts a standard 1/4 inch two-circuit plug from headphones. Use of the Headphone Jack does not cut off speaker audio. Headphones of 600 ohm impedance or more are recommended.
3.2.3 SPEAKER SWITCH
This switch turns the internal speaker on or off.
3.2.4 AC POWER/VOLUME CONTROL KNOB
When this knob is in the fully CCW position, RCU primary power is cut off. Rotating the knob slightly CW turns on primary power and holds speaker and headphone audio to a minimum. Further CW rotation increases volume.
3.2.5 SPEAKER
The speaker provides both received audio and CW sidetone.
3.2.6 RX INDICATOR
This indicator lights when the MSR 6420 is displaying a Receive frequency.
3.2.7 TX INDICATOR
This indicator lights when the MSR 6420 is displaying a Transmit frequency.
3.2.8 Frequency Display
This display indicates the current frequency being used by the radio which is being controlled or monitored by the MSR 6420. The RX Indicator and the TX Indicator define whether the frequency in the Frequency Display is a receive or transmit frequency
3.2.9 CHANNEL DISPLAY
This display indicates the current channel selected in the radio which is being controlled or monitored by the MSR 6420.
3.2.10 FUNCTION/STATUS DISPLAY
This display provides a variety of intelligent feedback messages and status updates to the RCU operator. The message displayed relates to the control function currently taking place. For example, if the operator is performing a transmitter power level change with the RCU, this display will first indicate the present power level of the controlled transmitter. The display will then indicate that a request to change the power level has been made, and finally, will inform the operator that a successful power level change has occurred.
3.2.11 KEYPAD PUSHBUTTONS
Most MSR 6420 remote control functions are initiated using the keypad pushbuttons. Included are numeric buttons, menu select buttons and 11 special function keys. Each type of pushbutton is explained in one of the following sections. Refer to Figure 3.1 for pushbutton locations.
3.2.11.1 Function Pushbutton (FCTN)
This button allows the operator to "scroll through" all available menus. Only three menus can be viewed at any time in the three menu displays. Each time the FCTN button is pushed, a new set of three menus is displayed. After all menus have been displayed, the first set will be shown again. If the RCU is in a mode with only three or less menus available, pressing the FCTN button will have no effect.
3.2.11.2 Recall Pushbutton (RCL)
This button operates identically to the function (FCTN) pushbutton, except that it scrolls through the menu displays in the opposite direction. If the FCTN button is used to scroll forward to the next set of three menus, a press of the RCL button will scroll back, returning the original menus to the menu displays.
3.2.11.3 Priority Channel Button (PRI CHAN)
The priority channel button allows the operator to select a radio's priority channel with a single keystroke, saving valuable time during emergency situations. See section 3.5.4 for full details.
3.2.11.4 Channel Button (CHAN)
The channel button readies the RCU to select, review or reprogram stored channels in the controlled radio's channel memory. Refer to section
3.5.3 for explanation and instructions.
3.2.11.5 Frequency Button (FREQ)
The frequency button prepares the RCU to accept a new radio operating frequency. This can be during stored channel programming (section 3.5.3) or while actually operating the radio in the FREQUENCY MODE (section 3.5.5). Frequency mode operation allows the operator to alter the radios' frequencies without recalling or programming stored channels.
3.2.11.6 Numeric Buttons (0-9)
The Numeric Button allow entry of numeric data, such as channel number, operating frequency or radio address.
3.2.11.7 Enter Button (ENT)
The Enter Button completes and finalizes a data entry sequence. For example, when a new radio operating frequency or stored channel number is entered using the Numeric Buttons, the radio's operating frequency or channel do not change until ENT is pressed. The ENT button is used to complete a variety of data entry sequences as detailed in sections 3.5, 3.6 and 3.7.
3.2.11.8 Clear Button (CLR)
The Clear Button allows the operator to abort a control sequence before the control is sent to the radio. This can be used to remove incorrect commands or when the operator desires to merely "view" stored information without altering that information. See sections 3.5, 3.6 and 3.7.
3.2.11.9 Up, Down and "*" Buttons
These buttons can serve a variety of purposes, such as moving to the next higher (UP) or lower (DOWN) channel during scanning. See menu directions for different uses.
3.2.11.10 Menu Select Buttons (A,B,C)
These buttons are used to select the menu offered in the menu display beside each button. For example, to select the MODE menu, the operator scrolls through the available menus until the MODE menu appears in one of the three menu displays. When the menu select button beside the MODE menu is pressed, the RCU enters the MODE routine.
3.2.12 MENU DISPLAYS
These displays allow the operator to view the various control routine options available at any given time. Various layers of menu options may be available during different steps of a program routine. For example, when the operator wants to change a radio's operating mode, he scrolls through the top layer of menus until the MODE menu appears in the menu displays. When he selects the MODE menu, a secondary layer of menus consisting of the various different modes appears in the displays. See section 3.5.2 for complete instructions regarding use of the menus. Table 3.2 lists menus available with the various remote control modes.
3.2.13 BAR-GRAPH METER
This 20-segment bar-graph meter can display forward or reflected power, received signal strength or audio signal level. The type of measurement depends on the radio currently being controlled by the MSR 6420. If an MSR 6700A exciter is being controlled, the meter will indicate forward or reflected power, and the PWR indicator to the left of the meter will be lit. Control of an MSR 5050A will yield meter indication of received signal strength (dBuV indicator lit) or audio level (no indicators lit). When an MSR 8050A transceiver is being controlled, the meter will give a received signal strength reading until the transceiver is keyed. The meter then switches to a forward or reflected power indication. Different measurement selections can be made using the METER SELECT menu.
The bar-graph meter is not a precision instrument. One limitation is that it is made up of only 20 discreet segments; another is that it relies on the digital communication between the RCU and radio for its information. The meter receives an update each time the radio's front panel meter is sampled, which is less frequent the lower the remote control Baud rate.
At 300 Baud, the meter is updated approximately once per second. Therefore, to get a good power measurement, the operator must key the transmitter for at least a second, with audio constantly applied (CW tone or long whistle into microphone). At higher Baud rates, the meter will be updated much more frequently, but obviously the RCU meter cannot match the continuous instantaneous measurement that the radio analog meter can display.
3.2.13.1 Power Indicator LED (PWR)
This indicator, to the left of the bar-graph meter, is lit whenever the meter is displaying a forward or reflected RF power measurement. It is continuously lit when the RCU is controlling an MSR 6700A exciter, and also whenever a controlled MSR 8050A transceiver is keyed. The meter scale during an RF power reading is relative: for forward power, unity scale (1.0) is 100W for power levels 1 or 2, and 1000W for power levels 3 and 4. Unity scale for reflected power measurements is 10W.
3.2.13.2 Signal Strength Indicator (dBuV)
This indicator LED, also situated to the left of the bar-graph meter, is illuminated whenever the meter is displaying receiver incoming signal strength. This will occur whenever the controlled receiver or transmitter front panel meter is measuring signal strength. A full scale reading on the bar-graph meter during a signal strength measurement is 100 dBuv.
3.2.13.3 Receiver Audio Measurement
When neither the PWR or dBuV indicator LEDs are lit, the bar-graph meter is displaying receiver audio level.
3.2.14 KEYED INDICATOR
The KEYED LED is lit whenever the exciter or transceiver controlled by the RCU is keyed. The
key command can come from the RCU (either a tone key signal on the audio lines or a serial keying command) or from some other keying command at the radio.
3.2.15 READY INDICATOR
This indicator is lit whenever an antenna coupler controlled via the MSR 6420 signals a ready state. This will occur after a successful tune cycle. It must be noted that if the transmitter frequency is changed after a tune cycle, the READY LED will still be lit. If the transmitter is then keyed, the coupler will experience a VSWR fault and the READY LED will go out. Refer to the coupler menu in Table 3.2 for more details.
3.3 REAR PANEL CONNECTORS
See figure 3.2 for rear panel connector locations.
3.3.1 LINE POWER MODULE
This module contains the AC line connector, primary fuse and voltage selector. A 1A no-timedelay fuse is used for 115 VAC operation and a 1/2 A no-time-delay fuse for 230 VAC. See section 2.6 for line voltage selection instructions and AC input specifications.
3.3.2 STANDARD AUDIO CONNECTOR, J1
This female DB-9 connector interfaces transmitter and receiver audio with other external equipment. The 60022 Standard Audio input on J1 accepts audio from external equipment, which is sent on to the transmitter via J9 or J12. Conversely, receiver audio inputs which reach the MSR 6420 at J9 or J12 are available at the Received Standard Audio Ouptuts on J1. A PTT input allows the external equipment at J1 to key the system. See section 2 for full specifications.
3.3.3 STANDARD DATA CONNECTOR, J2
This connector is identical to J1 except that it is functional only when the radio system is in the DATA mode. J2 interfaces the radio system, through the MSR 6420, to an external modem. Receiver audio that comes into the MSR 6420 via J9 or J12 is available at Received Standard Data output pins. Data input from the modem is sent out to the radio via J9 or J12. J2, like J1, is a female dB-9 connector. The PTT input, as well as the audio connections, are operational only when the system is in the Data mode. The Data mode is available only with the MSR 8050A transceiver, so this connector should not be used unless there is an MSR 8050A in the system.
3.3.4 ISB AUDIO CONNECTOR, J3
This female DB-9 connector is identical to the Standard Audio connector, J1, except that J3 audio connections run to the ISB audio lines instead of the Standard Audio lines. See section 2 for complete input and output specifications.
3.3.5 AUXILIARY CONNECTOR, J4
This female DB-9 connector provides an assortment of inputs and outputs, including auxiliary speaker driver output lines. See section 2 for complete input and output specifications.
3.3.6 DC INPUT, J5
The MSR 6420 can presently run on AC input only. In the future, J5 will provide an input to run the MSR 6420 from an external DC supply.
3.3.7 CONTROL STATUS INPUT CONNECTOR, J7
This female DB-9 connector provides control line inputs and outputs to interface the MSR 6420 to the radio system. Note that this connector can be used for RS-232C, RS-422, RS-423 or MIL-STD188C only. FSK modem control lines must be connected to J9 or J12. If the radio system configuration requires that several MSR 6420s be "daisy-chained" together, one leg of the chain would connect to J7, the other to J8. Note the complementary nature of J7 and J8. J7 pin 6 is RX B, while J8 pin 6 is TX A. Incoming control signals at J7-6 will be present at J8-6, which can then provide this same signal to the next MSR 6420 RCU in the chain. Similarly, J8-3 is RX A while J7-3 is TX B, to send on control signals coming from the opposite direction.
Note that the connector types are also complementary. J7 is a female DB9 connector, while J8 is a male DB9 connector. If an RCU in the middle of a "daisy-chained" network is removed for service or repair, system communication may be maintained by plugging the connector that mated at J7 into the cable connector at J7.
See section 2 for complete input and output specifications, and for system interconnect instructions.
3.3.8 CONTROLSTATUS OUTPUT CONNECTOR, JS
This male DB-9 connector provides RS-232C, RS-422, RS-423 and MIL-STD-188C interfacing between the MSR 6420 RCUs and the radio systems. This connector is used in conjunction with J7 when several MSR 6420 RCUs are "daisy-chained" together. See section 2 for complete input and output specifications and for system interconnection instructions.
3.3.9 REMOTE FSK CONNECTOR, J9
This female DB-25 connector, along with J12, contains all inputs and outputs required to transfer all FSK control and system audio signals between the RCU and the radio system. Connections are provided to allow either two-wire or fourwire hook-ups for standard audio, ISB audio, or the FSK control/status lines. This connector is used in conjunction with the other remote FSK connector, J12, when multi-remote configuration requires "daisy-chaining" lines from one RCU to another. See section 3.3.11. See section 2 for complete input/output specifications and system interconnection instructions.
3.3.10 COMPUTER (RS-232) CONNECTOR, J10
This female DB-25 connector allows a computer, using its RS-232C port, to control the radio system. J10 has the standard RS-232 pin out, allowing a standard RS-232C cable to be used between the computer and the MSR 6420. See section 2 for complete input/output specifications.
3.3.11 REMOTE FSK CONNECTOR, J12
This male DB25 connector is used in conjunction with J9 in multi-remote systems where audio and FSK control/status lines are "daisy-chained" between RCUs. Connections are provided for twoor four-wire standard audio, ISB audio, and FSK. The signals at J12 are differentiated by those at J9 by the "C" and "D" designators (J9 signals have "A" and "B" designators). For example, if two MSR 6420s are alternately controlling an MSR 8050 transceiver, the transceiver audio and FSK control lines would be connected to the first RCU at J12. The FSK and audio connections between the RCUS will run from J9 on the first RCU to J12 on the second. Note that J9 is a female DB25 while J12 is a male DB25 connector. If an RCU in the middle of a "daisy-chained" network is removed for service or repair, system communication may be maintained by plugging the connecting cable at J9 into the connecting cable at J12. See section 2 for complete input/output specifications and system interconnection instructions.
3.4 INTERNAL CONTROLS
All of the MSR 6420 internal controls, consisting of dip switches, jumpers and potentiometers, are set up during initial installation. No changes to any of these controls should be necessary after installation is complete. See section 2 for full instructions for setting up all internal controls during installation.
3.5 SINGLE-REMOTE OPERATION
The MSR 6420 is an extremely versatile remote control unit and can control a variety of MACKAY radios in various configurations.
The main configurations are:
a) Single-Remote operation. A single MSR 6420 controls a radio or system of radios, in any combination of MSR 6700A exciters, MSR 5050A receivers or MSR 8050A transceivers. Up to 100 radios may be controlled.
b) Joint Control operation. A single MSR 6420 simultaneously controls a receiver/exciter pair. See section 3.6.
c) Multi-Remote operation. Two or more MSR 6420s (up to 100) control a radio or system of radios. See section 3.7.
d) Computer Control. A system of radios is controlled by a computer via the MSR 6420 RS232C port. All commands pass through, and are monitored by, the MSR 6420. See CSW 1000 Technical Manual for details.
This section gives detailed operating instructions for the SINGLE-REMOTE operating mode. Most of the procedures used in this basic mode are also used in the JOINT CONTROL and MULTI-REMOTE modes.
Before attempting remote control operation of any radios, local operation of those radios should be thoroughly checked out. The RCU operator must be familiar with the basic local control of all radios to effectively control the system from the RCU. See the technical manuals for the MSR 6700A, MSR 5050A and MSR 8050A for complete local control instructions. The next step is to ensure that system interconnect wiring and internal switch settings are correct for the type of remote control data mode desired. See section 2 of this manual for system interconnect wiring diagrams and RCU internal switch settings. See radio technical manuals to verify switch configurations for the radios.
To prepare the radios to accept remote control, put each radio into the REMOTE mode. Simply press the REM pushbutton on the radio front panel. The pushbutton LED will light, indicating that the radio is ready to accept RCU commands.
Alternatively, the radios may be switched into the REMOTE mode by the RCU. Note that most of the radio's front panel controls are non-functional when the radio is in the REMOTE mode. See individual equipment manuals for details.
If the RCU operator is unfamiliar with the operation of the MSR 6420 RCU, sections 3.5.1 through 3.5.5, sequentially followed, will lead the operator through these steps:
a) Establish link-up between RCU and radio.
b) Use RCU menu displays to review stored channel information or completely re-program stored channels, then operate the radio in the CHANNEL MODE using the stored channels.
c) Operate the RCU and radio in the simpler FREQUENCY mode of operation, without the benefit of stored channel memory.
3.5.1 SELECT UNIT OPERATION
Each radio and RCU in a system is identified by its own individual address code. All commands sent out by the RCU are preceded by the address code of the radio being controlled. The command is then heard but ignored by all radios in the system except the radio with the specified address. The SELECT UNIT OPERATION allows the RCU operator to select the address of any radio in the system. The RCU will then attempt to link-up with that radio. If a successful link-up is accomplished, the operator is notified and he may then proceed to remotely operate the controlled radio. If a link-up is not possible, the operator is informed via the RCU displays. The select unit procedure is as follows:
a) Press the FCTN key until the "SELUNIT" Menu appears in one of the menu displays.
b) Press the menu selection key (A, B, or C) beside the "SEL UNIT" menu.
c) The RCU function/status display will show "ENTER ADR: 20" where 20 is the address of the radio previously controlled by the RCU or "ENTER ADR: **".
d) Use the numeric keys to enter the two-digit address of the radio that you want to control.
e) Press "ENT" to enter this address.
f) The RCU will attempt to link-up with the addressed radio. If successful, the RCU's displays will indicate the type of radio being controlled, its address, and the radio's current channel and operating frequency.
g) If a link-up is made, but the addressed radio is not in the REMOTE mode, the RCU displays will indicate that the radio is in the LOCAL control mode. The RCU can then put the radio into the remote mode. Simply scroll through the available menus until the "REMOTE" menu appears, and press the corresponding menu select button.
If the RCU is unable to establish a link with the radio being addressed, it will display "UNIT NOT IN NET", meaning that it can contact no radio with the specified address in the network connected to the RCU. Possible causes:
a) No radio has the specified address. b) The radio with the specified address has been turned off.
c) Improper wiring between RCU and radio.
See Table 3.1 for instructions to determine or modify the address of a radio.
Table 3.1 Determining or Setting the Address of a Radio
1) Make sure the radio is in local mode.
2) Press 'E', then '5' on the radio keypad.
3) Addr XX will appear in the radio frequency display, where XX is the radio's current two-digit address.
4) If this address is okay, press clear to exit address set routine.
5) To change address, simply punch in new two-digit address (single digit address must be preceded by a zero, as in 06), then press the E (Enter) button.
See the radio's technical manual for complete information.
3.5.2 MENU DRIVEN CONTROLS
There are four different ways to initiate a control command from the MSR 6420. Three use the following pushbuttons located on top of the front panel pushbutton matrix:
a) PRI CHAN
b) CHAN
c) FREQ
The fourth, and most versatile method, involves the three menu displays and the corresponding "menu select" keys (A, B, C) beside them.
To select a control function or change a radio parameter using the menu displays, the operator scrolls through the available menus until the desired menu appears in one of the menu displays. The FCTN and RCL pushbuttons are used to scroll through the displays. Each time either of these buttons is pushed, a new set of three menus appears in the displays. FCTN scrolls the menus in one direction, RCL in the opposite.
When the desired menu appears in one of the displays, the menu is activated by pressing the menu select button beside it. The menu displays will then show all available options related to that menu, and the RCU function/status display will show the operator the radio's current status relative to the selected menu.
Example: MSR 6420 RCU operator wants to change the output power level of an MSR 6700A/ MSR 1020 1 kW amplifier system. Four power levels are available: LEVEL 1, nominal 20W; LEVEL 2, nominal 125W; LEVEL 3, nominal 500W; and LEVEL 4, nominal 1000W.
The system is presently at PWR 2, 125W, and the operator wants to switch the output power to 1000W.
See Table 3.2 for a list of the basic top layer menus, menu options and explanations. The control sequence is as follows:
a) Operator scrolls through menu displays using the FCTN or RCL keys until "POWER" appears in one of the menu displays.
b) Operator presses the menu select key beside the menu displaying "POWER".
c) The function/status display will now show the present exciter status relative to the menu selected. Since "POWER" was selected, and the system is now set to 125W, the display will read "PWR LVL: 2".
d) The menu displays will simultaneously change to show available power options: LEVEL 1, LEVEL 2, LEVEL 3 and LEVEL 4. Note that there are four options and only three menu displays: The FCTN and RCL keys are again used to scroll to the fourth option.
e) The operator now presses the menu select key beside the menu displaying "LEVEL 4".
f) The RCU sends a command to the exciter, telling it to switch to the 1000W power level. A momentary display of "RQ power: lvl 4" (for request power change to level 4") is shown as the RCU waits for the exciter to report back its new power level status.
g) The RCU function/status display switches to 9 e neid olano la mine "Power selected" after the exciter informs the RCU that it has switched over to the 1000W level. The menu displays now return to to presenting the various menus, instead of the power level options.
Alternatively, if there were no 1kW LPA in the system, or it the amplifier were turned off, a selection of power level 3 (500W) or power level 4(1000W) would not be possible. The control sequence would be identical from step a to step f, and the sequence would then be altered as follows:
g) The exciter is not able to comply with the request to switch to the 1000w level, and it reports back to the RCU this unchanged status. The RCU display now becomes "PL not changed" (for "Power Level not changed"). The display then informs the operator of the exciters actual power level status with "PWR LVL: 2". The menus then switch back from showing available power options to displaying various menus.
3.5.3 CHANNEL MODE OPERATION
Radio operation is divided into two basic modes: CHANNEL MODE and FREQUENCY MODE. When in channel mode operation, the RCU selects a previously stored channel and then commences radio operation. In contrast, an operator using frequency mode operation will type the radio operating frequency directly from the keypad, without calling up stored frequencies. Frequency Mode operation is discussed in paragraph 3.5.5.
The RCU operator can call up any of the channels stored in the radio's memory. That channel's various parameters (frequency, mode, etc.) can then be viewed by the operator without affecting the radio or the stored channel memory. See Table 3.3 for listings of storage parameters for various radios.
If the operator decides to select this channel, the radio will switch over to the selected channel, and radio system operation may begin.
The operator may also decide to modify some of the stored channel parameters, or to program a completely new channel and store it in the radio's stored channel memory. Complete instructions for viewing, selecting, modifying or programming radio channels are detailed in Table 3.4 (Stored Channel Operations).
3.5.3.1 Radio Operation in Channel Mode
The RCU operator may begin radio system control and operation as soon as the desired stored
channel is selected. If an antenna coupler is part of the radio system, it should be tuned via the COUPLER MENU unless the system is set to an AUTO-TUNE mode.
The operator may change radio operating parameters without switching to a new channel. Simply select the desired menu and menu option (see 3.5.2).
NOTE
Some change requests made via the RCU menu displays cannot be carried out by the radio. If this occurs, the RCU displays will inform the operator of the lack of change, followed by an update of the radio's actual status.
Example: RCU operator attempts to switch an MSR 5050A receiver from USB mode into the ISB mode, but the receiver does not have the ISB option installed. The sequence of events is as follows:
a) RCU menu select key beside "ISB" is pushed
b) RCU sends command to MSR 5050A to change detector mode to ISB
c) MSR 5050A answers that change cannot be made
d) RCU function/status displays inform the operator of failure to change with "mode not changed".
e) The RCU will then display the MSR 5050A'S current mode with "MODE: USB".
See individual radio technical manuals and Table 3.3 for more examples of unallowed parameters.
3.5.4 PRIORITY CHANNEL
The PRI CHAN button on the MSR 6420 keypad allows the RCU operator to select a radio's priority channel with a single keystroke, saving valuable time in emergency situations.
Channel 90 is always designated as the priority channel in each radio. This channel's frequency, mode, etc. is programmed into the radio's channel storage memory the same as any other channel using the channel programming routine (see Table 3.4). Priority channel 90 is identical in all respects to the radios other 98 stored channels, with the single exception that it can be instantly called up using the PRI CHAN button.
3.5.5 FREQUENCY MODE
Frequency mode operation provides a quick method for the operator to control a radio without having to select previously stored channels or modify existing channels. Operations performed while in the frequency mode are not stored in memory and will not be recalled the next time the RCU re-enters frequency mode operation.
To operate in the frequency mode:
a) Press the FREQ button. "FREQUENCY MODE" appears in the function/status display.
b) Enter new operating frequency. Remember that new frequency is not transferred to the radio until keypad entry is terminated by "ENT". The "CLR" button can be used to clear out erroneous frequency entries.
c) Press "ENT" key. The radio will switch over to the new frequencies. The channel displays of both the RCU and the radio will indicate channel 00. This is the "scratchpad channel". Note that the only change in the radio's operating parameters is the frequency. Mode, filter, AGC and BFO (receiver), or Mode and power level (exciter), do not change. The frequency mode can therefore be used to change to a new operating frequency while keeping all other parameters constant.
d) All other operating parameters may also be changed using the menu displays. Transmitter emission mode may be changed while in the emission mode may be changed while in the frequency mode at any time except when the unit is keyed. This differs from channel mode operation. In channel mode, the transmitter mode can only be changed when programming a channel.
3.5.6 RECEIVER SCAN ROUTINE
The MSR 6420 can command a receiver to scan an unbroken sequence of up to 99 stored channels. As many as 100 of these "blocks" of channels can be preprogrammed and stored in the RCU memory. The operator can program each scan block individually for the desired scan rate, dwell time and other scan control features. Each block can be programmed to be controlled either by the MSR 6420 internal squelch or by a "Scan Stop" signal from an external modem.
The MSR 6420 scan operating and scan programming routines are extremely versatile and have several layers of menu offerings. The menus are arranged to allow quick selection of the various scan operation features.
The RCU operator should become familiarized with receiver scanning terminology before continuing with these instructions. SeeTables 3.5 and 3.6.
3.5.6.1 Scan Block Programming
An entire layer of menus is available to facilitate the programming of scanning features. This programming layer may be manipulated just like the top layer of basic menus, as explained in 3.5.2. The FCTN and RCL buttons can be used to scroll through this layer of menus to bring the desired menus to the displays. The CLR button may be used to abort a program sequence without changing stored information.
Some features available with the scan routine menus are:
a) Menus are displayed in groups of related menus.
b) The RCU's function/status display shows present scan routine status relative to the group of menus displayed. This status display is provided as soon as the group of menus is displayed, rather than after a menu is selected, as is the case with other menu layers.
c) All programming selections made when in the scan programming routine are placed in a temporary RAM memory. When the programming routine is left using the EXIT PRG menu, all information is moved to permanent memory. If the programming routine is aborted using the CLR key, the temporary RAM memory is lost and previously stored scan block information is unchanged.
To program a scan block, select the SCAN PRG menu. The scan programming layer of menus is now available. Use these menus to change any or all of the following scan features:
SCAN BLOCK number (use 00 to 99) START CHANNEL
STOP CHANNEL
SCAN TIME (1,2,3,or 4 sec. per channel) DWELL TIME (1,2,3, or 4 seconds)
HANG (ON or OFF)
SQUELCH (internal "SQU STOP" or external "EXT STOP"
Remember to press ENT to complete any numerical entry (or CLR to abort). Currently stored information relating to the menus displayed is exhibited in the function/status display so the programmer can quickly scroll through the programming layer of menus and view current settings of all of the above features.
When all features are set to their desired value or state, select the EXIT PRG menu to transfer programmed features into permanent memory and return to top layer of menus. The operator must exit the scan programming routine, then return to it, to program additional scan blocks. This is required to enter each block into permanent memory.
The operator may choose to abort any programming sequency without altering permanent scan block memory by exiting the programming routine using the CLR button.
3.5.6.2 Scan Operation with External Stop
This section describes the operation of the system when scanning if EXT STOP is selected. Operation when SQU STOP (squelch stop) is selected is explained in 3.5.6.3.
Whenever the SCAN ON menu is selected, the system will begin scanning the scan block that was last selected or programmed. To scan a different scan block, select the SCAN PRG menu; the current scan block will be displayed. To change blocks, use the PRG SBLK menu to enter a new block number. Scroll through programming menus to verify scan block features or select the EXIT PRG menu to leave the programming layer of menus.
Now select the SCAN ON menu to begin scanning. The function/status display will indicate externally controlled scanning with "EXT SCANNING 62" where 62 is the number of the scan block. The menu displays offer PAUSE, CONTINUE, and SCAN STOP.
The receiver will operate at the start channel, wait there for the programmed scan time, and then switch to the next channel. This will continue until scanning is stopped. The following conditions will halt external scanning:
a) Selection of the PAUSE menu. The receiver will stop at the channel in operation at the instant that PAUSE was selected. The operator may scan up to higher or down to lower channels using the UP and DOWN keys. Continuous scanning will be resumed when the CONTINUE memory is selected.
b) A low signal at the SCAN STOP input. All scanning will cease until the SCAN STOP input is high again. The UP and DOWN keys, along with the CONTINUE menu, are inoperative when SCAN STOP is low.
c) Selection of the SCAN OFF menu. This will stop scanning and the RCU will leave the scanning routine completely.
3.5.6.3 Scan Operation With Internal Squelch
This section describes scan operation when SQU STOP (squelch stop) is selected, activating the MSR 6420 RCU internal squelch. Operation when EXT STOP is selected is explained in section 3.5.6.2.
To begin scan operation, follow the procedures detailed in 3.5.6.2. When scanning is started, the RCU display will be "SCANNING BLK 62" where 62 is the number of the scan block.
The receiver will start scanning at the scanning block's stored "START CHANNEL", pause there for the stored SCAN TIME and then move up to the next highest channel. If the MSR 6420 receive audio lines get a signal of sufficient strength to break the RCU internal squelch, the receiver will pause for the stored SCAN TIME plus the stored DWELL TIME. If the HANG feature is selected, the receiver will pause as long as the received audio is present.
NOTE
See section 2.14 for squelch control adjustment instructions.
If more than one receiver is being controlled, the audio output of each must be set to provide the same signal level at the MSR 6420. This is necessary to ensure that a single MSR 6420 squelch setting will work with all receivers. See MSR 5050A and MSR 8050 A manuals for locations of receive audio level controls. For extremely long audio cable runs, an external audio amplifier may be required.
The PAUSE, CONTINUE and SCAN menus can be used during squelch controlled scanning. These menus, and the UP and DOWN keys, function the same as in scan operation with external stop (see section 3.5.6.2).
3.6 JOINT CONTROL
The MSR 6420 can simultaneously control receiver/exciter pairs in half-duplex operation. This JOINT CONTROL mode greatly reduces the number of keystrokes required. The following explanation assumes that the operator is familiar with SINGLE-REMOTE operation as explained in 3.5.
In the JOINT CONTROL mode, the receiver and exciter always operate onthe same channel. The joint control channel programming procedures provide for easy simultaneous set-up of both the exciter and receiver channel memories. "Halfduplex" operation means that the receiver and exciter can operate at the same, or at different frequencies. Receiver audio is muted whenever the exciter is keyed.
Three of the menus unique to JOINT CONTROL are: SEL RCVR, SEL XCTR and RX-TX.
An understanding of the features provided by these menus yields a basic understanding of the JOINT CONTROL mode. Refer to Table 3.7 for a description of all joint control menus.
3.6.1 SEL RCVR/SEL XCTR MENUS
This pair of menus replaces the SEL UNIT menu used in the basic SINGLE-REMOTE operating mode. JOINT CONTROL mode involves the simultaneous control of an exciter/receiver pair, so the RCU must simultaneously be linked-up with both an MSR 6700A exciter and an MSR 5050A receiver.
When the MSR 6420 is put into the JOINT CONTROL MODE, it initially attempts to link up with the receiver/exciter pair that were last controlled. If those two radios are no longer in the system, or if control of a different receiver or exciter is desired, the addresses of the new radios are entered using the SEL RCVR/SEL XCTR menus. Once the RCU establishes a link with the radios, both addresses are displayed.
3.6.2 RX/TX MENU
In JOINT CONTROL, a receiver/exciter pair are operated in tandem. The RX/TX menu allows the operator to choose which radio of the pair is the primary focus of RCU at any given moment. The TX and RX LEDs, situated just to the left of the frequency display, indicate whether the receiver or the transmitter is currently selected. Each time the RX/TX menu is selected, the RCU's primary focus alternates between the exciter and the receiver.
When the receiver is selected, the RX LED is lit, and the frequency display shows the receiver's operating frequency. If the operator enters the CHANNEL MODE to store radio operating parameters in receiver stored channel memory, these parameters are simultaneously stored in the exciter's memory at the same channel.
If the exciter is selected, the TX LED will be lit and the transmitter frequency displayed. Channel Data Save operations made in TX result in storage in the exciter memory only.
The following examples illustrate how easy it is to set up the receiver/exciter pairs for half duplex operation. When in JOINT CONTROL, the menus for both the exciter and the receiver are available whenever the CHANNEL MODE is entered. This allows the operator to program both radios at one time.
Remember that when RX is selected, all stored parameters are entered into the memories of both the receiver and exciter. If TX is selected, storage occurs in the exciter only. If both radios of a receiver/exciter pair are to be programmed at the same mode and frequency, select RX and program both radios simultaneously. If different frequencies and/or modes are desired, program the receiver first, then switch to TX and program the differences into the exciter memory. The following examples illustrate both configurations:
Example 1: In JOINT CONTROL, program channel 40 of both the exciter and receiver for USB at 12.5 MHz.
a) Use RX/TX menu to select RX.
b) Use CHAN button to enter the CHANNEL MODE and punch in channel 40.
c) Press the FREQbutton and punch in 12.5 MHz, followed by E to enter frequency.
d) Available menus allow programming of both the exciter and receiver channel storage parameters. Use menus to enter USB mode. Also enter AGC,, POWER, FILTER and BFO.
e) Press ENT to exit the channel mode and enter programmed parameters into channel memory. Channel 40 of both the receiver and the exciter has been programmed.
Example 2: Same as example 1, except program exciter for LSB and 13.5 MHz.
a) Follow steps a through e of example 1. Both radios now have same frequency and mode in channel 40.
b) Select RX/TX menu. System will switch from RX to TX.
c) Use CHAN button to re-enter the CHANNEL MODE. Punch in channel 40.
d) Press FREQ, 13.5 MHz and ENT.
e) Use MODE menu to select LSB mode.
f) Press ENT to exit CHANNEL MODE and store channel information. Channel 40 of the exciter only has been modified to the new frequency and mode.
3.6.3 RADIO OPERATION UNDER JOINT CONTROL
The time-saving ease of operation provided by the JOINT CONTROL mode is most evident during actual radio system control. Both radios in the receiver/exciter pair are simultaneously controlled by the RCU, and RCU displays automatically switch between receiver and exciter status when required by the system operator.
Select the JOINT CTL menu and identify the addresses of the receiver and exciter that will be put under JOINT CNTL using the SEL RCVR and SELXCTR menus. Program necessary channels as in 3.6.2. Select a programmed channel and both radios will switch to this new channel. Operate the radios the same as in the basic "single-remote" option, with the exception of the time-saving features described below:
The system is normally operated with the RX/TX indicators set to RX. The frequency displays will show the receiver's frequency and the RCU bargraph meter follows the receiver front panel meter. When the system is keyed, the RX/TX LEDs switch to indicate the TX mode, and receiver audio is muted. The RCU frequency display and bar-graph meter now follow the MSR 6700A exciter. When the system is unkeyed, the RCU displays switch back to the RX mode. If the operator wants to review transmitter status without keying the exciter, the RX/TX menu can also be used to switch the RCU displays over to the exciter.
3.7 MULTI-REMOTE OPERATION
The MSR 6420 can be operated in multi-remote operation where two or more (up to 100) MSR 6420s are used to control a radio or group of radios. This allows a radio system to be controlled and monitored at a number of individual work stations.
To maintain orderly control of the system, one MSR 6420 RCU is designated as the MASTER unit, all others are SLAVE units. The master unit can control the radio system or pass control of the system to any one of the slave units. The master RCU can also take control back at any time. A slave unit, once it has been designated as the controlling unit, may pass control to any other RCU in the system. The slave RCU cannot take control back once it has been passed. Only the master unit can ever take control away from a controlling RCU. The controlling unit operates identically to an MSR 6420 RCU in single-remotel multi-radio systems as described in sections 3.5 and 3.6. All non-controlling RCUS, including the master unit, have no control functions, but monitor the radio system at all times.
3.7.1 MASTER UNIT OPERATION
In any multi-remote system, one MSR 6420 must be designated as the master unit. All other RCUS are designated as "slaves". Internal dip switches are used to configure the RCU as a master or slave unit. See section 2.11 for internal dip switch settings and interconnect wiring diagrams.
The master unit delegates control to a slave unit with the "PASS CTL" menu. When this menu is selected, the RCU prompts the operator to enter the address of a slave RCU with a display of "ENTER REM ADR: **". To pass control to a slave RCU with an address of 20, the operator punches in 20, followed by ENT. System control is now transferred to slave unit 20. The master RCU verifies this with a display of "CTL PASSED TO 20". The master unit now has no control of the radio system. The only menus available at the master unit are DIMMING, which controls only the brightness of the master RCU, and TAKE CTL.
When system control is passed from one slave to another slave RCU, the master RCU's function/ status display will update to indicate which slave is now in control.
While one of the slave units is in control, the master unit monitors the radio system. The channel and frequency of the radio being controlled are displayed, and the master's meter follows the radio's front panel meter. Receiver audio is available at the RCU speaker. When a controlled transmitter is keyed, the master RCU's display changes to indicate exciter status and meter reading.
NOTE
If more than two RCUs are in the system, all RCUs other than the controlling RCU monitor the radio system as described above.
Whenever the TAKE CTL menu is selected at the MASTER RCU, system control immediately reverts back to the master unit.
3.7.2 SLAVE UNIT OPERATION
All RCUs in multi-remote operation other than the single master RCU are SLAVE units. The RCUS are configured as slave units and given a two-digit address by internal dip switches. See section 2.11 for internal dip switch settings and interconnect wiring diagrams.
Until control of the system is passed to a slave RCU, that slave RCU has no system control and no menus are offered. The function/status display indicates this with the words: "SLAVE UNIT". The RCU monitors system control as explained in 3.7.1.
When the slave RCU is selected by the master to take control of the radio system, it operates identically to an RCU in single remote systems as described in 3.5 and 3.6. The selected slave RCU stays in control until the master RCU retakes control of the system or control is passed by the controlling slave RCU to another RCU. Any changes made by a slave RCU while it is in control are retained and transferred back to the master RCU.
3.7.3 OPERATION WHEN CONTROLLING UNIT IS DISABLED
Multi-remote operation makes special allowances for passing (and thereby maintaining) system control if the controlling RCU becomes disabled. The controlling RCU may be inadvertently turned off, or experience a power outage or internal fault. System response depends upon whether the disabled controlling unit is the master unit or one of the slaves.
The function/status display of each slave RCU normally reads "SLAVE UNIT" when the master RCU is in control. If the master unit becomes disabled, it will no longer communicate with the slaves. Their displays will change to "MASTER IS QUIET" and the "TAKE CTL" menu will become available. Any one of the slave RCUS can now use this menu to take control of the system.
As soon as the "TAKE CTL" menu is selected at one of the slave RCUS, system operation returns to normal with that RCU in control. If the master unit then comes back on-line, the slave unit will maintain control until the master RCU operator decides to take system control back. The master RCU display will indicate the address of the slave unit that took control of the system.
When the master RCU has transferred control to a slave unit (slave unit 07, for example), the master's function/status display will read "CTL PASSED TO 07". If slave RCU 07 becomes disabled, the master's display will now alternately between "SLAVE IS QUIET" and "CTL PASSED TO 07". The master RCU operator can see that slave unit 07 is no longer functional and he can then regain system control, or pass it on to a different slave RCU.
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