c-밴드 옵셋용 스칼라링 자작하는법.

[제네시스]

자작하는데 참고가 되지 않을까 해서 사진 올려 봅니다.

76cm 옵셋 안테나에 자작한 스칼라링으로 C-band 수신 성공 했다고 합니다.

다음은 제작 과정인데요.

필요한 물건이  알마늄 테이프, 얇은 알미늄 쉬트, 콤파스, 가위 입니다. 

Small- 90mm inside circle diameter, 140mm outside
Medium- 90mm inside circle diameter, 200mm outside
Large- 90mm inside circle diameter, 260mm outside

서클 지름 이구요 LNB 부착 간격은 15mm 라고 합니다.

해석이 필요 합니다.

First off want to personally thank you for initiating this great thread. As to calculation for FD, and the like, YES! Did a great deal of research and there were tons of calculations to consider before drafting a general design. After that did a lot of trial and error testing.

I had plenty of free sheets of 6 mil printing plates so took the original design specs and tweaked the specs both ways from center. Cut out and tested roughly 12 different patterns. Came up with a pattern that worked best and was just slightly off the specified pattern drawn up from the design calculations. However I believe the final design will work great for almost all offset dishes. I will post the actual specs for the home made scaler later in the week as I haven't access to my notes for the project.

Also tried different things:

1. Attach only one ring, makes no differnce if it is the small medium or large ring and mount at very end of the waveguide, quality of 60% signal jumps to 68% and dish is very stable. Moving the dish up/down, right/left and inch doesn't seem to change the signal quality.

2. Mount second ring 10 to 15 mm spacing back of first ring, quality now rises from 60% to roughly 78% and dish is still very stable. Arc alignment for all sats seems spot on. Moving the dish up/down, right/left 1/2 inch doesn't seem to change the signal quality much.

3. Mount all three rings as shown in photo. The 60% quality has now jumped to 94% and dish is now very touchy. Transponders on same satellite may have just a slightly different elevation alignment, and from one satellite to the next the alignment could be just a little bit off. By this I mean you could either set all sats for 85% quality and let go at that or you could using a fixed point dish increase signal to 94%. Also moving the dish 1/2 inch up/down, right/left moves quality from 94% to 0%.

This acts much like the invacom qph-031 does for KU band on a 1 meter dish. Also in reference to the C/KU balance of the BSC621 lnb. Sad to say the C-Band portion works great, but the KU portion leaves somewhat to be desired. As a comparsion, speaking same ********** transponder and dish setup, the Invacom QPH-031 may pick up quality of 94% where the BSC621 KU lnb generates 85% quality. Roughly 10% lower on hot transponders and 5 to 8% reduction on weaker transponders.

As you can see I have a great deal of information yet to share, tons of it actually. Once I have all my test notes in front of me then maybe I can put forth a corordinated effort to release as much

참고로 아래 물품은 일본에서 파는 중국산 기성품입니다.

여기 사진관에 한 2년전에 옥션에서 구매하셨다는 사진을 보았는데요 잘 사용 하고 계신지 잘 모르 겠습니다. 

혹시 예전에 올라온 내용이면 지적 바랍니다. 카페 축적 된자료가 많아 다 확인 하기가 힘들어서요.   

[hisaka]

좋은 정보 감사합니다

[이장]

한번 만들어 보고싶은 충동이 입니다.

[캡틴]

간단한 재료로 만들수 있을것 같네요,,

[제네시스]

모두들 커다란 옵셋있으시니 잘안잡히는 C 밴드 한번 해보시죠. 음 수도권에서 가장 신호가 센 C밴드는 무엇 입니까?

[shane]

좋은정보 고맙네여... 테스트해봐야겟네여...75옵셋뿐이라 C밴드 포기햇는데... 한번 잡아봐야겟어여