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441 posts

Ultimate Geek
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Topic # 86629 10-Jul-2011 18:34
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I am looking for two Terrestrial/Satellite Diplexers (one each end). There are a few on trademe and freeviewshop but they have differing frequency specs. Are they all suitable for NZ frequencies? 

The freeviewshop one says 5MHz - 2450MHz 4db loss aprox $15
This CAE-103AUV says  40Mhz - 2300MHz 3db loss $5.25
GECEN CG02-01 says Ant 5-850MHz, Sat  950-2150 3db loss MHz $10

Also, these have between 3 & 4 db insertion loss. What effect is a total 8db loss going to have on satellite reception? I have a 90cm dish with about a 40m RG6 coax run. My Topfield TF6000 has around 73% signal strength for freeview and 68% for SBS. Not sure what db level this represents.

Regards Allen. 

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546 posts

Ultimate Geek
+1 received by user: 13


  Reply # 491799 10-Jul-2011 22:52

The satellite signal is already amplified by the lnb in the dish and converted to l-band frequencies. The quality of satellite reception is all about signal to noise ratios and this happens in the dish itself. The insertion loss in the diplexers really doesn't affect the quality until you start to get to very low levels. You won't notice 8dB of insertion loss in quality on the decoder.




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