I have recently done a full retune (updated satellites.xml and then full automatic scan) on 28.8E following the frequency change of Channel 5HD the other week. The new transponder seems somewhat weaker than the old. I recently fitted a larger Zone2 dish and a new quad LNB and new cabling and spent a lot of time aligning the disk nice and carefully and was pretty pleased with my hour of tweaking. I get an SNR of 96% on BBC transponder (with AGC of 72%) and on ITV it is 86%/71% and on channel4 it is 87%/71%. I don't get any picture breakup any longer (as I did a bit in bad weather previosuly with my old LNB and rusty old Zone1 dish).
until..... I was watching a channel 5 program that I recorded a few days back and there was some breakup. I decided to look closer and noticed that the new transponder was SNR of 73% AGC of 73%. No picture breakup on the live broadcast (at the time I looked) but I investigated further. Here is where it gets very odd......
the new transponder for Channel 5 is meant to be:
11307H 5/6 according to rxtvinfo.com
and according to Lyngsat is is 11306H 2/3
and according to satandpcguy is 11307H 2/3
The tune I did tuned it in as 11306H 2/3
I then (for a laugh) did a manual scan of both 11307H and 11306H 5/6 and 2/3 and all the scans gave the same channels and all with 73%/73% !!
All a bit academic (and a bit confusing for my little brain) but my question is whether, if I have a marginal signal for Channel 5HD 73% then will it make any differerence if I stick with one or the other (11306 / 11307) when I the heavy rain/snow comes down and make the signal even more marginal?
One to ponder.
Paul