Re: I think I need channel filters

John Rumm wrote:
Glenn Millar wrote:

Running a variable gain amplifier at lowest gain will only increase the noise level. A fixed low gain amplifier would be better suited. Having

The spec on that amp show a max noise of 2.6dB and a minimum gain of supposedly 7dB, so that ought to have had some positive benefit. However the min gain setting was really used just to overcome the initial download loss and see if the dist amp could do its stuff from there.

the actual input levels to the masthead amplifier from the aerial would make it easier to advise you.

Just as well I have not taken the ladders down yet (although you just incurred the wrath of SWMBO for interrupting the tennis!)

Channel @Aerial +mast amp +mast amp
min gain max gain
39 53 56 73
48 53 57 72
49 54 59 74
50 53 56 71
54 51 55 68
56 51 55 68

Analogue bbc1 & 2 :

44 72 77 94
51 75 82 >=99

(I note the gain is a bit lower than spec at both ends - but that could be down to the fact I was powering the amp from my test meter and the batteries were getting low)



I personally wouldn't be fitting a masthead amplifier. A good quality distribution amplifier with moderate gain at most, Proception 8way 5dB gain for example. You don't want signals on analogue at the TV to be higher than 80 or digital above 60.

Your problem seems to be too much signal instead of too little.
.

Quantcast