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On the GE MASTR PRO, there are a couple of capacitors you need to remove to get the perfectly audio flat.?? This applies to the MASTR imperial as well.? The caps are C-16 and optionally, C-21.?? Andy On Tue, Oct 25, 2022 at 1:31 PM John <jhaserick84@...> wrote: I agree with you, Bob, that most important of anything is a post limiter filter that will roll off as steeply as practical above 3KHz, with a sharp knee so that below say 2800 is not affected. Seems that the problem usually lies in that the usual analog receiver de-emphasis and transmitter pre-emphasis may match overall, but often have a peak audio pass through around the mid point of 1500 cps with roll off below even at pass through below 400 and above 2200 cps. The worst in our somewhat limited experience was the GE Mastr Pro, and the best flattness, the Kenwood TK8180. I suppose in an ideal setup an audio equilizer is inserted to get flat repeater throughput from say 200-3000 cps and you set the dev pot for the same dev in and out at around 2500 cps instead of 1000 cps, otherwise the dev limiter will clip the higher frequencies starting above maybe 2000 cps on full deviation, including squelch noise, thus making the repeater appear to have a lack of highs, not caused by the roll off in the splatter filter, rather selectively clipping at the higher frequencies. |
