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Re: Testing a new board PA

 

Could be due to any or many of the following reasons:

1: Low audio drive - very likely (I use an amped Motorola mic and it goes up to 10W)

2: Low VFO or BFO levels

3: BFO frequency may need tweaking to suit the filter or your voice.

4: Low BiDi amp stage gain - unlikely

5: Low gain in final RF amp stages - short out R131 and see

Considering you get 5W it is not really low as you think!

Cheers
Raj

At 19/06/2017, you wrote:
HI All,

My original BITX never "aligned" correctly. In order to get the 1 amp current draw when hallooo'ing into the mic I had to crank R136 all the way. In that way I could get 5 watts out but only if running higher PA voltages.

xxx snip xxx

Thanks!

Jonathan - KK6RPX
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