Brian,
Are you certain you have nor swapped the collector and emitter voltages
for Q11? Refer to the Schematic Key page for the proper leads - be
certain you are keep the device orientation correct.
Yes, the DC voltages on Q5 seem to be correct, but your prior RF
voltages say that the Q5 stage is not working properly. Check all the
components in the Q5 stage, including T1. Check the leads of T1
carefully. If you can see a circle around any lead, the solder did not
adhere properly due to an improperly tinned lead. If there is evidence
of that condition, you will have to remove T1 and re-tin the leads.
73,
Don W3FPR
On 9/1/2010 10:57 PM, Brian Denley wrote:
> Don:
> The Key Down voltages on Q5 were completely normal:
> E: 0.547 V
> B: 1.274 V
> C: 10.26 (12.0 volt power supply)
>
> I also checked the voltages from D1 through Q11 (page 17 or Appendix
> F) and they are vall OK except that the base voltages from Q6, Q7 and
> Q8 are close to zero when they should read 1.1, 0.6 and 0.6 Volts
> respectively.
>
> It seems Q5 is working OK but how do I know any signal is comping into
> that amplifier?
>
> The only oddity I have run into is that I read the opposite voltages
> for Q11 than the manula states i.e I got:
> E: 1.2 V
> B: 0.6 V
> C: 0
> This was with key down.
> I have stared at the device again and again to see if I am reading it
> backwards but I cannot find my error so far.
>
> Thanks for any help.
> Brian
>
http://home.comcast.net/~b.denley/index.html>
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