Gordon,
It is doubtful (but possible) that Q6 is bad. Did it overheat when you
powered up? - if it did, you would most likely have seen a wisp of smoke.
How large is the signal at the base of Q6 when you have 800mV P-P on the
collector of Q5?
The base voltage on Q6 is higher than normal, it should be around 1.1
volts. I would suggest you check all components in the base circuit of
Q6 first.
73,
Don W3FPR
On 3/4/2018 2:26 PM, Gordon LaPoint wrote:
I'm building a K2 kit and I have a problem. I'm starting the Alignment
and Test, Part III on page 77-78. I have no rf out. I have followed
the rf through the tx chain and have a good signal at (RF board) Q5
collector (800mv P-P) using a 400Mhz scope. I have a signal on Q6 base,
but nothing on the collector. The DC voltage (in TX) at Q6 is 12.0
Collector, 1.8VDC base and 0 on emitter. I don't see anything wrong DC
wise, is it likley that Q6 is bad? What else should I look for? With
the radio off the R at Q6 emitter to ground is 1.8ohms, that looks
normal, so I don't have any current flow in Q6, it looks like.
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