Don Wilhelm-4 wrote:
Paul,
Rather than trying to do your proposed test, I would suggest you look
carefully at the T/R switch area first. Typical problems are diodes
oriented wrong (check against the Parts Placement diagram in the back of
the manual). A broken lead (or unsoldered,
Paul,
Do you have a sufficient signal level to give you 1.6 volts out of the
AF amplifier?
The impedance of the amplifier's input is considerably higher than the
impedance connected to the output, so the AC voltages may actually be
similar in and out. Can you peg the S-meter with your signal
(if that helps)
Lots of head scratching going on here.
Cheers,
Paul M1PAF
- Original Message -
From: Don Wilhelm w3...@embarqmail.com
To: Paul Fletcher p...@melreed.demon.co.uk
Cc: elecraft@mailman.qth.net
Sent: Thursday, November 26, 2009 12:05 AM
Subject: Re: [Elecraft] [K2] K2 signal tracing
Don Wilhelm-4 wrote:
A drop in signal at the receive output of the LPF could also be caused
by a T/R switch problem.
Update so far. Having terminated the LPF's in a 50 ohm resistor I can
definitely confirm all of the LPF's are fine. I measured swr and monitored
in / out on the scope and
Paul,
Rather than trying to do your proposed test, I would suggest you look
carefully at the T/R switch area first. Typical problems are diodes
oriented wrong (check against the Parts Placement diagram in the back of
the manual). A broken lead (or unsoldered, poorly tinned, etc.) of RFC3
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