Brian,
If the test oscillator crystal is at 10 MHz, it *should* be very
attenuated by the 40 meter Low Pass Filter.
The K2 40 meter LPF cutoff is in the range of 8.5 MHz, so it cannot be
expected to pass a 10 MHz signal.
If you have a crystal in the 40 meter band, you could substitute it for
the 10 MHz crystal and try those measurements again.
If you do not have such a crystal, go forward in the Troubleshooting
procedure to Transmit Signal Tracing and try those steps. Do not skip
the oscillator checks - VFO and BFO that are in the Receiver Signal
Tracing part of the tests.
One thing about the Signal Tracing steps - work in the order listed, one
point depends on the one before it being OK.
Once you come to the first step where the output is significantly
(greater than 10%) lower than the Expected value, stop because you have
just found the output side of the failure point - it will be fruitless
to go on to other check points.
73,
Don W3FPR
On 11/3/2013 3:53 PM, Brian Stevens wrote:
Hi,
I've hit a snag during 40m tx alignment in being unable to peak L1/L2 to give more than
about 500mW o/p with the power setting at 2W. I've gone through the troubleshooting
procedure & all checks out ok until I get to the LPF,BPF & T-R switch section
of the shared circuit testing.
Using the 10Mhz crystal oscillator in the manual with 0.14V at the antenna i/p
I get these readings:
LPF o/p @ W1 = 0.004V (expected 0.13V)
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