[Elecraft] K2 #7379 troubleshooting

[Don Wilhelm]

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)
>