You ought to be able to measure it by simply looking at the audio output
with a scope. Just send some dits and look at how long it takes for the
noise to reappear. You might have to use a noise source, or a low level
carrier at a slightly different frequency.
Of course, with the AGC off and RF gain high enough to detect a weak
signal, things are going to overload. I'd run the test first with a test
signal which does not overload the receiver, and then one equivalent to
a very strong signal. When actually listening to the radio with AGC off,
of course, it is essential to use the audio clipper to prevent hearing
damage. That may or may not affect recovery time.
73,
Scott K9MA
On 1/13/2019 13:53, Don Wilhelm wrote:
Dave,
I am trying to think of how you might test it.
The best I can think of is to listen to both a noise source and an XG3
sending a CW string of dots. Increase the speed of the CW sent by the
XG3 until you can no longer hear the noise source between dits.
Then either calculate the off times for the dits or measure it on an
oscilloscope.
73,
Don W3FPR
On 1/13/2019 2:07 PM, Dave Cole (NK7Z) wrote:
Hi again Scott,
Thank you for your answer, but I am not being clear.
Not during break in, just sitting there in receive... If the radio
is hit with an S9+ signal, how long after the S9+ signal terminates
before the K3 receiver recovers enough to show an weak signal on the
IF... No T/R happening, just sitting there in receive.
You are close to what I am looking for... I am investigating the
possibility of using the K3 as the receiver portion in a homebrew
bistatic radar setup running in the HF spectrum.
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