When I'm running with the K3, and adjacent QRM starts to move in, I find
that narrowing the passband is often very effective, sometime just going
from 400 to 350 Hz. I expect this is the same with all DSP radios. Alas,
this only works if the adjacent signal is clean.
73,
Scott K9MA
On 12/18/2021 4:57 PM, Mark - N5OT wrote:
Hey Pete,
When a contester says "problems seem to come from QRM" it could mean a
lot of things. Are you talking about adjacent signals, like the next
station up who's CQing, or perhaps when you are coexisting with that
station just fine, but someone answers their CQ who is loud and a
little too close to your side of him? Can you be more specifc?
The responses about wetware separating signals are all fine and good
(K0HB, K9YC et al) but to your filters a 100Hz difference is 100Hz
regardless of the actual frequency of the tone. However, they are
correct that two low pitches a certain number of Hz apart are
absolutely easier to differentiate by ear than two high pitches the
same number of Hz apart.
But not sure that is germane until you describe your frustration in
greater detail. QRM = loud signals, which in a K-3 could bring an
interesting AGC conversation in addition to offset, shift and width.
Separating a desired weak CW signal from an undesired loud CW signal
might require more than telling two notes apart.
73 - Mark N5OT
On 12/15/2021 10:56 AM, Pete Smith N4ZR wrote:
I'm curious to know - except maybe on 160 or VHF, most of my
receiving problems in CW contests seem to come from QRM. When I'm
contesting, I find that the only RX controls I use on my K-3 are the
main tuning or (when running) RIT - this despite having DSP control
to shift and narrow my passband. I just go with my 500-Hz filter and
my ears.
So what do you do? What have you found useful - again, not in
weak-signal situations, but in QRM.
73, Pete N4ZR
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Scott K9MA
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