Alan,
Finally got into the Jeep. I live in a noisy urban ditch.
I too run the squelch at 5 to silence the noise. I use this setting any time I
am not contesting.
I always have a light blue green trace on the waterfall at the freq I am tuned
into. It just barely stronger than the noise I see across the band scope.
Squelch is never broken when set to 5 unless there is a real signal present.
No Birdie on the 991A at 147.456 with squelch at 5. Moving squelch to 4 it's
just noise like any other freq without a real signal.
73
John
KM4KMU
On Wednesday, February 26, 2020 Alan Larson <wa6azp@gmail.com> wrote:
Has anyone used the FT-991 for FM contesting, particularly on 2 meters?
I have been seeing some annoying behavior with it.
The squelch has an initial setting of 5, which quiets the receiver on 28,
50, and 430 MHz bands. On 144 MHz, there are bursts of noise as the
squelch opens for a fraction of a second every 10-20 seconds, the interval
varies a lot. This is seen with a dummy load connected to the antenna
connector, so it is not signals being received.
I sent the rig to Yaesu for repair, and they reported that no problem was
found, that I should just turn the squelch up higher. Settings or 15 to 20
seem necessary on 144 MHz to minimize the noise bursts. Since my goal
would be to hear the weak signals, I don't want to turn the squelch up
higher than necessary.
Also, I have found various birdies in the receiver on VHF bands, a
particularly strong one was near 147.456, which could be received on a
second receiver near the 991.
Do others see similar issues? This radio is fairly early, so it would be
interesting to know if the FT-991a has similar problems.
I have a video of some of this, if any are interested, I will look at
reducing the size and mailing a copy.
Thanks,
Alan
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