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Um, er, it might right there staring him in his face, among all
the odd settings. He's about 4 kHz off calibration; his audio is
muted so of course he will hear nothing; he has gain set to
maximum and video gain set to -30; he is set to full duplex (try
simplex, make it work, then try duplex if needed); TX side has
gains maxed out (overload can produce odd effects); RF bandwidth
is a tad small for WX broadcasts; and I lost interest looking for
more. (I have noticed that out of a fairly narrow band of Visual
Gain settings the radio will blank. That suggests me Video Gain is
not really only a gain for the spectrum related displays.
He should try 12 kHz bandwidth. It will sound better. (He should
NEVER try to transmit on that frequency. Never Never Never. I hope
he didn't try it.) NOAA broadcasts are a wide NFM rather than the
narrower deviation hams and many other services use. Channels are
Is his antenna connected to RX or TX side? Is he set to use
Pluto's AGC? (I don't trust it. Is there a strong signal out of
his display range that is suppressing Pluto's gain?)
Is he set to NFM?
Simon, you might do some good to place current mode and IF
bandwidth down in the status bar.
On 20220524 12:19:19, Simon Brown
I see the audio’s muted. Try a broadcast station using BFM –
88 to 108MHz, start with a greater bandwidth.
There is a very strong National Weather
Service transmitter 7.5 miles from me on 162.500 - not even
For goodness sake – screenshots! Show
us what you’re doing, need to see the radio part of the
Well I decided to update the Pluto
firmware to 0.34 - now I am not receiving anything in
SDR Console on the Pluto - for comparison I connected a
RTLSDR and it's working fine.
BTW, the original issue was with TX
audio from the Pluto being garbled - RX audio was always
fine. Also when I send the tone it was always fine on
the other radio, I was monitoring both it on.
Advice on how to proceed?
– first time I’ve seen this, I know it exists but
you’re the first I’ve encountered using it.
- On the
top right of your screenshot there’s an Auto button
– press it see we can see the waterfall better and
know what you’re trying to demodulate.
offset tuning – don’t have the signal you want to
demodulate in the center of the display, there may
be a spur there (I think this is the case).
- In the
Receive panel on the left:
- Close the audio display
window – not needed (click the button next to the
audio level a few times).
- Scroll down so we can
see the Radio settings, I expect this is the
problem, gains need adjusting.
find the problem!
I’ve attached a screenshot of a
Pluto rev B – you see the Radio panel on the left and
Transmit spectrum on the right.
A complete and unedited
Screen shot using the
screenshot tool will be most beneficial
for us to help you.
Especially taken when
it is acting up. There’s an important bar graph
meter in the lower ribbon bar that will probably
leave us to some conclusion.
73 Kriss KA1GJU
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