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Totally expected behaviour as the radio is full duplex, so when
you are not using the attenuator, you will see some peaks above
the -10dBm overload level. It certainly does it on the 0dBm
output. The indicators stay active for a while after being
It isn't anything to worry about, you can always set DUO Menu 50
ATT ON TX to "ON" to stop it if you don't mind the additional
clicking of the attenuator relay on PTT.
On 21/11/2019 16:01, David via
Can confirm that the red ADC clip indicator comes up on my SW2
PC display when transmitting on my FDM-DUO. I’ve had my FDM-DUO
for around 4 years, but didn’t notice anything until May, when
I’d hardly used it for 2 years because I’d being using an
Sole rig is now FDM-DUO + ART120.
I’m clearly not very observant, because I didn’t notice
that the PK indicator was also flashing until Jim reported it!
Both indicators are suppressed on transmit if the receive
Attenuator is active. Indicators do not come up on receive
whether or not attenuator active. Short, screened usb leads
in use and all leads have clip on ferrites.
Hi Jim, it's strange that you should post
this message, because I was JUST about to post the
same question! When I transmit (FDM DUO &
DUO-ART), I see the PK light come on and it stays on
for a few seconds after I stop transmitting. No idea