Re: Fldigi & Paspberry PI - Pause on Mode Change


Hi Dave,


Thanks – I’ll have to join that group.


I did more experimenting today and think I have discovered

what’s causing it.


I run with a generic usb sound fob.  When I use the signallink,

I do not have the delay.


I found out that if I turn off “Device Supports Full Duplex”, then

the delay disappears.  This corrects it on both of my two

PI’s that are running with the generic USB sound fob.


Not sure why having “Full Duplex” on would cause a delay,

but it is totally repeatable.


Full Duplex on – Delay

Full Duplex Off – No Delay.


I’ll know for sure after next Tuesday night’s digital net.

But I have been testing it for several hours, and with

Duplex Off, everything work fine.





Smithville, NJ






From: [] On Behalf Of Dave
Sent: Tuesday, September 24, 2019 9:32 PM
Subject: Re: [nbems] Fldigi & Paspberry PI - Pause on Mode Change



You need to join  You will find many Pi3 / fldigi users there.  Someone will most like have a nearly identical setup.  What transceiver and how interfaced to fldigi?


On 9/24/19 5:03 PM, Bill wrote:

I am going to reply to my message to bump it to top again.

Is anyone here running fldigi on the Raspberry PI?

If so, have you noticed a pause (almost like the program has frozen)
when a mode change occurs?  Doesn't happen every time, but often
enough that I will miss the fldigi message.  The pause i about 5 seconds long
and then the program continues normally.

I have compiled many versions of fldigi, including the latest alpha versions.
It happens on all versions I have tried.

I also have compiled it on the new Raspberry PI 4, 2GB & 4GB, and it
also happens.

Under normal use, most people wouldn't notice this since most qso's are
not doing a lot of mode switching.

I participate on a weekly  Digital Education net which is over a repeater.
During the net, we experiment with a lot of modes, thus the mode change
is occurring a lot during the net.

Is anyone here using the PI and could you please experiment with it
and see if you experience the same pause?


Smithville, NJ


Join to automatically receive all group messages.