Robert D. Bowers
It's in receive mode only, and somehow coming from the main
board. It is also volume-dependent - the louder the volume, the
louder the 'ringing' (actually sounding a bit like an echo
chamber). Up to about 1/2 volume, it's not an issue or even
noticeable. Tapping on components didn't narrow it down that much
- somewhere in the middle of the board is about as close as I
I DID pick up a single PSK31 transmission last night - too bad
that mode seems to have largely faded away (at least on 40) - it's
great for 'weak signal' work - especially if you want to ragchew.
If I remember right, PSK31 isn't dependent on which sideband is
being used. I'm using FLDigi for PSK (and may try other modes),
which I think can be set to work with either sideband (worth
I've heard people on the radio, but any attempts to be heard have
mostly been futile (only a couple of partial contacts made). I do
know I'm putting out signal - shows up on a meter. Antenna is a
dipole at 50 ft... works fine with my main radio (an ancient
TS-520). I don't know what the issue is - but only two partial
contacts in hours of trying - that's not good.
The BitX40 is perfect for emergency communications - I've got it in an old movie film case (like tool box) with battery and external DSP noise filter (also provides 20db or more of AVC - still not always enough) and speaker. I think I have enough parts to cobble together a little antenna tuner and SWR meter to fit in the case as well. An easily transportable station in a small (only slightly heavy) box!
On 10/17/19 6:16 AM, Vic WA4THR via Groups.Io wrote:
I have found the BitX40 to be a nice SSB rig and I am curious about your feedback problem. Are you hearing yourself through the speaker when transmitting? What microphone are you using?