- Kiwi front end protection.
Re: Kiwi front end protection.
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The WebSDR system seems to best address the latency issue of the Kiwi and many other SDRs and thus more popular with ham operators.
The KFS antennas suffer from some switching power supply RFI created by the cell site equipment co-located on one of the HF antenna towers, but still KFS is the premier listening site on the West Coast.
On Sat, Jul 24, 2021 at 10:22 AM Glenn Elmore <n6gn@...
I think it wasn't a Kiwi at the time, just two collocated
antennas with the receiver running continuously. The rx may have
been an analog radio or an Apache/Anan dual-ADC board, I can't
remember any longer, just that I could manage with a receiver
running continuously while I was transmitting. It's possible that
it was the Anan board with some delay.
It's possible to help a Kiwi somewhat by turning down the abuf
but that doesn't solve the problem, it only helps somewhat. I
often run with abuf=0.25. Full QSK with fast CW, or even
listening to one's own signal isn't very useful with any SDR I've
On 7/24/21 9:50 AM, VE3VXO wrote:
On Sat, Jul 24, 2021 at 11:14 AM, Glenn Elmore wrote:
It was rather fun to be 'full QSK' on SSB or CW.
Glenn, how did you deal with the processing delay? Here it is
almost a full second through the Kiwi. I can't handle that, my
fist stops in an instant when my delayed CW hits my ears. Turning
volume knobs up and down on two sets of speakers isn't practical
and is hardly QSK! I thought of using some sort of PTT/mute on the
Kiwi audio but got stalled on that project.
On Kiwi protection, I added an optocoupler output to the green
terminal block which is tied in with my local PTT. The on
resistance of the opto is ~5 ohms so it only gives a little extra
attenuation rather than shorting the antenna directly to ground.
It has handled local 500w transmitter no problem.
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