Hello Claudio,
Don't forget, there are people active on frequencies higher than a
soundcard can sample :-) They need an external receiver and so they
usually have one channel only.
BTW, the RedPitaya could be the solution (i think). Another interesting
Project...
73, Stefan
Am 21.03.2019 18:45, schrieb Claudio Pozzi:
On Wednesday, March 20, 2019 07:12:06 PM you wrote:
Hi Chris,
Use a relay, switched by a FET which is switched by a RS232 line. Then
you can toggle the state by using SpecLab, each 2 minutes automatically,
even at 0x:55, ie.between the sequences, where the TX is off.
For LF you can use a normal relay, it does not need to be a coax relay.
Consider to detune the unused RX antenna, i.e. avoid coupling.
Yes, SpecLab can do the job.
I have compared a loop antenna with the Miniwhip using SpectrumLab and
switching the antennas using a toggle switch, the PC was a laptop with mono
audio input.
The waterfall was very useful to estimate the different noise received by the
antennas.
If the PC have the audio stereo input you can connect one antenna to the left
channel and the other one to the right channel.
See the attached picture.
73 - Claudio ik2pii
73, Stefan
Am 20.03.2019 12:27, schrieb Chris Wilson:
Hello LF'ers,
Looking for ideas re automatically swapping two RX antennas over to
one receiver timed to WSPR or other timed digital modes to compare
performance, Anyone got any input please? Thanks.
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