Date: Fri, 22 Mar 2019 20:05:21 +0000
From: Chris Wilson <dead.fets@gmail.com>
Message-ID: <1911079270.20190322200521@gmail.com>
To: Claudio Pozzi <rsgb_lf_group@blacksheep.org>
In-Reply-To: <3059038.G59NEj1qbP@x220>
References: <126956515.20190320112712@gmail.com> <5C928276.6030305@posteo.de> <3059038.G59NEj1qbP@x220>
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Subject: Re: LF: Software to time swap 2 RX antennas over?
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Hello Claudio and all who have replied here and by e-mail.

I am liking the Spectrum Labs idea, but SL is a daunting application,
but I am sure using it in his simple manner can't be *THAT* hard :)
I'll give it a try, it's an app I really should get to grips with
anyway. Many thanks everyone.

Thursday, March 21, 2019, 5:45:24 PM, you wrote:

> 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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-- 
Best regards,
 Chris                            mailto:dead.fets@gmail.com