Message-ID: <5C93DC37.6010201@posteo.de>
Date: Thu, 21 Mar 2019 19:47:19 +0100
From: DK7FC <selberdenken@posteo.de>
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3
MIME-Version: 1.0
To: rsgb_lf_group@blacksheep.org
References: <126956515.20190320112712@gmail.com> <5C928276.6030305@posteo.de> <3059038.G59NEj1qbP@x220>
In-Reply-To: <3059038.G59NEj1qbP@x220>
Subject: Re: LF: Software to time swap 2 RX antennas over?
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Sender: owner-rsgb_lf_group@blacksheep.org
Precedence: bulk
Reply-To: rsgb_lf_group@blacksheep.org

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.
>>>        
>
>
>   --
>   ZE-Light e ZE-Pro: servizi zimbra per caselle con dominio email.it, per tutti i dettagli
> Clicca qui http://posta.email.it/caselle-di-posta-z-email-it/?utm_campaign=email_Zimbra_102014=main_footer/f
>
>   Sponsor:
>   Soluzioni di email hosting per tutte le esigenze: dalle caselle gratuite a quelle professionali su piattaforma Zimbra, da quelle su proprio dominio a quelle certificate PEC. Confronta le soluzioni
>   Clicca qui: http://adv.email.it/cgi-bin/foclick.cgi?mid=13326&d=21-3