Re: LF: Software to time swap 2 RX antennas over?

[Andy Talbot <andy.g4jnt@gmail.com>]

Hw about a crystal oscillator and CMOS divider.   You may have to juggle with division ratio a bit depending on what chips and crystals are available.  Then just manually reset it on the even minute and allow to free run.   It'll be accurate enough for a day or two.

I'd use a PIC,  many others an Arduino - why complicate it with a PC and yet another interface line

Andy

www.g4jnt.com

On Fri, 22 Mar 2019 at 20:30, Chris Wilson <dead.fets@gmail.com> wrote:

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