Date: Wed, 15 Feb 2017 16:15:12 -0330 (NST)
From: jcraig@mun.ca
To: rsgb_lf_group@blacksheep.org
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Subject: Re: VLF: Antenna switching
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Hi VLF,

Thank-you for the interesting reading and congrats on your latest
milestones.

There have been some very modest steps taken on this side of the
pond.  New coils were wound with 12 strands of 0.08mm insulated
copper: 2 pies 170 and 110 mH, combined 487 mH, 234 ohms DC.
The 100m wire at H=3D15m was just tuned and I'm happy to be QRV again
on VLF a month after the licence was renewed.

73
Joe VO1NA

On Wed, 15 Feb 2017, DK7FC wrote:

> Hi Markus,
>
> I know!! And you are not the only one who doesn't like NMEA. I like it=20
> however :-)
> In my opinion, the favoured solution would be to build up a VLF RX system=
 in=20
> a quiet location nr N=C3=BCrnberg! :-)
>
> 73, Stefan
>
> PS: There was a bug in the script, now solved.
>
> Am 15.02.2017 18:45, schrieb Markus Vester:
>> Hmmm Stefan, if unannounced transmissions can buy me precious East-West=
=20
>> antenna time, I guess I should revert to surprise operations as well ;-)=
)=20
>> In my opinion, the favoured solution would be to kick out NMEA and liste=
n=20
>> on both antennas simultaneously, with only 1pps superimposed on the righ=
t=20
>> channel.
>>=20
>> Best 73,
>> Markus
>>=20
>>=20
>> -----Urspr=C3=BCngliche Mitteilung-----
>> Von: DK7FC <selberdenken@posteo.de>
>> An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
>> Verschickt: Mi, 15. Feb 2017 15:21
>> Betreff: VLF: Antenna switching
>>=20
>> Hello Markus, VLF,
>>=20
>> My antenna switch works now. I wrote a small script (just my level of
>> skills, while loops and so on ;-) ) that allows tto switch from the
>> north-south loop over to the east-west loop to a certain time and then
>> back to another time.
>> The script is now tested the first time, i switched to EW since 14 UTC
>> and will be back on NS at 16 UTC. You can see the difference at
>> http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber2.html
>> So, Markus, if you want to try a short EbNaut transmission soon in the
>> morning, just tell me the day before, then i can switch the antenna to
>> you just during the start of your transmission, while i'm still
>> sleeping. And then back into Uwes direction, who prefers unannounced
>> transmissions :-)
>> I als removed the grounding on the relay pin of the unused antenna,
>> which caused a coupling between the loops. Now it all should work well..=
=2E
>>=20
>> It opens new playing fields, e.g. testing an alternative E field antenna
>> on the second input. That will be a better choice for the 970 Hz
>> experiments...
>>=20
>> 73, Stefan
>>=20
>>=20
>
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