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Re: VLF: Ground loop improvements and test carrier...

To: [email protected]
Subject: Re: VLF: Ground loop improvements and test carrier...
From: DK7FC <[email protected]>
Date: Sat, 06 Apr 2019 14:02:42 +0200
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Hi Paul,

Thanks for your measurements.
Good idea to calculate B relative to I.
Would be interesting to see how this varies with frequency.

BTW i did now actually order one of those:;searl|3512104843 Wonder how long it takes to arrive here, and even more, if it actually has 60 Ah at 60V, i.e. 3.6 kWh!! If so, i will order 3 more of them!...
Considering the 13 dB advantage of night/day in recent transmissions
with that ground loop antenna, at least on 8270 Hz, I'd like to try a
night transmission tonite, at 2970 Hz, trying a 7 character EbNaut
message. So far we have no message decode at ULF between DL and UK. I'd
like to reach that mile stone and think the ERP should be fine now, but
hopefully the QRN stays low enough.
Everyone else is invited to try as well!!!

73, Stefan

Am 05.04.2019 19:06, schrieb Paul Nicholson:
Stefan wrote:

> These were the transmissions today (+ some more parameters):

Received at 5170.1 Hz,

 2019-04-05_10:39,+35m: 1130m, I=2,39 A, 0.63 fT S/N -5.07 dB/1Hz
 2019-04-05_11:19,+51m: 900m, I=2,92 A, 0.63 fT S/N -4.92 dB/1Hz

Yes, the same fT in both tests.  Then we have

  2.74 A -> 0.50 fT,  0.182 fT/A
  2.92 A -> 0.63 fT,  0.216 fT/A

  2.12 A -> 0.50 fT,  0.236 fT/A
  2.39 A -> 0.63 fT,  0.264 fT/A

Nothing received at 970.1 Hz.

Paul Nicholson

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