-----Original Message-----
From: [email protected] [mailto:[email protected]]On Behalf Of Markus Vester
Sent: 01 April 2012 08:55
To: [email protected]
Subject: Re: ULF: 11.6 µHz transmission

Good morning Wolf, LF,

 

thanks for the hint on the OAM antenna. No, the work of our group is not related to the Navy, and our sub-ground antenna concept is not based on the well known but disputed Bockshorn effect. Our antenna is actually very narrowband and cannot easily be retuned, which so fare has made it difficult to impose any significant modulation on the carrier.

 

However there is a similarity in we are also radiating a circular polarized field - not unlike the former 76 Hz antenna pair in the US.

 

Best 73,

Markus

-----Ursprüngliche Mitteilung-----
Von: wolf_dl4yhf <[email protected]>
An: rsgb_lf_group <[email protected]>
Verschickt: So, 1 Apr 2012 6:52 am
Betreff: Re: ULF: 11.6 µHz transmission

Hello Markus and group,

I will certainly look out for the signal. Only have to modify the soundcard's input coupling capacitor a tiny bit, guess I must connect a second capacitor in parallel. But sure there is something suitable in the junk-box.
Are you, by chance, using a modified OAM antenna for transmission as used by the German Navy near the danish border (see Peter's article). If so, is the inner circle's rotation frequency equal to the transmit frequency ?

Good luck and all the best,
  Wolf .



Am 01.04.2012 08:28, schrieb Markus Vester:

Dear LF,

 

in a joint project including a number of radio amateurs, our group is working on a large experimental earth-antenna system, which is able to radiate an ultra-low frequency signal at low power.

 

We are currently transmitting an unmodulated test carrier on 11.60576 µHz, and (according to our measurements) are achieving a radiated power of 16 microwatts. Frequency stability is on the order of 1e-8, which should enable narrow bandwidth observations with high sensitivity.

 

The transmission has been on air for a while. Any reception reports (especially of far-field detections) would be much appreciated.

 

Best 73,

Markus (DF6NM)

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