[Premium-Rx] Longwave Receiver Recommendations?

[Trevor]

Exactly.  That’s why the military uses the SLVR for VLF receiver now.  Of course the antenna system is vitally important.  

There was some discussion about ELF receiver ... I worked as an engineer on that project in the early 80’s.   The receiver was computer based.  So an early SDR.  Rcvr program ran on uyk-44 computer if I recall correctly. About half the size of your home refrigerator.  What a process to boot it up and load program.    The antenna had to be isolated from vibration which is interesting as the modulation was so low in freq (has to be much lower than carrier freq) any vibe would essentially modulate the antenna output and degrade performance.   
Been enjoying the discussion. 

> On Apr 4, 2020, at 07:22, "jrusgrove at comcast.net" <jrusgrove at comcast.net> wrote:
> 
> At the risk of sounding like a 'heretic' ... hands down the best VLF receiver here is a computer sound card as the A/D and Spectrum Laboratory software. One audio channel accepts the incoming VLF spectrum and the other GPS 1 pps and NMEA data. The sound card sampling rate is GPS disciplined by the 1 pps and the 1 pps / NMEA string provides precise time accuracy. Only drawback, of course, is the upper frequency which is limited to 1/2 the sound card sampling rate.
> 
> Jay W1VD
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