[hpsdr] Listening to VLF / ultrasonic signals using OpenHPSDR

[georg Prinz]

Wow, Henry,

what a fantastic idea! I will try it, too.

73, George
dl2kp


Am 27.02.2017 um 14:27 schrieb Henry Vredegoor:
> ***** High Performance Software Defined Radio Discussion List *****
>
>
>
> Listening back the Teamspeak recording of 25-FEB-2017, there was a 
> discussion on listening to/measuring ultrasonic transducers with 
> OpenHPSDR hardware. (K7SR)
>
> For what it's worth, I can report that I was able to listen to the 
> time transmitters MSF (60 kHz, Anthorn England, formerly Rugby) and 
> DCF77 (77.5 kHz, Mainflingen  Germany) using Mercury with quite good 
> results using a very improvised antenna (a 10/11 mtr. GP with abt. 15 
> mtr. of coax cable)
>
> Moreover so, I also could "listen to" and "see", /_bat's_/,  flying 
> around in my backyard with PowerSDR, using an ultrasonic microphone 
> (like those used in earlier TV remote control systems) connected 
> directly via an 50 Ohm coax cable to Mercury , with astonishing 
> results for this "quick and dirty" setup!
> The bat's were around 30 to 50 kHz if I remember correctly.
>
> So maybe the newer HPSDR hardware isn't capable of listening on VLF, 
> but my good old Mercury apparently is! ;-)
>
> 73's,
>
> Henry - PA0HJA
>
>
>
>
>
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