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<div class="moz-cite-prefix">Wow, Henry,<br>
<br>
what a fantastic idea! I will try it, too.<br>
<br>
73, George<br>
dl2kp<br>
<br>
<br>
Am 27.02.2017 um 14:27 schrieb Henry Vredegoor:<br>
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<pre wrap="">***** High Performance Software Defined Radio Discussion List *****
</pre>
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Listening back the Teamspeak recording of 25-FEB-2017, there was a
discussion on listening to/measuring ultrasonic transducers with
OpenHPSDR hardware. (K7SR)<br>
<br>
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)<br>
<br>
Moreover so, I also could "listen to" and "see", <i><u> <font
size="+2">bat's</font></u></i>, 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!<br>
The bat's were around 30 to 50 kHz if I remember correctly.<br>
<br>
So maybe the newer HPSDR hardware isn't capable of listening on
VLF, but my good old Mercury apparently is! ;-)<br>
<br>
73's,<br>
<br>
Henry - PA0HJA<br>
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<pre wrap="">_______________________________________________
HPSDR Discussion List
To post msg: <a class="moz-txt-link-abbreviated" href="mailto:hpsdr@openhpsdr.org">hpsdr@openhpsdr.org</a>
Subscription help: <a class="moz-txt-link-freetext" href="http://lists.openhpsdr.org/listinfo.cgi/hpsdr-openhpsdr.org">http://lists.openhpsdr.org/listinfo.cgi/hpsdr-openhpsdr.org</a>
HPSDR web page: <a class="moz-txt-link-freetext" href="http://openhpsdr.org">http://openhpsdr.org</a>
Archives: <a class="moz-txt-link-freetext" href="http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/">http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/</a></pre>
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