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Roger,
Henny, LF.
It's
definitely G3XBM. Here's a screenshot from yesterday to compare with Henny's
capture.. I switched to my tuned loop antenna during the "M" of the first
callsign sequence. The jump in signal strength can easily be
seen.
This
must be a record for 50 uW. Well done Roger and Henny!
73,
Dave G3WCB
Mal
The frequency is precisely the same as measured by G3WCB and the
periodicity (shown on Henny's full screen grab) matches exactly the QRSS30
sequence I was using. Maybe just 3dB more and we'd have full ID of the
callsign which would be great.
73s
Roger G3XBM
Via my 2.4GHz handheld (iPod Touch 4g)
If it was not fully readable how did he know it was
you ?
g3kev
----- Original Message -----
Sent: Sunday, May 01, 2011 6:05
PM
Subject: LF: 325km with the QRPp
QRSS30 beacon
"Because of the extremely low antenna
efficiencies, 136kHz is not a band for low power transmitters" - a quote
from page 67 of "LF Today", the excellent book by G3XDV and
M0BMU.
Henny PA3CPM has sent me a screen shot taken
this morning that shows my signal reaching him in Holland. Just a few dB
more would make quite a difference and make the signal fully readable. I
am very grateful to Henny (and others) for working so hard to find
me.
I continue to be amazed, and really pleased, that something
this simple (2.4W RF, 50uW ERP, QRPp beacon TX and a simple thin wire loop
antenna) can be detected so far away, although I know others have done far
better. Of course, I accept it would not be possible without the
signal processing available to us on the RX end and the skill of those
like Henny winkling out the signal from the noise.
....but maybe
in the next edition of the book, the words should be changed? :-)
73s
Roger G3XBM
--
http://g3xbm-qrp.blogspot.com/
http://www.g3xbm.co.uk
http://www.youtube.com/user/g3xbm
https://sites.google.com/site/sub9khz/
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