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LF: 325km with the QRPp QRSS30 beacon - report

To: <[email protected]>
Subject: LF: 325km with the QRPp QRSS30 beacon - report
From: "Dave G3WCB." <[email protected]>
Date: Sun, 1 May 2011 21:34:06 +0100
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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  
 
 
-----Original Message-----
From: [email protected] [mailto:[email protected]]On Behalf Of Roger Lapthorn
Sent: 01 May 2011 18:33
To: [email protected]
Subject: Re: LF: Re: 325km with the QRPp QRSS30 beacon

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)

On 1 May 2011, at 18:25, "mal hamilton" <[email protected]> wrote:

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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