Re: LF: RE: 137kHz QRSS30 beaconing still - reports appreciated

[Roger Lapthorn <rogerlapthorn@gmail.com>]

Dave

That is an excellent screen shot - most impressive! I generate the frequency by dividing a 3.560MHz crystal by 26 and I am unable to measure the frequency very accurately. It should be 137.6748kHz, but this could be off a bit.

Marcus

Next week I shall have a 3.582MHz crystal (30p from GQRP club) which, when divided by 26, will place me around 137.769kHz which is closer to the window looked in by the grabbers.

The beacon produces 2.4W (measured into 50 ohms) and the ERP from the fairly thin wire loop is estimated as around 50uW. My WSPR beacon produces around 3dB more.

73s
Roger G3XBM

On 30 April 2011 14:22, Dave G3WCB. <ganymede444@btopenworld.com> wrote:

Roger, LF,

 

Latest screen grab attached. I switched to my 1.2m tuned loop, and your signal improved by at least 3dB, maybe as much as 6 dB. See attached screenshot.

 

BTW, I make your frequency to be 137676.0. I have a small frequency error which makes signals read high by 0.3 Hz. The line at 137680.40 is a locally generated signal in 137680.0, which is pretty accurate.

 

The line appearing at 137676.8 (137676.5 actual) is a mystery - maybe it's a Loran line.

 

How many watts are you puttting into your loop?

 

73, Dave G3WCB IO91RM

 

 

-----Original Message-----
From: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org]On Behalf Of Roger Lapthorn
Sent: 30 April 2011 12:16
To: rsgb_lf_group@blacksheep.org
Subject: LF: 137kHz QRSS30 beaconing still - reports appreciated

My QRSS30 (slow CW) LF beacon will continue until this evening. Only one report so far G3WCB at 101km.

Message:       XBM in QRSS30, pause, then G3XBM in 10wpm
Freq:             137.6748kHz
ERP:             50uW (antenna 80sq m vertical loop)
Location:       JO02dg, Burwell Cambs

Any reports and screen grabs would be much appreciated.

73s
Roger G3XBM



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