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From: "Dave G3WCB" <ganymede444@btopenworld.com>
To: <rsgb_lf_group@blacksheep.org>
Date: Tue, 9 Jun 2009 21:47:31 +0100
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Subject: LF: RE: M0BMU small antenna test beacon <report>
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Hi, Jim.

I'm copying your beacon OK here at 20:30z

Measured signal levels (signal path includes a tuned pre-amp) are:-

beacon -63 dBm, -69 dBm, -77 dBm, -83 dBm, and the last dash is below the
noise level of -85 dBm.

The set up is a Mini-Whip on top of a 2.4m portable mast, tuned pre-amp and
SPM-30 with 1740 Hz bandwidth.
Intriguingly, the signal strength is much the same if I use my regular
transmiting 20m long "Tee" antenna at 5m instead of the MiniWhip.

If I turn my ADSL modem back on, the noise level jumps to -73 dBm.

What level of carrier power are you putting into the antenna?

73, Dave G3WCB IO91RM, nr Windsor, S.E England

-----Original Message-----
From: owner-rsgb_lf_group@blacksheep.org
[mailto:owner-rsgb_lf_group@blacksheep.org]On Behalf Of James Moritz
Sent: 09 June 2009 20:48
To: rsgb_lf_group@blacksheep.org
Subject: LF: M0BMU small antenna test beacon


Dear LF Group,

As art of continuing investigations into antennas, grounds, etc., I am
running a beacon at the moment on 503.5kHz - I am testing a small "/P"
antenna similar to what G3CWI proposed to use a couple of weeks back. It is
a 9m high "umbrella" with 4 x 5m long top loading wires sloping at about
45degrees. Ground system is 4 x 20m radial wires.

The beacon is transmitting an 8wpm CW identifier, followed by five 5 second
dashes at reducing power levels in steps of 6dB. The maximum ERP is
somewhere in the region of 100mW ERP. The sequence repeats every 2 mins
roughly.

I'll leave it running until after dark at least - any reports would be very
welcome.

Cheers, Jim Moritz
73 de M0BMU