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From: "Dave G3WCB" <ganymede444@btopenworld.com>
To: <rsgb_lf_group@blacksheep.org>
Date: Wed, 30 Jan 2008 22:05:30 -0000
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Subject: LF: [500]: First night on 600m
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Dear Rik,

Thanks for the QSO last night. Your signals are consistently stronger this
evening, and you seem to have stirred up quite a lot of activity on 500! The
band sounds more like 80 metres at the moment!

Stations heard in the last hour or so:- GI4PDN 569, G3DXZ 559, OR7T 569/QSB,
GW4HXO 549/deep QSB, G3ZWH 579, M0KHW 589 (new one for me,) G0MRF beacon.

Great stuff!

73, Dave G3WCB IO91RM

-----Original Message-----
From: owner-rsgb_lf_group@blacksheep.org
[mailto:owner-rsgb_lf_group@blacksheep.org]On Behalf Of Rik Strobbe
Sent: 30 January 2008 08:31
To: rsgb_lf_group@blacksheep.org
Subject: LF: First night on 600m


Dear all,

a short overview of my first night on 600m:
- 4 stations worked: G3AQC, GM4SLV (1100km), G3ZWH and G3WCB in that order
- reception reports from OH (OH1LSQ, 1680km), SM, DL, SP, OK, PA
- heard but not worked: DI2AM (599) and SM6BHZ (599+)

As the UK NoV's might expire by the end of February I tried to get
QRV asap, with a very "experimental" and temporary station:
TX: clone of the M0MBU 4MHz VXO design with a modified 136kHz PA. The
PA is causing some trouble, efficiency is lousy (40%) and the FET's
are getting very hot during transmission, so I keep the TX periods
short. Output = 120 W.
Antenna: 9m high / 25m long T-antenna with a part of the loading coil
at the top. Calculated Rrad = 0.3 Ohm. Antenna current is 1.4 A, so
theoretical ERP should be about 0.6 W. But due to the many trees
close to the antenna (some only about 2m) I guess that my real ERP is
far less, maybe 0.3 W.
Based on 120 W / 1.4 A the loss resistance is about 60 Ohm
Antenna tuning and variometer are in open air, so for no no operation
when it is raining.

I will try to be QRV with this setup during the next weeks (to get
interested UK NoV's one step closer to their DXCC .... ..) and
meanwhile I will try to
- build a proper high efficiency TX (I aim for 400 W)
- improve ground to reduce the losses (I aim for 40 Ohm)
That should improve my signal by about 7 dB (1.5 W ERP).

73, Rik  ON7YD (and OR7T)


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