Message-ID: <20080130232929.7fv90xzyj1xc0owg@webmail4.kuleuven.be>
Date: Wed, 30 Jan 2008 23:29:29 +0100
From: Rik Strobbe <Rik.Strobbe@fys.kuleuven.be>
To: rsgb_lf_group@blacksheep.org
References: <PAEFLMFGBDKKCONLMLBIOEDNCOAA.ganymede444@btopenworld.com>
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Subject: LF: Second night on 600m
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Hello Dave and all,

yes, good activity tonight.
I worked GI3PDN, G3DXZ, M0KDW, G3XVL and GW4HXO.
4 countries in 2 days ... 96 to go ;-)
Heard: G3AQC, G3ZWH and G0MRF beacon in CW

It had been raining all morning, as I tuned the antenna current was =20
down to 1.3 A (1.4 A yesterday). Wet greenery is more lossy than dry =20
greenery ... I knew that already from 137 kHz.
As I has still 30 minutes daylight I added second earth stake, antenna =20
current went up to 1.55 A. So in dry weather I should have abt 1.7 A.
ERP should be close to 0.5 Watt.

At 22 UTC I disconnected the variometer and loosened the antenna =20
(supported by 2 trees), as WX-prediction gives wind up to 100km/h =20
tomorrow.
I guess I won't be QRV tomorrow. But WX should calm down by Friday and =20
stay so the weekend.

73, Rik  ON7YD - OR7T

Quoting Dave G3WCB <ganymede444@btopenworld.com>:

> 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! T=
he
> band sounds more like 80 metres at the moment!
>
> Stations heard in the last hour or so:- GI4PDN 569, G3DXZ 559, OR7T 569/QS=
B,
> 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 =3D 120 W.
> Antenna: 9m high / 25m long T-antenna with a part of the loading coil
> at the top. Calculated Rrad =3D 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)
>
>
> Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm
>
>
>
>
>
>



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