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LF: QRPpp on 474KHz

To: [email protected]
Subject: LF: QRPpp on 474KHz
From: g3zjo <[email protected]>
Date: Thu, 31 Jan 2013 15:59:01 +0000
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LF

The change from 500KHz to 472KHz rendered a few mini Xtal controlled TX modules once used on 500 redundant so I have changed them to DDS control.

I have run the 200uW TX again which gave me my first spot on 500kHz in 20009 :-

2009-11-22 00:48 G3ZJO 0.503814 -30 0 IO92ng +17 0.050 M0BMU IO91vr 76 47

Since that first report I have made antenna improvements so assuming no changes at M0BMU these should be reflected in the report from that rig.

2013-01-28 00:50 G3ZJO 0.475790  -18  0 IO92ng +0  0.001 M0BMU  IO91vr 76 47

Last night I ran a different mixer/driver to the same PA still 200uW EIRP with very much the same results.

2013-01-30 00:30 G3ZJO 0.475612   -21  0 IO92ng +0  0.001 M0BMU  IO91vr 76 47

Today I completed the change of my very first test TX into a buffer, this TX could never produce enough signal into my first antenna experiments for a decode. I measured the power into a 50R load it is 10dB down on the above TX so 20uW EIRP. I tried it as the PA.

2013-01-31 14:46 G3ZJO 0.475601    -30  0 IO92ng  +0  0.001 M0BMU IO91vr 76  47

After 4 transmissions (only 8 minutes on air) my best DX is 100Km.

2013-01-31 14:56 G3ZJO 0.475602    -29  0 IO92ng +0  0.001  G3SZS  IO81vv 100 62

If I was calling CQ on the key I estimate 8000 Years before I got any report AT ALL then it would most likely be meaningless 599 :-)

Unfortunately the power levels shown by the WSPR reports are not correct and must be disregarded. Tests will continue at 20 micro Watts EIRP for this evening.

73 Eddie

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