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| To: | LF Group <[email protected]> |
|---|---|
| Subject: | LF: Field Strength Meter - advice needed |
| From: | Chris Osborn <[email protected]> |
| Date: | Sun, 3 May 2009 17:13:14 +0000 (GMT) |
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LF, I've just rebuilt PA0SE's field strength meter (LF Experimenters' Handbook), modified for use on the 500 kHz band. I've followed the published circuit as near as possible considering available components, the differences being: a) I have used a small variable capacitor instead of the published varicaps. b) I used a JFET 2N3819 in the front end instead of dual gate mosfets. c) Obviously I now use the MW coil of the ferrite rod instead of the published LW coil. I have made a decent Helmholtz coil which gives a stable magnetic field yet the field strength meter's output voltage is very dependent on temperature and can vary up to 30 %. I would be most grateful for any advice on curing this problem as I've spent hours trying to correct it. 73 Chris G3XIZ |
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