To: | [email protected] |
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Subject: | Re: LF: RE: Todmorden receiver |
From: | Paul Nicholson <[email protected]> |
Date: | Wed, 29 Nov 2017 17:11:48 +0000 |
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The re-built E-field rx was put outside this afternoon for a on-air trial. Pre-amp inside the antenna tube http://abelian.org/vlf/tmp/171129a.jpg I'm a bit worried about noise from light getting into the tube - the plastic lets a bit of light through. I'll probably have to fit an opaque liner. Here's the power supply, filter and line driver http://abelian.org/vlf/tmp/171129c.jpg I just got finished at dusk http://abelian.org/vlf/tmp/171129d.jpg The antenna looks remote but there's still 140mV RMS of 50Hz on it. This doesn't come from the house, or even the overhead power lines to the house, but from further away. I'm using a metal support pole and guys - hopefully that means the calibration won't change so much between wet and dry conditions. Here's the spectrum http://abelian.org/vlf/tmp/171129e.gif It seems to be working well, no intermod. The gain is a little too high, overall x30 voltage gain from antenna to soundcard input. I'll have to drop that to about x15 tomorrow. It really doesn't need much gain with a 2m antenna tube 2m off the ground. -- Paul Nicholson -- |
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