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[LW] GØMRF 300 watt amp VSWR protection circuit

from [Dexter McIntyre W4DEX] [Permanent Link][Original]
To: LowFer LWCA <[email protected]>, RSGB LF <[email protected]>
Subject: [LW] GØMRF 300 watt amp VSWR protection circuit
From: Dexter McIntyre W4DEX <[email protected]>
Date: Sat, 17 Dec 2005 17:15:00 +0000
Delivery-date: Sat, 17 Dec 2005 17:18:59 +0000
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What is the proper procedure for adjusting the controls of the GØMRF 300 watts LF amplifier VSWR protection circuit? I recently had a FET to fail due to the antenna going off resonance when the loading coil windings received a coat of ice. I had the protection circuit working initially by detuning the antenna and trial and error tweaking the controls. The circuit failed to work because of a poor ground connection at a plated through hole on the control IC. I now seem to have the amp and protection circuit working again but this time would like to adjust the circuit properly. 

Thanks,
Dex, W4DEX / WD2XKO


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