PSN-L Email List Message

Subject: Ham radio interference
From: Thomas Dick dickthomas01@.............
Date: Sat, 20 Feb 2010 11:00:30 -0600

Anyone got some suggestions; experiencing interference while 
transmitting ---
                               my ham radio setup; FT101, FT757 and Icon 207
                               low band filtering, torroids on in power 
and grounds -- ground uses 6 ft copper coated rods 
....                            only about 20 ft from a lake
antennas; vertical for 2 meters at 60 feet, ground plane for ten meters 
at 80 feet, 160 meter, 80-40 inverted V

my seismic epuipment; two 20 sec Lehmans, AS1 with magnetic induction, 
Larry Cochrane Amp, AD converter(in metal cases and grounded outside 
again with a separate 6 rod), 4.5 HZ geophones .. with isolation and 
battery backup.

When I transmit on any band. drifting of the base line display occurs 
and spikes appear. I used to run 400 watts on 29.6 mHz (a repeater) but 
abandoned that after 25 yrs when I couldn't cure this problem. I 
recently put up the 80-40 meter antenna and have a 1:1.2 SWR.... still 
the interference is there! Any suggestions?

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