PSN-L Email List Message
Subject: Re: Ham radio interference
From: AHrubetz@.......
Date: Sat, 20 Feb 2010 12:18:28 EST
I don't know what your soil type is, but at my lake house I have a
horizontal loop among the pine trees. The soil is sandy, so a ground stake would
offer too much resistance. I ran a ground wire from the feed line balun
at the base of a pine tree out about 40 feet to the lake. Then, I tied a
brick around the end of the ground wire and threw it into the lake. Couldn't
ask for a better ground than that. You might try that to extend your
grounds, and see what happens, since you're only 20' away from the lake.
Al
In a message dated 2/20/2010 11:00:10 A.M. Central Standard Time,
dickthomas01@............. writes:
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?
__________________________________________________________
Public Seismic Network Mailing List (PSN-L)
To leave this list email PSN-L-REQUEST@.............. with
the body of the message (first line only): unsubscribe
See http://www.seismicnet.com/maillist.html for more information.
I don't know what your soil type is, but at my=
lake=20
house I have a horizontal loop among the pine trees. The soil=
is=20
sandy, so a ground stake would offer too much resistance. =
=20
I ran a ground wire from the feed line balun at the base of a pine tr=
ee out=20
about 40 feet to the lake. Then, I tied a brick around the end of th=
e=20
ground wire and threw it into the lake. Couldn't ask for a better gr=
ound=20
than that. You might try that to extend your grounds, and see what=
=20
happens, since you're only 20' away from the lake.=
DIV>
Al
In a message dated 2/20/2010 11:00:10 A.M. Central Standard Time,=20
dickthomas01@............. writes:
Anyone=20
got some suggestions; experiencing interference while
transmitting=
=20
---
&n=
bsp;=20
my ham radio setup; FT101, FT75=
7 and=20
Icon 207
&nbs=
p;=20
low band filtering, torr=
oids=20
on in power
and grounds -- ground uses 6 ft copper coated rods=20
... &n=
bsp;=20
only about 20 ft from a lake
antennas; ve=
rtical=20
for 2 meters at 60 feet, ground plane for ten meters
at 80 feet, 160=
=20
meter, 80-40 inverted V
my seismic epuipment; two 20 sec Lehmans,=
AS1=20
with magnetic induction,
Larry Cochrane Amp, AD converter(in metal=
cases=20
and grounded outside
again with a separate 6 rod), 4.5 HZ geophones=
..=20
with isolation and
battery backup.
When I transmit on any=
band.=20
drifting of the base line display occurs
and spikes appear. I used=
to run=20
400 watts on 29.6 mHz (a repeater) but
abandoned that after 25 yrs=
when I=20
couldn't cure this problem. I
recently put up the 80-40 meter antenn=
a and=20
have a 1:1.2 SWR.... still
the interference is there! Any=20
suggestions?
________________________________________________________=
__
Public=20
Seismic Network Mailing List (PSN-L)
To leave this list email=20
PSN-L-REQUEST@.............. with
the body of the message (first lin=
e=20
only): unsubscribe
See http://www.seismicnet.com/maillist.html for mo=
re=20
information.
[ Top ]
[ Back ]
[ Home Page ]