Until recently I was using Logitech cordless devices (mouse/trackball &
keyboard) near a 1500 watt amp. Antenna was a dipole about 50 feet up and
100 feet from keyboard. I had some trouble on ten meters, but none on other
bands. I just checked the logitech page
(http://www.logitech.com/cf/support/1029.cfm) and found that most of the
devices are running at 27 Mhz - might explain the 10m problem.
Keith Regli WB6BIG
mailto:keith@kregli.com
http://www.kregli.com
-----Original Message-----
From: writelog-admin@contesting.com
[mailto:writelog-admin@contesting.com]On Behalf Of Joe Dubeck
Sent: Saturday, December 29, 2001 9:36 PM
To: ARS NZ3O (Byron) FM29fx
Cc: writelog@contesting.com
Subject: Re: [WriteLog] Touchpad, Mouse, or Trackball?
Byron-
Good question. I had never before thought of that since it has always
worked.
The beams that handle the 1500 watts (10 - 40 meters) are at 121' and 135'
high on a tower about 250' from the shack and mouse. I also have 125
watts on 220 80' up on same tower.
I have another antenna.about 25 feet away and up 20 feet but that never
sees over 100 watts . . . on 10 - 30 meters.
Finally I was testing a poorly tuned walk-about antenna QRP at 3 watts with
that antenna about two feet away. I mention this because that QRP setup
will ring a GE telephone 4 feet away but it didn't effect the mouse.
I don't know what frequency the mouse uses but I just ran 5 watts on an
HT, 2 meters, with the rubber duck 4" from the mouse receiver with no
effect. Then I tried the same thing on 440 and temporarily, the trackball
wouldn't move the cursor until I moved the rubber duck out to around six
inches away from the mouse receiver. That had to be an extreme case of
front end overload.
At 10:58 PM 12/29/2001 -0500, you wrote:
>Joe:
>
>How far is your mouse from your antenna? I had not
>considered one of these because of RF concerns,
>since my antenna is at 15 meters and 25 meters from
>the mouse.
>
>73, Byron
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