Posted by
Mike Harris-9 on
Mar 01, 2006; 11:02pm
URL: http://elecraft.85.s1.nabble.com/Coax-Switch-between-two-rigs-tp387104p387120.html
G'day,
| There is a neat way to check whether you are going to experience a
dangerous
| amount of RF pickup. If you can find a Radio Shack that still has and
can
| find hobbyist parts, look for their "grain of wheat" miniature
incandescent
| bulbs. They have some that are rated at 6v/25ma etc, but you want the
one
| rated at 1.5V/25ma. Solder it to a coax connector and screw it into an
| unoccupied port on your switch. Crank up your tx/amp to the max power
you
| are going to use and key the TX. Watch the bulb. If you see nothing
from
| the lamp, you are ok. If you see a dull glow, be worried about just how
| consistent your switch is (I have an Alpha Delta--which I use now only
for
| beverage switching) which shows variable performance, the reason for
which
| is apparent if you open it up and look at the guts).
The Yaesu FT-101 had a lamp in series with the RX side of the TX/RX change
over relay. When I was in the Antarctic ('74 - '76) and running traffic
on the main station (1.5kW) it was not unusual to see the lamp flashing
along with the CW or SSB if I left the antenna on the '101. Never hurt
it.
Regards,
Mike VP8NO
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