[Skimmertalk] Cheap Skimmer 24/7 ANT Switch; ANT cutoff hang timer for skimmer radios
H Lawrence Serra
hlserra at sbcglobal.net
Tue Dec 20 13:58:33 PST 2011
Some respondents have mentioned the possibility of switching skimmer ANTs for
low and high bands. Attached is an article I wrote for NCJ about using a cheap
lamp timer and an old Dow-Key 110vac relay to switch ANTs for day and night
Also attached is a schematic for an ANT cutoff hang timer that I had built to
cutoff and ground the ANT input at the SDR-IQ and RA6790 radios when I am keying
QSK CW. On key down the normally open contacts on the xmtr close, cutoff occurs
immediately and "hangs" for the adjustable period of time, protecting the radios
from high RF levels, as my ANTs are very close together.
I thought these might be useful to some of your skimmers.
73, Larry N6NC
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