I'm using an AL-80A with an Elecraft K2/100. I recently operated the
RTTY Roundup running about 300-400 watts out.
Intermittently, when the AL-80A would unkey, the received signal
strength would be reduced by 10-30 dB. If I would key the AL-80A
again, even without transmitting (eg just hitting the PTT with a
straight key connected for this purpose), sometimes the receive line
would return to normal, sometimes it would still be attenuated.
A few times, it took 3-8 raps on the straight key to remove the
attenuation. Other times, it just took once.
What causes this sort of intermittent attenuation? What can I do
about it?
Someone earlier mentioned hot-switching of the relay. After
discussing this with the designers of the K2/100, it appears the rig
cannot hot switch - the K2/100 will bring the amp keying line down
about 15-20 ms before it starts producing any RF. Since I was using
VOX keying, there's a longer delay before the rig unkeys.
Bill Coleman, AA4LR, PP-ASEL Mail: aa4lr@arrl.net
Quote: "Not within a thousand years will man ever fly!"
-- Wilbur Wright, 1901
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