Hi all,
KAT500 + KPA500 connected to K3 through coax and elecraft
interfacecables. NO antenna connected to KAT500 (all 3 connectors open)
KAT500 and K3 connected to same DC-supply.
KPA500 off (AC cord disconnected)
Results:
KAT500 switched on, Mode = auto, ANT = 1, no antenna connected: *S4
birdie on 28004.5 kHz* measured by K3
test 1:
- Changing ANT connector on K3: birdie gone.
- Change antennaconnected on K3 back: birdie S4 again
- Change to other antennaconnectors on KAT500 makes very little
difference: <0.3dB Measured on dBV meter of K3 with AGC off
- Disconnecting the elecraft interface cables makes NO difference. Keep
them disconnected for further tests.
test 2:
- Switch off KAT500 (hold mode switch): birdie drops <0.5dB
- Disconnect DC from KAT500: birdie is gone. (proof that is has to do
with the KAT500)
test 3:
- KAT500 switched on again
- Connect dummyload on ANT 1 of KAT500 with KAT500 on: birdielevel goes
UP +2dB (as compared to no dummyload connected in tests 1 and 2).
S-meter now now has gone up to S5.
- then switch off KAT500: birdielevel drops DOWN -10.5dB
- switch off KAT500: birdie gone
Can anyone reproduce this?
I have not checked all other frequencies, so this might be the only one.
Still this is a birdie that I cannot ignore.
73
Arie PA3A
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