[Elecraft] KAT500 producing S4-5-birdie on 28004.5

[Anthony Scandurra]

Arie,

Please see the firmware release notes here:

http://www.elecraft.com/KAT500/kat500_software.htm

73, Tony K4QE


On Sat, Jun 29, 2013 at 7:02 AM, Arie Kleingeld PA3A <pa3a at xs4all.nl> wrote:

> 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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