[Elecraft] KAT3 don't tune

[Juha Kasari]

Thank you for information.

If I first tune 1810 kHz then 1820 kHz and so on... It tunes very well 1.0
to 1  rather wide band because impedance is near 50 ohm in 1810 kHz. But, if
I tune first 1870 then 1860.... It doesn't tune very well because first
trying was bad. I think that problem is in software not hardware.

juha - oh6os



2010/11/1 Poul Erik Karlshøj (PKA) <pka at tele.gl>

>
> Hi
> I have the same problem, but with a twist to it. I even got Elecraft to
> send me a replacement KAT3, but it did not help anything.
>
> By chance I tried one of the older configurations (call it config B) and
> then all of a sudden the ATU worked excellent (able to tune a 80m loop and a
> 17m dipole on all bands from 80m thru 10m ... Yes even the dipole!... Both
> antennas use 450 ohm ladder and 4:1 baluns. By the way, now the ATU works
> better than ever before. It never before was able to tune the 17m dipole on
> 30m, 40m or 80m - but now it is!
>
> BUT now with config B something weird happens when the rig is switched ON.
> The TX symbol flashes like in test mode, but there is no audio and the TX
> LED goes on when keyed. I have not found any other way to get out of that
> mode than to make the EE Init reset. Having done the EE Init I can only make
> the rig "see" the KPA3 and the KAT3 by loading a config file.
>
> If I try manually to use CONFIG to select ATU Auto I hear relays clicking,
> when selecting KPA3 I dont hear any fans going in the fan test and leaving
> the KPA3 in norm and leaving the CONFIG it seems that the rig doesn't see
> either KAT3 or KPA3. As soon as I load config B all works again and the ATU
> too ... Until next time I switch ON the rig. Then it needs another EE Init
> and config load.
>
> If I load config A the ATU doesn't work, but now the rig can be switched
> OFF and ON without problems.
>
> I can not see any difference between config A and B and I don't know why
> the rig configuration should influence the functioning of the ATU. Also my
> K2 works fb with its ATU. So the problem is not in the hardware or antenna,
> but something else.
>
> Elecraft is looking into it.
>
> OZ4UN
> Poul-Erik
>
> -----Oprindelig meddelelse-----
> Fra: elecraft-bounces at mailman.qth.net [mailto:
> elecraft-bounces at mailman.qth.net] På vegne af Juha - oh6os
> Sendt: 31. oktober 2010 19:32
> Til: elecraft at mailman.qth.net
> Emne: [Elecraft] KAT3 don't tune
>
>
> Hello,
>
> I have worked CQWW SSB this weekend and noted that kat3 don't tune
> correctly.
>
> Many times after tuning SWR is 1.2 or 1.3 even there is no more swr on
> antenna.
>
> I have dipole on 160 meter and swr is under 3 to1 on band, but kat3 try and
> try long time and leave it 1.8 if at all.
>
> My K2 with KAT100 work correctly with these same antennas.
>
> What is the problem?
>
> juha - oh6os
> K2 #4781
> K3 #2100
> --
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> Sent from the [K3] mailing list archive at Nabble.com.
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