ATU SWR LED's Dead

[Ron]

I'm a new K2 user, but not the builder of this rig.  It seemed to perform
perfectly for one day, then the ATU's SWR LED's quit while tuning.  I get a
1:1 readout in the K2's LCD, but unlike previous tuning, the ATU's relay's
go through the matching process, as if I had changed band or frequency.

Any thoughts will be appreciated.... 73 Ron
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[Don Wilhelm-4]

Ron,

That would be the result if diodes D1 and/or D2 in the KAT100 were
damaged.  They are easy to replace.  If that does not correct things,
then the KAT100 firmware IC may have a damaged input.

The diodes are properly 1N5711s, but 1N4148s will work if you are
willing to sacrifice a bit of "flatness" with respect to frequency.  
Those diodes can be damaged by static coming in on the antenna - not
only lightning, but wind, rain or snow can generate a high static charge
on some antennas.  The safest thing to do is switch the input to a dummy
load when not in use.

73,
Don W3FPR


On 7/27/2011 4:30 AM, Ron Biron wrote:

> I'm a new K2 user, but not the builder of this rig.  It seemed to perform
> perfectly for one day, then the ATU's SWR LED's quit while tuning.  I get a
> 1:1 readout in the K2's LCD, but unlike previous tuning, the ATU's relay's
> go through the matching process, as if I had changed band or frequency.
>
> Any thoughts will be appreciated.... 73 Ron
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

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