KPA presents high SWR to rig

[vu2cdp]

Hi all,

Using KPA-500 with an FT 2k. All was well until last weekend when suddenly
the rig shows high SWR when i put the amp in OPER mode. The SWR checks out
fine on the rig's in-built meter when the amp is in STBY mode. But cannot
get the rig to key the amp as the needle on the rig's meter swings wildly
to the right the moment i put the amp in Operate.

I saw a couple of posts in the archives similar to mine but could't find
any solutions from them. Can anyone help in identifying the cause of such
behaviour and the fix?

73,
Deepak VU2CDP
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[Guy Olinger K2AV]

Are you switching in the KPA500 with the transceiver in TX and key down and
power output? That will destroy relay contacts in the KPA500.

73, Guy K2AV

On Friday, July 31, 2015, Deepak VU2CDP <[hidden email]> wrote:

> Hi all,
>
> Using KPA-500 with an FT 2k. All was well until last weekend when suddenly
> the rig shows high SWR when i put the amp in OPER mode. The SWR checks out
> fine on the rig's in-built meter when the amp is in STBY mode. But cannot
> get the rig to key the amp as the needle on the rig's meter swings wildly
> to the right the moment i put the amp in Operate.
>
> I saw a couple of posts in the archives similar to mine but could't find
> any solutions from them. Can anyone help in identifying the cause of such
> behaviour and the fix?
>
> 73,
> Deepak VU2CDP
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email] <javascript:;>
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email] <javascript:;>
>

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[vu2cdp]

Hello Guy,

No, i would never do that!  :-)

A friend told me that it may be the PIN diode, probably blown by static
discharge while swapping antennas. But he wasn't sure. I intend to do some
diagnosis tomorrow afternoon when i should have some free time.

73,
Deepak VU2CDP

PS: this one was put through the grind right after assembly in an
expedition (VU4KV) and has never given any problems until now.

On Fri, Jul 31, 2015 at 11:16 PM, Guy Olinger K2AV <[hidden email]>
wrote:

> Are you switching in the KPA500 with the transceiver in TX and key down
> and power output? That will destroy relay contacts in the KPA500.
>
> 73, Guy K2AV
>
>
> On Friday, July 31, 2015, Deepak VU2CDP <[hidden email]> wrote:
>
>> Hi all,
>>
>> Using KPA-500 with an FT 2k. All was well until last weekend when suddenly
>> the rig shows high SWR when i put the amp in OPER mode. The SWR checks out
>> fine on the rig's in-built meter when the amp is in STBY mode. But cannot
>> get the rig to key the amp as the needle on the rig's meter swings wildly
>> to the right the moment i put the amp in Operate.
>>
>> I saw a couple of posts in the archives similar to mine but could't find
>> any solutions from them. Can anyone help in identifying the cause of such
>> behaviour and the fix?
>>
>> 73,
>> Deepak VU2CDP
>> ______________________________________________________________
>> 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
>> Message delivered to [hidden email]
>>
>
>
> --
> Sent via Gmail Mobile on my iPhone
>

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