[KPA500] Reduced band sensitivity when in OPER

[Ozy]

I just noticed that if I flip my KPA500 into OPER, the band sensitivity drops by a huge amount.  I have a KAT500 between it and my rig.  If I flip it back to STBY, the band reception is back to normal.   The amp still puts out power according to the W2 that is after it.

Any ideas?


______________________________________________________________
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]

[mcduffie]

On Wed, 9 Sep 2015 17:18:33 -0700, Chris Johnson wrote:

> I just noticed that if I flip my KPA500 into OPER, the band sensitivity drops by a huge amount.  I have a KAT500 between it and my rig.  If I flip it back to STBY, the band reception is back to normal.   The amp still puts out power according to the W2 that is after it.

Sounds like a probable bad PIN diode.  You should see minimal change.  I show
one db change in audio level on WSJT on six meters.  Check with E-craft on
troubleshooting the diodes and see what they say.

Gary
______________________________________________________________
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]

[Dwayne Rohmer]

Chris,

You may want to check your coax connections between the rig, KPA500, and
KAT500.

The KPA500 should be between the rig and KPA500 with regard to the RF.

The KAT500 should be between the rig and the KPA500 with regard to the
DB9 cables. This is so that the KAT500 can interrupt the KPA500 under
high SWR conditions.

73,

Dwayne WV5I


On 9/9/2015 7:18 PM, Chris Johnson wrote:
> I have a KAT500 between it and my rig.

______________________________________________________________
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]

[Dwayne Rohmer]

Correction to the previous post

Chris,

You may want to check your coax connections between the rig, KPA500, and
KAT500.

The KPA500 should be between the rig and *K**AT**500* with regard to the RF.

The KAT500 should be between the rig and the KPA500 with regard to the
DB9 cables. This is so that the KAT500 can interrupt the KPA500 under
high SWR conditions.

Sorry for the error.

73,

Dwayne WV5I

On 9/9/2015 7:50 PM, Dwayne Rohmer wrote:

> Chris,
>
> You may want to check your coax connections between the rig, KPA500,
> and KAT500.
>
> The KPA500 should be between the rig and KPA500 with regard to the RF.
>
> The KAT500 should be between the rig and the KPA500 with regard to the
> DB9 cables. This is so that the KAT500 can interrupt the KPA500 under
> high SWR conditions.
>
> 73,
>
> Dwayne WV5I
>
>
> On 9/9/2015 7:18 PM, Chris Johnson wrote:
>> I have a KAT500 between it and my rig.
>

______________________________________________________________
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]

[Ozy]

Hmm.  I figured it sounded like something not-good.   The setup hasn’t changed in years, so there isn’t a configuration change in play here.

I’ll give them a call tomorrow unless they pipe in here.

Thx

Chris
K6OZY

> On Sep 9, 2015, at 5:45 PM, [hidden email] wrote:
>
> On Wed, 9 Sep 2015 17:18:33 -0700, Chris Johnson wrote:
>
>> I just noticed that if I flip my KPA500 into OPER, the band sensitivity drops by a huge amount.  I have a KAT500 between it and my rig.  If I flip it back to STBY, the band reception is back to normal.   The amp still puts out power according to the W2 that is after it.
>
> Sounds like a probable bad PIN diode.  You should see minimal change.  I show
> one db change in audio level on WSJT on six meters.  Check with E-craft on
> troubleshooting the diodes and see what they say.
>
> Gary

______________________________________________________________
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]

[Ozy]

OK I just reread my initial email and realized I typoed that wrong.  Obviously I have the KAT500 after the amp.  :)  LOL

> On Sep 9, 2015, at 6:02 PM, Chris Johnson <[hidden email]> wrote:
>
> Hmm.  I figured it sounded like something not-good.   The setup hasn’t changed in years, so there isn’t a configuration change in play here.
>
> I’ll give them a call tomorrow unless they pipe in here.
>
> Thx
>
> Chris
> K6OZY
>
>> On Sep 9, 2015, at 5:45 PM, [hidden email] wrote:
>>
>> On Wed, 9 Sep 2015 17:18:33 -0700, Chris Johnson wrote:
>>
>>> I just noticed that if I flip my KPA500 into OPER, the band sensitivity drops by a huge amount.  I have a KAT500 between it and my rig.  If I flip it back to STBY, the band reception is back to normal.   The amp still puts out power according to the W2 that is after it.
>>
>> Sounds like a probable bad PIN diode.  You should see minimal change.  I show
>> one db change in audio level on WSJT on six meters.  Check with E-craft on
>> troubleshooting the diodes and see what they say.
>>
>> Gary
>
> ______________________________________________________________
> 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]

______________________________________________________________
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]