[Elecraft] Connecting a K2 to a KPA500

[Ariel Jacala]

Jack

The problem appears to be in the keying interface.  Disconnecting the keying cable enables receive while in operate - per Lyle's comment.

Ariel NY4G

Sent from my iPad

> On Jan 10, 2014, at 8:49 PM, "Jack Brindle" <jackbrindle at me.com> wrote:
> 
> You may want to talk to tech support when they open on Monday. You can connect the KPA to the K2 using a serial cable, but be sure to follow the K2 rules and only connect pins 2, 3 and 5. DO NOT connect the other pins on the KPA -0 that is, do not use a straight-through 9 conductor cable. Set the KPA’s RADIO menu setting to SERIAL and the data rate to 4800.
> 
> This won’t solve the receive problem, though. The problem sounds serious enough that Customer Support will need to help you.
> 
> Jack Brindle, W6FB
> 
>> On Jan 10, 2014, at 5:24 PM, Cady, Fred <fcady at ece.montana.edu> wrote:
>> 
>> Hello Ariel,
>> Does the KPA500 show the same band that the K2 is on?  If not, try tapping your key to send a little RF to the amp when in operate mode so it can measure the frequency and switch in the correct band pass filters.
>> Cheers,
>> Fred KE7X
>> "The Elecraft K3: Design, Configuration, and Operation, 2nd Ed"
>> "The Elecraft KX3 -- Going for the Summit"
>> Coming soon: "The Elecraft KPA500 and KAT500"
>> 
>> -----Original Message-----
>> From: elecraft-bounces at mailman.qth.net [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Ariel Jacala
>> Sent: Friday, January 10, 2014 5:24 PM
>> To: elecraft reflector
>> Subject: [Elecraft] Connecting a K2 to a KPA500
>> 
>> Hi to the Elecraft Reflector
>> 
>> I just acquired a KPA500 and connected it to a K2.  I  have the output of the K2 connected to the input of the KPA500.  Things checked out through a dummy load in terms of loading the amplifier.  The KPA500 is then connected to a resonant antenna.  When on standby, I can hear signals through the antenna.  When I press operate - I can no longer hear the signals.
>> 
>> When I press the tune button on standby, the KPA500 does not measure  SWR.  Is this normal?  The KPA500 was previously operated with a K3 with the K3 cable to the KPA500.  I can key the KPA500 with the K2 and it produces expected power with the recommended drive levels.  I am worried about not hearing signals when in operate mode.
>> 
>> Do I need to update the firmware?  Why can't I hear signals from the antenna with the KPA500 in "operate"?  
>> 
>> Any help is appreciated.  
>> 
>> Thanks 
>> 
>> Ariel NY4G
>> 
>> Sent from my iPad
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