[Elecraft] Connecting a K2 to a KPA500

[Ariel Jacala]

The KPA500 does not see the K2 Band.  I do not have an RS232 connection just the coaxial cables.  Tapping the key does not do take the KPA out of transmit even though no longer putting out amplification.  

I ran through the menus

KPA500
Firmware is 1.11
SN 825
Radio set to Serial (instead of K3)
Everything else is default

K2
t-r to hold (per the KPA manual)
QSK delay 0.03

Per Lyle's comment - removing the key line enables receive while in operate.

Ariel NY4G
Sent from my iPad

> On Jan 10, 2014, at 8:24 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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