[Elecraft] KX3 - KPA100 communication problem

[Bernie Gardner]

Great guessing Dick!

That worked the first try.  I've really got to start playing with 
programming these things so I learn better how they work.

Thanks to Dick and others who have responded!  Things seem to be working 
fine now.

Bernie
W1AZ

On 6/10/2015 8:16 PM, Dick Dievendorff wrote:
> I'm guessing...
>
> Could the amplifier's RS-232 speed somehow have changed?
>
> If you connect the KXPA Utility to the amp, what RS-232 speed does it say
> (at the top of the screen)?
>
> If it's not 38,400 bit/s, you might try changing the speed to 38,400 bit/s.
>
> The command needed to do that, using the KXPA Utility's Command Tester, is
> "^BRP3;" (don't enter the quotes, but do enter the caret ^ and semicolon ;
>
> Then go to the Port tab of the KXPA Utility and click "test communications".
> It should then discover the KXPA100 at 38400 bit/s.
>
> The KXPA100 programming reference is here:
> http://www.elecraft.com/K2_Manual_Download_Page.htm#KXPA100 or
> http://www.elecraft.com/manual/KXPA100%20Amplifier%20Command%20Reference.pdf
>
> The KXPA100 has two RS-232 ports and two RS-232 speeds, one for the Host PC
> side (^BRP command) and another for the KX3 side (^BRX command)).
>
> The KX3 side should always be at 38,400.
>
> The PC side should be at 38400 unless you use a host computer program that
> requires a slower speed.
>
> When you change speeds with the KXPA Utility, you should go to the Port tab
> and click "test communications"; the Utility will then try all the speeds
> and find the one that you've changed to.
>
> 73 de Dick, K6KR
>
>
>
> -----Original Message-----
> From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Bernie
> Gardner
> Sent: Wednesday, June 10, 2015 5:05 PM
> To: elecraft at mailman.qth.net
> Subject: [Elecraft] KX3 - KPA100 communication problem
>
> I have a KX3 with KPA 100 and PX3.  They had worked fine until yesterday
> when communication between the KX3 and my computer through a KUSB failed
> when the KPA100 is on.  The KX3 talks to the computer fine when the
> amplifier is off, but as soon as I turn it on, either through the KX3 PA
> mode setting or with the switch on the amp, the connection to the computer
> fails.  I can communicate with the amp OK.  Also, the connection to the PX3
> isn't lost but the speed drops from 38400 to 19200 with the amp on.  The
> connections between the amp/radio/px3 are per the
> PX3 manual using Elecraft cables.
>
> Thanks for any suggestions.
>
> Bernie
> W1AZ
>
>
>
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