[Elecraft] Multiple KUSB Connects

[David Ahrendts]

Interesting, Jack. K3S to KPA500 to KAT500 and a W2 to MA5B typically 1:1.2. Perfecto!
Connected the just received KUSB-KPA500 cable to the amp and to a USB port on my Apple Thunderbolt 27.5 display running with the MacMini.  
Downloaded KAT500 Utility and checked to see I have current firmware. I did. Saved the config. Left the cable in place.
Did a low power (amp in stand-by/amp in stand-by) 20M tune just to check if the KAT500 needed to adjust. Every red light lit up on the amp. Did not dare engage high power. No red lights on the KAT500 or the W2.
Removed the KUSB cable and all was back to normal.
Has to be RF traveling back through the new cable to the KPA500. Let me duplicate the situation again taking great care to separate the KUSB cable from any coax, and I’ll report back.

David A., KC0XT

 

> On Aug 26, 2015, at 2:46 PM, Jack Brindle <jackbrindle at me.com> wrote:
> 
> I do. No problems here from development through current use, and I put it through worse conditions that just about anyone when testing.
> It sound like you are having problems with RFI getting into the KUSB or rather the KUSB-KPA500 cable. Tell me more about how you have things
> connected in your shack, being specific for the computer to KPA connection.
> 
> Jack Brindle, W6FB
> Elecraft Engineering
> 
>> On Aug 26, 2015, at 1:09 PM, David Ahrendts <davidahrendts at me.com> wrote:
>> 
>> Just took delivery of the KUSB for the KPA500. Discovered I am up to speed on FW and saved the config. Left the KUSB connected. Did a 30W K3S tune up and EVERY RED LIGHT on the KPA500 came on. Awesome experience. Sorta like LA’s notorious 405 most nights! Checked everything. Did a quick 30W tune transmission again. KAT500 says 1:1.2 or less. W2, the same. RED LIGHT city again on the KPA500. Removed the cable and we return to sweet green all around. 
>> So: ya don’t operate the KPA500 with the KUSB attached, right?  
>> 
>> David Ahrendts   davidahrendts at me.com   
>> 
>> 
>> 
>> 
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Elecraft at mailman.qth.net
>> 
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> Message delivered to jackbrindle at me.com
> 




David Ahrendts   davidahrendts at me.com