[Elecraft] [KAT500] Help with KeyLine Interrupt on KPA500 (Video)

[Igor Sokolov]

That may be cure for KPA500 + KAT500 combo but KAT500 supposed to work with 
amps of other manufacturers. My conversation with Elecraft tech support led 
me to believe that some sort of TX delay can be implemented in future 
firmware release.

73, Igor UA9CDC

----- Original Message ----- 
From: "iain macdonnell - N6ML" <ar at dseven.org>
To: "Igor Sokolov" <ua9cdc at gmail.com>
Cc: "Chris Johnson" <elecraft at ozy.us>; <Elecraft at mailman.qth.net>
Sent: Saturday, December 08, 2012 12:31 AM
Subject: Re: [Elecraft] [KAT500] Help with KeyLine Interrupt on KPA500 
(Video)


> It should be noted that the KAT500 does not "regenerate" the PTT
> signal, rather it (only) interrupts it (by opening relay contacts).
> Therefore it can't really delay the initial PTT signal going to the
> amp... it can only interrupt it as fast as it can, when it detects
> high VSWR.
>
> As Gary mentioned, there is newer KPA500 firmware that alleviates the
> problem of hard faults when it detects high VSWR before the KAT500 has
> time to interrupt the keying line, but it appears that that new KPA500
> firmware has not been generally released yet.
>
> 73,
>
>    ~iain / N6ML
>
>
>
>
> On Fri, Dec 7, 2012 at 4:10 AM, Igor Sokolov <ua9cdc at gmail.com> wrote:
>> I think what happens is KAT500 needs few msec to determine the operating
>> frequency and measure SWR. There is currently no delay between PTT going
>> into KAT500 from the radio and PTT going out into the KPA500. These few 
>> msec
>> is enough for KPA500 to switch itself to fault condition.
>> Here programmable PTT delay in KAT500 would be very helpful. Especially 
>> so
>> with other makes of the amplifiers.
>> I have discussed it with Elecraft tech support and they say this feature 
>> is
>> on their to do list. Lets hope that the next firmware revision of KAT500
>> will have that feature implemented.
>>
>> 73, Igor UA9CDC
>>
>> ----- Original Message ----- From: "Chris Johnson" <elecraft at ozy.us>
>> To: <Elecraft at mailman.qth.net>
>> Sent: Friday, December 07, 2012 3:35 PM
>> Subject: [Elecraft] [KAT500] Help with KeyLine Interrupt on KPA500 
>> (Video)
>>
>>
>>
>>> Hi Guys,
>>>
>>> I made a video and posted it on youtube to better explain the issue I'm
>>> having.   Please watch and then reply to it here if you would.
>>>
>>> Much appreciated
>>>
>>> http://www.youtube.com/watch?v=QtCPvKKM3_c
>>>
>>> Chris
>>> K6OZY
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