On Fri, Dec 7, 2012 at 11:00 AM, hawley, charles j jr
<[email protected]> wrote:
> So with the new firmware the KPA500 would tolerate a high VSWR for a few more
> milliseconds to give the tuner time to interrupt keying?
Yes. It may still kick in the attenuator temporarily, but it shouldn't
hard-fault.
> I was thinking of ways to not send a keying line with the K3 when using
> "tune". But this doesn't seem possible with the K3...I take it the PTT is
> used internally in the K3 or no RF comes out.
> I deal with turning the KPA to standby now anyway for the MFJ 998 tuner, so
> I'm used to remembering...but am looking forward to tha KAT500...and if the
> KPA doesn't mind a little non-hard fault, so much the better.
I used a MFJ-998 before I got the KAT500 too. I had the KPA500
configured to switch to standby mode on band-change, then I'd transmit
a bit to get the MFJ to tune, then put the KPA500 in Operate. I
operated the KAT500 that way at first too (during early field-test),
but since the firmware for both KAT500 and KPA500 have matured, I've
turned off the option to standby-on-band-change on the KPA500, and
have been happily QSYing around with no resulting hard faults.
73,
~iain / N6ML
> On Dec 7, 2012, at 12:31 PM, "iain macdonnell - N6ML" <[email protected]> wrote:
>
>> 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 <[email protected]> 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" <[email protected]>
>>> To: <[email protected]>
>>> 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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