[Elecraft] KPA-500 timing settings IC-7300

[Jack Brindle]

The KPA500 is a QSK amplifier. It switches from RX to TX very rapidly (about 2 mSec) in order to allow QSK operation of the station.

The TRTime parameter sets the time the KPA takes to transition from TX to RX - this is specifically for transmitters that may continue to output RF for a short time after their PTT line becomes inactive.
For the K3, K3S and K4 that time is very short, which means the KPA can transition immediately from RX to TX (it takes less than 1 mSec). There are some transceivers that start the key up process when the PTT line becomes inactive. I don’t know what the 7300 does in this case - hopefully others on the list have this information and can tell us.

73,
Jack, W6FB


> On Jul 26, 2022, at 8:39 PM, Tom N4LSJ <n4lsj at qsl.net> wrote:
> 
> I've been on the internet and can find IC-7300 TX Delay, CW Rise Time settings for other amplifiers pretty easily.  There don't appear to be any for -specifically- the IC-7300 and KPA-500.  Are there "officially sanctioned" settings for that combination?  I feel it may be overkill to use 30ms when 10ms TX delay may suffice.  Is there also a suggested CW rise time from Elecraft?
> 
> The KPA-500 also has a "TR TIME" settings from 0 to 50 as well. Does that need to be set for the 7300?
> 
> I -DO- have a KAT-500 and the whole get-up is hooked as per the documentation on Elecraft's FTP site, e.g. the key line going to the tuner, then the amp.  That document says nothing regarding timing.
> 
> 73 to all!
> 
> Tom N4LSJ.
> 
> 
> 
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