K3 and linear amp

[Phil Salas]

"Beware the manual for the AL1200 doesn't appear to mention the change
over timing of it's relay, the K3 outputs RF approx 10 milli seconds
after the linear keying line goes low - measured on mine with a half
decent scope. There is currently no adjustable delay for that timing in
the K3 ..."

I measured the relay switching time of my ALS-600 open frame relay, and it
took 15ms.  I replaced the open frame relay with high-speed signal relays
that switch in <5ms and everything works great.  But these signal relays are
not hefty enough to handle an AL1200.

Phil - AD5X

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[Doug Alspaugh]

You can still use the amp by manually activating the transmit switch on both pieces of gear. I do this with one old rig I have. Not the nicest solution but it will work  By the way I have the QSK add on switch and it works real nice for QSK CW


73 Doug K3DUG


K3 #????
 -------------- Original message ----------------------
From: "Roger Marrotte" <[hidden email]>

> I guess as of now I'm out of luck if I want to use my amp with a K3.  I just
> checked the manual for my AL-811H and "The open frame relay in the AL-811H
> takes approximately 15ms to switch states".  My K3 is on order.  I hope
> there's a K3 firmware change made before I get my K3, that will allow me to
> adjust the change over timing.  I'm far from an expert with amps.  I have no
> idea what an average switch over time is for amps in general.  Ameritron
> sells a high speed switching option, the QSK-5, that reduces the switching
> time to 1ms.  It costs around $300.00.  A K3 firmware change would sure be
> less expensive.
>
> Roger, W1EM  
>
> -----Original Message-----
> From: [hidden email]
> [mailto:[hidden email]] On Behalf Of Dave G4AON
> Sent: Thursday, March 20, 2008 10:45 AM
> To: [hidden email]
> Subject: [Elecraft] K3 and linear amp
>
> Todd
>
> Beware the manual for the AL1200 doesn't appear to mention the change over
> timing of it's relay, the K3 outputs RF approx 10 milli seconds after the
> linear keying line goes low - measured on mine with a half decent scope.
> There is currently no adjustable delay for that timing in the K3 (although
> it has been mentioned as being on the "to do" list), even my TS-480 has a
> choice of 10 mS or 25 mS - it only costs half the price of a K3...
>
> 73 Dave, G4AON
> K3/100 #80
> ================
>
> One question remains and it is probably ridiculously simple but I can not
> see it. How do I get the K3 to trigger the relay in my Ameritron AL 1200?. I
> see no connection for a cable to the amp nor nothing in the config menu.
>
> thanks in advance!
>
> 73
> de
> todd
> WB2ZAB
>
>
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