K3 and Homebrewed QSK for QRO

[Gary Smith-2]

I've been looking without success for a used QSK Master to work with
my K3 and Ameritron AL-1500.

The circuit on this page reflects what was in the 2008 QST article on
building your own external QSK box.
http://www.ad5x.com/images/Articles/QSKrevB.pdf

I wonder if anyone has built this and is using it with the K3. If so,
what insight can you give to help me decide necessary values? I don't
have an oscilloscope to test the timing measurement. I'm also not
sure if the receiver/amp interface (he used a  modified Ameritron ARB-
704), is needed with the K3.

Thanks,

Gary
KA1J
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[Cookie]

I bought two of these.  I have built one and have it in service with my Elecraft K3 and my Dentron Clipperton L with about 600 watts output.  It is designed for the ALS-600, so the AL-1500 will be putting out a good bit more power.  The relays are very small and rated at 2 amps.  Two contacts are paralleled to provide a 4 amp rating.  You might be able to parallel two of these circuits for more power.  AD5X is a regular on this reflector, so you may get a more authoritive opinion from him.

I am a frequent CW user and enjoy the QSK a lot.  I was concerned about the small relays, but after a few CW contests with great results, I am losing those concerns.  I usually operate at about 20 to 27 wpm, but I have operated up to 50 for short periods with it and no apparent problems.  The only negative is that the sub-receiver pops some when using it in QSK, but not enough to keep me from enjoying QSK when using the sub receiver.

AD5X offers the product in kit form.  You need to be able to solder small stuff, but it is duck soup compared to a WinKeyer, much less a K2.
 Willis 'Cookie' Cooke
K5EWJ




________________________________
From: Gary Smith <[hidden email]>
To: [hidden email]
Sent: Thu, February 18, 2010 10:20:49 AM
Subject: [Elecraft] K3 and Homebrewed QSK for QRO

I've been looking without success for a used QSK Master to work with
my K3 and Ameritron AL-1500.

The circuit on this page reflects what was in the 2008 QST article on
building your own external QSK box.
http://www.ad5x.com/images/Articles/QSKrevB.pdf

I wonder if anyone has built this and is using it with the K3. If so,
what insight can you give to help me decide necessary values? I don't
have an oscilloscope to test the timing measurement. I'm also not
sure if the receiver/amp interface (he used a  modified Ameritron ARB-
704), is needed with the K3.

Thanks,

Gary
KA1J
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[Phil Salas]

"The circuit on this page reflects what was in the 2008 QST article on
building your own external QSK box.
http://www.ad5x.com/images/Articles/QSKrevB.pdf"

Gary - Just build the circuit as shown.  It switches in less than 5ms, and
works great with the K3 and any amplifier and handles full legal limit.  The
circuit referenced by Cookie is an internal pcb QSK mod that is designed for
the ALS-500 and ALS-600.

Phil - AD5X

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