[Yaesu] Alpha 78 QSK interface

[Paul Gerhardt]

I am getting ready to make a QSK interface cable for the FT-1000 MP  MK V to
an Alpha 78 and see if the QSK will work.  It is working on the test bench
with ohmmeter.

Reading the Mk V manual One part says 40V max and in another sentence it
says 15V max.  Is it safe to use a direct hookup with the Alpha 78 QSK
 voltages.

My current amp interface cable uses an external pc relay keyed by pin 2 to
key 'older' amps with open frame relays.

Paul K3PG


If using another manufacturer’s QSK linear, and if
its switching circuitry consumes less than 150 mA of
DC voltage below 40 V, you can connect the Tx/Rx
switching line for the linear to pin 2 (“TX GND”) of the
BAND DATA jack (use pin 3 for ground), and the linear’s
exciter-enable output to pin 8 (“TX INHIBIT”) of the
BAND DATA jack. This line must be switched to ground
to enable transmission once the linear is ready for excitation
from the MARK-V FT-1000MP. If your QSK linear
sinks more than 100 mA or uses more than 15 V
for T/R relay switching, you will have to provide a suitable
external interface transistor, controlled by pin 2.
Be certain to make provision for suitable reduction of
the drive power from the MARK-V FT-1000MP, so as
not to damage your amplifi

On Tue, Feb 16, 2010 at 3:00 PM, <yaesu-request at contesting.com> wrote:

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> Today's Topics:
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>   1. FT450 Linear Jack (Bry Carling)
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> ----------------------------------------------------------------------
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> Message: 1
> Date: Tue, 16 Feb 2010 08:09:42 -0500
> From: "Bry Carling" <bcarling at cfl.rr.com>
> Subject: [Yaesu] FT450 Linear Jack
> To: yaesu at contesting.com
> Message-ID: <4B7A52C6.23626.240CEDE at bcarling.cfl.rr.com>
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> Does anyone know if Yaesu provides a PLUG with their FT450 radios
> for the LINEAR JACK?
>
> It appears to be some kind of 10-pin DIN connector...
>
> Anyone have experience using this jack to switch T-R control to a relay fo
> an
> external (non-Yaesu) linear amplifier???
>
> Thanks & 73 - Brian, AF4K
>
> -~???????~-"?r? in FL?R???"-~???????~-
>
>
>
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> End of Yaesu Digest, Vol 86, Issue 7
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-- 
Paul Gerhardt
K3PG
http://pgerhardt.blogspot.com
QRP ARCI 6674
FP 274