Hello Jonathan,
The FT-840, like a few Yaesu rigs, must use an external relay box
in order to properly key a conventional amplifier. You can use
either the Yaesu FB-757 relay box or the new Ameritron adaptor.
Unfortunately, Yaesu choose to support only the FL-7000 amplifier
on the FT-840, FT-890, FT-757 and others of this generation.
Regards,
Doug -- W4DXV
jonk wrote:
>
> Hi all,
> I'm still trying to put my Clipperton L AMp into service here. I had
> it repaired(shorted tube and burned rectifier diodes), but now I can get
> the radio to key the t/r relay in the Amp. I checked the cord and it's
> OK, so when I short the center and shield on the cord, the Amp goes into
> transmit. I jumpered the cord to the proper pins in the radio (pin2-tx
> ground to center and pin 3-ground-to shield) and nothing happens. It
> sems the radio just doesn't complete the circuit.
> Yaesu tech support says the radio is supposed to take pin2 low to
> ground. So, if that's true, how am I supposed to make this arrangement
> work? Any suggestions?
>
> Thanks in advance for your help
>
> 73s de Jonathan ko6xs
>
>
> ------------------------------------------------------------------------
>
> Jonathan Kaplan <jonk@moonlink.net>
> President
> JSK Enterprises, Inc.
>
> Jonathan Kaplan
> President <jonk@moonlink.net>
> JSK Enterprises, Inc.
> 6165 Zumirez Drive Work: 310-457-1545
> Malibu Fax: 310-589-1197
> CA Netscape Conference Address
> 90265 Netscape Conference DLS Server
> USA
> Additional Information:
> Last Name Kaplan
> First Name Jonathan
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