[Elecraft] KPA500 cables needed

[Phil & Debbie Salas]

I did get the tip and ring reversed.  I.e. TIP is ALC and RING is Tx Req. 
However, the Tx Req IS an INPUT to the radio.  From the manual:

"This 3.5-mm 3-pin jack accepts external ALC (Automatic
Level Control) voltage from a linear amplifier on the tip
connection, and accepts a "Transmit Request" command
on the ring connection. The main shaft is the ground return.
The "TX Request" connection, when shorted to ground,
puts the FT-897D into the transmit mode, and sends out
a steady CW carrier, for linear amplifier or manual antenna
tuner adjustment."

Phil - AD5X

----- Original Message ----- 
From: "Joe Subich, W4TV" <lists at subich.com>
To: "Phil & Debbie Salas" <dpsalas at tx.rr.com>
Cc: <elecraft at mailman.qth.net>
Sent: Wednesday, August 10, 2011 7:42 AM
Subject: Re: [Elecraft] KPA500 cables needed


>
>> That ACC jack tip is for an INPUT to the FT-857/897. I.e., grounding
>> this input puts the radio into a CW transmit mode for tuning an
>> external tuner.
>
> Not according to the FT-897 Operating Manual, page 18 (Rear Panel
> Connections).  This may be yet another case of blatantly incorrect
> data in Yaesu's manuals but I referred directly to the manual before
> posting the information.
>
> 73,
>
>    ... Joe, W4TV
>
> On 8/10/2011 7:04 AM, Phil & Debbie Salas wrote:
>> "The FT-897 has an "extra" TX GND signal on the tip of the ACC jack.
>> A cable with stereo 3.5mm plug to RCA plug can be used to connect
>> the ACC jack to the KPA PA Key jack ... an off the shelf 3.5mm stereo
>> to 2 x RCA cable can be used for ALC and PA Key if desired."
>>
>> That ACC jack tip is for an INPUT to the FT-857/897.  I.e., grounding 
>> this
>> input puts the radio into a CW transmit mode for tuning an external 
>> tuner.
>> The ring is ALC.  You must use the miniDIN8 connector for amp keying.
>>
>> Phil - AD5X
>>
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