When you hook up, connect the cable, and power the tuner first.  Then 
when you power up the radio it will recognize the tuner (hopefully). 
I'm not sure the radio will see the tuner if  you do it the other way 
around (radio powered first, then tuner).

73, Steve KW3A

On 12/14/2012 1:44 PM, Rick wrote:
> On 12/14/2012 11:44 AM, Steve Forst wrote:
>> While the AT-300 has long been discontinued, it is still the "standard"
>> that Kenwood radios  interface with.  Other external auto tuners will
>> emulate the AT-300 when interfacing with Kenwood radios.   I'm fairly
>> sure that if you can figure out the pin outs from the tuner cable, you
>> can connect it to the molex jack on the radio  and then just use the
>> radio's tune button to auto tune.    There may well be some pre made
>> cables out there if you dig around.   If you check the e-ham  product
>> reviews, there are guys who will do custom interface cables at
>> reasonable cost.
>>
>> There is also a trick of putting  a 10k ohm resistor between the center
>> 2 holes of the molex jack on the radio. While this doesn't control the
>> auto tuner  automaticly, when you hit the tune button on the radio, it
>> bypasses the internal tuner,  switches the radio to CW and lowers power
>> to 10 watts.  Then you tune the tuner, and when it is matched, hit the
>> radio's tune button again to return to original mode and power setting.
>>      I've never done this and am going from memory, so confirm from
>> another source before trying this.
>>
>> 73, Steve  KW3A
> thanks, I'll check into those cables.
> Mean while I have a At-250 or 200, not sure connected to my TS-50 that
> I'm going to try.
> It has the correct plug on it.
>
> thanks, and 7 3.
>
>
>