OK, I've figured out the problem. I took a step back and realized I am
spoiled by the close integration of the K-Line. The reason the FT101 can't
the OPER-STBY button doesn't do anything. I guessed a menu setting might
Looks like I'm in business. Just need to change the menu item when I
> Just tried it out - AUX cable removed, RF Input cable removed, RCA plug
> with clip leads inserted in PA Key. Shorting the leads does not put KPA in
> TX.
>
> 73 de Chuck, WS1L
>
>
[hidden email]
>
>
> On Thu, Feb 4, 2021 at 6:54 PM Jack Brindle <
[hidden email]> wrote:
>
>> That is good. If you plug a pig-tail RCA jack into the KPA’s PTT input
>> and short the wires, does the KPA go into TX mode? If so, the issue is in
>> the transmitter or the cable you are using.
>> You should do this test with nothing connected to the KPA’s RF input.
>>
>> As i noted in my post to the reflector, Fred Cady’s book has some very
>> good info about this. Now if I can find it in my electronic copy...
>>
>> 73!
>> Jack, W6FB
>>
>>
>> On Feb 4, 2021, at 3:47 PM, Chuck Chandler <
[hidden email]> wrote:
>>
>> Hi Jack
>>
>> It’s a Yaesu FT101ZD, and my multimeter shows it closes continuity
>> between the key line center and shield on TX.
>>
>> No grid block keying!
>>
>> Chuck
>>
>> On Thu, Feb 4, 2021 at 18:37 Jack Brindle <
[hidden email]> wrote:
>>
>>> Chuck;
>>>
>>> What is the PTT output from your other radio? It needs to be just
>>> open-circuit, pull to ground on transmit. If anything else (I’m thinking
>>> grid-block keying), then I predict a trip back to the factory for your KPA.
>>>
>>> There are two key lines coming into the KPA, and going through the KAT.
>>> These are the AUX I/O PTT, and the RCA-jack PTT. They are maintained
>>> separately through the Kat on their way to the KPA. Either can key the
>>> KPA500, and both are opened by the KAT when it has high SWR or needs to
>>> tune. The AUX I/O version is only meant be used with Elecraft rigs using 0
>>> - 5 signaling. The RCA jack is likewise meant to be used with rigs that
>>> only pull the signal to ground on transmit, and leave it open on receive.
>>>
>>> Thus my question - what i the signal characteristic of the rigs PTT
>>> output?
>>>
>>> 73!
>>> Jack, W6FB
>>> Elecraft Engineering
>>>
>>>
>>> > On Feb 4, 2021, at 2:15 PM, Chuck Chandler <
[hidden email]>
>>> wrote:
>>> >
>>> > Just a follow-up to my question about using the KPA500/KAT500 with a
>>> > second, older radio. I just finished some more testing and found that
>>> when
>>> > I remove the AUX cable from the back of the KPA and try to put the KPA
>>> into
>>> > TX with the keyline, it stays in RX.
>>> >
>>> > A continuity tester confirms the rig keyline is closing when the rig
>>> is in
>>> > TX, and the KPA shows driver power output, as does the KAT. But, the
>>> KPA
>>> > won't switch to TX and amplify.
>>> >
>>> > Is there some other function keeping the KPA in RX even though the AUX
>>> > cable is disconnected?
>>> >
>>> > 73 de Chuck, WS1L
>>> >
>>> >
[hidden email]
>>> > ______________________________________________________________
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>>>
>>> --
>> Sent from Gmail Mobile Chuck Chandler
[hidden email]
>>
>>
>>