[Elecraft] KPA500 Issue

[kevin]

For the same reason we call using Morse Code CW.

It is more accurately referenced as Discontinuous Wave.

    73,  Kevin.  KD5ONS


On 4/1/22 13:23, Fred Jensen wrote:
> Why do we call this "wireless?"
>
> 73,
>
> Fred ["Skip"] K6DGW
> Sparks NV DM09dn
> Washoe County
>
> Jack Brindle via Elecraft wrote on 3/31/2022 9:47 PM:
>> OK, now this is starting to make sense. Jim’s K3 has a KIO3, not the 
>> newer KIO3B. On the older board, the BAND and PTT lines have pullup 
>> resistors to the Vcc rail.
>> When the K3 is powered off, that Vcc rail is at 0 volts, which means 
>> the pull-ups are now pulldowns. Thus the K3 is inadvertently keying 
>> the KPA500. If the KPA
>> detects that the KEY input is low when the user tries to put it into 
>> OPER mode, the amplifier will reject the request and stay in STBY. 
>> Thus the condition that
>> Jim is seeing.
>>
>> Try disconnecting the AUXIO cable from the KPA500 and see if it now 
>> operates properly. You may actually need to connect the KAT500 to the 
>> KPA using both the AuxIO
>> and phono cables (for PTT) depending on which radio is in use.
>>
>> The main issue is how to disconnect the PTT signal from the K3 to the 
>> KPA when using the Icom. Otherwise you may be able to leave the AuxIO 
>> cable connected.
>> I know that Fred Cady discussed sharing a KPA between two radios in 
>> his book, but has anyone solved this situation - one radio is a K3, 
>> the other something else?
>>
>> 73,
>> Jack, W6FB
>>
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