[Elecraft] 2m internal transverter PTT out

[Joe Subich, W4TV]

Set the "band Outputs" correctly (page 19 of the K3 Owners Manual) and
build a discrete logic (TTL/CMOS) band decoder to select PTT to the
2 meter or HF/6m amplifier.

Alternatively, get a band decoder that works on the frequency data
from CAT/RS232 (like microHAM Station Master) and allow it to select
PTT to the 2 meter on HF?6m amplifier based on the CAT data.

73,

    ... Joe, W4TV


On 2020-10-20 12:14 PM, Rajiv Dewan via Elecraft wrote:
> Nice solution.
> 
> Unfortunately for me, I am trying to operate remotely.  I may just have to get a web switch and turn the amp on and off.  I am hoping that some one has a better solution.
> 
> Raj, N2RD
> 
>> On Oct 20, 2020, at 11:52 AM, <hbjr at optilink.us> <hbjr at optilink.us> wrote:
>>
>> Raj...
>> I have the same issue, but a less elegant solution.  My 2 Meter amplifier
>> has a remote head that has the keying input located on the back of it.  I
>> opened it up and wired a toggle switch in line with the circuit with an LED.
>> I labeled it STBY/OPR like on my Ameritron AL-1200.  I just flip the 2 meter
>> amp "out" of the PTT circuit when I'm not using it.
>>
>> Thanks,
>> Hank
>> K4HYJ
>>
>> -----Original Message-----
>> From: elecraft-bounces at mailman.qth.net <mailto:elecraft-bounces at mailman.qth.net> <elecraft-bounces at mailman.qth.net <mailto:elecraft-bounces at mailman.qth.net>> On
>> Behalf Of Rajiv Dewan via Elecraft
>> Sent: Tuesday, October 20, 2020 9:34 AM
>> To: Elecraft at mailman.qth.net <mailto:Elecraft at mailman.qth.net>
>> Subject: [Elecraft] 2m internal transverter PTT out
>>
>> Dear Elecrafters,
>>
>>    I have a K3 with an internal 2m transverter that I use with an external
>> amp.  Initially I had the amp connected to PTT-out but that would key the 2m
>> amp if I transmitted on any band.  To help with this, I put the optional
>> jumper on P8 in the transverter so that it put out 5v on ant3 (2m out) while
>> transmitting.  I then built a simple NPN grounded emitter circuit to key the
>> 2m amp by grounding its PTT-in when 5v show up on output of the transverter.
>> Here is the shocker:  5v show up on 2m transverter out whenever I transmit
>> on ANY band.  How disappointing.  Am I missing something?  Is there a simple
>> fix?
>>
>> Raj, N2RD