Hi Sean
I use an FT290mk2 with a sequencer. I use the 4th relay to close the PTT and
key line and plug the key and mic into a “control box” where the sequencer
relay is in line. I have the key and mic cables run to the radio. I flip a
switch to sequence and when the fourth relay closes, the key and PTT lines are
closed so I can then key or transmit.
When done, flip the switch off, and the key and PTT lines are disconnected. I
will never Key the radio until the sequencer is switched unless I intentionally
bypass this scheme and plug into the radio direct.
73 Mike
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> On Feb 13, 2018, at 10:38 AM, Sean Waite <waisean@gmail.com> wrote:
>
> I've got one of the old FT290RII 2m all modes that I'm using as the IF on
> my transverters. With the SG Lab devices, I can select between RF sense
> switching and PTT switching, but I now have a DEMI 3cm transverter that
> requries a real PTT line. The radio has the 25W amp that I'm not using for
> these purposes, I just set the radio to low power (2.5W). What I'd like to
> know is if anyone has a clever method of getting the PTT off of the radio.
> The plug for the amp has PTT on it, I believe, and the amp isn't required
> for operation. The problem with leaving the amp off to access this plug is
> that then there are just 2 little spring tabs for power on the back, which
> makes it difficult to get power to the radio.
>
> I could just tap the IF circuit for the amp inside the radio, but I wasn't
> sure if there was a less invasive option.
>
> At some point I'd like to dig up the FBA-8 battery boxes for my 290 and
> 790riis, but they appear to be kind of hard to find. It would make it less
> likely to accidentally dump 25W into a transverter.
>
> Thanks and 73,
> Sean WA1TE
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