Worked best when the TX remained keyed (2 back the back GE Phoenixes
with an inverter and buffer between disc and mod) - Jim suggested a
delay line. If the amp uses pin diodes, should be OK. SYN lockup time
was the issue with the Phoenixes, but they did work and when I hardwired
the key line (nice coffee warmer) - it worked OK) Relay switch time
might cause the preamble to not make it - trial and error. Seems like a
little front end delay in subscriber units would make life better for
all. 73. Steve NU5D



john_ke5c wrote:
> I'm posting this here since members of this group are those most
> likely to have come across this, especially if it does not work. Will
> an RF sensing UHF amplifier work with D-Star? I am worried about the
> preamble going by before the amp has keyed and is passing RF. NU5D
> had an analog D-Star repeater working for a while, and I know he had
> to really work to get fast keying not to miss the preamble. In fact,
> he may have used a delay circuit between the repeater receiver and
> transmitter. So has anyone successfully used an off-the-shelf RF
> sensing and switching UHF amp with a D-Star transceiver, especially an
> IC-91AD?
>
> 73, John
> k5ctx sysop
>
>
>