[hfsig] RPi2B with the tapr board ...

Craig Jungers crjungers at gmail.com
Thu Dec 1 16:04:25 CST 2016


On Thu, Dec 1, 2016 at 1:54 PM, Orrin Winton <orrin.winton at gmail.com> wrote:

> Have been running a Pi 2B with the 20m 'hat' on wspr for months. Am
> getting about 80-90 mW out, which is fine.
> Am thinking of seeing what my little HF amplifier can do to boost the
> signal to a watt or two. Certainly no more than that. (At this point i
> don't know if 85mW is enough to be boosted by my external amp. I want to
> try.)
> The amp requires PTT keying.
> Does anyone know if one of the unused pins on the Pi header becomes
> grounded on transmit, to use it as a PTT?
> Or becomes +5V to set off a reed relay.
> Thanks for any comments.
> Orrin WN1Z.
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