[hfsig] RPi2B with the tapr board ...

Orrin Winton orrin.winton at gmail.com
Thu Dec 1 20:58:46 CST 2016

Thanks for the pinout, i have that, but:

My issue is this:

When i use the wsprrypi app, i need a pin that will jump up from 0V to 5V
when the Pi transmits, and the pin has to be able to supply about 10mA to a
5V reed relay.

I can put a meter on various available pins, one by one, but i don't really
know what i'm doing, and there is a good chance i will fry the Pi.

So if anyone has actually done this, it would be great to hear about it. A
pin that either goes to 0V (ptt) on transmit, or to 5V on transmit, using
the wsprryPi program. To provide ptt to an external hf amp.

Orrin wn1z

On Dec 1, 2016 15:57, "Craig Jungers" <crjungers at gmail.com> wrote:

> https://pinout.xyz/
> 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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