<div dir="ltr"><a href="https://pinout.xyz/">https://pinout.xyz/</a><br></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Dec 1, 2016 at 1:54 PM, Orrin Winton <span dir="ltr"><<a href="mailto:orrin.winton@gmail.com" target="_blank">orrin.winton@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><p dir="ltr">Have been running a Pi 2B with the 20m 'hat' on wspr for months. Am getting about 80-90 mW out, which is fine.</p>
<p dir="ltr">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.)</p>
<p dir="ltr">The amp requires PTT keying.</p>
<p dir="ltr">QUESTION:<br>
Does anyone know if one of the unused pins on the Pi header becomes grounded on transmit, to use it as a PTT?</p>
<p dir="ltr">Or becomes +5V to set off a reed relay.</p>
<p dir="ltr">Thanks for any comments.</p>
<p dir="ltr">Orrin WN1Z.<br></p>
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