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<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Pete, SWR protection is always a good idea to extend life time
of your amp, hi. As drive reduction doesn’t solve a mismatch problem of
the antenna, it’s better and safer to stop your amp by interrupting the
amp’s bias. An analogue ALC is not provided on any HPSDR exciter board,
because PowerSDR prevents any form of override of the board’s RF signal.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Pin1 (PTT-input) switches the Penelope to TX mode, when
grounded. At pin 13 (PTT out) you’ll have access to the drain of a buffer
FET to control e.g. an external relay for accessories like amps, XVTRs etc. Please
see schematics.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>73, Helmut, DC6NY<o:p></o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";
color:windowtext'>Von:</span></b><span style='font-size:10.0pt;font-family:
"Tahoma","sans-serif";color:windowtext'> Hpsdr
[mailto:hpsdr-bounces@lists.openhpsdr.org] <b>Im Auftrag von </b>n3evl<br>
<b>Gesendet:</b> Dienstag, 3. </span><span lang=EN-US style='font-size:10.0pt;
font-family:"Tahoma","sans-serif";color:windowtext'>Januar 2017 00:18<br>
<b>An:</b> HPSDR<br>
<b>Betreff:</b> [hpsdr] External disable of Penelope RF output?<o:p></o:p></span></p>
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<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><span lang=EN-US
style='font-size:10.0pt;font-family:"Courier New"'>I'm contemplating some kind
of high swr detection circuit in an external homebrew amp. I've seen
some designs that detect hi swr and block RF from the driving rig by using the
ALC line. Since Penelope does not have an ALC line, is there some way an
external device can tell Penelope to cease generating RF? <br>
<br>
I see Penelope has pin 1 on the DB25 connector labeled as "PTT Input -
active when connected to ground" - but I'm not sure if this is relevant to
this issue or how this pin is used.<br>
<br>
</span><span style='font-size:10.0pt;font-family:"Courier New"'>Thanks,<br>
<br>
Pete, N3EVL<br>
<br>
</span><o:p></o:p></p>
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