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<font size="-1"><font face="Courier New, Courier, monospace">Hi
Helmut,<br>
<br>
Thanks for the information. I'll review my existing bias
switching arrangement and figure out a way to interrupt on high
SWR. I was concerned if there was a problem with still
supplying RF to the AMP in this mode and certainly don't want to
get into issues with hot-switching relays in the RF input
circuit.<br>
<br>
I'm already using the PTT out pin and also using the open
collectors for band selection on the associated LPF.<br>
<br>
Pete<br>
</font></font><br>
<div class="moz-cite-prefix">On 1/3/2017 7:21 AM, Helmut wrote:<br>
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<div class="Section1">
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US">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
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US">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
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US"><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>
<div>
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1.0pt;padding:3.0pt 0cm 0cm 0cm">
<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
[<a class="moz-txt-link-freetext" href="mailto:hpsdr-bounces@lists.openhpsdr.org">mailto:hpsdr-bounces@lists.openhpsdr.org</a>] <b>Im
Auftrag von </b>n3evl<br>
<b>Gesendet:</b> Dienstag, 3. </span><span
style="font-size:10.0pt;
font-family:"Tahoma","sans-serif";color:windowtext"
lang="EN-US">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>
</div>
</div>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span
style="font-size:10.0pt;font-family:"Courier New""
lang="EN-US">I'm contemplating some kind
of high swr detection circuit in an external homebrew amp.Â
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?Â
<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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