<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body text="#000000" bgcolor="#FFFFFF">
<div class="moz-cite-prefix">
<pre>Dick and ALL,
the HPA-8000B PA from Hilberling exploits a RF-Sampler consisting of a
capacitive divider of 5.6 pF and 2.7 nF followed by a 1/2 resitive
divider made with two 100 Ohm resistors.
The overall attenuation is about -60 dB with high flatness within 1.8
and 70 MHz.
I have decribed the PA and the sampler in Ham Radio magazine CQ-DL
(2-2017, 3-2017) sorry, yet only in German.
The entire article can be downloaded here: Part 1 (showing sampler
diagram): <a class="moz-txt-link-freetext" href="http://dl0sdr.de/hpa-8000b-teil-1.html">http://dl0sdr.de/hpa-8000b-teil-1.html</a> Part 2:
<a class="moz-txt-link-freetext" href="http://dl0sdr.de/hpa-8000b-teil-2.html">http://dl0sdr.de/hpa-8000b-teil-2.html</a>
73, Klaus, DK7XL/DL0SDR</pre>
<br>
<br>
<br>
Am 05.09.2018 um 21:10 schrieb Scott Traurig:<br>
</div>
<blockquote type="cite"
cite="mid:CAGK9zXobEfVE2a4jiFF0_RAienc2auRyypw-OiwooK44x8FvtQ@mail.gmail.com">
<pre wrap="">***** High Performance Software Defined Radio Discussion List *****
</pre>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<meta http-equiv="content-type" content="text/html; charset=utf-8">
<div dir="ltr">It may be worth adding that, within reason, higher
feedback signal levels are better than lower ones. That way the
ratio of feedback signal to any crosstalk signals that might
exist remains as high as practical.
<div><br>
</div>
<div>73,</div>
<div><br>
</div>
<div>Scott<br>
<br>
<div class="gmail_quote">
<div dir="ltr">On Wed, Sep 5, 2018 at 3:02 PM Richard Grubb
<<a href="mailto:richard.n.grubb@comcast.net"
moz-do-not-send="true">richard.n.grubb@comcast.net</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div>Thanks Scott. </div>
<div><br>
</div>
<div>The resistive coupler I built is peculiar to the
contents of my Junk Box. I used a series parallel
arrangement of 9 half watt metal film resistors in three
parallel - series groups and a 51 ohm terminator to
provide -51 dB coupling and the necessary voltage and
power rating for 1 kW. It is flat to a dB or so from 160
- 6m. Actually the Pure Signal 2 implementation is very
non critical on sample levels. The software is
completely happy with the linear enabled at 800 - 1000W.
However turning the linear off and just having 5W from
the ANAN 10, although the software flags low level, it
still reduces the IMD by ~30 dB. Kudos to 16 bits of
dynamic range. A great piece of software ! Thank you
HPSDR programmers !!</div>
<div><br>
</div>
<div>It might be worth including a note on the
alternatives here in the Power Signal documentation.</div>
<div><br>
</div>
<div>73, Dick W0QM, G3FNL</div>
<div><br>
</div>
<div><br>
</div>
<div id="m_-5507001509339529671xe208c8139532460">
<blockquote
cite="http://CAGK9zXpRMDdpf1ejuia7OjvHLTovgpKdFE2wt=tByM3iuxhkAA@mail.gmail.com"
type="cite" class="m_-5507001509339529671cite2">
</blockquote>
</div>
</blockquote>
</div>
</div>
</div>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<pre wrap="">_______________________________________________
HPSDR Discussion List
To post msg: <a class="moz-txt-link-abbreviated" href="mailto:hpsdr@openhpsdr.org">hpsdr@openhpsdr.org</a>
Subscription help: <a class="moz-txt-link-freetext" href="http://lists.openhpsdr.org/listinfo.cgi/hpsdr-openhpsdr.org">http://lists.openhpsdr.org/listinfo.cgi/hpsdr-openhpsdr.org</a>
HPSDR web page: <a class="moz-txt-link-freetext" href="http://openhpsdr.org">http://openhpsdr.org</a>
Archives: <a class="moz-txt-link-freetext" href="http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/">http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/</a></pre>
</blockquote>
<p><br>
</p>
</body>
</html>