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<p><font size="+2"><font face="Arial">I wanted to thank all the
people who have chimed in and provided some tips and leads for
information regarding operating these on 10 GHz. The below was
PM to me from a kind op from Germany. If I read the latter
part right (which is not what the 1st part implies) it may be
possible to get 20-25W out of them. If anyone is interested in
experimenting with one let me know as I have several.<br>
</font></font></p>
<p><font size="+2"><font face="Arial">"</font></font><font size="+2"><font
face="Arial">Hello NTMS<br>
<br>
I fired up my RW289 TWTA tonite and it puts out about 22 watts
on 5760 with about -1 dBm of drive. Some fine tuning of the
front panel beam adjust allowed some peaking of the power
output. On 3456 MHz with about +10 dBm of drive it also puts
out about 20 watts. With similar drive on 2304 and 10368 MHz
only a few watts of power output is possible.<br>
<br>
When using a supply voltage of -24V the peak current draw is
about 8 to 9 amps with full drive. At idle with no drive the
current is about 5 A.<br>
<br>
I did not use the input and output filters and just connected
directly to the TWT input and output.<br>
<br>
To connect -24 volts to the unit, find the 25 pin connector on
that long cable that connects to the front panel at P12 on the
far right hand side of the TWT. I cut the cable at the point
where it split in two directions so in other words I had a 25
pin connector with about 1 ft pig tails to work with.<br>
<br>
Find the following color coded wires and connect accordingly<br>
<br>
Ground (0VDC)<br>
Small brown<br>
large green white<br>
large orange white<br>
<br>
Negative 24 VDC (-24V to -48V)<br>
Large green<br>
Large orange<br>
<br>
There appears to be two sets of small brown and white/brown
wires. The small brown wire that I used ohms out to pin B on
the twt power supply connector on the left side of the unit.
(Editors note: If you have the TWT facing you with power,
etc. switches and labeling in normal reading orientation, the
connector referenced herein is on the top of the unit...the
larger of two connectors with two thumbscrews)<br>
<br>
PTT keying is accomplished by wiring a relay across the
Standby / On switch (next to the power switch.) Open is
Standby, Closed is On.<br>
<br>
If you happen to connect the power backwards, you will blow a
15A fuse (micro fuse) immediately behind the on/off and
xmit/sby switches. So, if unit does not come on, check that
fuse!<br>
<br>
On 10GHz, 25W seems to be a typical Pout. Do not overdrive
the tube, ease the power up out of the transverter until it
maxes out and then back it off a bit (db or two).<br>
<br>
The Yellow alarm light should not illuminate when driving the
tube. You may have to adjust the helix voltage to keep
everything within tolerance.<br>
<br>
Good luck<br>
<br>
73<br>
<br>
Al W5LUA<br>
<br>
Additional comments by N5PYK<br>
<br>
Main modification needed to the unit will be a means of
switching the TWT in and out of standby (e.g. a PTT). It is
believed a simple relay across the ON/SBY switch will
accomplish this goal quite readily."</font></font><br>
</p>
<pre class="moz-signature" cols="72">Gedas, W8BYA EN70JT
Gallery at <a class="moz-txt-link-freetext" href="http://w8bya.com">http://w8bya.com</a> (under repair)
Light travels faster than sound....
This is why some people appear bright until you hear them speak.</pre>
<div class="moz-cite-prefix">On 4/21/2021 9:03 PM, Gedas wrote:<br>
</div>
<blockquote type="cite" cite="mid:1678088DD9AB09AF.17574@groups.io">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<p><font size="+2"><font face="Arial">Awesome information Dave,
thank you very much !!!! 73</font></font><br>
</p>
<pre class="moz-signature" cols="72">Gedas, W8BYA EN70JT
Gallery at <a class="moz-txt-link-freetext" href="http://w8bya.com" moz-do-not-send="true">http://w8bya.com</a> (under repair)
Light travels faster than sound....
This is why some people appear bright until you hear them speak.</pre>
<div class="moz-cite-prefix">On 4/21/2021 8:30 PM, Dave wrote:<br>
</div>
<blockquote type="cite"
cite="mid:20210422003045.DF589C20669@njtozpfv23.mcomdc.com">
<meta http-equiv="Content-Type" content="text/html;
charset=UTF-8">
<div dir="auto">Late 80's, early 90's, Gedas. The NTMS and the
RVHFG (and other groups- surely the Pack-Rats) used them and
wrote up the tests and results. I know I used a 289 on 3 and
5 gig and one member (KD2KQ- sk) also used one on 10. As I
recall, with tweakage of the helix and beam voltages we saw a
legit 10W on 10gig with his.</div>
<div dir="auto">We stopped playing with them because the power
supplies gave lots of problems- mostly capacitor failures and
servicing them was a real PITA.</div>
<div dir="auto">Dave K2DH </div>
<div dir="auto"><br>
</div>
<div dir="auto"><br>
</div>
<div dir="auto"><br>
</div>
<div id="composer_signature" dir="auto">
<meta http-equiv="Content-Type" content="text/html;
charset=UTF-8">
<div style="font-size:85%;color:#575757">Sent from my Verizon,
Samsung Galaxy smartphone</div>
</div>
<div dir="auto"><br>
</div>
<div><br>
</div>
<div dir="auto" style="font-size:100%;color:#000000"
align="left">
<div>-------- Original message --------</div>
<div>From: Gedas via Microwave <a
class="moz-txt-link-rfc2396E"
href="mailto:microwave@mailmanlists.us"
moz-do-not-send="true"><microwave@mailmanlists.us></a>
</div>
<div>Date: 4/21/21 19:53 (GMT-05:00) </div>
<div>To: Brian Yee <a class="moz-txt-link-rfc2396E"
href="mailto:brian.w6by@gmail.com" moz-do-not-send="true"><brian.w6by@gmail.com></a>
</div>
<div>Cc: Steven Kerns <a class="moz-txt-link-rfc2396E"
href="mailto:n3fti@yahoo.com" moz-do-not-send="true"><n3fti@yahoo.com></a>,
Microwave List <a class="moz-txt-link-rfc2396E"
href="mailto:microwave@mailmanlists.us"
moz-do-not-send="true"><microwave@mailmanlists.us></a>
</div>
<div>Subject: Re: [Mw] Fw: Siemens TWT - Model RW 289 </div>
<div><br>
</div>
</div>
That would be great to find. Any guesses as to what decade etc?<br>
<br>
Gedas, W8BYA EN70JT<br>
<br>
Gallery at <a class="moz-txt-link-freetext"
href="http://w8bya.com" moz-do-not-send="true">http://w8bya.com</a>
(under repair)<br>
Light travels faster than sound....<br>
This is why some people appear bright until you hear them speak.<br>
<br>
On 4/21/2021 6:49 PM, Brian Yee wrote:<br>
> There were some articles in some of the old Microwave
Update <br>
> proceedings on how to do this.<br>
><br>
> On Wed, Apr 21, 2021 at 1:58 PM Gedas via Microwave <br>
> <<a class="moz-txt-link-abbreviated"
href="mailto:microwave@mailmanlists.us" moz-do-not-send="true">microwave@mailmanlists.us</a>
<a class="moz-txt-link-rfc2396E"
href="mailto:microwave@mailmanlists.us" moz-do-not-send="true"><mailto:microwave@mailmanlists.us></a>>
wrote:<br>
><br>
> Steve I wish I could tell you but I have never tried
optimizing this<br>
> model. Maybe someone else who has experience will chime
in. Then<br>
> again<br>
> if anyone has a PS and wants to experiment with one of
these let me<br>
> know. I have a handful of them and just want to see
them in the<br>
> hands of<br>
> someone who will use them. 73<br>
><br>
> Gedas, W8BYA EN70JT<br>
><br>
> Gallery at <a class="moz-txt-link-freetext"
href="http://w8bya.com" moz-do-not-send="true">http://w8bya.com</a>
(under repair)<br>
> Light travels faster than sound....<br>
> This is why some people appear bright until you hear
them speak.<br>
><br>
> On 4/21/2021 4:45 PM, Steven Kerns wrote:<br>
> > Gedas,<br>
> ><br>
> > Can you give any insight on what the voltages
should be adjusted to<br>
> > for operation on 10GHz?<br>
> ><br>
> > Thanks<br>
> ><br>
> > Steve, N3FTI<br>
> ><br>
> > On Wednesday, April 21, 2021, 04:31:36 PM EDT,
Gedas<br>
> <<a class="moz-txt-link-abbreviated"
href="mailto:w8bya@mchsi.com" moz-do-not-send="true">w8bya@mchsi.com</a>
<a class="moz-txt-link-rfc2396E" href="mailto:w8bya@mchsi.com"
moz-do-not-send="true"><mailto:w8bya@mchsi.com></a>><br>
> > wrote:<br>
> ><br>
> ><br>
> > Thanks for chiming in Steve. Several others have
PM me and<br>
> indicated<br>
> > that this model will still produce ~10W on 10 GHz
but the helix<br>
> > voltages _must_ be readjusted. Not sure if any
magnetics need<br>
> > optimizing. 73<br>
> ><br>
> > Gedas, W8BYA EN70JT<br>
> ><br>
> > Gallery athttp://w8bya.com <a
class="moz-txt-link-rfc2396E" href="http://w8bya.com"
moz-do-not-send="true"><http://w8bya.com></a> (under
repair)<br>
> > Light travels faster than sound....<br>
> > This is why some people appear bright until you
hear them speak.<br>
> > On 4/21/2021 4:23 PM, Steven Kerns via Microwave
wrote:<br>
> >><br>
> >><br>
> >> ----- Forwarded Message ----- From: Steven<br>
> Kerns<<a class="moz-txt-link-abbreviated"
href="mailto:n3fti@yahoo.com" moz-do-not-send="true">n3fti@yahoo.com</a>
<a class="moz-txt-link-rfc2396E" href="mailto:n3fti@yahoo.com"
moz-do-not-send="true"><mailto:n3fti@yahoo.com></a>> <br>
> <<a class="moz-txt-link-freetext"
href="mailto:n3fti@yahoo.com" moz-do-not-send="true">mailto:n3fti@yahoo.com</a><br>
> <a class="moz-txt-link-rfc2396E"
href="mailto:n3fti@yahoo.com" moz-do-not-send="true"><mailto:n3fti@yahoo.com></a>><a
class="moz-txt-link-abbreviated"
href="mailto:To:Midwest-Microwave@groups.io"
moz-do-not-send="true">To:Midwest-Microwave@groups.io</a><br>
> <a class="moz-txt-link-rfc2396E"
href="mailto:To%3AMidwest-Microwave@groups.io"
moz-do-not-send="true"><mailto:To%3AMidwest-Microwave@groups.io></a><br>
> <<a class="moz-txt-link-freetext"
href="mailto:Midwest-Microwave@groups.io"
moz-do-not-send="true">mailto:Midwest-Microwave@groups.io</a><br>
> <a class="moz-txt-link-rfc2396E"
href="mailto:Midwest-Microwave@groups.io"
moz-do-not-send="true"><mailto:Midwest-Microwave@groups.io></a>>
<<a class="moz-txt-link-abbreviated"
href="mailto:midwest-microwave@groups.io"
moz-do-not-send="true">midwest-microwave@groups.io</a><br>
> <a class="moz-txt-link-rfc2396E"
href="mailto:midwest-microwave@groups.io"
moz-do-not-send="true"><mailto:midwest-microwave@groups.io></a>><br>
> <<a class="moz-txt-link-freetext"
href="mailto:midwest-microwave@groups.io"
moz-do-not-send="true">mailto:midwest-microwave@groups.io</a><br>
> <a class="moz-txt-link-rfc2396E"
href="mailto:midwest-microwave@groups.io"
moz-do-not-send="true"><mailto:midwest-microwave@groups.io></a>>Sent:
Wednesday, April 21,<br>
> 2021, 04:22:13 PM EDTSubject: Re: [Mw] Siemens TWT -
Model RW 289<br>
> >> Gedas,<br>
> >> I tried using a RW289 at 10GHz a few years
ago. If I remember<br>
> correctly the unit would make power at 10GHz but it was
greatly<br>
> reduced. I believe a watt or two. I did not try to
"retune" the<br>
> helix with external magnets or adjust the tube's
voltages, just<br>
> the stock tube.<br>
> >> I presently have the RW2135 (10GHz version of
the RW289) along<br>
> with a RWN320 power supply. It makes in excess of 40W
on 10GHz<br>
> and a little over 10W on 5.7GHz while staying within
the tube's<br>
> specifications for helix current and Ik.<br>
> >> 73<br>
> >> Steve, N3FTIKutztown, PA<br>
> >><br>
> >><br>
> >> On Wednesday, April 21, 2021, 02:56:31 PM
EDT, Gedas via<br>
> Microwave<<a class="moz-txt-link-abbreviated"
href="mailto:microwave@mailmanlists.us" moz-do-not-send="true">microwave@mailmanlists.us</a><br>
> <a class="moz-txt-link-rfc2396E"
href="mailto:microwave@mailmanlists.us" moz-do-not-send="true"><mailto:microwave@mailmanlists.us></a>><br>
> <<a class="moz-txt-link-freetext"
href="mailto:microwave@mailmanlists.us" moz-do-not-send="true">mailto:microwave@mailmanlists.us</a><br>
> <a class="moz-txt-link-rfc2396E"
href="mailto:microwave@mailmanlists.us" moz-do-not-send="true"><mailto:microwave@mailmanlists.us></a>>
wrote:<br>
> >><br>
> >> I have several Siemens TWT's (less PS) that
are rated for 10W<br>
> (30W peak)<br>
> >> from 5.9 GHz - 7.1 GHz. Really nice &
small units with<br>
> umbilical cord &<br>
> >> connector. Does anyone know if these can
operate (or be made to<br>
> operate)<br>
> >> up at 10 GHz?<br>
> >><br>
> >> Gedas, W8BYA EN70JT<br>
> >><br>
> >> Gallery athttp://w8bya.com <a
class="moz-txt-link-rfc2396E" href="http://w8bya.com"
moz-do-not-send="true"><http://w8bya.com></a> (under
repair)<br>
> >> Light travels faster than sound....<br>
> >> This is why some people appear bright until
you hear them speak.<br>
> >><br>
> >><br>
> >>
_______________________________________________<br>
> >> Microwave mailing list<br>
> >><br>
> >><br>
> >>
_______________________________________________<br>
> >> Microwave mailing list<br>
> >><br>
> _______________________________________________<br>
> Microwave mailing list<br>
><br>
_______________________________________________<br>
Microwave mailing list<br>
<br>
</blockquote>
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