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<p><font size="+2"><font face="Arial">Hi Steve. Thank you so much
for taking the time to run the tests and to let us know your
results. It certainly warrants further experimentation as it
seems very possible to use these up on 10 GHz. TU agn es 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">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 4/22/2021 5:18 PM, Steven Kerns
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:1976051088.2915493.1619126332205@mail.yahoo.com">
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style="font-family:Helvetica Neue, Helvetica, Arial,
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<div dir="ltr" data-setdir="false">Gedas,</div>
<div dir="ltr" data-setdir="false"><span><span style="color:
rgb(0, 0, 0); font-family: Helvetica Neue, Helvetica,
Arial, sans-serif;"><br>
</span></span></div>
<div dir="ltr" data-setdir="false"><span><span style="color:
rgb(0, 0, 0); font-family: Helvetica Neue, Helvetica,
Arial, sans-serif;">Did put one of my working RW289
systems on the bench today and drove it with my demi 10GHz
xverter. It made 7W output before foldback with the beam
adjusted for 110mA (this is the suggested beam current
from Siemens). Upping the beam to 120mA yielded 12W
output. Beam adjusted to 130mA (w/1mA of Helix current)
the measured output was 21W. Siemens specs say 140mA is
the maximum beam current for the tube, but I did not want
to push the limits. When I get more time I'll play with
some external magnets to see if I can get more out of the
tube at 10Ghz</span></span><br>
</div>
<div dir="ltr" data-setdir="false"><span><span style="color:
rgb(0, 0, 0); font-family: Helvetica Neue, Helvetica,
Arial, sans-serif;"><br>
</span></span></div>
<div dir="ltr" data-setdir="false">Please strike my earlier
comments that the tube was very low power on 10GHz, seems my
memory has some lapses as I have gotten older!</div>
<div dir="ltr" data-setdir="false"><br>
</div>
<div dir="ltr" data-setdir="false">73</div>
<div dir="ltr" data-setdir="false"><br>
</div>
<div dir="ltr" data-setdir="false">Steve, N3FTI</div>
<div><br>
</div>
</div>
<div id="ydpcb2a2e79yahoo_quoted_9470200123"
class="ydpcb2a2e79yahoo_quoted">
<div style="font-family:'Helvetica Neue', Helvetica, Arial,
sans-serif;font-size:13px;color:#26282a;">
<div> On Wednesday, April 21, 2021, 09:05:28 PM EDT, Gedas via
Microwave <a class="moz-txt-link-rfc2396E" href="mailto:microwave@mailmanlists.us"><microwave@mailmanlists.us></a> wrote: </div>
<div><br>
</div>
<div><br>
</div>
<div>
<div dir="ltr">Awesome information Dave, thank you very much
!!!! 73<br>
</div>
<div dir="ltr"><br>
</div>
<div dir="ltr">Gedas, W8BYA EN70JT<br>
</div>
<div dir="ltr"><br>
</div>
<div dir="ltr">Gallery at <a href="http://w8bya.com "
rel="nofollow" target="_blank" moz-do-not-send="true">http://w8bya.com
</a>(under repair)<br>
</div>
<div dir="ltr">Light travels faster than sound....<br>
</div>
<div dir="ltr">This is why some people appear bright until
you hear them speak.<br>
</div>
<div dir="ltr"><br>
</div>
<div dir="ltr">On 4/21/2021 8:30 PM, Dave wrote:<br>
</div>
<div dir="ltr">> Late 80's, early 90's, Gedas. The NTMS
and the RVHFG (and other <br>
</div>
<div dir="ltr">> groups- surely the Pack-Rats) used them
and wrote up the tests and <br>
</div>
<div dir="ltr">> results. I know I used a 289 on 3 and 5
gig and one member (KD2KQ- <br>
</div>
<div dir="ltr">> sk) also used one on 10. As I recall,
with tweakage of the helix and <br>
</div>
<div dir="ltr">> beam voltages we saw a legit 10W on
10gig with his.<br>
</div>
<div dir="ltr">> We stopped playing with them because the
power supplies gave lots of <br>
</div>
<div dir="ltr">> problems- mostly capacitor failures and
servicing them was a real PITA.<br>
</div>
<div dir="ltr">> Dave K2DH<br>
</div>
<div dir="ltr">><br>
</div>
<div dir="ltr">><br>
</div>
<div dir="ltr">><br>
</div>
<div dir="ltr">> Sent from my Verizon, Samsung Galaxy
smartphone<br>
</div>
<div dir="ltr">><br>
</div>
<div dir="ltr">><br>
</div>
<div dir="ltr">> -------- Original message --------<br>
</div>
<div dir="ltr">> From: Gedas via Microwave <<a
href="mailto:microwave@mailmanlists.us" rel="nofollow"
target="_blank" moz-do-not-send="true">microwave@mailmanlists.us</a>><br>
</div>
<div dir="ltr">> Date: 4/21/21 19:53 (GMT-05:00)<br>
</div>
<div dir="ltr">> To: Brian Yee <<a
href="mailto:brian.w6by@gmail.com" rel="nofollow"
target="_blank" moz-do-not-send="true">brian.w6by@gmail.com</a>><br>
</div>
<div dir="ltr">> Cc: Steven Kerns <<a
href="mailto:n3fti@yahoo.com" rel="nofollow"
target="_blank" moz-do-not-send="true">n3fti@yahoo.com</a>>,
Microwave List <br>
</div>
<div dir="ltr">> <<a
href="mailto:microwave@mailmanlists.us" rel="nofollow"
target="_blank" moz-do-not-send="true">microwave@mailmanlists.us</a>><br>
</div>
<div dir="ltr">> Subject: Re: [Mw] Fw: Siemens TWT -
Model RW 289<br>
</div>
<div dir="ltr">><br>
</div>
<div dir="ltr">> That would be great to find. Any guesses
as to what decade etc?<br>
</div>
<div dir="ltr">><br>
</div>
<div dir="ltr">> Gedas, W8BYA EN70JT<br>
</div>
<div dir="ltr">><br>
</div>
<div dir="ltr">> Gallery at <a href="http://w8bya.com "
rel="nofollow" target="_blank" moz-do-not-send="true">http://w8bya.com
</a>(under repair)<br>
</div>
<div dir="ltr">> Light travels faster than sound....<br>
</div>
<div dir="ltr">> This is why some people appear bright
until you hear them speak.<br>
</div>
<div dir="ltr">><br>
</div>
<div dir="ltr">> On 4/21/2021 6:49 PM, Brian Yee wrote:<br>
</div>
<div dir="ltr">> > There were some articles in some of
the old Microwave Update<br>
</div>
<div dir="ltr">> > proceedings on how to do this.<br>
</div>
<div dir="ltr">> ><br>
</div>
<div dir="ltr">> > On Wed, Apr 21, 2021 at 1:58 PM
Gedas via Microwave<br>
</div>
<div dir="ltr">> > <<a
href="mailto:microwave@mailmanlists.us" rel="nofollow"
target="_blank" moz-do-not-send="true">microwave@mailmanlists.us</a>
<mailto:<a href="mailto:microwave@mailmanlists.us"
rel="nofollow" target="_blank" moz-do-not-send="true">microwave@mailmanlists.us</a>>>
wrote:<br>
</div>
<div dir="ltr">> ><br>
</div>
<div dir="ltr">> > Steve I wish I could tell you
but I have never tried optimizing this<br>
</div>
<div dir="ltr">> > model. Maybe someone else who
has experience will chime in. Then<br>
</div>
<div dir="ltr">> > again<br>
</div>
<div dir="ltr">> > if anyone has a PS and wants to
experiment with one of these let me<br>
</div>
<div dir="ltr">> > know. I have a handful of them
and just want to see them in the<br>
</div>
<div dir="ltr">> > hands of<br>
</div>
<div dir="ltr">> > someone who will use them. 73<br>
</div>
<div dir="ltr">> ><br>
</div>
<div dir="ltr">> > Gedas, W8BYA EN70JT<br>
</div>
<div dir="ltr">> ><br>
</div>
<div dir="ltr">> > Gallery at <a
href="http://w8bya.com " rel="nofollow" target="_blank"
moz-do-not-send="true">http://w8bya.com </a>(under
repair)<br>
</div>
<div dir="ltr">> > Light travels faster than
sound....<br>
</div>
<div dir="ltr">> > This is why some people appear
bright until you hear them speak.<br>
</div>
<div dir="ltr">> ><br>
</div>
<div dir="ltr">> > On 4/21/2021 4:45 PM, Steven
Kerns wrote:<br>
</div>
<div dir="ltr">> > > Gedas,<br>
</div>
<div dir="ltr">> > ><br>
</div>
<div dir="ltr">> > > Can you give any insight
on what the voltages should be <br>
</div>
<div dir="ltr">> adjusted to<br>
</div>
<div dir="ltr">> > > for operation on 10GHz?<br>
</div>
<div dir="ltr">> > ><br>
</div>
<div dir="ltr">> > > Thanks<br>
</div>
<div dir="ltr">> > ><br>
</div>
<div dir="ltr">> > > Steve, N3FTI<br>
</div>
<div dir="ltr">> > ><br>
</div>
<div dir="ltr">> > > On Wednesday, April 21,
2021, 04:31:36 PM EDT, Gedas<br>
</div>
<div dir="ltr">> > <<a
href="mailto:w8bya@mchsi.com" rel="nofollow"
target="_blank" moz-do-not-send="true">w8bya@mchsi.com</a>
<mailto:<a href="mailto:w8bya@mchsi.com" rel="nofollow"
target="_blank" moz-do-not-send="true">w8bya@mchsi.com</a>>><br>
</div>
<div dir="ltr">> > > wrote:<br>
</div>
<div dir="ltr">> > ><br>
</div>
<div dir="ltr">> > ><br>
</div>
<div dir="ltr">> > > Thanks for chiming in
Steve. Several others have PM me and<br>
</div>
<div dir="ltr">> > indicated<br>
</div>
<div dir="ltr">> > > that this model will still
produce ~10W on 10 GHz but the helix<br>
</div>
<div dir="ltr">> > > voltages _must_ be
readjusted. Not sure if any magnetics need<br>
</div>
<div dir="ltr">> > > optimizing. 73<br>
</div>
<div dir="ltr">> > ><br>
</div>
<div dir="ltr">> > > Gedas, W8BYA EN70JT<br>
</div>
<div dir="ltr">> > ><br>
</div>
<div dir="ltr">> > > Gallery athttp://w8bya.com
<<a href="http://w8bya.com" rel="nofollow"
target="_blank" moz-do-not-send="true">http://w8bya.com</a>>
(under repair)<br>
</div>
<div dir="ltr">> > > Light travels faster than
sound....<br>
</div>
<div dir="ltr">> > > This is why some people
appear bright until you hear them speak.<br>
</div>
<div dir="ltr">> > > On 4/21/2021 4:23 PM,
Steven Kerns via Microwave wrote:<br>
</div>
<div dir="ltr">> > >><br>
</div>
<div dir="ltr">> > >><br>
</div>
<div dir="ltr">> > >> ----- Forwarded
Message ----- From: Steven<br>
</div>
<div dir="ltr">> > Kerns<<a
href="mailto:n3fti@yahoo.com" rel="nofollow"
target="_blank" moz-do-not-send="true">n3fti@yahoo.com</a>
<mailto:<a href="mailto:n3fti@yahoo.com" rel="nofollow"
target="_blank" moz-do-not-send="true">n3fti@yahoo.com</a>>><br>
</div>
<div dir="ltr">> > <mailto:<a
href="mailto:n3fti@yahoo.com" rel="nofollow"
target="_blank" moz-do-not-send="true">n3fti@yahoo.com</a><br>
</div>
<div dir="ltr">> > <mailto:<a
href="mailto:n3fti@yahoo.com" rel="nofollow"
target="_blank" moz-do-not-send="true">n3fti@yahoo.com</a>>>To:<a
href="mailto:Midwest-Microwave@groups.io" rel="nofollow"
target="_blank" moz-do-not-send="true">Midwest-Microwave@groups.io</a><br>
</div>
<div dir="ltr">> > <<a class="moz-txt-link-freetext" href="mailto:To%">mailto:To%</a><a
href="mailto:3AMidwest-Microwave@groups.io"
rel="nofollow" target="_blank" moz-do-not-send="true">3AMidwest-Microwave@groups.io</a>><br>
</div>
<div dir="ltr">> > <mailto:<a
href="mailto:Midwest-Microwave@groups.io" rel="nofollow"
target="_blank" moz-do-not-send="true">Midwest-Microwave@groups.io</a><br>
</div>
<div dir="ltr">> > <mailto:<a
href="mailto:Midwest-Microwave@groups.io" rel="nofollow"
target="_blank" moz-do-not-send="true">Midwest-Microwave@groups.io</a>>>
<<a href="mailto:midwest-microwave@groups.io"
rel="nofollow" target="_blank" moz-do-not-send="true">midwest-microwave@groups.io</a><br>
</div>
<div dir="ltr">> > <mailto:<a
href="mailto:midwest-microwave@groups.io" rel="nofollow"
target="_blank" moz-do-not-send="true">midwest-microwave@groups.io</a>>><br>
</div>
<div dir="ltr">> > <mailto:<a
href="mailto:midwest-microwave@groups.io" rel="nofollow"
target="_blank" moz-do-not-send="true">midwest-microwave@groups.io</a><br>
</div>
<div dir="ltr">> > <mailto:<a
href="mailto:midwest-microwave@groups.io" rel="nofollow"
target="_blank" moz-do-not-send="true">midwest-microwave@groups.io</a>>>Sent:
Wednesday, April 21,<br>
</div>
<div dir="ltr">> > 2021, 04:22:13 PM EDTSubject:
Re: [Mw] Siemens TWT - Model RW 289<br>
</div>
<div dir="ltr">> > >> Gedas,<br>
</div>
<div dir="ltr">> > >> I tried using a RW289
at 10GHz a few years ago. If I remember<br>
</div>
<div dir="ltr">> > correctly the unit would make
power at 10GHz but it was greatly<br>
</div>
<div dir="ltr">> > reduced. I believe a watt or
two. I did not try to "retune" the<br>
</div>
<div dir="ltr">> > helix with external magnets or
adjust the tube's voltages, just<br>
</div>
<div dir="ltr">> > the stock tube.<br>
</div>
<div dir="ltr">> > >> I presently have the
RW2135 (10GHz version of the RW289) along<br>
</div>
<div dir="ltr">> > with a RWN320 power supply. It
makes in excess of 40W on 10GHz<br>
</div>
<div dir="ltr">> > and a little over 10W on 5.7GHz
while staying within the tube's<br>
</div>
<div dir="ltr">> > specifications for helix
current and Ik.<br>
</div>
<div dir="ltr">> > >> 73<br>
</div>
<div dir="ltr">> > >> Steve, N3FTIKutztown,
PA<br>
</div>
<div dir="ltr">> > >><br>
</div>
<div dir="ltr">> > >><br>
</div>
<div dir="ltr">> > >> On Wednesday,
April 21, 2021, 02:56:31 PM EDT, Gedas via<br>
</div>
<div dir="ltr">> > Microwave<<a
href="mailto:microwave@mailmanlists.us" rel="nofollow"
target="_blank" moz-do-not-send="true">microwave@mailmanlists.us</a><br>
</div>
<div dir="ltr">> > <mailto:<a
href="mailto:microwave@mailmanlists.us" rel="nofollow"
target="_blank" moz-do-not-send="true">microwave@mailmanlists.us</a>>><br>
</div>
<div dir="ltr">> > <mailto:<a
href="mailto:microwave@mailmanlists.us" rel="nofollow"
target="_blank" moz-do-not-send="true">microwave@mailmanlists.us</a><br>
</div>
<div dir="ltr">> > <mailto:<a
href="mailto:microwave@mailmanlists.us" rel="nofollow"
target="_blank" moz-do-not-send="true">microwave@mailmanlists.us</a>>>
wrote:<br>
</div>
<div dir="ltr">> > >><br>
</div>
<div dir="ltr">> > >> I have several
Siemens TWT's (less PS) that are rated for 10W<br>
</div>
<div dir="ltr">> > (30W peak)<br>
</div>
<div dir="ltr">> > >> from 5.9 GHz - 7.1
GHz. Really nice & small units with<br>
</div>
<div dir="ltr">> > umbilical cord &<br>
</div>
<div dir="ltr">> > >> connector. Does anyone
know if these can operate (or be made to<br>
</div>
<div dir="ltr">> > operate)<br>
</div>
<div dir="ltr">> > >> up at 10 GHz?<br>
</div>
<div dir="ltr">> > >><br>
</div>
<div dir="ltr">> > >> Gedas, W8BYA EN70JT<br>
</div>
<div dir="ltr">> > >><br>
</div>
<div dir="ltr">> > >> Gallery
athttp://w8bya.com <<a href="http://w8bya.com"
rel="nofollow" target="_blank" moz-do-not-send="true">http://w8bya.com</a>>
(under repair)<br>
</div>
<div dir="ltr">> > >> Light travels faster
than sound....<br>
</div>
<div dir="ltr">> > >> This is why some
people appear bright until you hear them speak.<br>
</div>
<div dir="ltr">> > >><br>
</div>
<div dir="ltr">> > >><br>
</div>
<div dir="ltr">> > >>
_______________________________________________<br>
</div>
<div dir="ltr">> > >> Microwave mailing list<br>
</div>
<div dir="ltr">> > >><br>
</div>
<div dir="ltr">> > >><br>
</div>
<div dir="ltr">> > >>
_______________________________________________<br>
</div>
<div dir="ltr">> > >> Microwave mailing list<br>
</div>
<div dir="ltr">> > >><br>
</div>
<div dir="ltr">> >
_______________________________________________<br>
</div>
<div dir="ltr">> > Microwave mailing list<br>
</div>
<div dir="ltr">> ><br>
</div>
<div dir="ltr">>
_______________________________________________<br>
</div>
<div dir="ltr">> Microwave mailing list<br>
</div>
<div dir="ltr">><br>
</div>
<div dir="ltr">_______________________________________________<br>
</div>
<div dir="ltr">Microwave mailing list<br>
</div>
<div dir="ltr"><br>
</div>
</div>
</div>
</div>
</blockquote>
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