[10gigs] Siemens TWT - Model RW 289
Gedas
w8bya at mchsi.com
Thu Apr 22 16:43:57 CDT 2021
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 !
Gedas, W8BYA EN70JT
Gallery at http://w8bya.com (under repair)
Light travels faster than sound....
This is why some people appear bright until you hear them speak.
On 4/22/2021 5:18 PM, Steven Kerns wrote:
> Gedas,
>
> 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
>
> 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!
>
> 73
>
> Steve, N3FTI
>
> On Wednesday, April 21, 2021, 09:05:28 PM EDT, Gedas via Microwave
> <microwave at mailmanlists.us> wrote:
>
>
> Awesome information Dave, thank you very much !!!! 73
>
> Gedas, W8BYA EN70JT
>
> Gallery at http://w8bya.com <http://w8bya.com >(under repair)
> Light travels faster than sound....
> This is why some people appear bright until you hear them speak.
>
> On 4/21/2021 8:30 PM, Dave wrote:
> > 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.
> > We stopped playing with them because the power supplies gave lots of
> > problems- mostly capacitor failures and servicing them was a real PITA.
> > Dave K2DH
> >
> >
> >
> > Sent from my Verizon, Samsung Galaxy smartphone
> >
> >
> > -------- Original message --------
> > From: Gedas via Microwave <microwave at mailmanlists.us
> <mailto:microwave at mailmanlists.us>>
> > Date: 4/21/21 19:53 (GMT-05:00)
> > To: Brian Yee <brian.w6by at gmail.com <mailto:brian.w6by at gmail.com>>
> > Cc: Steven Kerns <n3fti at yahoo.com <mailto:n3fti at yahoo.com>>,
> Microwave List
> > <microwave at mailmanlists.us <mailto:microwave at mailmanlists.us>>
> > Subject: Re: [Mw] Fw: Siemens TWT - Model RW 289
> >
> > That would be great to find. Any guesses as to what decade etc?
> >
> > Gedas, W8BYA EN70JT
> >
> > Gallery at http://w8bya.com <http://w8bya.com >(under repair)
> > Light travels faster than sound....
> > This is why some people appear bright until you hear them speak.
> >
> > On 4/21/2021 6:49 PM, Brian Yee wrote:
> > > There were some articles in some of the old Microwave Update
> > > proceedings on how to do this.
> > >
> > > On Wed, Apr 21, 2021 at 1:58 PM Gedas via Microwave
> > > <microwave at mailmanlists.us <mailto:microwave at mailmanlists.us>
> <mailto:microwave at mailmanlists.us <mailto:microwave at mailmanlists.us>>>
> wrote:
> > >
> > > Steve I wish I could tell you but I have never tried
> optimizing this
> > > model. Maybe someone else who has experience will chime in. Then
> > > again
> > > if anyone has a PS and wants to experiment with one of these
> let me
> > > know. I have a handful of them and just want to see them in the
> > > hands of
> > > someone who will use them. 73
> > >
> > > Gedas, W8BYA EN70JT
> > >
> > > Gallery at http://w8bya.com (under repair)
> > > Light travels faster than sound....
> > > This is why some people appear bright until you hear them speak.
> > >
> > > On 4/21/2021 4:45 PM, Steven Kerns wrote:
> > > > Gedas,
> > > >
> > > > Can you give any insight on what the voltages should be
> > adjusted to
> > > > for operation on 10GHz?
> > > >
> > > > Thanks
> > > >
> > > > Steve, N3FTI
> > > >
> > > > On Wednesday, April 21, 2021, 04:31:36 PM EDT, Gedas
> > > <w8bya at mchsi.com <mailto:w8bya at mchsi.com>
> <mailto:w8bya at mchsi.com <mailto:w8bya at mchsi.com>>>
> > > > wrote:
> > > >
> > > >
> > > > Thanks for chiming in Steve. Several others have PM me and
> > > indicated
> > > > that this model will still produce ~10W on 10 GHz but the helix
> > > > voltages _must_ be readjusted. Not sure if any magnetics need
> > > > optimizing. 73
> > > >
> > > > Gedas, W8BYA EN70JT
> > > >
> > > > Gallery athttp://w8bya.com <http://w8bya.com> (under repair)
> > > > Light travels faster than sound....
> > > > This is why some people appear bright until you hear them speak.
> > > > On 4/21/2021 4:23 PM, Steven Kerns via Microwave wrote:
> > > >>
> > > >>
> > > >> ----- Forwarded Message ----- From: Steven
> > > Kerns<n3fti at yahoo.com <mailto:n3fti at yahoo.com>
> <mailto:n3fti at yahoo.com <mailto:n3fti at yahoo.com>>>
> > > <mailto:n3fti at yahoo.com <mailto:n3fti at yahoo.com>
> > > <mailto:n3fti at yahoo.com
> <mailto:n3fti at yahoo.com>>>To:Midwest-Microwave at groups.io
> <mailto:Midwest-Microwave at groups.io>
> > > <mailto:To%3AMidwest-Microwave at groups.io
> <mailto:3AMidwest-Microwave at groups.io>>
> > > <mailto:Midwest-Microwave at groups.io
> <mailto:Midwest-Microwave at groups.io>
> > > <mailto:Midwest-Microwave at groups.io
> <mailto:Midwest-Microwave at groups.io>>> <midwest-microwave at groups.io
> <mailto:midwest-microwave at groups.io>
> > > <mailto:midwest-microwave at groups.io
> <mailto:midwest-microwave at groups.io>>>
> > > <mailto:midwest-microwave at groups.io
> <mailto:midwest-microwave at groups.io>
> > > <mailto:midwest-microwave at groups.io
> <mailto:midwest-microwave at groups.io>>>Sent: Wednesday, April 21,
> > > 2021, 04:22:13 PM EDTSubject: Re: [Mw] Siemens TWT - Model RW 289
> > > >> Gedas,
> > > >> I tried using a RW289 at 10GHz a few years ago. If I remember
> > > correctly the unit would make power at 10GHz but it was greatly
> > > reduced. I believe a watt or two. I did not try to "retune" the
> > > helix with external magnets or adjust the tube's voltages, just
> > > the stock tube.
> > > >> I presently have the RW2135 (10GHz version of the RW289) along
> > > with a RWN320 power supply. It makes in excess of 40W on 10GHz
> > > and a little over 10W on 5.7GHz while staying within the tube's
> > > specifications for helix current and Ik.
> > > >> 73
> > > >> Steve, N3FTIKutztown, PA
> > > >>
> > > >>
> > > >> On Wednesday, April 21, 2021, 02:56:31 PM EDT, Gedas via
> > > Microwave<microwave at mailmanlists.us
> <mailto:microwave at mailmanlists.us>
> > > <mailto:microwave at mailmanlists.us
> <mailto:microwave at mailmanlists.us>>>
> > > <mailto:microwave at mailmanlists.us
> <mailto:microwave at mailmanlists.us>
> > > <mailto:microwave at mailmanlists.us
> <mailto:microwave at mailmanlists.us>>> wrote:
> > > >>
> > > >> I have several Siemens TWT's (less PS) that are rated for 10W
> > > (30W peak)
> > > >> from 5.9 GHz - 7.1 GHz. Really nice & small units with
> > > umbilical cord &
> > > >> connector. Does anyone know if these can operate (or be made to
> > > operate)
> > > >> up at 10 GHz?
> > > >>
> > > >> Gedas, W8BYA EN70JT
> > > >>
> > > >> Gallery athttp://w8bya.com <http://w8bya.com> (under repair)
> > > >> Light travels faster than sound....
> > > >> This is why some people appear bright until you hear them
> speak.
> > > >>
> > > >>
> > > >> _______________________________________________
> > > >> Microwave mailing list
> > > >>
> > > >>
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