[10gigs] [Mw] [Midwest-Microwave] Fw: Siemens TWT - Model RW 289
w5lua at sbcglobal.net
w5lua at sbcglobal.net
Thu Apr 22 14:06:29 CDT 2021
Hello Gedas
I guess I forgot that I wrote that up. Thanks for the reminder.
I guess age is catching up with me.
73
Al W5LUA
-----Original Message-----
From: Microwave <microwave-bounces at mailmanlists.us> On Behalf Of Gedas via Microwave
Sent: Thursday, April 22, 2021 12:10 PM
To: Midwest-Microwave at groups.io
Cc: Gedas <w8bya at mchsi.com>; 10gigs at www.chris.org; Microwave List <microwave at mailmanlists.us>; 10ghz-up at groups.io
Subject: Re: [Mw] [Midwest-Microwave] Fw: Siemens TWT - Model RW 289
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.
"Hello NTMS
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.
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.
I did not use the input and output filters and just connected directly
to the TWT input and output.
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.
Find the following color coded wires and connect accordingly
Ground (0VDC)
Small brown
large green white
large orange white
Negative 24 VDC (-24V to -48V)
Large green
Large orange
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)
PTT keying is accomplished by wiring a relay across the Standby / On
switch (next to the power switch.) Open is Standby, Closed is On.
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!
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).
The Yellow alarm light should not illuminate when driving the tube. You
may have to adjust the helix voltage to keep everything within tolerance.
Good luck
73
Al W5LUA
Additional comments by N5PYK
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."
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 9:03 PM, Gedas wrote:
>
> Awesome information Dave, thank you very much !!!! 73
>
> Gedas, W8BYA EN70JT
>
> Gallery athttp://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>
>> Date: 4/21/21 19:53 (GMT-05:00)
>> To: Brian Yee <brian.w6by at gmail.com>
>> Cc: Steven Kerns <n3fti at yahoo.com>, Microwave List
>> <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 (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>> 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>>
>> > > 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>>To:Midwest-Microwave at groups.io
>> > <mailto:To%3AMidwest-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>>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>> 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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>> > >>
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>> >
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