G'day everyone,

A while ago I acquired a piece of equipment, a beacon transponder on
5480 MHz (TX). In it is a 'block' that seems to be the oscillator for
TX:

type nr. is 'VMC-1680'
made by Varian/beverly
date code 88236

the sizes of it are 35*55*31 mm; it's magnetic; the output is SMA.

There's a caution on it to keep it at least 4" away from magnets.
3 wires come out of it: red, black and grey. None of them seem to be
HV-rated, so my original guess of a Magnetron or Klystron seem to be
wrong.


I wonder if it's possible to use it for Ham-purposes (it seems
tunable, and the 5,7 GHz hamband is very nearby...)

Anyway, does anyone have ANY info on it? I.e., what IS it, freq.
range, power, inputs (voltages, currents), etc. A datasheet would be
VERY nice, if it exists... (I already contacted Varian/Eimac (CPII),
but nothing came up :-( )
Any help is GREATLY appreciated.


Sincerely,

Peter Dingemans,
The Netherlands.
NB: please also mail any replies to this group to me directly,
I try to regularly check this group, but
only have limited web access.

On 22 Jun 2004 06:11:10 -0700, (peter
dingemans) wrote:

G'day everyone,

A while ago I acquired a piece of equipment, a beacon transponder on
5480 MHz (TX). In it is a 'block' that seems to be the oscillator for
TX:

type nr. is 'VMC-1680'
made by Varian/beverly
date code 88236

the sizes of it are 35*55*31 mm; it's magnetic; the output is SMA.

There's a caution on it to keep it at least 4" away from magnets.
3 wires come out of it: red, black and grey. None of them seem to be
HV-rated, so my original guess of a Magnetron or Klystron seem to be
wrong.


I wonder if it's possible to use it for Ham-purposes (it seems
tunable, and the 5,7 GHz hamband is very nearby...)

If it's tunable it can't be a magnetron, anyway, surely? They resonate
at a fixed frequency determined by the mechanical cavities machined
into them.
--

"What is now proved was once only imagin'd." - William Blake, 1793.

Hi,

The device in question is possibly a YIG oscillator although
there aren't as many wires coming out of it as usual. For a
simple beacon source though (DC power and tuning coil current),
it may not have needed many more.

BTW - magnetrons are/were quite often tuneable.

Cheers - Joe

In article ,
Paul Burridge wrote:

If it's tunable it can't be a magnetron, anyway, surely? They resonate
at a fixed frequency determined by the mechanical cavities machined
into them.

Not true at all. There are a pile of different tuneable maggies that
were built for Military Uses, in all bands from C, S, clear up thru Ku.
It is just the civilian commercial maggies that are fixed tuned, because
the FCC, DOC, and other regulators don't want untrained operators
messing around with the tuning controls.

Bruce in alaska who used to be one of those regulators......
--
add a 2 before @

I have a Varian Reflex Klystron (NIB) has 4 wires 3 out the top one gray out
the bottom, with a window in the middle, (unit must drop through a hole in a
waveguide?) wires are thick. Takes 2 wires for heater, one for beam and one
for reflector (Varian V-152B)
Data sheet has 6.3V heater @1.15A Beam Voltage 250Vdc and Beam Current at
25ma, and reflector at 104Vdc. get a 5.5mW output at ?? frequancy. Varian
had a place in Palo Alto Tube Division of Varian Association.

heater wires are yellow, Cathode is green, body is brown and reflector is
gray(neg voltage too)

Also have a "Bomac BL820", same kind of wiring, but with a waveguide output,
tunable. NOS


Yours - Magnetic means it has a circulator in it, could be a type that gets
interrigated.
Magnetic - magnetron?
Some of the bricks take +15 and -12 small bias current, and
ground make 3 wires

Good luck - may be out there. I'm still looking for frequency info on "Bomac
BL820", and Varian V-152B




"peter dingemans" wrote in message
om...
G'day everyone,

A while ago I acquired a piece of equipment, a beacon transponder on
5480 MHz (TX). In it is a 'block' that seems to be the oscillator for
TX:

type nr. is 'VMC-1680'
made by Varian/beverly
date code 88236

the sizes of it are 35*55*31 mm; it's magnetic; the output is SMA.

There's a caution on it to keep it at least 4" away from magnets.
3 wires come out of it: red, black and grey. None of them seem to be
HV-rated, so my original guess of a Magnetron or Klystron seem to be
wrong.


I wonder if it's possible to use it for Ham-purposes (it seems
tunable, and the 5,7 GHz hamband is very nearby...)

Anyway, does anyone have ANY info on it? I.e., what IS it, freq.
range, power, inputs (voltages, currents), etc. A datasheet would be
VERY nice, if it exists... (I already contacted Varian/Eimac (CPII),
but nothing came up :-( )
Any help is GREATLY appreciated.


Sincerely,

Peter Dingemans,
The Netherlands.
NB: please also mail any replies to this group to me directly,
I try to regularly check this group, but
only have limited web access.

checkout http://www.tubecollector.org/