VFO Circuit using Space Charge Tube?

[David C. Hallam]

Mine dated to about 1952.  The receiver was commercial but you had to supply
the relay.  I think I used a Sigma 4F.  As I said the transmitter was HB.

> -----Original Message-----
> From: Boat Anchor Owners and Collectors List
> [mailto:BOATANCHORS at LISTS.TEMPE.GOV]On Behalf Of J Forster
> Sent: Wednesday, October 01, 2008 12:45 PM
> To: BOATANCHORS at LISTS.TEMPE.GOV
> Subject: Re: VFO Circuit using Space Charge Tube?
>
>
> I got mine in England in 1956. It was a commercial, then state of
> the art, unit.
>
> BTW, there is a video of the Raytheon subminiatiure tube
> manufacturing line at:
>
> http://techtv.mit.edu/file/1125/
>
> Best,
> -John
>
> ==============
>
> David C. Hallam wrote:
>
> > Hi,
> >
> > Mine was a little earlier than yours. As I remember, two tubes
> actuating a
> > sensitive relay to escapement type rudder only control with a
> long rubber
> > band running down the fuselage to turn the escapement.
> >
> > I built my own transmitter, single tube crystal controlled
> oscillator.  I
> > don't remember what tube I used but it must have been something from a
> > battery operated portable radio.  I suppose by the rules you weren't
> > supposed to do that on the Citizens Band.
> >
> > David
> > KC2JD/4
> >
> > > -----Original Message-----
> > > From: J Forster [mailto:jfor at quik.com]
> > > Sent: Wednesday, October 01, 2008 12:09 PM
> > > To: dhallam at rapidsys.com
> > > Cc: BOATANCHORS at LISTS.TEMPE.GOV
> > > Subject: Re: [BOATANCHORS-TEMPE] VFO Circuit using Space Charge Tube?
> > >
> > >
> > > Hi,
> > >
> > > The  was a Raytheon RK61. I have such a receiver. It used the
> > > tube in the front
> > > end, several OC-xx transistors in audio amp stages, a resonant
> > > multi-reed relay,
> > > controlling six tiny relays to run the actuators.  The
> > > transmitter was hybrid too.
> > >
> > > Best,
> > > -John
> > >
> > > ================
> > >
> > > David C. Hallam wrote:
> > >
> > > > Back in the early 1950's when I was messing around with model
> > > airplanes, we
> > > > used a subminiature gas tube in the receivers with a 22.5V
> > > battery for the
> > > > plate supply for RC airplanes.  As I recall they were made by
> > > Sylvania and
> > > > had originally been developed for use in WWII proximity
> fuses.  This was
> > > > back when the first Citizens Band had been authorized.  We used
> > > 27.255 MHz.
> > > > I think I still have some of the crystals around I used in the
> > > transmitters.
> > > >
> > > > David
> > > > KC2JD/4
>
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