VFO Circuit using Space Charge Tube?

[David C. Hallam]

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
> >
> > > -----Original Message-----
> > > From: Boat Anchor Owners and Collectors List
> > > [mailto:BOATANCHORS at LISTS.TEMPE.GOV]On Behalf Of kd4e
> > > Sent: Tuesday, September 30, 2008 8:24 PM
> > > To: BOATANCHORS at LISTS.TEMPE.GOV
> > > Subject: VFO Circuit using Space Charge Tube?
> > >
> > >
> > > Anyone have a good VFO circuit for a HF transmitter
> > > that uses a "Space Charge" or other 12vdc tube?
> > >
> > > I did a bunch of online research on Space Charge tubes,
> > > pencil tubes, and low voltage subminiature tubes.
> > >
> > > The closest thing was this 12vdc tube QRP transmitter
> > > using a 12AC6 crystal oscillator and a 12J8 buffer
> > > http://ja9ttt.homedns.org/hamf/myexp/12V_Tube_QRPp_Transmitter.html
> > >
> > > The Japanese-to-English translation is rough but from
> > > the schematic and text does anyone see any reason that
> > > this could not be converted to a multi-band HF VFO?
> > >
> > > Here are the other low-voltage tube links that I found:
> > > http://kd4e.com/pp.html
> > >
> > > --
> > >
> > > Thanks! & 73, doc, KD4E
>
>
>
>
>

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