Hi,

I'm trying to track down the name for a certain type of oscillator
which I dimly recall seeing in an old book called Radio & Line
Transmission that I bought and lost over 3 decades ago.
In simple terms, it has a crystal in the base/emitter circuit and a
C/L tank for the resonant frequency of the crystal in the collector
circuit. In this way it can't flip into an overtone since it only has
gain at the crystal's fundamental. Anyone know the name for it?

Thanks,

p.

--

The BBC: Licensed at public expense to spread lies.

"Paul Burridge" wrote in message
news

Hi,

I'm trying to track down the name for a certain type of oscillator
which I dimly recall seeing in an old book called Radio & Line
Transmission that I bought and lost over 3 decades ago.
In simple terms, it has a crystal in the base/emitter circuit and a
C/L tank for the resonant frequency of the crystal in the collector
circuit. In this way it can't flip into an overtone since it only has
gain at the crystal's fundamental. Anyone know the name for it?

Why don't you think the crystal goes low impedance at it's odd harmonics? If
you'll design the circuit properly, it will give no trouble with overtone
operation. Don't remember ever having any problems selecting one to operate
on the fundamental, usually, it's selecting between 5th and 7th overtone or
7th and 9th that gets a little sticky.

W4ZCB

In article lXI_b.395225$na.763604@attbi_s04, Harold E. Johnson
writes

"Paul Burridge" wrote in message
news

Hi,

I'm trying to track down the name for a certain type of oscillator
which I dimly recall seeing in an old book called Radio & Line
Transmission that I bought and lost over 3 decades ago.
In simple terms, it has a crystal in the base/emitter circuit and a
C/L tank for the resonant frequency of the crystal in the collector
circuit. In this way it can't flip into an overtone since it only has
gain at the crystal's fundamental. Anyone know the name for it?

Why don't you think the crystal goes low impedance at it's odd harmonics? If
you'll design the circuit properly, it will give no trouble with overtone
operation. Don't remember ever having any problems selecting one to operate
on the fundamental, usually, it's selecting between 5th and 7th overtone or
7th and 9th that gets a little sticky.

W4ZCB


A universal series resonant circuit "Butler?" meets most of your
criteria. I dont like these names myself. Collector to +ve supply via
tank LC with the C = 2 C in series the base decoupled to ground with a
potential divider to set base bias and a low value (220R?) in the
emitter to ground.
The crystal goes from the junction of the 2 tapped capacitors and the
emitter. The 2 Cs are arranged to lower the o/p impedance from the
collector tank i.e. the C nearest the collector would be 100pF and the C
to the +ve supply 330pF. With the LC arranged to resonate at the crystal
frequency.
The beauty of the circuit is that the crystal can be replaced by a 50R
resistor and the circuit L and C tweaked to oscillate at the crystal
freq. Can be used to select overtone or fundamental.

--
ddwyer

In article lXI_b.395225$na.763604@attbi_s04, Harold E. Johnson
writes

"Paul Burridge" wrote in message
news

Hi,

I'm trying to track down the name for a certain type of oscillator
which I dimly recall seeing in an old book called Radio & Line
Transmission that I bought and lost over 3 decades ago.
In simple terms, it has a crystal in the base/emitter circuit and a
C/L tank for the resonant frequency of the crystal in the collector
circuit. In this way it can't flip into an overtone since it only has
gain at the crystal's fundamental. Anyone know the name for it?

Why don't you think the crystal goes low impedance at it's odd harmonics? If
you'll design the circuit properly, it will give no trouble with overtone
operation. Don't remember ever having any problems selecting one to operate
on the fundamental, usually, it's selecting between 5th and 7th overtone or
7th and 9th that gets a little sticky.

W4ZCB


A universal series resonant circuit "Butler?" meets most of your
criteria. I dont like these names myself. Collector to +ve supply via
tank LC with the C = 2 C in series the base decoupled to ground with a
potential divider to set base bias and a low value (220R?) in the
emitter to ground.
The crystal goes from the junction of the 2 tapped capacitors and the
emitter. The 2 Cs are arranged to lower the o/p impedance from the
collector tank i.e. the C nearest the collector would be 100pF and the C
to the +ve supply 330pF. With the LC arranged to resonate at the crystal
frequency.
The beauty of the circuit is that the crystal can be replaced by a 50R
resistor and the circuit L and C tweaked to oscillate at the crystal
freq. Can be used to select overtone or fundamental.

--
ddwyer

Found a source for 7360 and it is some interest among my friends for
using this tube in HF receivers, particularly for 80 and 40m
It was mentioned an article by W2PUL(?) in QST using a high current
twin triode as RF amplifier.
Have seen the SSR-1 rx schematics. Is some more notes available on
some sites for a modern version of receiver using these devices? I
suspect some parts of the receiver could be improved over the practice
used in the 60's
Any suggestions?

73
----
Jan-Martin, LA8AK, N-4623 Kristiansand
http://home.online.no/~la8ak/

"Jan-Martin Noeding, LA8AK" ) writes:
Found a source for 7360 and it is some interest among my friends for
using this tube in HF receivers, particularly for 80 and 40m
It was mentioned an article by W2PUL(?) in QST using a high current
twin triode as RF amplifier.
Have seen the SSR-1 rx schematics. Is some more notes available on
some sites for a modern version of receiver using these devices? I
suspect some parts of the receiver could be improved over the practice
used in the 60's
Any suggestions?

The latest article I can think of seeing in print was February 1972.
I may have the date wrong. It was by one of the QST staff members
but not Doug DeMaw; I want to say Doug Blakeslee.

It was a 3.5MHz receiver with a 455KHz design, hardly cutting edge.
But it was intended for strong signal handling, so he used a tube
in the RF stage that had higher current handling. He half jokingly
suggested using an 807 in that stage.

A lot of those articles using the 7360 used no RF stage, which is
why you often saw a signal frequency Q-multiplier, to aid in image
recection. Of course, by the time the 7360 was put to use, HF range
IF filters were available so many of the receivers used an IF in
the 5 or 9MHz range.

Ray Moore had some articles in Ham Radio in 1972 and 1973 about
receiver design, and the introductory piece covered mixers including
the 7360, and then he had a "construction" article on a fancy AM
BCB receiver, that used a 7360.

Maybe some work was done with the mixer after that, but it pretty much
faded from view from that point on.

Michael VE2BVW

"Michael Black" wrote in message
...
"Jan-Martin Noeding, LA8AK" ) writes:
Found a source for 7360 and it is some interest among my friends for
using this tube in HF receivers, particularly for 80 and 40m
It was mentioned an article by W2PUL(?) in QST using a high current
twin triode as RF amplifier.
Have seen the SSR-1 rx schematics. Is some more notes available on
some sites for a modern version of receiver using these devices? I
suspect some parts of the receiver could be improved over the practice
used in the 60's
Any suggestions?

A couple, With Colin Horrabin's "H" mode mixer and the later switch mode
mixers available for well under a buck, the mixer has been removed from
being the concern it once was in receiver design. Since that topology, and
the 4066/312X/500X solid state mixers yield better linearity than the
following filters do, why return to the 7360? It was a fine mixer in it's
day. That day is LONG past. Try operating a 7360 in any close proximity to a
flourescent ballast. It will quickly disallusion you as to it's relative
worth except as a curiosity. Vacuum tube receiver technology and modern is
an oxymoron.

W4ZCB

"Michael Black" wrote in message
...
"Jan-Martin Noeding, LA8AK" ) writes:
Found a source for 7360 and it is some interest among my friends for
using this tube in HF receivers, particularly for 80 and 40m
It was mentioned an article by W2PUL(?) in QST using a high current
twin triode as RF amplifier.
Have seen the SSR-1 rx schematics. Is some more notes available on
some sites for a modern version of receiver using these devices? I
suspect some parts of the receiver could be improved over the practice
used in the 60's
Any suggestions?

A couple, With Colin Horrabin's "H" mode mixer and the later switch mode
mixers available for well under a buck, the mixer has been removed from
being the concern it once was in receiver design. Since that topology, and
the 4066/312X/500X solid state mixers yield better linearity than the
following filters do, why return to the 7360? It was a fine mixer in it's
day. That day is LONG past. Try operating a 7360 in any close proximity to a
flourescent ballast. It will quickly disallusion you as to it's relative
worth except as a curiosity. Vacuum tube receiver technology and modern is
an oxymoron.

W4ZCB

"Jan-Martin Noeding, LA8AK" ) writes:
Found a source for 7360 and it is some interest among my friends for
using this tube in HF receivers, particularly for 80 and 40m
It was mentioned an article by W2PUL(?) in QST using a high current
twin triode as RF amplifier.
Have seen the SSR-1 rx schematics. Is some more notes available on
some sites for a modern version of receiver using these devices? I
suspect some parts of the receiver could be improved over the practice
used in the 60's
Any suggestions?

The latest article I can think of seeing in print was February 1972.
I may have the date wrong. It was by one of the QST staff members
but not Doug DeMaw; I want to say Doug Blakeslee.

It was a 3.5MHz receiver with a 455KHz design, hardly cutting edge.
But it was intended for strong signal handling, so he used a tube
in the RF stage that had higher current handling. He half jokingly
suggested using an 807 in that stage.

A lot of those articles using the 7360 used no RF stage, which is
why you often saw a signal frequency Q-multiplier, to aid in image
recection. Of course, by the time the 7360 was put to use, HF range
IF filters were available so many of the receivers used an IF in
the 5 or 9MHz range.

Ray Moore had some articles in Ham Radio in 1972 and 1973 about
receiver design, and the introductory piece covered mixers including
the 7360, and then he had a "construction" article on a fancy AM
BCB receiver, that used a 7360.

Maybe some work was done with the mixer after that, but it pretty much
faded from view from that point on.

Michael VE2BVW

Found a source for 7360 and it is some interest among my friends for
using this tube in HF receivers, particularly for 80 and 40m
It was mentioned an article by W2PUL(?) in QST using a high current
twin triode as RF amplifier.
Have seen the SSR-1 rx schematics. Is some more notes available on
some sites for a modern version of receiver using these devices? I
suspect some parts of the receiver could be improved over the practice
used in the 60's
Any suggestions?

73
----
Jan-Martin, LA8AK, N-4623 Kristiansand
http://home.online.no/~la8ak/