I want to build an LO

do not want to use Crystals, Frequency Synthesis, DDS, etc. Let's say 2 MHz and

following:

etc. No circuits to build. Just demo circuits for illustration, sometimes only the small signal model.

specific components. Very little on how to generalize things into different frequencies. (The ARRL handbook 2010 and Experimental Methods fall under this).

any S parameter files for the devices I'm interested in using.

The 1648 version is best for varicap/varactor tuning.

The modern integrated versions use a variable capacitor made from a CMOS structure, so the balanced version with L each side work better. ...Jim Thompson

do not want to use Crystals, Frequency Synthesis, DDS, etc. Let's say 2 MHz and

following:

etc. No circuits to build. Just demo circuits for illustration, sometimes only the small signal model.

specific components. Very little on how to generalize things into different frequencies. (The ARRL handbook 2010 and Experimental Methods fall under this).

any S parameter files for the devices I'm interested in using.

Jim's circuit has one end of the tank at RF ground, which can have advantages, like when using an asymmetric trimmer cap or a varicap. And it's easier to extract the output signal. Q is potentially higher, too, since it doesn't have those R things across the LC.

In the circuit above, the emitter voltage is at 2F! There must be a use for that somewhere.

Cheap MMICS make nice gain elements for oscillators. You can truly ground one side of the tank, and buffering is included for free.

do not want to use Crystals, Frequency Synthesis, DDS, etc. Let's say 2 MHz and

following:

IMD, etc. No circuits to build. Just demo circuits for illustration, sometimes only the small signal model.

specific components. Very little on how to generalize things into different frequencies. (The ARRL handbook 2010 and Experimental Methods fall under this).

any S parameter files for the devices I'm interested in using.

that

Yes, a similar scheme is used for clock doublers. The tricky part is controlling the main amplitude to optimize the doubling, because of a substantial temperature sensitivity.

I discovered that effect when I was barely out of college, as seen in my very first patent, issued when I was 25...

...Jim Thompson

do not want to use Crystals, Frequency Synthesis, DDS, etc. Let's say 2 MHz and

following:

IMD, etc. No circuits to build. Just demo circuits for illustration, sometimes only the small signal model.

specific components. Very little on how to generalize things into different frequencies. (The ARRL handbook 2010 and Experimental Methods fall under this).

any S parameter files for the devices I'm interested in using.

True. In the above circuit I had to use back-to-back varicaps to make a VCO. And the output is best processed differentially too, but this may not be an issue depending on the application.

Currently I am playing with another variation of this circuit, with transmission lines in place of the L/2 inductors. Trying to observe and find an use for the multiple natural resonant modes that arise. Perhaps injection locking at several frequencies...

Pere

that

It's

Get serious. We have AlwaysWrong. Sloman. Phyllis the cursing boom-box repair man. Thompson. Fields. I don't rate an Honorable Mention.

do not want to use Crystals, Frequency Synthesis, DDS, etc. Let's say 2 MHz and

following:

IMD, etc. No circuits to build. Just demo circuits for illustration, sometimes only the small signal model.

specific components. Very little on how to generalize things into different frequencies. (The ARRL handbook 2010 and Experimental Methods fall under this).

find any S parameter files for the devices I'm interested in using.

advantages,

have

Cool... like the ancient dual-triode "line oscillator." Those had modes, but the tube GBW was low enough that only the first one got through.

What was that cool apple-sized UHF dual triode? A have some somewhere around here...

Traditionally called "Dynamic Impedance at Resonance"

I didn't know it had a specific name ;-)

I just found the impedance method useful when designing, rather than just pulling some number out of the air, like 50 Ohms.... >:-} ...Jim Thompson

Western Electric 316A. Also knowns a the "door knob" tube. The oscillator schematic is also shown. Used in WWII IFF (identification friend foe) boxes and airborne RADAR sets. I had one on display in my office for many years, until some kid dropped it.

Actually, it was the 829 I was thinking about, a dual tetrode.

You could do a crossover type line oscillator with one of those.

Oops. I missed the dual part. What are you doing with so many 829A tubes? Were you considering designing one of them into a product? It might work if someone needed an EMP proof design.

There was also the 832A, which I used to work with in various really ancient mobile radios: Only a few old radios used free running oscillators at high power. Most had multiplier chains and a power amplifier.

Sitting on my messy shelf is an Amperex 6907 dual tetrode: which was used in some of the G.E Progress Line radios.

All this brings back fond nightmares from the thankfully distant past.

When I was a kid, all my disposable income went to Fair Radio Sales. WWII surplus was still glutting warehouses so tube gear was dirt cheap. CRTs, PMTs, transmitting tubes, klystrons, flashtubes, image intensifiers, radioactive stuff ...

I had two rooms full of high voltage mad-scientist gear. It's amazing I'm still alive.

Much the same except for the radioactive stuff. That came later. Add chemical experiments, rockets, and monster magnets. In Smog Angeles, it was JJ Glass Surplus, plus an assortment of industrial junk yards scattered from San Fernando Valley to Long Beach to Pomona. The only problem is that I liked the giant scrap yard look so much, that I decorated my home and office in much the same manner. I've considered growing up and adopting a more conventional life style, but at my age, it's unlikely to happen.

In the land mobile business in the LA and Orange County areas, we would kill off at least one technician each year from electrocution. The only time I got to see all the other techs were at funerals. I suspect that I owe my continued existence to an educational series of small electrocutions while I was young and before I graduated to the really big stuff that could kill me.

mixers. I do not want to use Crystals, Frequency Synthesis, DDS, etc. Let's say

the following:

noise, IMD, etc. No circuits to build. Just demo circuits for illustration, sometimes only the small signal model.

very specific components. Very little on how to generalize things into different frequencies. (The ARRL handbook 2010 and Experimental Methods fall under this).

find any S parameter files for the devices I'm interested in using.

wave.

It's

made

Hmmm, I see 2 buffoons. You should both get out more :-)

mixers. I do not want to use Crystals, Frequency Synthesis, DDS, etc. Let's say

the following:

noise, IMD, etc. No circuits to build. Just demo circuits for illustration, sometimes only the small signal model.

very specific components. Very little on how to generalize things into different frequencies. (The ARRL handbook 2010 and Experimental Methods fall under this).

can't find any S parameter files for the devices I'm interested in using.

wave.

discrimination! It's

made

I see multiple buffoons, and I'm not one of them >:-}

Stick to technology or go away. ...Jim Thompson

My worst experience was getting across the ends of a TV power transformer secondary. That literally left me shaking for a day or two. 18KV neon sign transformers are mild by comparison, because they current limit.

I also made a Kerr cell optical modulator, and got nitrobenzene all over me.

Then there was the time we found a shopping bag full of shotgun shells. Pounds of black powder!

mixers. I do not want to use Crystals, Frequency Synthesis, DDS, etc. Let's say

the following:

noise, IMD, etc. No circuits to build. Just demo circuits for illustration, sometimes only the small signal model.

very specific components. Very little on how to generalize things into different frequencies. (The ARRL handbook 2010 and Experimental Methods fall under this).

can't find any S parameter files for the devices I'm interested in using.

wave.

discrimination! It's

made

Review the thread. The two guys who went personal/insulting were JF and JT. Everybody else was talking about oscillators.

I had a couple 15E, and the 15R HV rectifiers from early aircraft RADAR. I still have the aluminum case from one of the receivers. It has a home brew battery charger that will put out up to 30A and uses a variac to set the charge current.

Dynamic?

--

John Larkin Highland Technology Inc

Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom timing and laser controllers Photonics and fiberoptic TTL data links VME analog, thermocouple, LVDT, synchro, tachometer Multichannel arbitrary waveform generators