Re: How to know there is a receiver or not when I am FM transmitter?

On Wed, 29 Mar 2006 21:46:05 -0800, "Joel Kolstad"
<JKolstad71HatesSpam@xxxxxxxxx> wrote:

Hi Wes,

"Wes Stewart" <n7ws*@*yahoo.com> wrote in message
news:72pm22l85qdp2d5paagr6m2h1iuvnltf6c@xxxxxxxxxx
On Wed, 29 Mar 2006 19:05:32 -0800, "Joel Kolstad"
<JKolstad71HatesSpam@xxxxxxxxx> wrote:
The above is the also the way that so-called "grid dip meters" work.
What do you mean, "so-called" grid dip meters?

I'm looking at the schematic for my Measurements Corp. Model 59 and
I'll be damned if there isn't a microammeter connected in the grid
return.

Haha... nice. :-) By the time I knew V=IR -- and probably by the time I was
born -- I don't think they made grid dippers that had Real Live Toobs in them
anymore...! :-)

Hi Joel,

I have two model 59's, which BTW are the best of the bunch.

Even when I was still employed and "my" lab had $250K worth of HP
network analyzers available, I had a model 59 rat holed away. I had
to hide it because Metrology couldn't "calibrate" it so to them it was
worthless and had to be surplused.

When I started in the business as an electronics tech, the first job I
worked was assembling Phoenix Missile i-f amplifiers from blueprints
and feeding back to the guy writing production assembly planning. At
the time (and a long time after) this was the most sophisticated
air-to-air missile ever built. It had a pair of cascode vacuum tubes
(Nuvistors) in each channel of the i-f amp and also used three
klystrons.

Fifteen years later I was the engineer responsible for introducing a
high power IMPATT diode klystron replacement into production and the
Nuvistors had long been replaced with FETs and Gunn effect oscillators
had replaced the two klystron oscillators. Time marches on.

I must admit with today's surface mount and hybrid stuff, it's pretty
hard to stuff a GDO coil into a circuit and measure resonances :-)

Wes


---Joel
(who was never, ever made to learn what the small signal model of a tube is,
although it was mentioned at some point that "they're pretty much like FETs,"
so stuck on an island with a few tubes but no transistors, I *might* still
have a shot at building a transmitter to call for help... at least if I can
get The Professor to build me that nuclear reactor first...)



.

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