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-   -   Homebrew PTO/VFO question. (https://www.radiobanter.com/homebrew/22853-homebrew-pto-vfo-question.html)

Brian April 20th 04 11:39 PM

I grabbed the Tin Ear docs too...I think I will try to build this little
receiver from my parts pile.

I need another receiver like I need a hole in the head but what the
heck...looks fun.




"J Shrum" wrote in message
...
Agreed!

Paul,
That tin ear is perfect... That is exactly the PTO I was looking for. I'll
give that one a shot.

Thanks for everyone...

KC9FFX
"Brian" wrote in message
nk.net...
I prefer building stuff out of my junk pile. I do get a greater feeling

of
satisfaction when I can dive into the pile on hand and build something

that
works.

It's more fun that way!

73




"J Shrum" wrote in message
...
Point taken.

But my goal at this point is to build w/ salvaged parts from my mound

of
junk...








J Shrum April 21st 04 03:13 AM

Brian,
Just by looking at that schematic, where would I stop building if I only
wanted the VFO to use on a simple transmitter?

I looked it over, and have a pretty good guess, but I'm not certain.

Thanks.

"Brian" wrote in message
nk.net...
I grabbed the Tin Ear docs too...I think I will try to build this little
receiver from my parts pile.

I need another receiver like I need a hole in the head but what the
heck...looks fun.




"J Shrum" wrote in message
...
Agreed!

Paul,
That tin ear is perfect... That is exactly the PTO I was looking for.

I'll
give that one a shot.

Thanks for everyone...

KC9FFX
"Brian" wrote in message
nk.net...
I prefer building stuff out of my junk pile. I do get a greater

feeling
of
satisfaction when I can dive into the pile on hand and build something

that
works.

It's more fun that way!

73




"J Shrum" wrote in message
...
Point taken.

But my goal at this point is to build w/ salvaged parts from my

mound
of
junk...










J Shrum April 21st 04 03:13 AM

Brian,
Just by looking at that schematic, where would I stop building if I only
wanted the VFO to use on a simple transmitter?

I looked it over, and have a pretty good guess, but I'm not certain.

Thanks.

"Brian" wrote in message
nk.net...
I grabbed the Tin Ear docs too...I think I will try to build this little
receiver from my parts pile.

I need another receiver like I need a hole in the head but what the
heck...looks fun.




"J Shrum" wrote in message
...
Agreed!

Paul,
That tin ear is perfect... That is exactly the PTO I was looking for.

I'll
give that one a shot.

Thanks for everyone...

KC9FFX
"Brian" wrote in message
nk.net...
I prefer building stuff out of my junk pile. I do get a greater

feeling
of
satisfaction when I can dive into the pile on hand and build something

that
works.

It's more fun that way!

73




"J Shrum" wrote in message
...
Point taken.

But my goal at this point is to build w/ salvaged parts from my

mound
of
junk...










Brian April 22nd 04 12:21 AM

James,

I printed out the docs today....lemme look at it.

Good question...


"J Shrum" wrote in message
...
Brian,
Just by looking at that schematic, where would I stop building if I only
wanted the VFO to use on a simple transmitter?

I looked it over, and have a pretty good guess, but I'm not certain.

Thanks.

"Brian" wrote in message
nk.net...
I grabbed the Tin Ear docs too...I think I will try to build this little
receiver from my parts pile.

I need another receiver like I need a hole in the head but what the
heck...looks fun.




"J Shrum" wrote in message
...
Agreed!

Paul,
That tin ear is perfect... That is exactly the PTO I was looking for.

I'll
give that one a shot.

Thanks for everyone...

KC9FFX
"Brian" wrote in message
nk.net...
I prefer building stuff out of my junk pile. I do get a greater

feeling
of
satisfaction when I can dive into the pile on hand and build

something
that
works.

It's more fun that way!

73




"J Shrum" wrote in message
...
Point taken.

But my goal at this point is to build w/ salvaged parts from my

mound
of
junk...












Brian April 22nd 04 12:21 AM

James,

I printed out the docs today....lemme look at it.

Good question...


"J Shrum" wrote in message
...
Brian,
Just by looking at that schematic, where would I stop building if I only
wanted the VFO to use on a simple transmitter?

I looked it over, and have a pretty good guess, but I'm not certain.

Thanks.

"Brian" wrote in message
nk.net...
I grabbed the Tin Ear docs too...I think I will try to build this little
receiver from my parts pile.

I need another receiver like I need a hole in the head but what the
heck...looks fun.




"J Shrum" wrote in message
...
Agreed!

Paul,
That tin ear is perfect... That is exactly the PTO I was looking for.

I'll
give that one a shot.

Thanks for everyone...

KC9FFX
"Brian" wrote in message
nk.net...
I prefer building stuff out of my junk pile. I do get a greater

feeling
of
satisfaction when I can dive into the pile on hand and build

something
that
works.

It's more fun that way!

73




"J Shrum" wrote in message
...
Point taken.

But my goal at this point is to build w/ salvaged parts from my

mound
of
junk...












mcalhoun April 24th 04 04:12 AM

Just by looking at that schematic, where would I stop building if I only
wanted the VFO to use on a simple transmitter?
I looked it over, and have a pretty good guess, but I'm not certain.


IMHO, it to me as if:
Q1 is the local oscillator VFO
Q2 is the mixer (it's the only xstr that gets anything from Q1;
because of capacitors C9 and C10, the bottom end of R3 and the
bottom end of Q3 are essentially at ground potential to RF)
Q3 is the RF amplifier
Q4 is the AF amplifier
Qrest are elements of a push-pull AF output amplifier

--Myron A. Calhoun, W0PBV.
--
Five boxes preserve our freedoms: soap, ballot, witness, jury, and cartridge
PhD EE (retired). "Barbershop" tenor. CDL(PTXS). W0PBV. (785) 539-4448
NRA Life Member and Certified Instructor (Home Firearm Safety, Rifle, Pistol)

mcalhoun April 24th 04 04:12 AM

Just by looking at that schematic, where would I stop building if I only
wanted the VFO to use on a simple transmitter?
I looked it over, and have a pretty good guess, but I'm not certain.


IMHO, it to me as if:
Q1 is the local oscillator VFO
Q2 is the mixer (it's the only xstr that gets anything from Q1;
because of capacitors C9 and C10, the bottom end of R3 and the
bottom end of Q3 are essentially at ground potential to RF)
Q3 is the RF amplifier
Q4 is the AF amplifier
Qrest are elements of a push-pull AF output amplifier

--Myron A. Calhoun, W0PBV.
--
Five boxes preserve our freedoms: soap, ballot, witness, jury, and cartridge
PhD EE (retired). "Barbershop" tenor. CDL(PTXS). W0PBV. (785) 539-4448
NRA Life Member and Certified Instructor (Home Firearm Safety, Rifle, Pistol)

Uncle Peter April 25th 04 02:17 AM


"Brian" wrote in message
nk.net...
I prefer building stuff out of my junk pile. I do get a greater feeling of
satisfaction when I can dive into the pile on hand and build something

that
works.

It's more fun that way!

73



Cheaper, too. There's three dollars worth of parts there.



Uncle Peter April 25th 04 02:17 AM


"Brian" wrote in message
nk.net...
I prefer building stuff out of my junk pile. I do get a greater feeling of
satisfaction when I can dive into the pile on hand and build something

that
works.

It's more fun that way!

73



Cheaper, too. There's three dollars worth of parts there.




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