What's the capacitance of variable capacitors found in clock-radios ?
I want to make a pizza-box antena and can't find 10-365pF.

Thank you.

"Warren" wrote in
:

What's the capacitance of variable capacitors found in clock-radios ?
I want to make a pizza-box antena and can't find 10-365pF.

Thank you.


It's not at all critical. Use whatever you have. All it will affect is the
tuning range.

donutbandit wrote:

"Warren" wrote in
:

What's the capacitance of variable capacitors found in clock-radios ?
I want to make a pizza-box antena and can't find 10-365pF.

Thank you.


It's not at all critical. Use whatever you have. All it will affect is the
tuning range.

This calculator http://www.mindspring.com/~loop_ante...loop_calc4.htm
needs the value of capacitance, so that I know how many turns I need to
wind up, as well as spacing, to cover AM band, tipically 530-1710kHz.

The tuning capacitor in standard AM broadcast radios is typically 365 PF.

Warren wrote:
donutbandit wrote:

"Warren" wrote in
:


What's the capacitance of variable capacitors found in clock-radios ?
I want to make a pizza-box antena and can't find 10-365pF.

Thank you.


It's not at all critical. Use whatever you have. All it will affect is the
tuning range.


This calculator http://www.mindspring.com/~loop_ante...loop_calc4.htm
needs the value of capacitance, so that I know how many turns I need to
wind up, as well as spacing, to cover AM band, tipically 530-1710kHz.

"donutbandit" wrote in message
...
"Warren" wrote in
:

What's the capacitance of variable capacitors found in clock-radios ?
I want to make a pizza-box antena and can't find 10-365pF.

Thank you.


It's not at all critical. Use whatever you have. All it will affect is the
tuning range.

Great answer- since all it effects is the tuning range, why not leave it out
entirely?

As others have commented, the "standard" capacity in older AM radios is
365pF and will be fine. Antique Electronic Supply sells them also.

Dale W4OP

"Dale Parfitt" wrote in
:

It's not at all critical. Use whatever you have. All it will affect
is the tuning range.

Great answer- since all it effects is the tuning range, why not leave
it out entirely?


That's a ridiculous response. Building a loop is not rocket science and is
largely done seat of pants. You wind some turns, put the capacitor
across it and see what it tunes. Then you add or subtract turns until you
get the result you want.

But since most people these days can't even check their own motor oil
without an instruction book, maybe I should take that into account.

BTW, the correct word is "affects."

"donutbandit" wrote in message
...
BTW, the correct word is "affects."

If you look them up, 'affect' and 'effect' are the same when used as a
verb..

"Brenda Ann" wrote in
:

If you look them up, 'affect' and 'effect' are the same when used as a
verb..

I did look them up. They are very similar, but not the same.

Affect is almost the precursor to effect. In fact, one of the definitions
of affect is "to cause an effect."

The only real way to use effect as a verb is something like "the new office
manager effected many changes."

Proper usage:

The heat affects me badly. (not effects)
Heat has a bad effect on me. (not affect)

I even see newspaper reporters screwing this one up.

End of off topic rant.

I am holding in my hot little hand, a air variable cap rated from 28pf to
468pf....I'd take $10 for it.

It's double ganged too....so it's like getting two air variable caps for the
price of one.

Let me know.


"Warren" wrote in message
...
What's the capacitance of variable capacitors found in clock-radios ?
I want to make a pizza-box antena and can't find 10-365pF.

Thank you.

Warren,

Take a look at the Loop Antennas eGroup at YAHOO !
http://groups.yahoo.com/group/loopantennas/

Check-Out the LINKS Section
http://groups.yahoo.com/group/loopantennas/links

There you will find a Folder: "Variable Tuning Capacitors".
In this folder are several Links to Suppliers of Variable
Tuning Capacitors that work well with must Box Loop Antennas.


~ RHF
..
..
= = = "Warren"
= = = wrote in message ...
What's the capacitance of variable capacitors found in clock-radios ?
I want to make a pizza-box antena and can't find 10-365pF.

Thank you.