Coil identifying

4/26/2011 5:08:05 AMMeyer

Assume that you have a bunch of oscillator and antenna coils collected through the years.
My question is: for example I pick up an oscillator coil and want to map the MW primary/secondary windings and same for the SW section. Is there a simple way to do this? I mean without use of sofisticated gear like grid dip meters or something? just with a ohm meter?

Cheers,

Meyer Very Happy

4/26/2011 10:12:22 PMJohnnysan

:Assume that you have a bunch of oscillator and antenna coils collected through the years.
:My question is: for example I pick up an oscillator coil and want to map the MW primary/secondary windings and same for the SW section. Is there a simple way to do this? I mean without use of sofisticated gear like grid dip meters or something? just with a ohm meter?
:
:Cheers,
:
:Meyer Very Happy
:

No.
johnnysan-

4/26/2011 10:33:44 PMThomas Dermody

The short wave coils are typically lower in resistance than the medium wave coils, but there are no guarantees on this.

If you could count the turns on the short wave coil, you could possibly calculate its inductance and estimate where it would tune with a given capacitance. Medium wave coils are a bit more difficult to count the windings on, especially if layer-wound.

4/27/2011 5:03:40 AMMeyer

I'll try to build a "coil test station" using a junk chassis. Then I can install my coils on it and make practical experiences to find out their windings.

:The short wave coils are typically lower in resistance than the medium wave coils, but there are no guarantees on this.
:
:If you could count the turns on the short wave coil, you could possibly calculate its inductance and estimate where it would tune with a given capacitance. Medium wave coils are a bit more difficult to count the windings on, especially if layer-wound.
:
:T.
:

4/27/2011 2:36:48 PMThomas Dermody

Keep in mind that some short wave coils will have series capacitance added in the particular set they are used in, and some broadcast coils will have this added as well, usually as an adjustable padder capacitor, so frequency ranges might not pan out quite as you expect.

7/6/2011 3:39:35 PMMemory of Caylee

LETS FACE IT. CASEY ANTHONY HAD SOMETHING TO DO WITH THE DEATH OF HER DAUGHTER BUT WALKED AWAY FREE LIKE O.J.

MAY GOD HAVE MERCY ON THAT POOR LITTLE SOUL TAKEN WAY TOO EARLY.

AND MAY HE SEND HER TO ETERNAL DAMNATION ON THE JUDGEMENT DAY.

:I'll try to build a "coil test station" using a junk chassis. Then I can install my coils on it and make practical experiences to find out their windings.
:
::The short wave coils are typically lower in resistance than the medium wave coils, but there are no guarantees on this.
::
::If you could count the turns on the short wave coil, you could possibly calculate its inductance and estimate where it would tune with a given capacitance. Medium wave coils are a bit more difficult to count the windings on, especially if layer-wound.
::
::T.
::
:
: