Arvin Hopalong Cassidy (440T?) Radio deteriorated Antennal coil.

1/5/2010 9:40:00 PMDave Froehlich

Hello All,
I'm wondering how many turns of magnet wire are in the primary and secondary. When I first saw this radio I wondered what all that "wooly" stuff was on the antenna coil. Well the wire had oxidized and fell apart. There's very little left of the coil closer to the speaker frame, and just about none of the other coil. I could re-wind it if I can find my magnet wire. But I wonder how many turns it takes, or does it really matter?
This radio receives local stations with a short length of wire and a hand to touch the chassis. So it reminds me of the loop antenna on the back of some radios. Only, this one is much smaller and has what looks like a ferrite core.
What should I do?

Thanks,

Dave

1/6/2010 2:44:58 AMWarren

I know what you are saying about those antenna coils on little Arvin 4 tube sets. That same antenna coil can be found in just about any other 4 tube radio. I just replaced one awhile ago on a Silvertone. The donor parts set was an Arvin. It is not ferrite, just ceramic. Don't think it's very practical to try re-winding. The wire is thin and wound in a zig-zag way.

1/13/2010 12:41:49 PMDave Froehlich

Warren,
It's more like a short piece of a wooden dowel painted black, with a treaded rod screwed into it so it can attach to the speaker. This dowel piece is glued inside the antenna coil form.

Dave
:I know what you are saying about those antenna coils on little Arvin 4 tube sets. That same antenna coil can be found in just about any other 4 tube radio. I just replaced one awhile ago on a Silvertone. The donor parts set was an Arvin. It is not ferrite, just ceramic. Don't think it's very practical to try re-winding. The wire is thin and wound in a zig-zag way.
:

1/13/2010 2:01:20 PMWarren

Yes, that's right. Some were like that. Right now I am playing an Arvin 442. It has the antenna coil just as you say. The other little Arvin was a 422. That one had a ceramic coil form. Same fit & interchangeable.

1/13/2010 2:43:12 PMEdd

Sir Dave. . . . . .

I remember having that 4 banger "ARVIN " chassis in a Silvertone unit back at Jr High times and , it being
the same situation on the antenna coil with a supplied 25 ft hank of HEAVY double cotton covered wire
wired to that ant coils input link.

That "short cut" set is considered to be a "Mertropolitan" receiver.

Also, my set was in a metal cabinet, don't know about your set, cause if that was my situation to solve now,
AND having a PLASTIC / BAKELITE cabinet , I would be installing a Ferri loop bar inside the cabinet.

If having to go with the antenna coil, I would be pulling out an old large size I.F. transformer and cutting the
center of the coil form to get the top winding and then use dowel mounting (assuredly smaller dowel size) in
the same manner as the other was and adding a self wound link coil aside the main coil for ext aerial wire input coupling.

Initially you would have the I.F. coil connected up "naked" so that you can then take the external end of the winding and
then start skirreling off turns UNTIL you hit optimal signal at weak station 1400-1600 on the dial.

After all is optimized, candle wax or parrafin wax the ouside of the winding.

Thassit.

73's de Edd

:Yes, that's right. Some were like that. Right now I am playing an Arvin 442. It has the antenna coil just as you say. The other little Arvin was a 422. That one had a ceramic coil form. Same fit & interchangeable.
:

1/13/2010 5:37:46 PMTerry Decker

:Hello All,
: I'm wondering how many turns of magnet wire are in the primary and secondary. When I first saw this radio I wondered what all that "wooly" stuff was on the antenna coil. Well the wire had oxidized and fell apart. There's very little left of the coil closer to the speaker frame, and just about none of the other coil. I could re-wind it if I can find my magnet wire. But I wonder how many turns it takes, or does it really matter?
: This radio receives local stations with a short length of wire and a hand to touch the chassis. So it reminds me of the loop antenna on the back of some radios. Only, this one is much smaller and has what looks like a ferrite core.
: What should I do?
:
:Thanks,
:
:Dave
:
You might check out AES if you want to buy one instead of winding it yourself. They have a few antenna coils, and ferrite rods for do it yourself.
Terry

1/13/2010 8:39:41 PMDave Froehlich

Terry,
I have already done this. I just received it today.

Thanks,

Dave
::Hello All,
:: I'm wondering how many turns of magnet wire are in the primary and secondary. When I first saw this radio I wondered what all that "wooly" stuff was on the antenna coil. Well the wire had oxidized and fell apart. There's very little left of the coil closer to the speaker frame, and just about none of the other coil. I could re-wind it if I can find my magnet wire. But I wonder how many turns it takes, or does it really matter?
:: This radio receives local stations with a short length of wire and a hand to touch the chassis. So it reminds me of the loop antenna on the back of some radios. Only, this one is much smaller and has what looks like a ferrite core.
:: What should I do?
::
::Thanks,
::
::Dave
::
:
:Hi Dave-
:You might check out AES if you want to buy one instead of winding it yourself. They have a few antenna coils, and ferrite rods for do it yourself.
:Terry
:

1/13/2010 9:11:58 PMTerry Decker

:Terry,
: I have already done this. I just received it today.
:
:Thanks,

Cool!
:
:Dave
:::Hello All,
::: I'm wondering how many turns of magnet wire are in the primary and secondary. When I first saw this radio I wondered what all that "wooly" stuff was on the antenna coil. Well the wire had oxidized and fell apart. There's very little left of the coil closer to the speaker frame, and just about none of the other coil. I could re-wind it if I can find my magnet wire. But I wonder how many turns it takes, or does it really matter?
::: This radio receives local stations with a short length of wire and a hand to touch the chassis. So it reminds me of the loop antenna on the back of some radios. Only, this one is much smaller and has what looks like a ferrite core.
::: What should I do?
:::
:::Thanks,
:::
:::Dave
:::
::
::Hi Dave-
::You might check out AES if you want to buy one instead of winding it yourself. They have a few antenna coils, and ferrite rods for do it yourself.
::Terry
::
: