Coil identification

9/2/2010 5:56:43 AMMeyer

Hello all, suppose you have a unknown set of coils (oscillator and antenna) with three band capabitity, and you dont have the wiring diagram. Is there a method to identify the windings? Best regards, Meyer

9/2/2010 5:50:26 PMMitch

:Hello all, suppose you have a unknown set of coils (oscillator and antenna) with three band capabitity, and you dont have the wiring diagram. Is there a method to identify the windings? Best regards, Meyer
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Meyer

Do you have any info, model, part #, color code for wires, any resistive values? Can you get the tanks open for visiual? Do you know where the coils came from?
Perhaps with more info we can all find an answer for you.
This is a great Forum.
Mitch

9/3/2010 5:09:55 AMMeyer

I made this post because I have a bunch of coils in my junk box (dont have any info from where they was used), and I wonder if is there a method to identify their windings, frequency, primary, secondary, etc.
I read somewhere that this can be done using a Grid Dip Meter.

::Hello all, suppose you have a unknown set of coils (oscillator and antenna) with three band capabitity, and you dont have the wiring diagram. Is there a method to identify the windings? Best regards, Meyer
::
:Meyer
:
:Do you have any info, model, part #, color code for wires, any resistive values? Can you get the tanks open for visiual? Do you know where the coils came from?
:Perhaps with more info we can all find an answer for you.
:This is a great Forum.
:Mitch
:

9/2/2010 8:21:47 PMDoug Criner

The higher frequency coils will have fewer turns. Or you can measure the coil inductance with a meter.

9/2/2010 10:29:10 PMEdd

Sir Meyer. . . . . .

There is one whole bunch of qualifying info yet to be supplied.

Mo' bettah answer . . . .accompanying mo' bettah exploratory info.

Like . . . is this unit soooo ooooold that the coils are even wound on socketed plug in coil forms.

Or . . . . are the antenna / and / oscillator coils wound upon . . . possibly . . .a 3/4---1 inch wax impregnated cardboard / phenolic coil form with 3 windings side by side.

In either case, the lowest frequency of the three bands / coils will have the MOST turns on its largest winding. (Considering a much fewer turns, small tickler winding(s) possibly being involved.)

As far as which is oscillator coil / versus antenna coil you see if the loop antenna or (antenna connection on older units) is being routed into which coil, and that will be the antenna associated coil.

As far as the oscillator coil, check your tube used for the mixer or a separate oscillator tube and see which coils wiring is ending up routed to the 1st grid(s) circuitry of that tube.

Orrrrrrr, if you have a working receiver, switch to Broadcast band , tune in a station and put some thumb and index finger flesh around the larger coil winding, now, on the oscillator coil, that added capacitance should shift the tuning off from the station.

That coil cluster will be the oscillator coils for the three bands. Same procedure for the other bands, HOWEVER, acquiring reception on the shortwave spectrum seems to be picky, frequency and time related nowadays.

73's de Edd

:The higher frequency coils will have fewer turns. Or you can measure the coil inductance with a meter.
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9/3/2010 5:15:51 AMMeyer

Thanks you for your explanation Mr. Edd.
I'll do some experiences in this weekend in order to learn more about this matter.
Regards,
Meyer

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:Sir Meyer. . . . . .
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:There is one whole bunch of qualifying info yet to be supplied.
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:Mo' bettah answer . . . .accompanying mo' bettah exploratory info.
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:Like . . . is this unit soooo ooooold that the coils are even wound on socketed plug in coil forms.
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:Or . . . . are the antenna / and / oscillator coils wound upon . . . possibly . . .a 3/4---1 inch wax impregnated cardboard / phenolic coil form with 3 windings side by side.
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:In either case, the lowest frequency of the three bands / coils will have the MOST turns on its largest winding. (Considering a much fewer turns, small tickler winding(s) possibly being involved.)
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:As far as which is oscillator coil / versus antenna coil you see if the loop antenna or (antenna connection on older units) is being routed into which coil, and that will be the antenna associated coil.
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:As far as the oscillator coil, check your tube used for the mixer or a separate oscillator tube and see which coils wiring is ending up routed to the 1st grid(s) circuitry of that tube.
:
:
:Orrrrrrr, if you have a working receiver, switch to Broadcast band , tune in a station and put some thumb and index finger flesh around the larger coil winding, now, on the oscillator coil, that added capacitance should shift the tuning off from the station.
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:That coil cluster will be the oscillator coils for the three bands. Same procedure for the other bands, HOWEVER, acquiring reception on the shortwave spectrum seems to be picky, frequency and time related nowadays.
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:73's de Edd
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::The higher frequency coils will have fewer turns. Or you can measure the coil inductance with a meter.
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9/2/2010 10:29:11 PMEdd

Sir Meyer. . . . . .

There is one whole bunch of qualifying info yet to be supplied.

Mo' bettah answer . . . .accompanying mo' bettah exploratory info.

Like . . . is this unit soooo ooooold that the coils are even wound on socketed plug in coil forms.

Or . . . . are the antenna / and / oscillator coils wound upon . . . possibly . . .a 3/4---1 inch wax impregnated cardboard / phenolic coil form with 3 windings side by side.

In either case, the lowest frequency of the three bands / coils will have the MOST turns on its largest winding. (Considering a much fewer turns, small tickler winding(s) possibly being involved.)

As far as the oscillator coil, check your tube used for the mixer or a separate oscillator tube and see which coils wiring is ending up routed to the 1st grid(s) circuitry of that tube.

73's de Edd

:The higher frequency coils will have fewer turns. Or you can measure the coil inductance with a meter.
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9/3/2010 3:57:36 PMDoug Criner

Edd: I think that's what I said - except the opposite: the higher frequency coils have FEWER turns.

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:In either case, the lowest frequency of the three bands / coils will have the MOST turns on its largest winding. :
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:73's de Edd
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::The higher frequency coils will have fewer turns. Or you can measure the coil inductance with a meter.
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9/3/2010 4:42:04 PMEdd

Sir Doug . . . . .

Yep, agreed . . . its just my surmising that the greatest differentiation would be in the massive amount of windings on the BCB coils versus the comparatively more similar . . . two SW bands windings.

So that is why I chose the more readily apparent coil windings.

BUT . . .As for that being an apparent repetition of same info . . . . my usual procedure is to tune in . . . access any potential topics on laptop and store in Flash.

Then, later on, at a time available, to create a posted reply, then, it would be activated later on, when again being at Internet access.

My reply was poked up shortly after having seen the initial query of Poster / Date Time Group . . .Meyer 09/02/2010 05:56

After which, I had that relevant posted reply that you see, being ready by 06:05, but was not on Internet again until 22:29, at which time I 'jes let er rip . . . . . hiccupping . . . in fact, with a dub'l post, but I now see that the dupe responses have later been divided apart, by their added responses to them.

Thassit . . . .

73's de Edd

:Edd: I think that's what I said - except the opposite: the higher frequency coils have FEWER turns.
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::In either case, the lowest frequency of the three bands / coils will have the MOST turns on its largest winding. :
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::73's de Edd
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:::The higher frequency coils will have fewer turns. Or you can measure the coil inductance with a meter.
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