Am I wrong about this being the antenna. Could it be part of the local oscillator or could it be part of the rf tuning coil?
But…..but……BUT,BUT,BUT…we don’t know WHAT schematic to consult, nor even WHAT brand, model or chassis is even involved.
73's de Edd
:My console unit has a spider web coil in the back. It seems to be in reasonably good condition for being 70 years old. However the schematic doesn't show it if it is the antenna. It seems to only have a single wire shown. There are three wires coming from the spider web coil. I would assume it is tapped.
:Am I wrong about this being the antenna. Could it be part of the local oscillator or could it be part of the rf tuning coil?
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:But…..but……BUT,BUT,BUT…we don’t know WHAT schematic to consult, nor even WHAT brand, model or chassis is even involved.
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:73's de Edd
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::My console unit has a spider web coil in the back. It seems to be in reasonably good condition for being 70 years old. However the schematic doesn't show it if it is the antenna. It seems to only have a single wire shown. There are three wires coming from the spider web coil. I would assume it is tapped.
::Am I wrong about this being the antenna. Could it be part of the local oscillator or could it be part of the rf tuning coil?
Well….you have oh-fish-ully been felt out….if that unit is truly the 718 X series, then it should be quite a performer, what with 12 toobies, and resplendently complete with RF stages and two I.F. amplification stages on all bands, AND….electric push-a-ma-button tuning …no less. !
And then there is the provided, all important clarifying provision of “ Loop for broadcast band only” specification that the service info gives..
And I would certainly expect that loop to be of a standard minimal design…UNLESS… one tried upgrading the unit in the past by adding one of the custom built, larger square formed honeycomb –oak wood form-custom-hand wound-660 strand Litz wire wound unit that I see offered for BIG BUX.
Consulting the schema reveals the L-25 loop unit to be having its black and green leads ( if the colorization retained over the past years ! ) being the resonant portion of the loop in conjunction with the RF section of the tuning condenser, with the loops white /brown/trace wire to be the connection to the antenna via its low Z input coupling winding.
The unit shows sharing a common black wire for both coils, therefore the need for only 3 interconnect wires….just as you were seeing.
Could it be part of the local oscillator ?
Nope…not even related to or near the oscillator aspect of the set…
Or could it be part of the rf tuning coil ?
As was mentioned, its secondary resonates the 1st grid circuitry of the sets R.F. amplifier stage
73's de Edd
:I did that intentionally Double D. I put out a feeler just to see if anyone is even interested in answering. I hate writing long drawn out questions and then nobody answers. Its a model 718 Howard.
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::But…..but……BUT,BUT,BUT…we don’t know WHAT schematic to consult, nor even WHAT brand, model or chassis is even involved.
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::73's de Edd
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:::My console unit has a spider web coil in the back. It seems to be in reasonably good condition for being 70 years old. However the schematic doesn't show it if it is the antenna. It seems to only have a single wire shown. There are three wires coming from the spider web coil. I would assume it is tapped.
:::Am I wrong about this being the antenna. Could it be part of the local oscillator or could it be part of the rf tuning coil?
It should be an exceptional performer I thought also, though i do believe it is just a 718 and not a 718X.
It is three banded though with everything you mentioned, along with a tuning eye. I had a few other questions posted about it elsewhere because it is giving this noob quite a few headaches and I haven't even really done anything to it yet.
I will have more questions later.
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:Well….you have oh-fish-ully been felt out….if that unit is truly the 718 X series, then it should be quite a performer, what with 12 toobies, and resplendently complete with RF stages and two I.F. amplification stages on all bands, AND….electric push-a-ma-button tuning …no less. !
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:
:And then there is the provided, all important clarifying provision of “ Loop for broadcast band only” specification that the service info gives..
:
:
:And I would certainly expect that loop to be of a standard minimal design…UNLESS… one tried upgrading the unit in the past by adding one of the custom built, larger square formed honeycomb –oak wood form-custom-hand wound-660 strand Litz wire wound unit that I see offered for BIG BUX.
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:Consulting the schema reveals the L-25 loop unit to be having its black and green leads ( if the colorization retained over the past years ! ) being the resonant portion of the loop in conjunction with the RF section of the tuning condenser, with the loops white /brown/trace wire to be the connection to the antenna via its low Z input coupling winding.
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:The unit shows sharing a common black wire for both coils, therefore the need for only 3 interconnect wires….just as you were seeing.
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: Could it be part of the local oscillator ?
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:Nope…not even related to or near the oscillator aspect of the set…
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: Or could it be part of the rf tuning coil ?
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:As was mentioned, its secondary resonates the 1st grid circuitry of the sets R.F. amplifier stage
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:73's de Edd
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::I did that intentionally Double D. I put out a feeler just to see if anyone is even interested in answering. I hate writing long drawn out questions and then nobody answers. Its a model 718 Howard.
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:::But…..but……BUT,BUT,BUT…we don’t know WHAT schematic to consult, nor even WHAT brand, model or chassis is even involved.
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:::73's de Edd
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::::My console unit has a spider web coil in the back. It seems to be in reasonably good condition for being 70 years old. However the schematic doesn't show it if it is the antenna. It seems to only have a single wire shown. There are three wires coming from the spider web coil. I would assume it is tapped.
::::Am I wrong about this being the antenna. Could it be part of the local oscillator or could it be part of the rf tuning coil?