firestone: Firestone Firechief S-7428-2 antenna

I am restoring a Firestone Firechief S-7428-2 MW radio. The schematic reflects a loop antenna or a long wire antenna. The unit I am working on is reflective a long wire antenna. My question is; the schematic does not show capacitor number 2 or resistor number 2 and installed components reflects same. Can someone be of some help here as to why? Was there a modification made not reflected on schematic? Or; is the long wire model different in the sense it does not require these two components? Thank you

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Dear Charles, I do not see in the diagram any numbering of capacitors or resistors. Can you explain e.g. the position or the values in ohms and capacity of the two components. Regards

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I have attached 2 schematics showing the capacitors and resistors. 1 with long wire antenna.

Attachments:

• s-7428-2 Firestone Firechief schematic showing capacitor and resistors (1275 KB)
• s-7428-2 Firestone Firechief radio schematic showing long wire antenna (291 KB)

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Dear Charles

The R2 resistor must be there, it is just not shown in the small part-diagram. It is part of the AVC. Without the resistor the AVC would not work.

The C2 is a very low capacitor, 25pf only. It will compensate the little different inductive of the of the input RF-transformer compared to the loop antenna, what also works as a RF-transformer.

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Thank you for your input.

I did notice the C2 was evident on the schematic with loop antenna and not shown on the long wire antenna schematic, however I am searching for the R2 not shown on either schematic.

 

Today I will go over both with fine comb again to determine where it my be represented.

 

I have already replaced the capacitors and resistors on the chassis with the exception of the C2 and R2 which do not exist on the chassis or schematic.

 

Hmmm

 

Thank you once again for your input.

 

Charles

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