[ARC5] Question on antenna relay BC442.

[J Mcvey via ARC5]

I found some pictures and drawings in the ARC-5 manual that suggest that T55 was an an air-wound coil on a ceramic form, not a torroid.Now the question is what was the spacing between the primary and secondary? Did they use this transformer to obtain a rough meter calibration via the coupling factor?? 
Does anyone have a picture of an original coil, or better yet the dimensions of diameter and the distance between the primary and secondary.
I measured the thermocouple resistance it was just about exactly 1 ohm. The ARC5 mean load resistance is about 5 ohms, so I suspect that the purpose of the the RF transformer may have been to reduce the effective series resistance with the low resistance antenna?My transmitters are going to be used with short wire antennas for which they were originally designed,  so I want the coupling to be as correct as possible.


     On Sunday, November 30, 2014 5:32 PM, Mike Morrow <kk5f at earthlink.net> wrote:
   

 
> There is no info on the turns ratio in the manual.
> Does anybody have a spare or know what the specs were...

The instruction book for the ARA/ATA system states:

T-55 RF current transformer assembly, 1 turn primary, 1 turn
secondary carefully coated with G.E. Co. Glyptal #1202.

A.R.C. part number 7501.

Mike / KK5F