Wireless set 19 coax modern subtitute
 

Gents,

What is the proper and available substitute to make Wireless set 19 coax cables ?

I plan to built several coax cables for my 19 set using the original Pye coax connectors.

Your assistance would be greatly appreciated.

Kind regards.

Daniel

The problem here (one of the many problems) is that nearly 80 years have passed since the original cable was devised, plus the connectors were intended as a "quick disconnect" for equipment replacement and have no designed impedance, and you can then add in production changes and metrication to the mix.

As a starting point, I'd suggest Uniradio 67 (RG-213), but be warned that the dimensions have changed over the years and it's no longer 0.45" o.d. but 0.405" and you may need to sleeve it with tape.

I'll have a further rummage and see if I can find a better match, but one may no longer exist.

Chris.

Thank you Chris !

WS #19 RF cables impedance.
 

Daniel, use RG-11 coax.
I measured the dimensions of the original coax that fitted the Pye connectors many years ago and that gave 75 ohms of impedance.
And, a RG-11 coax have the same dimensions as the original ones.
RG-8 can be used also, as the lines are too short to represent any mismatch.
Variation in cables capacitance will be balanced by the variometer anyways.

"As a starting point, I'd suggest Uniradio 67 (RG-213), but be warned that the dimensions have changed over the years and it's no longer 0.45" o.d. but 0.405" and you may need to sleeve it with tape."


"RG-11 coax have the same dimensions as the original ones."


One source I looked at also gave RG-11 as having an OD of .405". Would heat shrink tube be a better material for packing the smaller wires out to the 0.45" dimension? I would think the adhesive lined version (maybe the unlined version too) should stay in place better than tape if the cable is moved about.


According to answers.com - RG-11/U is 75ohm and is usually triple/quad shielded and typically has a maximum attenuation of 3.65. RG-213/U is common form amateur radio and is 50 ohms and is single shielded with about a 5.95 attenuation.
I don't know anywhere near enough about the subject to be able tell what this might do if you are looking for a functional as opposed to cosmetic substitute.