Michael (G8MOB) wrote:
I may be able to help.
I Googled Niphan sockets and they seem to resemble old fashioned bright metal power sockets found on caravans and trailers. I may have the wrong Niphan!
No, those are the right ones, as used on Signals batteries during WW2 and afterwards, but with a single central pin instead of two dissimilar ones for LT supplies.
Inside the D11 wagons, the antenna connections from the transmitter to the dummy load and VSWR meter were the coarse thread Plessey type coaxial connectors.
I thought they were the fine thread aluminium alloy type? Certainly I found a couple at Beltring for someone and they were well pleased with the purchase.
The external socket(s) on the side of the vehicle for connecting the coax for a dipole was the standard Burndept type. The dipole centre piece was also a Burndept.
The antenna wire was normal R4 copper.
Marconi provided TX and RX baluns for a 75 coax to 600ohm open wire feeder using R4 for use with Vs and rhombics for long haul links but we had no use for them. Besides, the huge real estate needed for a rhombic was strictly for a home station or specialist units with lots of infantry for protection.
I have in storage a TX balun - a massive thing the size and shape of a chamber pot with two long feed through insulator "horns" for the open feeder. I cannot recall the coax socket but it was bigger than a Burndept.
That may be for the "Antenna Group, Sloping Vee", or possibly for something considerably more potent than a "D" series transmitter. (Marconi SWB or T E10, etc.)