The three feeder cables are:
ZA.3141 Leads, Aerial, No.1 for the "A" set to the variometer.
ZA.3142 Leads, Aerial, No.2 for the "B" set to Aerial Base No.9 (standard length)
ZA.3143 Leads, Aerial, No.3 for the "B" set to Aerial Base No.9 (extended length)
The No.1 has elbow sockets on each end and the length is not critical. It was frequently shortened by the wireless fitters to suit the actual installation. (Later on a variety of different lengths were standardised, for specific installations.)
The No.2 and No.3 leads were specific lengths to match the 'B' set to the Aerial Base No.9 plus Aerial Rod 'G', and were marked (as noted elsewhere) "Tuned Length - Do Not Cut". They had an elbow socket for the set end and an in-line socket for the aerial base (this required a "horseshoe shaped" wire clip instead of the straight bar variety used with the elbow connectors, but a lot of replacement No.9 bases were shipped with the wrong clip because "standard" Pye connectors were used, and the clips had to be changed before installation).
These were redesignated, becoming Connector, Coaxial, No.10 (from Leads, Aerial, No.1),
Connector, Coaxial, No.11 and No.11A for numbers 2 & 3, respectively.
Connector, Coaxial, No.10A was used between the WS19 and the RF Amplifier No.2 in a "side by side" configuration, while No.10B was used where the RF Amplifier was mounted on top of the set. No.10E was used to connect the RF amplifier output to the Aerial Tuning Inductance No.1 when this was mounted on the WS19 supply unit top, or for the set to variometer when that was fitted to a top plate on the WS19. The 10x range went up to "K", at least, but there's no particular pattern between the suffix letter and the length.
Later still, they dropped the suffix letter and used "Connector, Coaxial, No.10" followed by the length (in inches), e.g. "16-in."
Eventually some of these acquired NATO Stock Numbers.
Chris.
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