11 Set stuff

[Chris Suslowicz]

Originally Posted by cletrac

What set is this aerial mount for? The clamp on top has quite an 11 set look to it. The second image is the 19 set base and this one looks like an earlier version somehow.

Top pic is Aerial Base No.10 Mk.2 - general purpose HF aerial base for 'F' rods.

Bottom pic is Aerial Base No.8 - original base for the WS19 that was replaced by the No.10 Mk.1 and then the No.10 Mk.2

U.S. and Canadian manufactured sets were still being supplied with Base No.8 when WW2 ended. They are not much good for use on the move because the aerial rod flexing causes the retaining spring to get metal fatigue and either stretch or break, releasing the grip of the base on the rod, which can then fall out and be lost. Hence the No.10 with a butterfly nut clamp. The No.10 Mk.1 has a convex-shaped rubber insulator which met the metal mounting plate at a sharp angle and this was not good for the bond strength. Also it had a two part riveted retaining clamp, as with the Aerial Base No.11 and was complicated to make. The No.10 Mk.2 had the pressed steel clamp with the through bolt that you see (and a built-in terminal for attaching feeder cables for some installations or the spade-ended Aerial, 100-ft, No.5) and the shape of the rubber was modified to be concave where it met the steel plate for better bond strength.

The mounting bracket is for a Jeep, according to the eBay seller. They may be right.

Chris.