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#1
24-07-17, 22:12
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I just had a look at the Challenger parts list to see what a similar setup would look like, but alas it doesn't seem to cover it (it stops with just the nuts and bolts that are needed to attach the mount).
The radio kit itself must be a different publication. 
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#2
24-07-17, 23:26
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Just looked up in the EMER book. There isn't a firefly specific listing. However under the listing for the Grizzly the insulator is
Mountings, Aerial Bases, No1, mk1 ZA1825 PC 76456 C Everything else seems to use the Mountings, Aerial Bases No3, Mk1 ZA1827 PC 76555 C
__________________
Jordan Baker RHLI Museum, Otter LRC C15A-Wire3, 1944 Willys MB, 1942 10cwt Canadian trailer
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#3
24-07-17, 23:41
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Quote:
No.3 is a plain disc which may be made of rubber, plywood, or steel (two cups seam-welded together) and has holes drilled straight through. It's a stand-off for use with the connector plate on a flat surface and requires nuts and bolts to fit it. Later they were used together for the WS31AFV and WS88AFV to create enough room under the aerial base to terminate the aerial feeder correctly. (This also required an additional fixture to simulate the 'conduit' of the WS19 variometer feeder. Chris. Last edited by Chris Suslowicz; 30-07-17 at 21:17. Reason: Typo
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#4
24-07-17, 23:33
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Sigh....
It looks like the turret comes pre-drilled for the U.S. aerial insulator, so you need various extra bits to fit the WS19 aerial base and variometer: ZA.1825 Mountings, Aerial Base, No.1 (middle of bottom row). ZA.2948 W.S. No.19, Plates, Packing (not sure what this is at the moment) ZA.2957 W.S. No.19, Aerial Feeder No.4 (short tubular one for variometer) ZA/USA 1051 Variometer Adapter Plate ZA/USA 1053 Variometer Adapter Washer This is out of a late-WW2 US Mk.2 install for M4 tank, so is probably what you need. I think the 'Plates, Packing' is a large square washer that goes between the aerial feeder and the roof, and the "variometer adapter plate" is actually a bar with a pin and socket to transfer the locating stud on the variometer to a drilled socket in the roof, clear of the large American hole. The adapter washer is dropped in from the top and serves to centre the aerial feeder in the large hole (after which the Mounting fits over the feeder followed by the tabbed washer and the securing nut). (Do NOT overtighten the securing nut!) It is possible that I have some/all of these bits. Finding them may be another matter. Right now I need sleep, I'm up at Oh God o'clock to go to Beltring. Goodnight! Chris.
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#5
25-07-17, 07:39
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Quote:
That said, I have worked out what the 'packing washer' is for: it's square and supplied curved so that it allows the nut that secures aerial feeder to be tightened far enough that you can bend the tab on the locking washer without stripping the thread on the nut or pulling the tube out of the plate. So, you want (from inside the tank): Variometer. Aerial Feeder No.4 Variometer Adapter Plate Plates, Packing Variometer Adapter Washer ----- turret roof ----- Mountings, Aerial Base, No.1 Tabbed lock washer from Aerial Feeder No.4 Securing nut (ditto) Aerial pigtail (fit to aerial base first, then to end of aerial feeder) Aerial Base No.8 or the rather better No.10 6 hex bolts and spring washers to secure aerial base (1/4-in BSF, I think). It's possible that the adapter plate and packing plate go on in reverse order, but the adapter washer goes into the large hole in the roof in order to centre the aerial feeder in that hole. You may have to drill blind holes to take the locating peg for the variometer adapter plate inside the turret and the aerial base mounting on the outside. (The installation print may have diagrams for this.) Chris. Last edited by Chris Suslowicz; 30-07-17 at 21:19. Reason: Typo
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#6
25-07-17, 23:00
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This is what I have to date...
Variometer Installation.jpg There is a pigtail on the underside of the No10 base Does this look right? Cheers Tim
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#7
26-07-17, 11:38
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I guess am now answering my own question!
As have found this... Variometer Installation Drawing.jpg Parts I therefore need to find to complete what I need for the installation are: Working from the Aerial Base down... 1 x Tab Washer - PC 47448C 1 x Variometer Adapter Washer - SD III R-140 1 x Variometer Adapter Plate - WA 623 - SD III R-113 1 x Plates, Packing No 1 - PC 76552C - ZA 2948 If anyone has any of the above parts they are happy to part with, please let me know. Cheers Tim
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#8
26-07-17, 18:09
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Another useful doc to add to this...
Unsure where this one came from - found it in an old folder while rummaging for something else! First drawing - distance piece - is "Plates, Packing, No1" Second drawing - Wooden Spacer - am not sure... might be the Variometer Adapter Plate... depends how big the US Antenna hole is on the Sherman. WS19-Variometer-Packing Pieces.jpg At worst therefore I can make these parts now! However, it would still be easier to find ready made bits - we have enough parts to make already. Cheers Tim Last edited by Tim Bell; 26-07-17 at 18:14. Reason: added
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#9
30-07-17, 21:25
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Chris. (Back from Beltring and just about recovering from it - I need some new knees!)
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#10
31-07-17, 02:52
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Have PM'd you on this. Cheers Tim
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