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#1
12-02-24, 17:40
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I have one of those as well. 
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#2
13-02-24, 02:32
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The mounting is the steel/rubber turret roof version (No.1?) that is secured by Aerial Feeder No.4 or No.5 and the fine-threaded nut and tab washer. The Aerial Base is the standard No.8. The next piece is "Adapter, Aerial, No.1" ZA.27220 which _is_ wartime issue and killed off the phantom "Aerial Base No.19" that someone here discovered a teleprinter message from London admitting that only a single prototype had been made! (It carried on well into the modern era but has possibly been killed off by BOWMAN - they were certainly issued with Larkspur installation kits and the only difference is the earlier ones marked ZA.27220 and the later ones with larger numbers showing the last 7 digits of the NATO Stock Number. The 'F' rod diameters didn't change, so it would fit anything up to Aerial Base No.31 Mk.7 and be useful for laying the aerial flat when required. Best regards, Chris.
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#3
13-02-24, 07:40
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Hi Chris, much thanks for your replies.
Indeed yes that image with wading trunks lying in the foreground was taken on June 6th 1944. The M10s are identified as belonging to 3rd Canadian Anti-Tank Regiment. Talk about going full circle about the antenna setup on the front glacis. That would explain why I could not find a proper modern photo with a thicker base stem, and the only closest resemblance turns out to be a "Horrible Bodge".
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#4
13-02-24, 17:36
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Is this where the G rod length measurement would lie as represented with the green line? The forum has its diameter quoted as 1/4 inch so the thickness of that green line is also scaled to match the length. Visually it seems the rod in the photo would be near double diameter and it does appear much heavier than the aerial located on the hull front.
G rod dimensions.jpg
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#5
13-02-24, 22:09
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The question is: can I put my hand on the one I've got at this time of night? (Answer: No. Darn it all to Heck (in lieu of anything stronger - I must have moved it during the last sortout).  Back to the photograph... the tip of the red arrow is pointing at a white stripe; this is the nickel-plated inverted cup that is the start of Aerial Base No.9, and has a Pye connector in the centre with a pigtail lead that goes up to the (again nickel plated) top cap on the ribbed rubber insulator - the aerial rod screws into the centre of the top cap (2BA thread (I think)). The coaxial feeder (Leads, Aerial, No.2 ZA.3142 or No.3 ZA3143 from memory) is stuffed up from inside the hull, attached to the aerial base and the horseshoe shaped wire clip fastened, after which the clip is secured with some twisted copper wire and the base attached to the mounting with four screws. The aerial leads for the 'B' set are a tuned length and must not be shortened.  That mounting looks like the one I have (somewhere), and most of it is thin-wall duralumin tubing painted dark green (wrinkle finish) which makes me think it's USA manufactured. The Australian version used a big steel coil spring instead of the rubber mounting at the base of the mount. Hope this is some help, I'll continue looking for the mounting. Chris. (G8KGS)
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#6
19-02-24, 15:41
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"The 'F' rod diameters didn't change,"
Not. http://i105.photobucket.com/albums/m...945%20Pg.4.jpg ZA 0894 No.1 49.5" long 3/8-3/8 diameter both ends male/female ZA 0895 No.2 49.5" long 3/8-1/4 diameter at ends male/female ZA 0896 No.3 49.5" long 1/4-1/8 diameter at ends male/female I've also seen a 'battle' aerial 4'+- 3/8(1/4??) male base 1" 1/2 long with balance 1/8 rod 3/16 ball on top. There are probably other variations around. Actually that is why a WS38 has 2 or 3 adjustable holes to insert aerial rods. Geoff
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#7
19-02-24, 17:32
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Jack, that American M10 aerial looks suspiciously like a High Frequency item from their extensive line of signals equipment. They did not make much use of the 19-Set, so an installation point for a B-Set aerial on their M10's would likely be irrelevant to the crew. The B-Set was for inter vehicular communication between tank crews at VERY close range. For a Commonwealth M10 crew, it would probably not take too long for them to realize with open turrets, it was likely far easier to yell or hand signal intensions to adjacent crews.
As for the turret traverse causing aerial damage from the gun barrel, that also may not have been a serious problem. the M10 turret, if I recall correctly, was manual traverse only with a 360 degree travel rate on the order of 80 to 90 seconds. Pretty slow. I think the M10. both 3-inch and 17-pounder, also had longstanding issues with either gun being too heavy for the turret and several attempts at counterbalancing were made throughout the service life of the M10. If the vehicle was traversing a slope, there was serious risk the turret stops could fail and the weight of the barrel suddenly swing the turret to face the low side of the vehicle. Not good for crew moral. David
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#8
21-02-24, 11:19
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#9
21-02-24, 14:58
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Thank you Jakko for that manual link.
The Dennis Oliver publication also does not mention the speed at which the turret could be rotated by hand, but was certainly a disadvantage of the design. Wiki footnotes on the M10 attribute Steve Zaloga giving approximately 80 seconds to rotate the turret a full 360 degrees. About the sloped terrain effects on the function of the vehicle, Dennis Oliver only mentions it made it difficult to rotate the turret when parked on a slope of more than four degrees. This problem was the main reason for adding weight to the turret rear. Initially the counterweight was about 3700 pounds. When a new turret was designed to afford more space to the crew, a new counterweight was also introduced and was lighter at 2500 pounds. Last edited by Jack Geratic; 21-02-24 at 16:33.
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#10
19-02-24, 19:15
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The original "Aerial Rods, 'F'" were 48 inches long and there were a set of three rods which could 'stack' into the then new Aerial Base No.8 for vehicle use. No.1 was the lowest, No.2 was the 'middle' and was swaged down to the same diameter at each end so that two could be used, and No.3 was the top and generally tapered to a point. They allowed for a 16-ft aerial to be constructed (1 x No.1, 2 x No.2, 1 x No.3) for static use or as part of the 34-ft Steel Vertical Aerial, but tended to come apart when used on moving vehicles. The Canadians solved that problem, extending the length by 1.5 inches and rolling a coarse thread into the extension. (So they were still compatible with the previous version but could be pushed together and then screwed home to prevent the shaking causing them to separate and be lost from moving vehicles. Aerial Base No.10 Mk.1 was developed to replace Base No.8, with a wing-nut operated clamp instead of the earlier spring wire clip. (This was later replaced by the No.10 Mk.2 with a terminal added to the clamp so that the aerial could be fed from the top _or_ underside, and wire aerials could be used (Aerial, 100-ft, No.5) that didn't need a plug to mimic an aerial rod. Those rods became (and remained) the standard from WW2 up until the end of CLANSMAN and its replacement by the BOWMAN range of Combat Net Radio. The rod diameters remained the same even with the introduction of a standard 1 metre length (Metric!) with Clansman, and GRP aerial sections. During WW2 the 'F' rods were also used with manpack sets, e.g. WS38 Mk.2 which had its own set of 4 rods: 1,2 & 3 for 4, 8, or 12-ft (only really used for static operation), and a "Battle Whip" referred to as '3B' by the Artillery consisting of a spring steel rod welded/brazed into a steel plug to make it compatible with the No.3 rod. (It was a _serious_ eye hazard, being small diameter and very rigid - I protect the end with a cork if I need to use one.) There were other lengths of 'F' rods for various purposes, but 1, 2, 3 and 3B are the most common ones. Loading the poor old infantry with a quiver of 4-ft aerials was decided to be a bad idea, so the WS38 Mk.3 was issued with Aerials 4-ft No.1 and No.2 - a pair of folding 'F' rod numbers 2 & 3 equivalents that were threaded on a wire and could be carried in the backpack (Satchel, Signals, No.10) with the set and ancillaries. The 12-ft option was discarded. (The WS 62 got a folding 14-ft whip and the two 4-ft folding rods in Case, Aerial Rods, No.5, which could be fastened to the set for easy carriage.) I think that's enough of my waffling for tonight. :-)> Chris (G8KGS)
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#11
21-02-24, 01:59
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Gentlemen, thank you for the continued interest on the subject.
First time I have ever seen mention of a 'battle' aerial, intrigued. Am not aware of Americans ever using British/Commonwealth radio systems and vise versa in their respective vehicles. If there was something in my postings that seemed to be contrary to this, my apologies. For the gun weight issues, this was addressed on the M10 by adding a purpose made wedge shaped weight directly to the turret rear. The 17pdr had an additional weight problem as the breech was heavier than the barrel. This was solved by adding a counterweight at the front of the gun barrel. When in travel mode the gun was suppose to be secured in place via the gun lock/cradle located on the rear deck.
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#12
22-02-24, 07:31
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#13
22-02-24, 15:50
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Alright Bruce, I stand corrected for making a generalized statement. Though am still unaware of Americans using British wireless in their M10s.
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