andym Posted October 22, 2016 Share Posted October 22, 2016 I'm sure someone on here will know (probably Iain!) - if I'm putting a 3m HF antenna on a vehicle, does it use two of the normal bottom rods and one top, or something different entirely? And yes, I know it's a subtly different base to the usual VHF one. Andy Quote Link to comment Share on other sites More sharing options...
andym Posted October 22, 2016 Author Share Posted October 22, 2016 Answering my own question it looks as though I need a middle rod as well but I would be grateful if someone can confirm that? Andy Quote Link to comment Share on other sites More sharing options...
g0ozs Posted October 22, 2016 Share Posted October 22, 2016 (edited) Andy I'm not sure what the "official" configuration is (Alien may be able to advise?) - I think the top 2 have to be a middle and top and you can then put 1 or 2 bottom sections below it for 3 or 4m - you could probably improvise 3 bottom sections in line for a 3m antenna in a static station where the extra top weight and wind resistance are less of an issue Regards Iain Edited October 23, 2016 by g0ozs change or for and Quote Link to comment Share on other sites More sharing options...
andym Posted October 22, 2016 Author Share Posted October 22, 2016 Thanks Iain! Andy Quote Link to comment Share on other sites More sharing options...
johnwardle Posted October 22, 2016 Share Posted October 22, 2016 I'm sure someone on here will know (probably Iain!) - if I'm putting a 3m HF antenna on a vehicle, does it use two of the normal bottom rods and one top, or something different entirely? And yes, I know it's a subtly different base to the usual VHF one. Andy I have some centre sections that I am taking to the Dallas Dig Out tomorrow, I had them for a FFR Land Rover, there are 2 different lengths, 1 metre for the rear antenna mounts and 1.25 meters for the front mounts. If you're going look me out. Quote Link to comment Share on other sites More sharing options...
Bob042 Posted October 25, 2016 Share Posted October 25, 2016 I'm sure someone on here will know (probably Iain!) - if I'm putting a 3m HF antenna on a vehicle, does it use two of the normal bottom rods and one top, or something different entirely? And yes, I know it's a subtly different base to the usual VHF one. Andy Hi Andy, I've got two sets of HF rods that came bagged as sets and without going to check, I think it's 2 bottom and one top. I will check tomorrow if someone else (Iain?) doesn't come in with a definitive. Regards Bob Quote Link to comment Share on other sites More sharing options...
andym Posted October 25, 2016 Author Share Posted October 25, 2016 Thanks Bob. There's an earlier thread here on HMVF that gives NSNs for the three sections, but I think it has the bottom and middle ones swapped. Andy Quote Link to comment Share on other sites More sharing options...
Bob042 Posted October 26, 2016 Share Posted October 26, 2016 Thanks Bob. There's an earlier thread here on HMVF that gives NSNs for the three sections, but I think it has the bottom and middle ones swapped. Andy Andy, Middle section for HF is (630-8456) used as bottom section with top section 630-8457 (subsequently superseded by 649-8410 ) for 2 section VHF sets, bottom section for HF is 630-8455. Double up on middle section 8456 for 4m HF whip. I think this is right. Regards Bob Quote Link to comment Share on other sites More sharing options...
andym Posted October 27, 2016 Author Share Posted October 27, 2016 Thanks Bob, on investigation I think the top section is actually 649-8140. The confusion is whether a 4m HF antenna uses two middle sections or two bottom sections, there seems to be a difference of opinion and I can't find an official source of information. I only need 3m at the moment, so one of each section. Andy Quote Link to comment Share on other sites More sharing options...
gordonb Posted October 27, 2016 Share Posted October 27, 2016 Without going and looking, is it not the case that a top section will only fit into the top of a middle section, which is smaller than the bottom. Therefore you can only use one middle section. So, for a 4m whip you need one top, one middle and two bottoms. Or four bottoms. or three bottoms and a middle. Gordon 03BB33 Quote Link to comment Share on other sites More sharing options...
gordonb Posted October 27, 2016 Share Posted October 27, 2016 Not wishing to be called lazy, I've been and checked and what I thought is indeed the case. I can also confirm the NSNs as: top - 5985-99-649-8140 middle - 5985-99-630-8456 bottom - 5985-99-630-8455 Gordon 03BB33 Quote Link to comment Share on other sites More sharing options...
Bob042 Posted October 27, 2016 Share Posted October 27, 2016 (edited) Thanks Bob, on investigation I think the top section is actually 649-8140. The confusion is whether a 4m HF antenna uses two middle sections or two bottom sections, there seems to be a difference of opinion and I can't find an official source of information. I only need 3m at the moment, so one of each section. Andy Andy, The 4m is 2 bottom, 1 middle and 1 top, that's what came in my sealed poly bags. This is the 3m fitted to my FFR Lwt; Edited October 29, 2016 by Bob042 Incorrect info given Quote Link to comment Share on other sites More sharing options...
andym Posted October 27, 2016 Author Share Posted October 27, 2016 Brilliant - thanks Bob! Andy Quote Link to comment Share on other sites More sharing options...
Bob042 Posted October 29, 2016 Share Posted October 29, 2016 (edited) Hi Andy, Apologies, in my post above I gave you the wrong info :embarrassed:, 4m is 1 top, 1 middle, 2 bottom, see pic of the complete set, I have amended the incorrect post to avoid any confusion. Regards Bob Edited October 29, 2016 by Bob042 Quote Link to comment Share on other sites More sharing options...
andym Posted October 29, 2016 Author Share Posted October 29, 2016 Thanks Bob! Andy Quote Link to comment Share on other sites More sharing options...
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