Surveyor Posted February 20, 2023 Share Posted February 20, 2023 Have this, no description or numbers any where, some one suggested I open it which I did, as can be seen full of silicone. Can my learned friends help, another suggestion was its RAF, can in a bag with NP67AA on it, last issue maybe? Thanks in advance Richard Quote Link to comment Share on other sites More sharing options...
mogmaner Posted February 20, 2023 Share Posted February 20, 2023 Looks like an dipole aerial center ,high power judging by the construction and N type socket at the base. 1 Quote Link to comment Share on other sites More sharing options...
fv1609 Posted February 20, 2023 Share Posted February 20, 2023 NP 67 AA is the ERM for Truck Platform 4Tonne 4x4 (DSL) EURO 1 LEYLAND DAF NSN 2320-99-893-8860 Code DB 2091-3103 Here is a picture of NP 66 AA I assume your box is a BALUN transformer. It it used at the centre of a HF wire dipole (ie balanced) to match to a coax cable feed (unbalanced) to the radio equipment. Torroids are rather delicate and embedding in silicone gives some support. I expect there is a large torroid inside with appropriate turns wound through it. There looks to be an emergency spark gap should part of the dipole attachment fail then RF power could be dissipated to earth rather than cause a serious overload to the transmitter. 1 Quote Link to comment Share on other sites More sharing options...
Surveyor Posted February 20, 2023 Author Share Posted February 20, 2023 Many thanks, there was a manual along with other kit saying RA 905 was not sure if they went together Quote Link to comment Share on other sites More sharing options...
Surveyor Posted February 20, 2023 Author Share Posted February 20, 2023 (edited) Does anyone want one? Edited February 20, 2023 by Surveyor Quote Link to comment Share on other sites More sharing options...
fv1609 Posted February 20, 2023 Share Posted February 20, 2023 Not really, HF is not my thing. Currently playing with scatter on 24GHz. 1 Quote Link to comment Share on other sites More sharing options...
andym Posted February 24, 2023 Share Posted February 24, 2023 See page 16 here: http://www.radiomanual.info/schemi/Surplus_Handbooks/Racal_antennas_catalogue_1986.pdf Andy Quote Link to comment Share on other sites More sharing options...
Surveyor Posted February 24, 2023 Author Share Posted February 24, 2023 4 hours ago, andym said: See page 16 here: http://www.radiomanual.info/schemi/Surplus_Handbooks/Racal_antennas_catalogue_1986.pdf Andy Many thanks an interesting document Quote Link to comment Share on other sites More sharing options...
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