UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Triax UHF Aerial

SteveCG · 24th Apr 2019, 11:12 am

Dear All,

A few years ago I was given a Triax UHF aerial whose lashings had finally failed. The question I'm asking is what Channel range did it cover?

I don't have a camera to take a 'photo but here is some information on it:

It is a (Triax nomenclature) "18 element" design, which has a six element barred reflector and a 'squashed' folded dipole, and 11 plain directors.

It is end mounted, with the boom split into two equal lengths making a total length of 1360mm.

The reflector element width is 420mm. The outermost director length is 130mm.

It has a printed circuit balun in the junction box.

The aerial was originally pointed at the Ridge Hill transmitter and I reckon dates from the early days of dual analogue/digital transmissions.

I've looked up Triax's recent catalogue and the only 18 el design of a similar style uses a centre mount trombone system.

The aerial is probably a Wideband design, but if so was it a 21-68, or was it a 21-60 design since Triax's Danish home-land only used TV upto channel 60.

I must say the dipole size made me wonder whether it could be a group E design.

Perhaps somebody has a Triax UK catalogue from about 2005, that may answer the question?

24th Apr 2019, 11:12 am	#1
SteveCG Nonode Join Date: Jun 2009 Location: Herefordshire, UK. Posts: 2,495	Triax UHF Aerial - info Dear All, A few years ago I was given a Triax UHF aerial whose lashings had finally failed. The question I'm asking is what Channel range did it cover? I don't have a camera to take a 'photo but here is some information on it: It is a (Triax nomenclature) "18 element" design, which has a six element barred reflector and a 'squashed' folded dipole, and 11 plain directors. It is end mounted, with the boom split into two equal lengths making a total length of 1360mm. The reflector element width is 420mm. The outermost director length is 130mm. It has a printed circuit balun in the junction box. The aerial was originally pointed at the Ridge Hill transmitter and I reckon dates from the early days of dual analogue/digital transmissions. I've looked up Triax's recent catalogue and the only 18 el design of a similar style uses a centre mount trombone system. The aerial is probably a Wideband design, but if so was it a 21-68, or was it a 21-60 design since Triax's Danish home-land only used TV upto channel 60. I must say the dipole size made me wonder whether it could be a group E design. Perhaps somebody has a Triax UK catalogue from about 2005, that may answer the question? Last edited by SteveCG; 24th Apr 2019 at 11:14 am. Reason: layout and information correction