H aerial - UK Vintage Radio Repair and Restoration Discussion Forum

EF80TVVALVE · 9th Apr 2011, 11:22 pm

Hi, I think this should go here. Anyway, I would like to make a H aerial but does anyone know what type of metal I should use for the Dipole and the reflector?

Herald1360 · 9th Apr 2011, 11:35 pm

Within reason, anything will do. Light gauge aluminium tubing about 10mm or 3/8" OD would do nicely and be similar to the original (if it's a band 1 TV type you're considering).

EF80TVVALVE · 9th Apr 2011, 11:50 pm

ok, thanks for that! Yes, I am building it for that use (really, I just want to have a go at making my own!)

arjoll · 10th Apr 2011, 12:44 am

Band I aerials here are generally made of aluminium tube about 10mm diameter as Herald has suggested. The last one I looked at here had a dowel inside the tube, presumably for a bit of physical strength in strong winds etc.

Boom · 10th Apr 2011, 12:25 pm

I'm not sure of exact details but seem to recall reading that some aerials had string inserted inside the rods to damp down wind vibration.

Dave UXB · 10th Apr 2011, 10:52 pm

Quote:

Originally Posted by Boom

I'm not sure of exact details but seem to recall reading that some aerials had string inserted inside the rods to damp down wind vibration.

very true. a cord or similar in the tubes, secured at the ends will help a great deal.

G8HQP Dave · 11th Apr 2011, 11:17 am

I'm not sure how critical this will be, but don't forget that the length for resonance depends to a small extent on diameter, so if you are following a design then thinner elements need to be slightly longer.

9th Apr 2011, 11:22 pm	#1
EF80TVVALVE Octode Join Date: Feb 2010 Location: Leicester, UK. Posts: 1,433	H aerial Hi, I think this should go here. Anyway, I would like to make a H aerial but does anyone know what type of metal I should use for the Dipole and the reflector?

9th Apr 2011, 11:35 pm	#2
Herald1360 Dekatron Join Date: Feb 2007 Location: Leominster, Herefordshire, UK. Posts: 16,536	Re: H aerial Within reason, anything will do. Light gauge aluminium tubing about 10mm or 3/8" OD would do nicely and be similar to the original (if it's a band 1 TV type you're considering). __________________ ....__________ ....\|____\|\|__\|__\_____ .=.\| _---\__\|__\|_---_\|. .........O..Chris....O

9th Apr 2011, 11:50 pm	#3
EF80TVVALVE Octode Join Date: Feb 2010 Location: Leicester, UK. Posts: 1,433	Re: H aerial ok, thanks for that! Yes, I am building it for that use (really, I just want to have a go at making my own!)

10th Apr 2011, 12:44 am	#4
arjoll Dekatron Join Date: May 2006 Location: Invercargill, New Zealand Posts: 3,458	Re: H aerial Band I aerials here are generally made of aluminium tube about 10mm diameter as Herald has suggested. The last one I looked at here had a dowel inside the tube, presumably for a bit of physical strength in strong winds etc.

10th Apr 2011, 12:25 pm	#5
Boom Retired Dormant Member Join Date: Jan 2007 Location: Westbury, Wiltshire, UK. Posts: 2,451	Re: H aerial I'm not sure of exact details but seem to recall reading that some aerials had string inserted inside the rods to damp down wind vibration.

11th Apr 2011, 11:17 am	#7
G8HQP Dave Rest in Peace Join Date: Sep 2008 Location: Solihull, West Midlands, UK. Posts: 4,872	Re: H aerial I'm not sure how critical this will be, but don't forget that the length for resonance depends to a small extent on diameter, so if you are following a design then thinner elements need to be slightly longer.