04-11-2017, 07:16 AM
Iain
"There's no resistor in the CHA250, but it still doesn't work very well."
Maybe my memory is playing tricks on me but I sold Comet products back 10+ years ago and I was pretty sure there was. Maybe they have changed the recent design but not the model code. If it wasn't the CHA250, then at least one other manufacturer back then was doing as described (swamping resistor/balun..) and selling a 3-30MHz vertical 10 metres long, no radials required, SWR guaranteed not to exceed something like 3:1 across the full range. They also sold a longwire version with the same feed unit, just the wire was longer than the vertical model.
Must be signs of old age creeping in
73 Doug
"There's no resistor in the CHA250, but it still doesn't work very well."
Maybe my memory is playing tricks on me but I sold Comet products back 10+ years ago and I was pretty sure there was. Maybe they have changed the recent design but not the model code. If it wasn't the CHA250, then at least one other manufacturer back then was doing as described (swamping resistor/balun..) and selling a 3-30MHz vertical 10 metres long, no radials required, SWR guaranteed not to exceed something like 3:1 across the full range. They also sold a longwire version with the same feed unit, just the wire was longer than the vertical model.
Must be signs of old age creeping in
73 Doug
Doug VK4ADC @ QG62LG51
http://www.vk4adc.com
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http://www.vk4adc.com
This Forum is only going to be as interesting as the posts it contains.
If you have a comment or question, post it as it may trigger or answer the query in someone else's mind.