20-02-2018, 09:16 PM
Wayne
Expect narrow SWR bandwidth with helical radials : the Diamond CP6 does have them but have a look at the freq response width at http://www.diamondantenna.net/pdfdocs/CP6A.pdf
To homebrew, try this calculator with the same values for min and max former diameters for straight wall PVC tube (non-shrinking) - it will at least get you into the 'frequency ballpark' :
http://www.vk4adc.com/web/hf-projects/45...-whip-calc
Doug
Expect narrow SWR bandwidth with helical radials : the Diamond CP6 does have them but have a look at the freq response width at http://www.diamondantenna.net/pdfdocs/CP6A.pdf
To homebrew, try this calculator with the same values for min and max former diameters for straight wall PVC tube (non-shrinking) - it will at least get you into the 'frequency ballpark' :
http://www.vk4adc.com/web/hf-projects/45...-whip-calc
Doug
Doug VK4ADC @ QG62LG51
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.
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.