[TowerTalk] 40 meter dipole

[john at kk9a.com]

I agree that loaded center fed 40m rotatable dipole is an effective antenna
, even on portions of the band where the SWR is higher.  

On 80m many people use a 1 WL section of 50 ohm coax following by a 1/4 WL
section of 75 ohm coax to make their dipole cover both the CW and SSB
segments of the band.  Obviously this does not change the actual antenna
feed point SWR but it may make the radio, amp and operator happier.  I
wonder if anyone has used this type of broad band transmission line match on
40m?

John KK9A



Jim Brown K9YC

SWR is NOT a measure of antenna performance, and the added loss due to 
SWR values below 3:1 at the feedpoint are too small to matter unless 
you're using line smaller than RG8/11, and/or the lines are very long. 
My 80M dipole at 125 ft fed with about 170 ft of a good RG11 presents a 
5:1 SWR on 60M at the TX, but is quite effective running legal limit 
(100W ERP).

73, Jim K9YC