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#10
February 1st 07, 04:48 AM
posted to rec.radio.amateur.antenna
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Matching Issue ........... I think!
Jim Kelley wrote:
wrote: I recently built a modified vertical dipole from wire and using a pole and trees as supports. I had hoped it would work on 2 bands 75 and 40 but it only works on one 75 where the VSWR is 1.3:1 and the bandwidth is 85 khz for the 2:1 points. On 40 meters the VSWR is over 10:1 so I thought I could use a 1/4 coax matching section 50 ohms but this doesnt solve the problem either as the VSWR doesnt change much with the extra coax section. I did cut the section properly as the velocity factor for the coax is .78% which gave me 26.825 ft. Not sure what I am doing wrong or assuming - but looks like I could use some input. Try a half wavelength of coax. ac6xg why a half wave? -- I SPILLED SPOT REMOVER ON MY DOG..............AND NOW HES GONE!! |
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