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102 inch antenna
- Thread starter Xitami
- Start date
1 quarter of 11 meters is 2.75 meters, which equals 108.2677 inches.
So, the extra 6 inches is to stretch that 102" antenna out to 108", which makes it closer to an actual 1/4 wave.
So, the extra 6 inches is to stretch that 102" antenna out to 108", which makes it closer to an actual 1/4 wave.
I've had great luck w the mfj 108 in whip. Breedlove ball mount on rear fender of my old honda. Works like a champ! Ran a Wilson 5k and a Sirio p5k. ..both very respectable but not as well as the 108 in stainless steel. http://www.mfjenterprises.com/Product.php?productid=MFJ-1966 http://www.worldwidedx.com/threads/1-4-wave-install-on-my-old-honda.168409/
SS.
I used a short chunk of SS rod 3/8 and thread both ends, then a nut on the top end for the XYL's truck. (she runs a DX 979 with 102 whip)
I don't see them as much these days. A lot of trucks in the oil fields used them for radio and with flags on the tip made them visible for on coming traffic especially on hills.
I always thought they looked cool mounted on the back of the old Willy's jeep.
RatsoW8
Supporting Member, W9WDX ARC Member - WD8T
What formula are you using to come up with 108.2677" ? I use the standard 234/freq to calculate 1/4 wave verticals. That's gives 103.3" for 27.185 MHz.
The last two stainless whips I found at a ham fest were not quite 98" tall and worked perfectly on 10 meters with no trimming required.
I seem to recall reading that the MFJ 108" whip actually measures out at 102" which is close to 103.3". Maybe someone can verify.
A quarter wave in free space in feet is 246/f. 246/27.185 is 108.589 inches.
Since nothing is free, they stole some when they made the formula for a dipole
I'll measure my MFJ whip from HRO when I get home later today.
Since nothing is free, they stole some when they made the formula for a dipole
I'll measure my MFJ whip from HRO when I get home later today.
I divided 11 meters by 4, which gave me 2.75 meters. I then went to Google, and had Google convert 2.75 meters into a measurement in inches. The result was 108.2677 inches.
I suppose that, since I am most frequently on Channel 19, I could tailor the antenna to that specific frequency, but would the effort be worth the reward? (<~~ Actual question, by the way; not being sarcastic )
