Ratshack 102" whip question
Have any of y'all used it for 10 meters? How well did it work out? Did you have to trim any off??? And will it work good without a tuner?? I'm still working on building my shack back up, had to sell EVERYTHING a few years ago, and forgot 90% of what i had...
Or are there other BETTER (but still in the cheaper 50-150 price range) that aren't SUPER LONG...
I'm slightly limited by the city on antenna heights.. not much just don't want the complaining
Thanks for any and all input!!
They work great. You will need to trim it. Go slowly, see where you get the lowest SWR, trim an inch or so, see where you are, trim some more, etc. It depends what part of 10 you are interested in, but you should get ok SWR across the band.
Originally Posted by KD5WGK
You'll need some kind of radials for a vertical. Get two of these plus the hamstick dipole mount (MFJ sells one) and make a 10 meter dipole.
I converted a Radio Shack 3 element yagi from CB to 10 meters. There was an article in one of the magazines way back. I think QST, I'm talking 1980's...
If one doesn't want to bother with trimming the whip, a ~500 pf cap in series at the feedpoint will resonate a 102" whip to ~28.4 MHz.
73, Cecil, www.w5dxp.com
Random length "tuned feeders" usually de-tune
an antenna system (thus requiring a tuner).
So your talking something like this, http://www.k1cra.com/catalog/product...productID=2824
And only one half of the antenna get hooked up to the radio, am i correct or completely not understanding?
Cecil, could u link me to the proper cap you are talking about???
Made MY FIRST contact (on something other then 2m or 440) to an island north of Venezuela @ 11:10 on 10 meters using a wire dipole in my attic... I can say i am HOOKED on this now, the THRILL of making a contact that far away was AWESOME! To bad 10 meters died shortly after that... but it was fun!
I'm planing on using the 2 102" whips i bought today at radio shack and that mount for the link i posted to do another (hopefully BETTER) dipole and throw tht thing ATLEAST 15-20 feet up there on top of a pole...
No, you would use two whips, one is connected to the shield and one is connected to the center of the coax. This is taken care of by the mount. It makes a 1/2 wave dipole (1/4 wave on each side). Its cheap, its easy to mount, and you can turn it with any TV antenna rotor.
Originally Posted by KD5WGK
Well, tht mount has 2 posts to screw them on i'd just need to turn one around, if you look at the second pic you'll see what i'm talking about a bit better, How important is the rotor? Not sure what the cost or how i'd make it work with where the antenna is.. I was just going to fix it at a north to south direction...
Originally Posted by AE2CS
This is what i'm going for kind of, I also think its what your talking about..
Last edited by KD5WGK; 03-19-2011 at 06:28 PM.
making a GP out of a mobile whip
For a vertical adaptor like this the other half of the antnena would be three or four radials, attached to the frame near the coax connection, maybe at the mounting U-bolts. The single mobile whip becomes a Vertical Ground Plane, fixed station antenna.
The radial wires should be a few percent longer than a quarterwave length, for 10M about 8 1/2 ft.
A downward angle of 30-45 degrees actually helps get a very good match to 50 ohm Coax line. the ends should be insulated and can be tied to guy ropes to keep the mounting pipe straight.
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There are two simple options.
1 - make the whips into a dipole: use the mount, the whips face in opposite directions, one is common to the shield of the coax, one connects to the center wire of the coax. You can mount it vertically or horizontally. Your best bet overall is to mount it horizontally. It is easier. It will have a figure 8 pattern. You don't need a rotor, but stations will be stronger front and back and weaker off the ends. There is no reason to mount it vertically unless you are doing local work with other operators or repeaters using vertical polarization. Keep it horizontal.
2 - make a 1/4 wave vertical as described by K8JD.
A dipole will have some gain over the vertical and is easier to construct and get in the air. People will argue vertical vs horizontal polarization. I'm pretty sure you'll be happy with the horizontal dipole using the two whips if you get them trimmed down.
10 meters is hopping lately. I worked Italy and Curacao from my car on 10m just this afternoon using a 4' Firestik on a 5" mag mount and 100 watts, from a parking lot in New York City. The whip wasn't even particularly well tuned for the phone part of the band. You should do very well if you can get the antenna up nice and high. 20 feet is a good start. You'll have a good pattern. Try and get it higher and clear of all local obstacles.
The mount you want looks something like this, the coax connects to the right post and whip but only the center of the coax connects to the whip.
The other one is just welded to the bracket/ground/shield - the whips face in opposite directions and form a dipole.