Discussion in 'On the Road' started by KD2ERR, Sep 21, 2013.
How do I covert a mobile cb antenna to a 2 meter?
What type? If a mag mount, remove (bypass) any loading coil (in the base?) and cut to about 19".
TOM K8ERV Montrose Colo
Are there have any body like to use mobile on Echolink .
If the antenna is long enough you could cut it to 47.5 in for a 5/8 wave antenna.
This is great to know. I have a CB antenna just lying around and I still have the mount and the coax in the Jeep.
Use of available resources is an ancient and honored ham radio tradition. Kudos for exploring this possibility!
Would be a lot easier to just order a Hustler SF-2. It's a 5/8 wave all stainless steel base loaded whip antenna with a threaded 3/8X24 base which is the same as most CB antenna's. Its 49" long and can handle 100 wattts and designed for 2 meter.
I used to be a OTR truck driver and this was the best antenna I tried.
I've been told this by others as well. Would it be possible to make a 1/2 wave antenna from a 102" CB whip as well? I assume you could if you can make a 1/4 wave and 5/8 wave. If so, what would the length have to be for that? I'm looking for a cheap 1/2 wave option to fit in my current CB setup. I bought a 2 meter, 1/4 wave firestik, but haven't been overly impressed with it's performance. I'm thinking a 1/2 wave would perform better. 5/8 is a little too tall for my taste.
The 1/2 and 5/8 wavelengths will require a matching network, as they are nowhere near 50 ohms. I believe a 5/8 will be 150 ohms, the 1/2 higher yet (450?). I had a 5/8 that had a coil of (guessing) #16 solid, 6 turns .75" dia x 1.75" long. Ground at bottom, coax tapped in at 2 turns, antenna connected to the top. It would be impressive if one could convert the loading coil on the cb antenna to a matching network.
Also, the 5/8 will be quite a bit better than a 1/2 wave, and a 1/2 wave may be trouble on a vehicle as it is normally used WITHOUT a ground plane.
The commercial dual banders (144 & 440) are about 34" high and are 5/8 on 144. The center coil loads it properly on 144 to emulate the full 5/8 length, and on 440 the top and bottom halves are full 5/8 and the coil causes them to be in-phase. These are very popular for a reason. I use a 2m antenna that is 2 stacked 5/8 waves, SUPER performance but it is 98" total.
WAS mobile in 53 days, see www.omis.net
I hope you can get your mod done and working.
One of the best 2m mobile antennas I ever had was a Lil'Wil mag mount that I cut down. It just worked! It was awful on CB anyways. Go figure lol