First CB.
Discussion in 'CB Radio Forum' started by Crazyeyes, Oct 4, 2010.
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WHY WOULD YOU HAVE TO USE COAX TO MATCH A 50 OHM ANTTENA ?
A 1/4 wave wip is about 50 ohms at its feed point and a 50 ohm coax should be happy no matter how long it is . -
So I guess Im making slight progress here, but I still have some issues and questions.... Finally hooked up the 29 LX LE today but all isnt well.
I followed the manual's instructions on setting the gain control,dynamike,etc.. and did the calibration the manual also explained. Everything seemed alright cruising northbound up I35 as far as receiving transmission, however when I did the calibration I did notice the CB was reading "CB antenna warning," I have no clue what this means and since I was receiving transmission decently(or so I thought) I let it be. Now I get to a truckstop and Im finally going to mess around with the mic.... and nothing.... Several Mic checks and no response. And when I push the button in on the mic Im now noticing it is also again showing "CB antenna warning," only when the button is pushed down. This mic is a truckers series mic and there is a volume control on it as well as a slot for a 9 volt battery... I didnt think the battery was required... But I could be wrong and Im not sure if that is directly related to the CB antenna warning I am receiving.... Now I dont know much at all about antennas, but I do know my truck is equipped with one about 3ft. tall mounted on driver's side mirror and the wiring looked fine all the way through to the cb radio, If I need to get another I will gladly as well as the battery for the mic... Just trying to figure out what my exact issues are.....
Also some question about the wiring and power hookup of the CB... There is a cut out inside the cab just above my head/centered where the CB can me placed/mounted...(where the cb antenna is coming to,etc.... ) Now also in the hole are 2 pair of other wires(4 total.) Now what do they belong to? I peeled the electrical tape off off one pair as I just magically assumed i could connect CB's power to this set of wires.. Unfortunately, Neither one is marked for positive or negative..... Well, anyways as I was fooling with them to figure out posi/neg, I accidentally touched both hot ends..... Ohh La La, my interior lights all dimmed and it seems I must have blown the fuse to the CD deck as I no longer have power there.. Luckily, could've been something worse(hopefully I dont get any surprises.) Now Im still trying to figure out what they belong to and if it is alright to connect my CB to these wires? If its alright then I will leave CB in the hole up top, if not I wanna mount it on my dash..... Right now the CB is just connected to the standard red and black screw ins...
Is there an "extension cord" made for antennas? or if I want to get more length do I just need to buy one single cord longer than the one already installed? Couldnt find an "extension cord," type at truckstop............
I guess thats it for now, if anyone has answers or insight on these matters it would be greatly appreciated!! -
You do need a battery for the mic. Now as far as the antenna goes, I'm not the best person around here to be answering your questions, but since nobody else has, I'll at least tell you what I dealt with as it was similar. I had the same issues and tested 3 different radios and 2 different antennas. The antennas were not mine so I'm really not sure whether or not they were ok, but I would have thought 1 of them would have been. I wound up running my own coax to my own mount and antenna. That took care of that. The tractor I'm using already was set up with the required plug for a radio. I really don't know a whole lot about wiring and can't offer any help with that.
Crazyeyes Thanks this. -
I'd say your best bet would be to run your own coax and antenna to your radio, buy an SWR meter (read the instructions on it, it's easy) and get it set up right before you burn your radio up.
I finally got tired of cheap radios and what not, so I went for a spendy radio, Magnum S-3...guy I bought it from was pretty knowledgable and actually took the time to explain stuff to me...and took the time to set everything up right. Nowadays, everyone compliments me, or #######, about how well it works...not annoying loud but carries well.Crazyeyes Thanks this. -
A very quick way to match antennas is using a tuner it only TRICKS the radio into thinking it has a good load but the trick works ....
Using this tuner I can run from 3.5MHZ ( 75 meters ) to 52.525 mhz ( 6 meters ) on one antenna which was made to run from 40 - 10 meters ( 7-29 mhz ).Attached Files:
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It's just one of them CB myths and legends about tricking the radio into seeing what the owner WANTS to see. Didja know they's more than ONE SWR'zzzzzzzzzzzzzzzzzz in ONE feedline?


GET 'em to explain how come a multiband SCREWDRIVER mobile antenna covers EVERY frequency between 3.5 and 29 MHZ with ONE feedline of NO particular length with an "SWR'zzzzzzzzzzz" of 1.2 : 1 and its full EFFICIENCY!!!!!!!!! They CAN'T!!!!!!!!!!!!!!!!
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How does it work, does it bleed the reflect off somehow? Sort of like a dummy load, but just for the reflected power?
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Sorry Bruce, I'm part of the ADD generation, and immediately googled it..I came up with this.
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Josh your question is really a good one .....
How most work is to act like a TRANSFORMER allowing you to tap on it and just like the transformer you would use to change 120 volts to 12 volts you can match the output of the antenna to the radio ......
http://mfjenterprises.com/man/pdf/MFJ-945E.pdf
you can build your own if you want.josh.c Thanks this.
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