Help: CB on modjob

[Mustang]

where might the cb be mounted during a mod? other than a saddlebag

[TNT]

Under the seat in the box where the tools go

[Mustang]

Under the seat in the box where the tools go

the tool on an IS go in the left saddlebag, but I will look under the seat for space

Thanks Vicki

[TNT]

On the bike I just bought, which was a tourer, there was a space behind the battery and the box fit right down in there. Good Luck!

[Jeff K]

I put mine here. It took some cutting but it fit fine. I had to cut the divider out, then I cut the bottom edge of the "pocket" so it would be wide enough.
http://www.jkozloski.com/pics2/New%20valk%20and%20virago/dcp_0605.jpg

[Mustang]

I put mine here. It took some cutting but it fit fine. I had to cut the divider out, then I cut the bottom edge of the "pocket" so it would be wide enough.
http://www.jkozloski.com/pics2/New%20valk%20and%20virago/dcp_0605.jpg

Thanks Jeff, I looked and that is where mine is going, then figure on how to extend the anntnae wire. I am going to mount them on my bag rails

thanks again

[Jeff K]

Go to a CB shop. The antenna wire has to be the correct length. It is figured in some magic CB antenna formula. And no I'm not joking.

[shftr]

here some good links about CB and antennas. :D

http://www.signalengineering.com/ultima ... ennas.html (http://www.signalengineering.com/ultimate/mobile_antennas.html)

http://www.firestik.com/index.htm

http://www.worldzone.net/ss/spacecase/search.html

[hotglue]

I remember years ago, we set up a base unit CB out in the shop. A 30 by 40 building with a metal roof. Mounted a 102" whip dead center, on top. Seemed to talk pretty good.

[Smilin Jack]

Antenna lengths are pretty easy to use
below is a table of CB radio Frequencies and corresponding channels
PART 95--PERSONAL RADIO SERVICES--Table of Contents

Subpart E--Technical Regulations

Sec. 95.625 CB transmitter channel frequencies.

(a) The CB transmitter channel frequencies are:

------------------------------------------------------------------------
Channel No. (MHz)
------------------------------------------------------------------------
1................................................. ............. 26.965
2................................................. ............. 26.975
3................................................. ............. 26.985
4................................................. ............. 27.005
5................................................. ............. 27.015
6................................................. ............. 27.025
7................................................. ............. 27.035
8................................................. ............. 27.055
9................................................. ............. 27.065
10................................................ ............. 27.075
11................................................ ............. 27.085
12................................................ ............. 27.105
13................................................ ............. 27.115
14................................................ ............. 27.125
15................................................ ............. 27.135
16................................................ ............. 27.155
17................................................ ............. 27.165
18................................................ ............. 27.175
19................................................ ............. 27.185
20................................................ ............. 27.205
21................................................ ............. 27.215
22................................................ ............. 27.225
23................................................ ............. 27.255
24................................................ ............. 27.235
25................................................ ............. 27.245
26................................................ ............. 27.265
27................................................ ............. 27.275
28................................................ ............. 27.285
29................................................ ............. 27.295
30................................................ ............. 27.305
31................................................ ............. 27.315
32................................................ ............. 27.325
33................................................ ............. 27.335
34................................................ ............. 27.345
35................................................ ............. 27.355
36................................................ ............. 27.365
37................................................ ............. 27.375
38................................................ ............. 27.385
39................................................ ............. 27.395
40................................................ ............. 27.405
------------------------------------------------------------------------


to find the length of an antenna divide the frequency into 468. that is the length of a half wave dipole... but bikes use 1/4 wave.

example Channel 39 is 27.395 so
take 468/27.395 this equals 17.03 feet for a half wave.

a quarter wave would be 8.5 feet or in inches 8.5 X 12 =102.5 inches.
Where as channel one is 26.965 or about 104.13 inches. Your feed line or coax has to be a multiple of this half wave lenght number approximately. . That is why you are normally supplies almost 10 feet of coax with an antenna.... to match the frequency.

When you adjust an antenna for SWR you are fine tunning the length of the antenna for a specific frequency so get the lowest Reflected power. The less reflected the more goes out.... simple ......

So now that you are all educated... the coax you connect to the antenna has a center connection which goes to the whip antenna and the outside of the coax is a braid that connected to the base of the antenna.the part you fasten to your metal luggage rack or whatever. Make sure you fasten the mount to good metal which connects to the rest of the bike and not into some plastic fender. This is not an electrical connection to a battery just the metal of the bike since the bike is acting like the other half of the antenna to make it 17 feet long... understand? half postive and half grounded to the metal of the bike.... but you only see the whip. but the bike is actually the other half of the quarter wave antenna the ground half. With out the mount fastened to metal there is no ground plane for the signal to radiate from the whip....and you will most likely get a popping sound on your transmitter or a loud squeal. This is because the transmitter is trying to shut down to protect the amplifier in the radio buy an automatic circuit which shuts down the transmitter when the SWR is too high or the antenna is totally incorrect for the transmitter. Do not cut a premade coax cable..... it is cut for the length of the antenna and frequency your operating on.

Now you have a stainless steel whip antenna, why is it only 3 feet long... see that black tube in the middle of the antenna.... that is a coil of wire..... making it 103 inches long approximately

This is more than you need to know but it is basic knowledge that you might want to know. A very difficult subject that volumes of books have been written about...... so don't make it too hard....you'll lose too much sleep over it..

Smilin' Jack