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post #1 of 18 (permalink) Old 04-09-2016, 05:45 PM Thread Starter
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Default CB antenna

Has anyone had experience installing a ground plane CB antenna on a cross bike. Do we have enough metal on the bike for a ground plane CB antenna to work?

How low were the SWR's?

I know an NGP antenna will work but what about Ground Plane?

Thanks

Richie271
Long Island, NY
2010 Cross Roads. Midnight Cherry.
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post #2 of 18 (permalink) Old 04-09-2016, 10:23 PM
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Maybe these photos of a CB antenna mount I fabricated will help.
Attached Images
File Type: jpg CB INSTALLATION 020.jpg (49.9 KB, 9 views)
File Type: jpg CB INSTALLATION 021.jpg (50.5 KB, 6 views)
File Type: jpg CB INSTALLATION 025.jpg (46.9 KB, 6 views)

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post #3 of 18 (permalink) Old 04-10-2016, 11:46 AM
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That looks good. But what did you do with your fm antenna ? I am trying to find a CB for my '11 but no luck. I really don't want to go J&M but I may have to. I really want a Vic CB.
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post #4 of 18 (permalink) Old 04-10-2016, 01:16 PM
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Quote:
Originally Posted by rich49 View Post
That looks good. But what did you do with your fm antenna ? I am trying to find a CB for my '11 but no luck. I really don't want to go J&M but I may have to. I really want a Vic CB.
No fm antenna, I have a Cross Roads. The J&M CB was the only way I could go.
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File Type: jpg CB INSTALLATION 024.jpg (41.1 KB, 5 views)

2010 Midnight Cherry XR. 7Jurock, Lloydz AF, ATS, AFR tuned VFCIII, IAV, and T-6 and locally repacked pipes = big smiles. SOLD to a dear friend, so it's still in the family."
2017 Spyder F3 Limited - keeps this old guy in the wind and riding with friends.
Cure that ugly stand up license plate with the cheapest and best laydown bracket. Click this:
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post #5 of 18 (permalink) Old 04-10-2016, 06:05 PM Thread Starter
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Ricz, Very interesting pictures.

What antenna are you using with that mount?

what is you SWR reading using that mount and antenna?

I wish I could afford the J & M CB.

Thanks

Richie271
Long Island, NY
2010 Cross Roads. Midnight Cherry.
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post #6 of 18 (permalink) Old 04-10-2016, 06:17 PM
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J&M supplies antennas that are already SWR'd and work fantastically well. I have a 2' and a 3'.

2010 Midnight Cherry XR. 7Jurock, Lloydz AF, ATS, AFR tuned VFCIII, IAV, and T-6 and locally repacked pipes = big smiles. SOLD to a dear friend, so it's still in the family."
2017 Spyder F3 Limited - keeps this old guy in the wind and riding with friends.
Cure that ugly stand up license plate with the cheapest and best laydown bracket. Click this:
https://www.victoryforums.com/11-ven...t-x-bikes.html
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post #7 of 18 (permalink) Old 04-10-2016, 07:10 PM Thread Starter
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Quote:
Originally Posted by RICZ View Post
J&M supplies antennas that are already SWR'd and work fantastically well. I have a 2' and a 3'.
From what I have learned, No CB antenna is, (already SWR'd). They all have to be adjusted on the bike using an SWR meter. That goes for both the Ground Plane and No Ground Plane antennas. The only antennas that don't need adjusting are the (rubber duck) antennas on a portable hand held CB.

This from a major CB radio company.

"The Antenna must be tuned for all applications. Factory systems, aftermarket ad on’s, replacement antennas, it makes no difference. The antenna SWR MUST be set! There is no pre-tuned antenna."

I just found this on the J&M web site.

Note: This antenna has been designed to mount to your motorcycle easily and
attractively. The antenna staff has been pre-tuned specifically for use with J&M’s
JMCB-2003 CB. No further tuning is required.

Go figure,

Every thing I have learned says that a CB antenna must be adjusted for each installation.

Richie271
Long Island, NY
2010 Cross Roads. Midnight Cherry.

Last edited by Richie271; 04-10-2016 at 07:31 PM.
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post #8 of 18 (permalink) Old 04-10-2016, 07:30 PM
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What can I say Richie? After years of producing their CB/Intercoms, J&M finally realized that everything is pretty much the same no matter what bike it goes on. The coax is the same length and bikes offer pretty much identical ground planes. When I first installed my unit, all J&M offered was a generic adjustable antenna and I had a terrible time tuning it - couldn't get any range. I called John and he said they just came out with pre SWR'd antennas and he sent to me a couple and they work very,very well. Now if you're installing a CB in a cage, then that's another story and you'll have to custom SWR the antenna.

2010 Midnight Cherry XR. 7Jurock, Lloydz AF, ATS, AFR tuned VFCIII, IAV, and T-6 and locally repacked pipes = big smiles. SOLD to a dear friend, so it's still in the family."
2017 Spyder F3 Limited - keeps this old guy in the wind and riding with friends.
Cure that ugly stand up license plate with the cheapest and best laydown bracket. Click this:
https://www.victoryforums.com/11-ven...t-x-bikes.html
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post #9 of 18 (permalink) Old 04-10-2016, 07:38 PM Thread Starter
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Ricz

Please see my updated post. I found the instructions for the J&M radio and it is as you said. No tuning necessary. Wow, that is a great feature. A real time saver.

I still would like to see what the SWR's are on the completed installation.

How come you ended up with two antennas?

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post #10 of 18 (permalink) Old 04-10-2016, 07:43 PM
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John knew I had 2 generic ones, so he duplicated them. I didn't tell him when I bought them that one was for a friend. I use the 3' one when I have the Lock & Ride backrest & rack on and a rackbag. The 2' one is used when the rack is off. Both work equally well, but the 3' affords a bit more range.

2010 Midnight Cherry XR. 7Jurock, Lloydz AF, ATS, AFR tuned VFCIII, IAV, and T-6 and locally repacked pipes = big smiles. SOLD to a dear friend, so it's still in the family."
2017 Spyder F3 Limited - keeps this old guy in the wind and riding with friends.
Cure that ugly stand up license plate with the cheapest and best laydown bracket. Click this:
https://www.victoryforums.com/11-ven...t-x-bikes.html
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