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Old 05-17-2018, 09:49 PM
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My newb CB setup, high SWR is ok?

I planned this out knowing its not ideal but I didn't want to put a CB radio antenna on the jeep.

Have a combo short fm CB antenna, midland 75 portable radio, grab bar mount, fm antenna multiplexor adapter for CB.

Looks exactly how I want it. Wasnt sure how to test it (I dont think there are any CB users in my area) I get the weather channel with the rubber ducky on portable mode. When hooked to the fm antenna I get a weaker weather channel and occasional static voices. So I guess its stronger? Tried switching during a heard conversation and rubber ducky lost it totally.

Decided to get an swr meter and the readings are off the charts. Bought this for strictly trail use since its required for the group , not to talk to anyone of any real distance. Will these high swr readings affect anything? Radio reception is perfect.





Also found if I cut the radio plate in half it fits perfectly. Can bolt up the top dash now.

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Old 05-17-2018, 09:59 PM   #2
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You will fry it in no time. You need a cb antenna

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Old 05-17-2018, 10:10 PM   #3
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The preferred SWR is 1.5, or less. What you are reading, will burn out the transisters..
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Old 05-17-2018, 10:35 PM
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Is it reading high because of the multiplexor? Or will it really burn it out?

I guess it's not worth the risk. Time to research an antenna setup

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Old 05-18-2018, 12:13 AM   #5
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It is the antenna and you will blow the power transistors if you continue to run it that way. I had mine tuned the max legal and the first time I keyed I blew the transistors, swr over 3, lessened learned.
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Old 05-18-2018, 12:17 AM
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It is the antenna and you will blow the power transistors if you continue to run it that way. I had mine tuned the max legal and the first time I keyed I blew the transistors, swr over 3, lessened learned.
For now I will just use the rubber ducky then until I decide on a setup. Maybe get a telescopic for the handheld.

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Old 05-18-2018, 12:18 AM   #7
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There are some multiplexor systems that do work ok to good. The cheaper ones tend to have horrible swr and burn stuff out.
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Old 05-18-2018, 12:33 AM
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There are some multiplexor systems that do work ok to good. The cheaper ones tend to have horrible swr and burn stuff out.
This was actually the only fm antenna one I could find. If there is one that works and can be tuned I would definitely look into it.

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Old 05-18-2018, 01:08 AM   #9
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There was a post on one of the forums recently about a good quality one...will see if I can find the link.
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Old 05-18-2018, 01:16 AM   #10
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This is the same one we use in the plow trucks/big rigs.

https://www.rightchannelradios.com/p...tenna-splitter

Use with a tuneable cb style antenna. Can replace the stock antenna with a cb one.
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Old 05-18-2018, 01:19 AM
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This is the same one we use in the plow trucks/big rigs.

https://www.rightchannelradios.com/p...tenna-splitter

Use with a tuneable cb style antenna. Can replace the stock antenna with a cb one.
Awe yes. I did see that one. Same brand as what I have.

I didn't purchase that because it required a CB antenna and I already bought the fm one.

Now I would need a whole cb setup so might as well mount a separate antenna. Should have done more research.

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Old 05-18-2018, 01:40 AM   #12
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Check your current antenna ground as well, Its possible to get a high swr if the antenna is shorted to ground.
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Old 05-18-2018, 04:16 AM   #13
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If you are using the rubber ducky while having the car connector on the midland you are still using the Antenna that's attached to the vehicle...you need to block the two connectors with some tape in the adapter. Unless you are using the battery power pack becareful.
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Old 05-18-2018, 07:05 AM   #14
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I'm not familiar with your setup, but did the antenna and/or duplexer not come with tuning instructions?

What brand/model is the duplexer?
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Old 05-18-2018, 08:36 AM
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I'm not familiar with your setup, but did the antenna and/or duplexer not come with tuning instructions?

What brand/model is the duplexer?
No instructions. It's a procomm am fm antenna to CB multiplexor.

It does have a gain tubing knob but turning it in a direction barely moved the needle

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Old 05-18-2018, 08:48 AM
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If you are using the rubber ducky while having the car connector on the midland you are still using the Antenna that's attached to the vehicle...you need to block the two connectors with some tape in the adapter. Unless you are using the battery power pack becareful.
I have it blocked. Are you saying it's still not safe to use with the car adapter and rubber ducky?

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Old 05-18-2018, 10:40 AM   #17
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No instructions. It's a procomm am fm antenna to CB multiplexor.

It does have a gain tubing knob but turning it in a direction barely moved the needle

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Darn, I did a quick Google and saw the installation instructions.. There are no adjustments.

How about your antenna? Which one are you using and are there any adjustments there?

If not, you'r out of luck.. Other than making sure all connections are secure and there are no short circuits, there isn't much more you can do.
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Old 05-18-2018, 10:47 AM
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Darn, I did a quick Google and saw the installation instructions.. There are no adjustments.

How about your antenna? Which one are you using and are there any adjustments there?

If not, you'r out of luck.. Other than making sure all connections are secure and there are no short circuits, there isn't much more you can do.
It's a 24" antenna X. I actually really like it, the looks and performance but I guess for CB its not very good. I did read the caps make a difference so maybe if I pop this one off it might magically be in swr range lol.

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Old 05-19-2018, 05:15 AM   #19
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I have it blocked. Are you saying it's still not safe to use with the car adapter and rubber ducky?

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As long as you block the two little pin connectors that activate the vehicle mounted antenna you are good. With the rubber ducky antenna you're good to go.

I have the same set up but with an firestik at the back got everything on amazon and with a SWR meter I get good readings. Cable, mount adapter, antenna, and spring if you want one. I wouldn't use the setup you currently have.
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Old 05-19-2018, 05:51 AM   #20
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Sorry for the late input -
Isn't there something to do with ensuring your signal wave from the transmitter to the antenna has to have ~18 feet of antenna cable to keep the SWR down? Those that are using a CB/FM MUX device may be coming up a bit short?
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Old 05-19-2018, 06:37 AM   #21
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Try using the stock antenna. If your SWR is in the red, it will fry the radio. I've killed 2 so far. The first one I didn't realize my coax got crushed at some point and was in a dead short. The second radio, was from a poor ground on the mount. Now my SWR's are 1.5 and everything is working well.

At least Midland is nice enough to repair for free.
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Old 05-19-2018, 08:52 AM   #22
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guys like @sparky , @Mr. Bills , @Jerry Bransford and some others can help out and I think you will get more help if I move it to the communication and electronics section.
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Old 05-19-2018, 08:57 AM   #23
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From looking at your picture, are you sure you're not getting a false high reading from holding the mic and the meter too close together? When I was researching setting mine up I read that can happen so I tested it out and sure enough, my reading was good when holding the mic and the meter on opposite sides of my body, but in the danger zone when holding them a few inches apart.
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Old 05-19-2018, 09:17 AM
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From looking at your picture, are you sure you're not getting a false high reading from holding the mic and the meter too close together? When I was researching setting mine up I read that can happen so I tested it out and sure enough, my reading was good when holding the mic and the meter on opposite sides of my body, but in the danger zone when holding them a few inches apart.
I did not know this. Let me try it again. I did realize I wasn't supposed to test it in a garage so I tested again outside with no power lines or trees around.

Now I will test it again. I did read someone had the same setup but longer antenna x and it had a much lower swr.

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Old 05-19-2018, 09:20 AM
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As long as you block the two little pin connectors that activate the vehicle mounted antenna you are good. With the rubber ducky antenna you're good to go.

I have the same set up but with an firestik at the back got everything on amazon and with a SWR meter I get good readings. Cable, mount adapter, antenna, and spring if you want one. I wouldn't use the setup you currently have.
I'm limited on cb mount options because of my smitty bilt hd tire holder. The mounts I want I'm not sure will fit it. But that's where I wanted it to be.

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Old 05-19-2018, 09:58 AM   #26
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I did not know this. Let me try it again. I did realize I wasn't supposed to test it in a garage so I tested again outside with no power lines or trees around. Now I will test it again. I did read someone had the same setup but longer antenna x and it had a much lower swr. Sent from my SM-N950U using Tapatalk
You do NOT want to test it in the garage. Go to an open space, free of buildings, power lines etc. You're really making this harder than it needs to be. You can mount a CB Antenna and simply remove it when you're not using it. YouTube has dozens of videos on SWR tuning and CB set up. How are you getting power to the handset? You want power coming directly from the battery. Running power from inside the jeep from tapping a wire or power outlet can lead to interference and high SWR.
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Old 05-19-2018, 10:10 AM
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Tested it again with the mic 3 feet away from the meter. Same results.

Looks like the only solution is installing a cb antenna. Wish this had worked they way I planned it, would have been ideal for me. Oh well.

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Old 05-20-2018, 11:00 AM   #28
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I'm limited on cb mount options because of my smitty bilt hd tire holder. The mounts I want I'm not sure will fit it. But that's where I wanted it to be.

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I looked at Smitty bilt hd hinge on Friday as my buddy was thinking of getting one. It would simple to fab an antenna mount. it has a threaded hole on upper and lower hinge covered by plugs. Just take a piece of flat stock and bend in a 90* drill a couple of holes and spray painted it black. ez peasy.
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Old 05-20-2018, 09:48 PM
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I looked at Smitty bilt hd hinge on Friday as my buddy was thinking of getting one. It would simple to fab an antenna mount. it has a threaded hole on upper and lower hinge covered by plugs. Just take a piece of flat stock and bend in a 90* drill a couple of holes and spray painted it black. ez peasy.
These holes at the top? Not much room behind them to fit a nut.


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Old 05-20-2018, 09:51 PM   #30
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im sorry I thought you had the hinge as well. regardless there are places you can fab something. If you are only using it when on trails fab a bracket for the front end, which apparently on jeeps is the best place anyway.

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