Question about Maxon MCB-30 40-Channels Base CB Radio

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No power I have tried to hook up my Cb to my truck but when i hook the positive and ground wires my Cb does nothing? any easy solutions would be helpful thanks.

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I think that you may have a power supply problem. I want you to first attach the antenna and then power up the unit. If nothing still happen, you will have to have the unit serviced. I would suggest that you get a schematic for the unit and then if possible get one of the shops on FixYa to take a look at your device. The reason I say this is because there are no user serviceable parts in the unit, and to open it up without having electronics experience is not adviseable. Thank you, Shuttle83

Posted on Sep 07, 2007

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Posted on Jan 02, 2017

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I have a Vintage kinematix reverb with 5 wires red,yellow,white,brown and black how I hook it up what are the wire? it also has a delay tuning knob


usualy you have a transmit recieve switch
like this
.....common
RX <<-- >TX ptt

so three wires
the ptt button common in a cb with 4 pins is also ground
should be
black screen and i think brown
but you need to meter out the ptt common and RX TX
for rx audio switched radios then one pin is RX one pin is TX one pin is common or ground for the PTT and also ground for the screening copper braids and also ground for the transmit audio
so you have 5 wires
3 will be PTT 1 will be audio and one audio ground
usually white or yellow
so i think black and yellow or black and white
black being ground

just look up the schematic or service manual for your CB
and check out the 4 pin plug config
there is only two usual ones
cybernet or uniden so.. easy stuff
look for like cybernet cb 4 pin wireup in google or similar
remember just meter out using the beep test range on a cheep multimeter too see which three are the PTT
so the common of the ptt needs connected to the copper screening and also to the black wire all to the ground pin on the 4 pin plug
you can short from the ground pin on the cb side to its TX pin and the set will enter tx mode
same with rx audio enable {if uses most cb post 1984 dont use RX audio hard switching}
so just three pins to worry about

Dec 03, 2014 | Radio Communications

1 Answer

How do you install a Maxon radio repeeter. It only has two wires that apear to be a Hot(Red) wire and a Black(ground). Should I just ground it and hook it up to a power suply?


Your correct the red wire is the positive and the black is the negative. You must also make sure to use a power supply with enough current to operate the radio. Usually a 12 volt supply that supplies about 4 to 8 amps should do the trick

Oct 29, 2011 | Maxon MCB-30 40-Channels Base CB Radio

1 Answer

I have my cb grounded and a wire ran to the postive side of my battery terminal and the antenna wire ran and my cbs channels wont come up we thought it was jus my cb so we hooked another up and it did the...


Hello,

Here is the deal, even with out antennas hooked up, you should get at least your channels on your cb showing, no of course you would have all noise and distortion with out antennas hooked up. And sense you hooked another cb up with same results it tells me, number one, it is not most likely your cb. If your channels are not even lighting up, then this tells me it is not getting power. I know you said that the cb is grounded, and there is a wire ran to the positive post of the battery. What I would do first of all make sure proper wire on cb is grounded and not reversed accidentally, but what i believe is your not getting power to the unit, if it was properly installed, there should be a inline fuse from the cb radio to the positive post the wire is connected to on the battery. I believe there is a inline fuse that is blow, or not a good connection on the post of the battery. To test this theory, take a long piece of same size wire gauge, and run direct from positive on battery to positive post on battery, of course making sure that the proper wire off the cb is grounded (must be grounded to something metal, might find different spot to ground the radio if not for sure on metal) If you get lights going on then on radio, then your problem, was not a good connection or inline fuse on positive wire that maybe you didn't see was blown. Let me know Mike

Aug 26, 2011 | Radio Communications

1 Answer

I think i shorted out my cb can i fix it


  • If you are referring to perhaps hooking up the negative and positive power wires backwards this should be an easy fix.
  • Remove the covers and look by where the plug plugs into the radio.
  • You will notice a 1N4001 diode on the circuit board. It will be black in color. This is the diode that blows when you hook the power and ground up backward.
  • Remove and replace with a new one. Pay attention to the "arrow" on the diode as it goes in one way only.
  • You can get two of them at Radio Shack for $2usd or so.
  • http://www.radioshack.com/product/index.jsp?productId=2036268


  • Hope this helps and thank you for using FixYa.
Regards, Tony

Aug 11, 2011 | Cobra 29 LTD CB Radio

1 Answer

I have a Connex 3300. I do not have original plug (power). however, I do have one that fits. I need confirmation this is the right plug. It is three wires. One black(neg.) and two red (positive). I...


The center wire doesn't do anything. Its the outer wires. You can get a standard CB plug with 2 wires that will work just fine. If that plug fits, I it will work. My concern would be if the pos and neg are the correct sides. It should be, But I wouldn't know unless I looked at it.

DO NOT HOOK the radio up with the power wires backwards. Or you will blow the polarity protection diodes. They are there to blow if the radio is hooked up backwards.

If you look at the plug. There is a side the goes to a point, and the other side is square. The black wire, Ground, should be on the side that goes to a point. If it does, then that plug is standard.

It's fine to use and hook up in the usual way. Do not hook up the center wire. It does nothing in the radio. You can clip it, and put a bit of shrink tube on the end as so it does not have a chance to short on anything.

If you are not sure about hooking this power cord to your connex, just go on ebay, and get a regualr CB power wire. They are cheap. It should only have 2 wires.

Sep 07, 2010 | Connex 3300 240-Channels Base CB Radio

1 Answer

I have everything hooked up but all i get is static. I had someone from radion shack check the ground and hookup and they said it all looked good. I have tried numerous CB's and different anntennaes still...


Truck boxes may be the best looking place to mount a CB antenna but in my experience they are the worst place for performance.

The 'ground' you need is not an electrical ground but an RF ground. The easy answer is that you need to mount the antenna to a mirror or the bumper or even use a magnet mount instead on the roof. The body of the vehicle provides an RF ground that the small truck box cannot. The only way it might work is to use flat, wide ground straps at all four corners of your box to the bed of the truck. You need metal-on-metal contact.

Feb 07, 2010 | Cobra 25 LTD 40-Channels Base CB Radio

2 Answers

Lots of engine noise


I would check all connections it might have bin installed wrong

Oct 25, 2009 | Cobra 29 LTD CB Radio

1 Answer

Uniden PC66a CB blows fuses upon installation


yes the problem is a diode on the input of the rig. this is black with a silver band at one end it will need replacing as it has shorted out.

Aug 05, 2009 | Radio Communications

1 Answer

PA squalls when mike pushed


Try running a temporary wire for grounding.
Tom

Jun 29, 2009 | Cobra 25 LTD 40-Channels Base CB Radio

2 Answers

Need wiring digram for road king 56 to cobra 29 cb


He is actually looking for the Microphone wiring which is a roadKing Mic to the Radio Cobra 29.

Apr 23, 2009 | Magnum DeltaForce CB Radio

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