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4 X 4 CB
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UK CB Radio Specialists - Expert Advice, Competitive Prices & knowledgeable staff, Est 1996

Installing CB Into 4x4's   Fitting the Aerial & Mount / Fitting a PSM-1 Mount
Fitting a 2-Bolt Rack/Bar Mount   |    Fitting a Bullbar / Roll Cage Mount   |    Fitting a Dome Mount   |    Fitting a Gutter Mount   |    Fitting a Magnetic Mount   |    Fitting a Roofrack / Roofbar Mount   |    Fitting a Widget Mount   |   

Click to download this page as a pdf so you can print it and take it out to your vehicle to refer to when doing the job - a lot easier than trying to look at it on a mobile phone!


You are here : Installing CB Into 4x4's / Fitting the Aerial & Mount / Fitting a PSM-1 Mount
Our PSM-1 mount shown here with a 5m lead
Our PSM-1 side/rear mount shown here with a 5m lead - this mount is a very popular mount for the back of Land Rovers etc

Installing one of our PSM-1 mounts is very easy...

What you need to do to install a PSM-1 mount :
Using the supplied metal plate as a template, drill two holes in the mounting surface, making sure the top one is large enough for the white insulator to pass through (this insulates the bolt from touching the bodwork)... rub/scrape/sand the inside of the panel so that when the metal plate is mounted inside it will make a good metal-to-metal connection with the panel... slip the cable connection ring terminals over the bolts and do them up tight... job done!

(There is a way of getting an earth connection without making metal-to-metal connection at the mount - see the "Installing without metal-to-metal connection" section below)

You will need an SWR meter (a basic and easy to use test meter) to make sure you have a good earth between the mount itself and whatever you have fitted it to. If you don't have a good earth, you will have a very high SWR, and this can damage the CB, so to be sure you should check it with an SWR meter.

Most of our aerials (Springers etc) are about the right length to give a good SWR reading if all other factors are ok (some suppliers call this "Pre-SWR'd" which is rather misleading as a good SWR depends on a number of factors, not just the aerials length), but using the meter to check, and fine tune (usually by adjusting the aerials length) if necessary, as well as check that you have a good earth/ground plane, is essential.

Read our SWR meter guide.


PSM-1 Physical Specs :

  • Size : 40mm Wide x 79mm High
  • Maximum mounting surface thickness : 10mm
  • Standoff from mounting surface to outer edge of mount : 50mm
  • Standoff from mounting surface to centre of aerial mounting hole : 35mm
  • Hole size required for upper bolt : 10mm
  • Hole size required for lower bolt : 5mm


Metal-to-metal earth :
You don't have to go mad with a sander or file, but you will need to get a clean metal-to-metal connection between part of the metal backing plate and the panel you are fixing the mount to. You might find it best to get back to bare metal where the corners of the plate will go (one corner is actually enough, you only need a few square mm of contact area) and bend the corners in very slightly so they dig in a bit.

The cable attaches to the mount by ring terminals, the inner wire to the large bolt, the braided shield to the smaller one
The cable attaches to the mount by ring terminals, the inner wire to the large bolt, the braided shield to the smaller one
The holes needed for the PSM-1 mount, shown here on the side of a Land Rover Discovery
The holes needed for the PSM-1 mount, shown here on the side of a Land Rover Discovery
Here the customer went a bit over the top with getting a good metal-to-metal earth, but at least it's sure to make a good contact
Here the customer went a bit over the top with getting a good metal-to-metal earth, but at least it's sure to make a good contact!
Here is the same install, with the PSM-1 mount in place
Here is the same install, with the PSM-1 mount in place

IMPORTANT : On alluminium bodied vehicles (Land Rover Defenders & Series Land Rovers etc) the exposed metal will oxidise which over time will break down the earth connection you've just made.

    There are two solutions to this which should be done immediately after you've installed the mount :
  • 1/ Paint over the area where the mount and panel meet with a zinc based paint - "sealing" them together, and preventing oxygen from getting to the exposed metal. (Rust inhibiting paints like Red Lead and many primers are zinc based).
  • 2/ Do the same basic thing as above (sealing the contact point against air) but use an aerosol plastic seal spray which is much easier, but might need recoating occasionally.


Installing without metal-to-metal connection :
If you cannot make a metal-to-metal connection at the mount, there is a way you can still get this mount to work correctly for you :

  • You can run an earth wire from to a convenient earthing point

If you choose to use an earth wire or earth strap to make the ground contact then the wire should be as short and thick as possible to get the best connection, and should be attached to the smaller (lower) bolt mount.

This method of obtaining an earth connection will work ok, but you will get slightly less range than if you had made the earth connection at the actual mount because the further the aerial is away from it's earth, the higher the angle of radiation will be - so you'll be sending signal up at something like 45 degrees, instead of a much lower angle, along the ground.

A PSM-1 mount with an earth wire attached
A PSM-1 mount with an earth wire attached
A PSM-1 mount with an earth wire attached
A PSM-1 mount with an earth wire attached

Mounting on the back of Land Rovers & similar :
The PSM-1 mount is a great mount for mounting an aerial on the back of a Land Rover... it has several things going for it :

  • It's looks quite neat
  • It's pretty strong
  • It keeps the cable on the inside of the vehicle, so it can't get damaged by branches etc
  • It's easy to make the earth connection
One of the factors that contribute to getting a good SWR is that the aerial shouldn't have too much metal close to it, so this mount needs to go high up on the vehicle so all (or nearly all) of the aerial is above the roofline...if the aerial is close to metal, this can affect the SWR reading - if it's not too much of the aerial then you can sometimes tune it out by cutting the aerials whip, but it's worth bearing the following in mind :

Most aerials are electrically 9 feet long... for example our Mini Springer Aerial is physically about 3 feet long, so theres 6 feet "coiled up" in the spring at the bottom. The Large Springer Aerial is physically about 5 feet long but is the same electrical length so theres about 4 feet of the aerial coiled up in the spring. Looking at the example of the Mini Springer again, you can see that 2/3 of the aerial is in the coil so if the coil is behind your roof, effectively two thirds of your aerial is behind the roof!

The most common place to put this mount on a Land Rover is right at the back on the drivers side (so that when driving on the road, the aerial is on the opposite side of the vehicle from trees and overhanging branches at the side of the road, and closer to the middle of the road for going under arch bridges) although right in the middle is also quite often seen.

PSM-1 mount fitted to the back of a Land Rover Defender
PSM-1 mount fitted to the back of a Land Rover Defender
PSM-1 mount fitted to the back of a Land Rover Defender
PSM-1 mount fitted to the back of a Land Rover Defender
PSM-1 mount fitted to the back of a Land Rover Defender
PSM-1 mount fitted to the back of a Land Rover Defender
PSM-1 mount fitted to the back of a Land Rover Defender
PSM-1 mount fitted to the back of a Land Rover Defender


Other places you can use this mount
Because this mount can be used on any flat surface, it can be used to mount an aerial in a whole load of different places...

Here the customer welded a plate to his Land Rover Discovery spare wheel carrier to mount the PSM-1 to
Here the customer welded a plate to his Land Rover Discovery spare wheel carrier to mount the PSM-1 to
Some more views of the Discovery spare wheel carrier mounting
Some more views of the Discovery spare wheel carrier mounting
Here's a PSM-1 mount on the back of a Jeep Wrangler
Here's a PSM-1 mount on the back of a Jeep Wrangler
Another PSM-1 mount on another Jeep Wrangler
Another PSM-1 mount on another Jeep Wrangler
Here a PSM-1 mount is fixed to the back of a heavily modified Suzuki SJ
Here a PSM-1 mount is fixed to the back of a heavily modified Suzuki SJ
A close-up of the same Suzuki SJ installation
A close-up of the same Suzuki SJ installation
A PSM-1 mount on the upright of a roofrack
A PSM-1 mount on the upright of a roofrack
A PSM-1 mount on the back of a Toyota Hilux cab
A PSM-1 mount on the back of a Toyota Hilux cab
A neat install on the roof of an American day van, using our angle adaptor to get the aerial upright
A neat install on the roof of an American day van, using our angle adaptor to get the aerial upright
A close-up view of the PSM-1 on the day vans' roof
A close-up view of the PSM-1 on the say vans' roof
PSM-1 on the side of a Range Rover - according to the customer he gets a reasonable swr with the aerial in this position
PSM-1 on the side of a Range Rover - according to the customer he gets a reasonable swr with the aerial in this position
PSM-1 fixed to the scuttle panel of a Suzuki SJ
PSM-1 fixed to the scuttle panel of a Suzuki SJ
PSM-1 mount on the back of a Mitsubishi Pajero
PSM-1 mount on the back of a Mitsubishi Pajero
PSM-1 mount on the side of a Suzuki SJ
PSM-1 mount on the side of a Suzuki SJ
Not ideal positioning due to the closeness of the aerial to the body but here's a PSM-1 mount on a Land Rover Discovery
Not ideal positioning due to the closeness of the aerial to the body but here's a PSM-1 mount on a Land Rover Discovery
The Discovery is triple skinned at the back, so here a customer had to use hole cutting bits to get down the outer skin in order to make the connections to the PSM-1 mount
The Discovery is triple skinned at the back, so here a customer had to use hole cutting bits to get down the outer skin in order to make the connections to the PSM-1 mount
Here's an easier place to fix the PSM-1 mount on a Discovery
Here's an easier place to fix the PSM-1 mount on a Discovery
Here's an easier place to fix the PSM-1 mount on a Discovery
Here's an easier place to fix the PSM-1 mount on a Discovery
Twin PSM-1 mounts on the back of a Land Rover - only one can be connected to the CB
Twin PSM-1 mounts on the back of a Land Rover - only one can be connected to the CB
By 'shaving' part of the rubber seal at the back of the mount, the PSM-1 can be put on curved surfaces!
By 'shaving' part of the rubber seal at the back of the mount, the PSM-1 can be put on curved surfaces!


Product links:
PSM-1 mount with 5m cable
PSM-1 mount without cable
4x4 CB Radio Package Deals (all of which have the option of choosing this mount)

If you are buying one of our packages and will be installing in a LWB vehicle, you might like to have a 7m cable instead of the standard 5m one... you can upgrade the cable to a 7m one by adding this item to the basket along with the package : I Want a 7m cable instead of a 5m cable


More photos of the PSM-1 mount


You are here : Installing CB Into 4x4's / Fitting the Aerial & Mount / Fitting a PSM-1 Mount



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