Question about Galaxy Radios DX-959 40-Channels Base CB Radio

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Just purchased a new galaxy dx959. Coax and k40 10k watt antenna. Installed it in my peterbilt 379. I have a lot of background noise. I tried unhooking the coax from back of radio and the noise goes away. So I figure its not coming through the power cord. What can I do about this? Also can I turn up my vr 14 and vr 16 and get more audio?

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wcrave

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You probably have the 959 that has a MOSFET final. It is not recommended that you try to get more power/mod by just turning pots. This can shorten the life of the MOSFET drastically. I normally set the power output to 7 watts and the mod to 100%. This give around 30 watts peak on AM and around 25-30 watts sideband. You need proper test equipment to align the radio.

As far as background noise, this type of radio does have more that others. Make sure the Noise blanker and ANL are turned on. If you are getting noise from equipment in the vehicle, you should take your truck to a good CB shop. They can find out what is causing the noise and fix it.

....Don at NTCB, Inc.

Posted on Jun 29, 2011

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The problem is that the V73 has a very sensitive receive. It is picking up noise in the car. Most likely the smog pump, or fuel pump.

Here are a few things you can try.

First, lets make sure where the noise is getting into the radio. It will either be getting in via the power wire, or the antenna.

To find out, here is what you do.

  1. Turn the car on, and the radio on.
  2. unscrew the antenna from the back of the radio. Make sure you do not key the radio without the antenna hooked up. It will hurt the transmit section.
If when you take the antenna wire off the back of the radio, the noise goes away, then the noise is getting in via the antenna system. Solutions for this could be any of the following.
  • Bad coax or connectors. Replace the coax with new coax.
  • Antenna not ground, or poorly grounded. If its a mag mount antenna, make sure the membrane on the bottom is in tact and there is nothing in between it and the metal of the car. this is how the antenna is grounded. If its a rigid mount to the body of the car, make sure it is free of rust or paint where it is mounted.
To find out if the noise is getting in from the coax, or antenna.
  1. Hook the coax back up to the radio. The noise will be back.
  2. Disconnect the coax from the antenna if you can.
If the noise goes away, it is the antenna. Try a new antenna. If the noise doesn't go away, its most likely bad coax.

Now if when you disconnect the antenna wire, the noise is still there, then the noise is getting in through the power wire.

Here are some things you can do to get rid of the noise.

  • Connect power wire direct to the battery.
  • Twist the power wire.
  • Put a not in the power wire right at the plug.
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You Need to check and set you SWR on the antenna system. You may also have a bad coax or the ant studs ( mounting hardward ) for the antennas may be bad. It definally sounds like an ant/coax problem Good Luck
Ed
NC Electronic
Mills, Wyoming

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