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I can't hear my Galls street Thunder siren model xs100.

I can only hear a little bit of sound kind of a whining noise from the inside of the siren itself. It was wokring fine and the 100 watt speaker was outputing the sound for about 5 mintues until all of a sudden it stopped. all connections are good. what else? the speaker cannot be blown because its brand new and its what the siren calls for. (100 watts) Can anyone help me?

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  • ofc_garcia Dec 29, 2008

    check your connections and wiring to see if any loose contacts are loose.

  • gstwin Feb 26, 2009

    Does teh PA part work?

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Bad output transistors or integrated circuit

Posted on Jan 01, 2009

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The remote or Aux input does not work on my Galls Street Thunder xs100. I hooked up a switched ground lead, no result. I hooked up a switched positive lead, no result. Any ideas??


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CB radios are AM radios operating in the 27Mhz band and are prone to noise even in home installation (though admittedly not as much). A signal on the meter that causes the indicator to move up to as much as 1/4 of the scale is actually pretty good for a mobile installation with the engine running. There are ways to minimize the noise, but none will eliminate it. Here are suggestions - in no particular order:

1) A well grounded antenna. Since you've got metal to metal contact with yours it shouldn't be a problem - the magnetic mounts are more prone to interference and noise that yours.

2) Locate the antenna on a large, flat, horizontal, metal surface. Mobile installs are always a compromise - but the more of these you can incorporate, the better the reception & transmission will be. There will still be noise - but when you receive better signals the "S/N" or "signal to noise ratio" increases - making the sound less noisy.

3) Tune the antenna for lowest SWR (standing wave ratio). You'll need an SWR meter to do this. Be sure to get one that will tune HF antennas - or at least one that works in the 27Mhz band. This is another method of improving the S/N ratio mentioned above. An untuned antenna can cause a transmitter to fail - so this is a must for any transmitter's antenna.

4) Obtain the power directly from the battery. Not the accessory terminal or battery terminal under the dash - but to the battery posts themselves. This is the cleanest (power-wise) source in the vehicle.

5) Install filter on the power lines feeding the radio. A rising and falling (with engine RPM) whine sound is usually alternator noise, and a popping sound is ignition noise. The whine sound can be helped by install a capacitor and the ignition noise by using an inductor or coil. So, if you have both noises, you'll need both filters.

6) Install resistor spark plugs and wires. Years ago, we had to get these as an aftermarket item. I don't know if those supplied by auto manufacturers are resistor types or not - so it may be worthwhile to check it out.

Some vehicles benefit greatly from one or more of these solutions, others - not so much. Some vehicles have noisy subsystems unrelated to ignition or alternator. Some tank mounted fuel pumps can be brutally loud and difficult to silence (check with radio on, and turn the key to run - the fuel pump usually runs for a few seconds - listen for static while the pump runs before starting). The vehicles that will probably have good luck are those that you see used as police, taxi and ambulance vehicles due to the radios and electronics in them.

I hope this helps and good luck! Please rate my reply - thank you.

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I have a midland 75-822 micro mobile-portable cb in my van. a lot of static and i was wondering how to correct it. thank you kindly.


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Do you have talkback installed? If you do, it is too loud and this is what is causing the squeal. Try turning down the dynamic.

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1 Answer

I transmit fine but unless im close to someone when they talk the static over rides them and i can not understand them and i am also picking up alternater noise


Interference / noise elimination can be a test for how much money you want to spend and how deep you're willing to look. CB radios are AM and prone to noise. Here are some things you can try to eliminate or determine the source of the noise. Understand that there are only 2 ways for noise to enter the radio: power leads or antenna lead.

Connect the power leads directly to the battery - not the accessory terminal of the fuse block - nor "tap" into an existing 12 V power line you happen to find. Turn the radio on to an unused channel - it should be fairly static free. Turn the ignition key to the RUN position. It should still be clear - but if you hear a sudden spike of noise that lasts a few seconds before stopping, the static is likely to be coming from your fuel pump in your gas tank. The pump runs to pressurize the fuel lines to the fuel injectors when the key is turned to START. The Ford Explorer is notorious for this - but cab be reduced by following this link. It may work for your car, too.

Turn the ignition key to start the engine and let the engine run at idle speed. Listen to the radio as you vary the RPM from idle to 1000 - 1500 and let settle to idle again. Popping sounds that keep time with the speed of the engine is likely yo be ignition noise. This is caused by the high voltage (10,000 + volts) ignition system that provides spark for combustion in the cylinders. You vehicle may have more than one location where spark occurs. The spark plugs, distributor cap, rotor and coil are the primary sources of ignition noise. Replace broken, cracked, or otherwise damaged components and change the wires and spark plugs to "radio resistor" types. If a rising and falling whine is heard, the source is likely the alternator.

If there was no change - disconnect the antenna from the connector at the back of the radio. If the sound magically goes away - the vehicle and radio power are filtered very well - the noise in entering via the antenna lead.

Install a "filter" on the radio power leads - as close to the radio as possible. The power leads act like an "antenna" for all kinds of under-hood noise sources and carry it right into the radio.

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If the noise is getting in the coax cable, make sure your antenna is well grounded. Resist the temptation to use a "mag mount" as the ground is poor if not non-existent. Some have had some luck using snap choke cores but I haven't used them myself.

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Please rate this if it was helpful - good luck!

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Dennis

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