Question about Connex 3300 240-Channels Base CB Radio

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Got an A. P. Hill that will transmit and recieve but, no sound from the speaker or the external speaker jack. I connected my SWR/POWER meter and i get power out but, nothing thru the speaker even with the talk back switch on. Any ideas of what it could be?

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Here is a quick way to test to see if it is the speaker. Use a multimeter and set it to Ohms. Unsolder the two wires off of the speaker and touch the pos terminal on the speaker with the pos terminal on the multimeter on the multimeter. Touch the neg terminal on the speaker with the neg terminal on the multi meter. The meter should spike a bit and might crackle a bit as well. This says speaker is good. So then you know the problem is most likely the Audio Output Transistor (IC) In your radio you will look for IC8 on the board. It will be marked. Looking towards the back of the radio on the right side it will be a fairly long chip. The good news is that you can purchase one and install it if you are handy with a soldier gun.

Posted on Mar 19, 2011

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How can I fix SWR's spiking and staying spiked?

Turn the squelch all the way down to the point that you can hear the hissing from the speaker, when you release the transmit button on the mic you should hear the noise from the speaker and at that point the EXTERNAL METER should not be showing anything. IF it is then the radio is not stopping transmission when you release the microphone button. Instead of letting go of the microphone button, try unplugging it and see if it does the same thing. Also to note the SWR that you are showing when transmitting is not that high. Also can you post the make and model of the SWR meter that you are using?

Jun 10, 2013 | Cobra 29 NW LTD

1 Answer

When i unkey my mic, my swr lights come on. sometimes they flicker sometimes the dont, what is wierd is sometimes they stay on for a seccond or two and the meter show full

VR9, VR2 or VR15 may just be out of adjustment. This does assume you are transmitting signal and recieving.

It might not hurt to check with second SWR meter.

Depending on location, there is only a tiny possibility of residual capacitance causing this. However you might want to put a few neon bulbs around your base to monitor for stray RF. If there is stray RF, they will light up- no need to connect them to anything, you can tape them to convenient places you can see. If they do light up- check coax connectors- which you should really do as a routine anyway, and check coax for damage. Then add a flat braid strap ground to "earth bond" for the radio. Which you should have anyway,

Feb 08, 2012 | Galaxy Radios DX-95T Base CB Radio

1 Answer

I just need to know how to use it for conversations and what every turn dial means.

you need to hook this up to an antenna. If you are putting it in a car, you need a mobile antenna, if in a house, you need a base antenna. The antenna needs to be tuned for best SWR or you will damage the radio.

Starting from the left of the radio.

Knob 1. Volume/ squelch. The little knob does the volume of what you hear. Big knob squelches out static noise.
knob 2. Dynamike. This is the volume of your voice transmitted. Its how loud people hear you.
Knob 3. RF gain. This is the receive sensitivity. The higher you turn this, the further you can hear. There is almost no reason for you to have this anywhere but full.
knob 4. Delta Tune. This knob should be in the center. If you encounter some one transmitting off frequency, you can move your receive up and down frequency so you can tune that person in. It does not effect your transmit frequency.
Knob 5. CAL. This is to calibrate the meter for taking an SWR reading off the antenna.

Switches starting form the left.

Switch 1. Meter switch. S/RF - will show on the meter, Your signal going out when transmitting, and the signal coming in while receiving. SWR - will show on the meter, your SWR on that channel after you have calibrated the meter. CAL - This is used to calibrate the meter in conjunction with the CAL knob.

Switch 2. ANL - Automatic noise limiter. - This gets rid of electrical interference noise from the vehicle, or other interference sources. ANL/NB - This is the same as ANL, but with NB "noise blanker" This function blanks louder noises that may make it hard to hear people. It's kind of like an automatic squelch, but not nearly as effective as the actual squelch. Also, NB will lessen your receive in that, really low signals will be blanked out.

Switch 3. CB - the radio is in CB mode. This is the normal operation mode of the radio. You can transmit and receive as normal. PA "Public Address" - If you hook a PA speaker to the PA jack in the back, you can mount the speaker on the out side of the vehicle, and talk over it (Its loud). Also, anything you receive over the radio when not holding the mic key, will come over the PA speaker. This is useful when you are not in the vehicle, and need to hear when some one comes on the radio.

Switch 4. BRT and DIM - this is the brightness of the meter light and channel display. BRT stands for bright.

Switch 5. Normal and CH 9, When the switch is in the normal position, everything is normal, but when you flip it up to CH 9 it instantly puts you one channel 9 with out having to turn the dial. CH 9 is the international emergency channel. So it lets you go to Channel 9 quick. when you put it back to normal it will put you on the channel you were on.

Meter explanation. - You have 3 horizontal lines on the meter. the top line is your SWR (only when in SWR mode on the switch. The next one down is you Signal going out. And the bottom one is your signal coming in, in DB's. ***Also noted that part of the SWR line has a CAL )calibration mark. When you have the switch in CAL, and key the mic, you turn the CAL knob up until the needle is at CAL triangle, and then put the radio on SWR and key it. where the needle falls, on the top line is your SWR. If it is in the red your antenna is not tuned, and you can damage your radio.


It is important to tune your CB radio antenna to the proper length. The length must exactly match the wavelength of the frequency you transmit on. Or be really really close.

All Cb antenna's have a way to adjust the length of the antenna. If it's a mag mount, the metal whip can be slid in and out of a metal collar. Usually a set screw. If its a fiberglass whip, the way to tune it is on top. It either has a small metal rod with a set screw to adjust the length, or it threads in and out to adjust length.

Either type you have it will need to be adjusted for proper length. Here is how to tune the antenna to lowest SWR.

Some radios have a built in SWR meter. Some do not. If yours doesn't have an SWR meter, then you have to use an external SWR meter. Radio shack carries one, and you can find them cheap on ebay.

If you have a built in SWR meter or external, the procedure is the same:

1. Turn the radio to CH 20.(This is the center of the band.)
2. Switch the meter switch to CAL. (CAL stand for calibrate.
3. Key the radio. (Important. Do not talk while keying the radio.)
4. turn the CAL knob up until the meter hits the CAL mark.
5. Now while still keying the radio flip the meter switch to SWR.

Where the meter falls after that point is you SWR reading. If its above 3, that is real bad. 2 is not gonna kill your radio but its not the greatest. 1.5 and under is a good place to be, but the lower the better.

If your SWR is high, Here is how to find out if your antenna is too long or too short.

1. Turn to CH 1
2. Repeat SWR procedure. You must calibrate every time you do it.
3. Remember the SWR reading.
4. Turn to CH 40.
5. Again repeat SWR procedure.
6. Compare the reading between CH 1 and CH 40.

Now if the SWR is higher on channel 1 then channel 40 your antenna is too short. You must make it longer.

If the SWR is longer on channel 40 then on channel 1, then the antenna is too long, you need to make it shorter.

Make height adjustments about an eight inch at a time, and take reading each time.

once the SWR is significantly lower and the reading on channel 1 and 40 are about the same, you a about matched. At this point turn the radio to the center of the band, channel 20 and take an SWR reading.

You should now have a low SWR reading, 1.5 or under. If you are 1.5 or under, you are good to go.

If you cannot get the SWR to an appropriate level, there may be an antenna problem.

Nov 12, 2010 | Cobra 29 LTD CB Radio

1 Answer

Cant recieve or output , I bought a new cable and antenna plus a swr meter.

With an antenna connected, volume set to 1/4 from minimum, squelch / RF squelch fully counter-clockwise (or minimum) - do you hear anything from the speaker? If not - plug an earphone / external speaker into the external speaker jack on the rear - any sound? If not, do you see the S/RF meter needle moving (not resting on 0 or 1)? If not - find a channel with activity on as indicated by the S/RF meter first.

Try with another antenna connected if possible, or transmit with another CB radio on the same channel nearby - and try again.

If you aren't able to receive sound (not just static) - or indicated signals on the S/RF meter, the radio *MAY* need to be professionally serviced. Make sure you get an estimate for the work before authorizing - otherwise you may be spending more on a repair than the radio is worth. It is not uncommon to have to pay a diagnostic fee - that most shop will put toward the repair if allowed to do the work.

Good luck!

Sep 07, 2010 | Cobra 29 LTD CB Radio

1 Answer

I have no sound, even when I key mic. The meter goes up one time and not the next.

This could one or more of the following problems. I'll start with the ones I feel are most likely the cause, but you can check them in which ever order you like.

When the mic is keyed, you should not hear anything from the reciever. The mic's PTT (push to talk) button switches the transciever from recieve mode to transmit mode, if it didn't all you would hear and transmit would be screaching feedback. Also, during the transmit mode, the radio's meter should switch from indicating relative signal strength (or "S" units) to power out where 4 watts AM should indicate full scale deflection of the meter.

This makes me believe that you've got a intermittent connection in the mic circuit. This can be anywhere from inside the mic, mic cord, mic connector and inside the radio - from the mic jack. The cord is supect as it is always being twisted, pulled, stretched and strained under extremes of temperatures and humidity.

You can check the cord by simply replacing it or with a dummy load connected to the antenna, see if keying the mic and shaking the cable makes the power meter jump or bounce. Twist and pull the cord over its entire length - but pay particular attention to the strain relief points near the mic body and connector as these are typical points of failure.

Check contacts inside the mic, between the mic cord and plug, mic plug and mic jack on the radio to be sure there is no oxidation or broken / shorted wires.

There may also be a problem with a blow speaker, which would explain the lack of audio on the reciever. Connect an external speaker to the external speaker jack (if provided) or open the radio to connect a speaker to the one under test.

Least likely - but still possible is a fault with the antenna coax cable, antenna and / or mount. Look for split, crushed, or otherwise damaged cable along the entire length. Pay attention to pinch points, etc. Repair or replace as needed. Look for oxidation build up between the antenna and mounting threads - clean as best you can or replace. Check the coil (if any) on the antenna. Broken, burnt, etc.insulators over coils are indicators of a problems. Again, repair or replace as needed.

I hope this helps you identify the source of the problem - good luck!

Oct 30, 2009 | Midland 1001Z 40-Channels Base CB Radio

1 Answer


Always use an external meter to set SWR. If the ant. warning light comes on it indicates a problem with the SWR. Check it with external meter.

Oct 19, 2009 | Cobra 29 LTD CB Radio

2 Answers

President HR-2510 will not transmit or recieve

Hi Darrel,

Since you didn't say if you have ever used this radio successfully before, I have to assume it is "new to you" and that you have never seen it work or used one like it before. Start with a few basic settings below:

Turn Squelch to minimum.
Set RF Gain (if present) to maximum
Set Mode to AM or FM
Set volume to 1/3 up
Connect to 50 ohm dummy load.

Turn power on. Hopefully you hear static. If not, try SSB or FM. Still nothing? Try connecting to an external speaker.

Chnage back to AM or FM mode. Key mic check & for transmit indicator. If none, change mic or manually short the PTT contacts in the mic or at the radio to see if it can be made to xmit.

If no xmit - insert SWR meter between xmitter and dummy load. Try to xmit on AM or FM again while watching SWR forward power, if none indicated, xmitter is probably defective.

Replacing parts in a xmitter is not recommended. You'll need an FCC license and a fair amount of expensive test equipment to test repairs, set power levels and deviation and perform an alignment to be sure you aren't causing interference on other frequencies and bands.

You'd be better off bringing it to a radio repair shop for repairs and an alignment.

Sep 29, 2009 | Uniden Radio Communications

1 Answer

External jack

sounds like you got a good radio to practice on . If it was given to you then you have nothing to loose except what ever you put into it. try hooking the speaker jack back up, see what it does??

Apr 12, 2009 | Galaxy Radios DX-959 40-Channels Base CB...

1 Answer

No sound

It must be a bad internal speaker, but also check the external speaker jack for broken solder. Good Luck
NC Electronic
Mills, Wyoming

Dec 31, 2007 | Galaxy Radios DX- 88HL Base CB Radio

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