Question about Midland 1001Z 40-Channels Base CB Radio

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Midland 40 channel 1001 CB radio. I can talk and receive with other units as long as they are close (maybe to 200 meters or so). After the signal gets a bit weaker to where less lights lite up, I can see that they are still talking to me, but I can't hear them. Turning the squelch ccw makes no diff. Also, I can not get "background" white noise when I turn the squelch all the way ccw, like you usually can on a CB. I was wondering if there is a way to adjust this. I have an old unit of the same type and have looked inside. I am familiar with adjustable coils and potentiometers, and noticed several of these, one, in particular, with wires coming from the comb. squelch/rf gain knob. If anyone has any tips for how I can correct this situation, I'd be most grateful. This unit is only a couple months old. It did seem to work properly at first.

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The light you see lighting up dictate how much power you have on transmit (TX) and the strength of your receive (RF) The more lights on transmit the stronger your signal. The more lights lit up on receive dictates how hard they are hitting your radio. Either by power or distance. Is this setup in your car or at you home? Many use a mobile CB in there home off a power supply. Either way I am very concerned about you only getting out a couple blocks. I will help you fix this. First your antenna is a major part of your set up. Spare nothing when buying this. I recommend Wilson 300 or higher for the mobile and IMAX 2000 for home. Some Wilson antennas tune and some don't follow the instructions that come with it and ask me if you are unsure. A good 50ohm coax is necessary too. RG58 or better. For just the CB in the mobile RG58 will do just fine. Now we get to your SWR (Standing Wave Ratio) which deals with return loss and reflection coefficient. To high of an SWR and you will lose a lot of your signal and you can burn up your radio. Your radio does not come with an SWR meter so you will need to purchase an SWR/watt meter and put it inline. The coax from your antenna will run into your meter and then run another coax from your meter to the radio and follow the instructions on how to adjust and check your SWR. So now we are at the point where your set up is properly set up and now to tune that radio up. These radios do not carry much power or have much modulation. The limiter in your CB is what limits the modulation. In your CB there is a pot that will adjust this. Here is what you need to do to get more power and more modulation out of your CB. VR2 is the modulation pot. Adjust this for maximum modulation. Now spread the coils marked LT5/LT12 just a little and spread the coils marked LT7/LT11 a lot. Being a new radio it should not need a receive adjustment at all. Moding the receive includes jumping the PLL and I don't recommend that. You may try to replace that potentiometer but outside of this and the steps above you should have a great CB when completed. Good luck, this should fix your CB set up just fine.

Posted on Mar 20, 2011

  • norskie Mar 20, 2011

    The unit is a mobile, in a Peterbilt truck. I think the coax is likely top quality, being factory installed from Peterbilt. The antennas might be the problem, as they actually got cracked going in and out of a shop with a low ceiling. I put on a couple others which had come off an older truck, and it seems that it was after this that the reception went downhill. I will start with the antennas and go from there. Thank you for your comprehensive response.

  • Iron
    Iron Mar 20, 2011

    Your very welcome. Some older antenna just don't function like they should. Do you have your antennas screwed into a mirror mount? If so did the mount crack at all? This has happened before too. Sounds like we might have found the problem though. Glad I could help. Any other questions feel free to ask me. Hammer Down - 73

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