Question about Midland Radio Communications

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Poor TX RX range

Hi, Eddie here writing from Germany..... when talking to work mates from my truck they say that I am very quiet to them over a distance of about 2 miles. Also I can be driving behind a work mate having a conversation without any problems but when we go our different ways I lose contact after about 3 miles....if that.

I have a brand new Sirtel Santiago 600 antenna (apparently very good) approx 1.5m on the cab and a second hand Midland 48 Plus 80 channel CB

Some one mentioned modulation....does anyone know how to adjust the modulation on one of these?

Would it make a difference if I changed the set to a 40 chanel version?

Shall I sell the cb and buy a brand new one :-) ?

Thanks in advance, Eddie.

Posted by on

  • IamEddie May 31, 2008

    Hi Benimur,



    thanks for your advice & tips.



    Metal mounting - yes.. got that already.



    PL connectors - I'll have to have a look at them because the antenna did not come complete and I had to connect them to the cable ends myself. Might be that I haven't got enough wire showing through the hollow points.



    SWR - Already done....just bordering on snipping the end I think..if I read it correctly, but I suppose if the PL connections are not properly assembled then the SWR reading is out the window anyway.



    Power mic - Good idea...what about an antenna amplifier? I read on another forum this might help....any advice on them? My antenna has a 300W output if that means anything for when/if I buy an amplifier.(can you tell by now that I haven't really got a clue about CBs)..I just know how to use them.



    I'll have to wait until Monday when I'm back to work but I will get back to you and let you know how things went.



    Thanks again for your fast response. Eddie.

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  • 6,966 Answers

Hi,

Since your concern is both on receive and transmit, the common denominator would be the antenna system. The antenna should have a metal mounting to serve as the ground plane. Said mounting/ground plane must be electrically grounded to the rest of the truck. The next area to check would be the PL-259 connector. It should be soldered/connected right with no shorting. Next would be the cable which should be low loss RG-58. Last to check would be the SWR of the antenna. Most mobile antennas could be fine tuned to a specific frequency/channel by adjusting its length. There would possibly be 1 or 2 Allen screws for this purpose. In some cases, it may be necessary to trim off a few mm of the rod.

On your concern re modulation, am afraid that your radio has built-in limiter so as to prevent over modulation and comply with European restrictions. Additionally, the Midland 48 Plus has been programmed to transmit only 1 watt in AM (4 in FM) when the display shows D or D2. Additionally, you might want to consider a power microphone.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

Posted on May 31, 2008

  • Louie  Role
    Louie Role Jun 01, 2008

    Hi again,,

    Depending on the laws governing radio communication in your area of operation/country, amplifiers may or may not be illegal; hence this has to be taken into consideration - what might be OK in Italy is not necessarily OK in Germany.

    In any case even having said that, CB amplifiers are designed to increase the RF power output of your transmission from the stock 1 or 4/5 watts (again depending on the country of use or whether AM or FM) to anywhere from 10, 25, 50, 100, 500, 1KW. Some known brands in the 100~150 watt range are Palomar, Black Cat, SoundAir and RM (Italy). One tech advice if and when you will be using an amplifier, ensure that on the CB radio to antenna (prior to amp installation) the SWR is a flat 1; use heavy gauge wires and connect straight to the battery; use ground straps; fine tune the amp to operate on 27MHz/11 meter (most of them were designed really for 10m operation).

    On the power mic, most brands works but get those with noise canceling such as Astatic. Additionally, try to get those with double grounding/shielding if you will pursue the amplifier.

    Cheers.


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