Question about Uniden PC78ELITE 40-Channels Base CB Radio

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Short wave hi i have a trc 48 std 5 watts on a clr 2--.5/8 wave.. i can here short wave radio not all the time but it fads in and out just in the day time.

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  • lars ahlsen May 11, 2010

    Hello...i'm sorry but are you refering to broadcsat stations or foreign voices that seems to be communicating..? pse tell me...Ron



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  • 46 Answers can try something called a HIGH-Pass filter that cuts off the lower frequencys...and only allows the 27 Mhz Band. pse contact your supplier they know what it is !..i think it is an combination of atmospheric conditions and that your radios 1:st hf amplifier/mixer isn' narrow enough, combined wih the 1'st mf -frequency....good luck Ron.

Posted on Mar 12, 2008

  • lars ahlsen Mar 15, 2008

    Hello have you changed your login,,:? that is making this conversation hard to make right..i hope you remember "kr 750" that was your first "header".....i don'now how to fix this but maybe "sysop" can........Ron...



Hi..yes i here broadcast stations and foreign voices..i know its
shortwave..but it fades in and out.. like skip. ch 8 will have the same broadcast as ch23. or ch3 or ch11.. but like i said it fads in and out..thanks for your help

Posted on Mar 11, 2008


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I have a Realistic TRC-457.It has very low power and modulation.It is a virgin radio other than someone has replaced the final and driver.I noticet that I cant set the modulation and swr levels on my dosy...

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I need to know what colers go where on the mic pin for a trc 447 thank you

I don't know which mic you're trying to wire to this radio. The colors of the wires in the mic cable may change from one mic to another, so relying on the color is not reliable. Usually you refer to these connections as Pin1 to a Signal or Function; or Jack Pin1 to Plug Pin3. No one assumes a color will always be used to connect Pin1 to TX (transmit).

With that said, I found an answer on FixYa from someone that answered the question some time ago like this:


4.)CH.Down / Shorted to Ground
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Be extremely careful when wiring this radio! pin 4 and pin 6 carry voltage shorting these to the wrong place can result in serious damage to your radio.

Lastly, since I doubt what was provided above is going to help you very much - you can review all the info ever printed by Realistic on your radio, here. There's a wealth of info on this page and you should be able to find what you're looking for in it. You're looking to find the pinouts of the radio to the pinouts of the mic.

If you ever have to disconnect a multiconductor cable from a connector, and you don't have the time or means to write the colors down, it is better to simply cut the cable - leaving all the colored insulation of wire ends soldered / still secured to the connector. When you are ready to do the replacement of the connector or cable, you've got the wiring order in place still, and can make the new connections one at a time at your leisure.

Good luck!

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Need to replace microphone on a Radio Shack TRC 447 CB. 6 pin Anybody know?

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Tunning the antenna on radio shack cb trc-447

After installing the antenna, follow these steps to adjust the
standing wave ratio(SWR).
1. Turn on the CB.
2. Set S/RF/SWR/CAL to CAL.
3. Key the Mic and rotate SWR CAL so the meter points
to CAL.
4. Unkey Mic.
5. Set S/RF/SWR/CAL to SWR.
6. Key Mic again and note the actual measurement on
the SWR scale. Refer to the following table to interpret
the reading.

1:1 - 1.5 Great
1.5 - 2:1 OK
2:1 - 3:1 Not So Good
Higher than 3.1:1 Terrible

The ideal standing wave ratio (SWR) is 1:1, or a meter
reading of 1 on the SWR meter's top scale. A SWR ratio
of 1.5:1 to 2:1 is excellent for most mobile CB antenna

Check the SWR on Channel 1 and Channel 40
If the SWR is higher on 1, make the antenna longer
If the SWR is higher on 40, make the antenna shorter
Most antenna's are adjustable. Make small adjustments at a time.

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I want to know about the range with handheld cb radios

It depends on lots of factors....

First, the output power of your radio. Many claim 5watts output, but when measured on an accurate SWR / power meter, they are usually closer to 4 watts. Also, they usually output full power only with external power supply, not internal batteries.

Second, the antenna. If you are using a "rubber duck" helical, range will be at its minimum. If it has a quarter (1/4) wave telescopic whip (about 2 meters!) then that would be better.
If it has a socket for external antennas, then a (1/4) quarter wave car mag mount on something metal and 1/4 wave in radius this would be pretty good, especially if mounted above any local restrictions like buildings and walls.
The ultimate would be a half 1/2 wave antenna, mounted at least 1/2 wave (5 meters!) above ground, on a scaffoling pole or similar at least 1/2 wave long (5 meters).

The station you are speaking to also has a lot to do with range, if they have a good station, then range will be better.

With 5 watts, at the right time of day, with the right antenna, and under the right conditions, CB can reach across the globe! Yes really.

You need to post more info on the type of set up you have.

Hope this helps

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1 Answer

Swr to low?

The lower the SWR the better!

SWR is actually a ratio, e.g. 5:1, but generally speaking only the first number (5 in this case) is written as the second is always a 1. The lowest SWR you can get is 1 (1:1). So if you've got 1.5, that is very good.

Hope this helps,


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