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Tune, alighn,A Galaxy959ssb, C.B.RADIO.

Internal adjustments to increase power output.

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Joseph Massimino

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You should know better than to ask this in a public forum. It is ******* to increase the power on a CB radio. Try searching Google for that.

Posted on Oct 23, 2019


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How do I increase power output for a cobra 148 gtl the latest Chinese version

best way is to leave the radio in piece and obtain a linear amplifier to do the job a 10 meter ham radio amplifier will do nicely but you must re-tune it for the 27 mhz band 10 meter band is 28 mhz.
RF amps work best using side-band mode.

Oct 14, 2013 | Cobra 148 GTL 120-Channels Base CB Radio

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How do you tune cb radio 75wx st

Not sure what you mean by tune.

If you mean peak and tune, where in you increase the internal power output of the radio, then the quick and dirty way of doing it is, turn VR4 all the way to the left and take the tank slug out of L14. HOWEVER, I prefer to use a watt meter on avg power to adjust L14 to peak, and no more as not to over bias the final. But typically nothing will happen if you do. This will give you full modulation, and full carrier.

If by tune you mean, Tuning the SWR. Then that is a whole different topic.

In this case you don't actually tune the radio. You tune the antenna. If the antenna is not the correct length, relative to the wave length, Frequency of transmission..... then you will have a high SWR and this means more of your RF energy is not leaving the antenna, and going back into the radio. This is bad. this kills radios.

So to tune it you must make the antenna the right length. Here is how to check SWR.

Tune the radio to ch 20. Put the rf/SWR/CAL switch to CAL.
Turn the CAL knob all the way to the left.
Key the radio, and turn the CAL knob to the right until the needle of the meter is at the CAL mark, on the top line of the meter indicated by a little upside down triangle. That is the cal mark. The needle should be on it.
Flip the RF/SWR/CAL switch to SWR while holding the key down.

The meter is now showing your SWR. If it is under 2 you are not real good, but not gonna kill the radio. If you are 1.5 or less you are good to go. Ideally you want to be 1.5 or less if you can.

If it is over 2 you should try to get it lower.

here is how to find out if the antenna is too long or too short.

Turn to ch 1, repeat the steps to check SWR. Then do the same thing on ch 40. Compare the reading. If the reading is higher on 1 then on 40 the antenna is too short, and you need to make it longer. If it is higher on 40 then 1, it is too long and you need to make it shorter.

All antennas have a way of adjusting the length.

Hope this helps.

Aug 10, 2012 | Radio Communications

1 Answer


Hi Ralph, what do you mean "turn up the receive" ? You can not increase the wattage output without changing internal components. To increase RF gain and max performance you can upgrade your antenna and tune the SWR to 1:1 to 1. Other than that, a power microphone & bi-linear amplifier are the only ways to make it more powerful.

Dec 22, 2011 | Cobra Radio Communications

1 Answer

What adjustible screw component on the cb circuit board do i need to "modulate" in order to increase the output of my cb radio. there are several little adjustable screws that increase or decrease my...

there is a modulation transformer inside it is the smaller of the two. there is a variable resister next to it . that is the variable you need to adjust to get the modulation to 95%.

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1 Answer

I need to set the clock on a CD/cassette radio in a 1999 Ford E 450...also how do I set preset stations too?

Station Pre Set:
You can save 4 pre sets on this radio (1-4) tune the radio to the station you want to save then PUSH and HOLD one of the pre set butons until the sound returns, the station is saved to that pre set. Repeat for the 3 presets.

Hour: Push and hold the CLK button and at the same time push the SEEK button to adjust. < decrease hours > increase hours.
Minute: Push and hold the CLK button and at the same time push the TUNE button the adjust. < decrease minutes > increase minutes.

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1 Answer

It dosen't have any power. It won't get out or receive with it.

Take it to a cb shop or a radio tech and pay them to peak and tune it.

It will increase the output from 4 watts, to close to 20 watts.

Mar 31, 2010 | Radio Communications

2 Answers

Low transmit audio cobra 29 ltd nw

Are you talking about this radio or what others are hearing from your radio?

My friend, no one but the holder of a 1st class FCC radio license is permitted to adjust the input power to the final amp. Further, one needs some pretty technical equipment to accomplish this fine tune adjustment. Failure to properly set this envelope will result in degraded operation and possible failure of your radio.

If you can't live with the present circumstance, get your radio profesionally repaired.

Thank you for your quesiton at

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Bearly 2 watts

What brand of watt metter are you using?
Most all of them can be adjusted inside.
I have seen a 4 watt radio key 9 watts on some
meters.I have a two-way shop for over 25 years
mostly VHF an UHF but I cut my teath on CB.
Maybe this will help

Jun 28, 2009 | Uniden Bearcat Pro PC68XL 40-Channels Base...

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Radio shack trc-447

According to the service manual for the TRC-447, the only adjustment is for "power" which is #L205. The only other step in the transmitter alignment is for the "S" meter.
On the Cobra, VR4 is AMC, L14,L13,L12 is AM power.

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Modification of frequency output of uniden pro 510xl

deweyp, hi, if you are wanting to turn the power up some on the radio, do this; tune L4, L5, L6, L9 for
maximum RF forward output. There are 2 versions of the radio, and both are listed as 510xl. If you are wanting to expand the freq's or add channels, then no, there is no mod for that radio. If your going to tune the radio for more power, make sure you have a power meter to watch the output. It is preferable to tune into a dummy load so your not broadcasting over the air. You tune the radio for peak output, using a steady awwww sound in to the mic. Just be careful as that radio has a fairly small driver and final transistor. Don't want to let the factory smoke out of it,,,
Here is what the little variable adjustments are for and what they control;
VR1 Squelch
VR2 TX Meter
VR3 RX Meter
VR4 RX IF Gain
Hope this helps you out, let us know,, Mechanic

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