Question about Superstar SS-121 120-Channels Base CB Radio

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Circuit diagram super star 121 c222 - Superstar SS-121 120-Channels Base CB Radio

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How do i convert it to 11 meters

Posted on Mar 12, 2009

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Try going to cb

Posted on Mar 09, 2009

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1 Answer

Where can I get a circuit diagram for a Pearce Simpson Super Panther M4 CB?

Here you are:

Apr 24, 2015 | Radio Communications

1 Answer

How do I hook up a amp to a Superstar 121 cb radio

first if must be adjusted for deadkey to be lowered down from 1-4watts as not to hurt the amplifier, then connect a small jumper to the amp, run heavy gauge wires to a good power source hopefully the battery.. just use a relay to switch on/off w/key/stereo circuit to turn main power off the the amp. if need too. Also the SWR's must be low have them checked. Free @ any Good Radio Shop.

Mar 10, 2011 | Superstar SS-121 120-Channels Base CB...

1 Answer

Superstar 121 has only 50% mod. what needs to be cut to get 100% or more

Some people say cut off or jump the mod regulator on the circuit board. It would be better to get the specs on the circuit and using a small to screw driver (with power off) to turn it up counter clockwise all the way. It is factory set at 50 to 90% modulation. I would not turn it up all the way unless the radio has a mic power output adjustment on the panel. This way if you go "over mod" you can cut back the power. Many "S" meters will also show modulation so you can see if it is too high (into the red). Check for response to modulation before starting to see if it reads modulation. Afterwords to check, key the mic without making any sounds and see where the meter sits. Then whistle into the mic to see the meter moves up. If nothing happens it could be: 1) the "S" meter does not show modulation, or 2) you turned the adjustment in the wrong direction. If no one answers your calls it would be #2.

Feb 28, 2011 | Superstar SS-121 120-Channels Base CB...

1 Answer

How do i increase the power in my super star 121 radio?

To increase modulation you want to change R142 and R174 to 10 K Ohms. You
Modulation boost: Change R142 and R174 to 10k ohms.You can clip d80 for talkback. Now for the power, look in the radio towards the back. You see the pot with the ferrite in it right behind c144 - it might have some glue in it. Gently scrape that glue out of there with a plastic screwdriver. Now unscrew that ferrite clear out. Those will be your main adjustments you can do without a scope.

Jan 26, 2011 | Superstar Radio Communications

3 Answers

No talkback

Remove D80 to achieve talkback, or put on switch. -

Aug 11, 2010 | Superstar SS-121 120-Channels Base CB...

1 Answer

How do i get more mod out of superstar 121 cb

A super star will only put out around 28 to 30 watts, any more you need a linear, you could have you r swr checked to make sure your antenna is good, any good antenna should talk around 10 miles

Nov 22, 2009 | Superstar SS-121 120-Channels Base CB...

1 Answer

Superstar 121 with astatic power mic and texas star dx 500 power..when I key up to talk they say I sound like I'm a ways from the mic, but I have a loud roger beep...any ideas....mic?...

try a stock mike or a noise canceling one. Hard to run power on top of power. And see what your radio is dead keying into the radio...usally with a 500 it can take up to a 6 watt dead key.

Nov 10, 2009 | Superstar SS-121 120-Channels Base CB...

1 Answer

I want to know how to convert my superstar121

3 Bands (LOW - MID - HIGH) 25.515 - 27.855 MHz.

Export Frequency Conversion
1. Remove the top cover from the unit and locate the PLL chip (MC145106P). Unsolder the short jumper wire running from the +8.2vdc source to pin 9 of the PLL chip. 2. 2. Resolder the three pins of the PLL chip, Pins 10, 11, and 12, being carefull not to short them together. Note: The Super Star 140 Microphone wiring is the same as all Midland Radios.

Mar 12, 2009 | Superstar SS-121 120-Channels Base CB...

1 Answer

Old dynamike plus wiring for a super star 3900

Check the mike plug to make sure that none of the wires have broke off.I would also check the mike cable with an ohm meter.

Jan 02, 2009 | Cobra 148 GTL 120-Channels Base CB Radio

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