- Sep 2, 2020
So if a person gets a 100 watt amplifier, does the CB need to to dead key below 4 watts (be tuned down)? A lot of confusing info on the web. And you believe these things are shhhh .... illegal?
All amps are different. For me, I try to dead key are 2 watts, unless the amp is specifically designed for high input.So if a person gets a 100 watt amplifier, does the CB need to to dead key below 4 watts (be tuned down)? A lot of confusing info on the web. And you believe these things are shhhh .... illegal?
You kinda have to map out an amplifier with your radio using a peak reading wattmeter or oscilloscope and an average reading wattmeter will not tell you what you need to know. Take for example a perfectly working, stock, non modified radio should put out close to 4 watts dead key no modulation. At 100% modulation, if it will reach that, the radio will be putting out 12 watts peak. This is normal and every radio should do this, otherwise its not working properly. With AM modulation, the sidebands will add 6dB of power at 100% modulation, or an increase of 4X the power.
Now take an amplifier that's rated at 100 watts, that's all it will do no matter what you drive it with and its saturated at 100 watts. If your 4 watt radio runs it up to 100 watts or 90 watts or somewhere close to its maximum power with a dead carrier its not going to work properly when you add modulation. If the amp dead keys at 100 watts with no modulation, it will need to put out 400 watts peak when the radio is fully modulated, otherwise you get a bunch of distortion and only a fraction of the range increase that you would have if its working properly.
In this case where you have an amp that does 100 watts max and its saturated, then you would want to adjust your radio to produce about 25 watts dead carrier when the amp is on so that it will reach 100 watts under full modulation, getting the full 6dB increase when modulation is applied. I would say 90% of all amps used on CB are not used properly and dead key near full power and when you modulate it has nowhere to go but down (the toilet).
If you just want to jam people out and never talk, then by all means adjust your radio so the amp puts out full power with a dead carrier. You will cover up more people that way. If you actually want to talk you will talk further reducing your drive level so the amp will achieve that 4X increase in power when talking.
Don't be one of the dummies that doesn't know how to drive an amplifier and pick one that is appropriate for your radio and drive it with the right level. In the end you will be running much less dead carrier power than you think is right, but when you get that 4X peak power increase fully modulated the end result is the radio will sound identical with the amp on or off but the power and range will be much better with the amp on. Listen carefully to most amps out there being used wrong and when the amp goes on, the radio sounds different, it lost a lot of punch and clarity, gained a bunch of flat topping and distortion and some people think that sounds ok, but its not. Its pure trash because its owner is clueless.
thinking of getting the rm italy 203-p but have a new President radio that cant be adjustedAll amps are different. For me, I try to dead key are 2 watts, unless the amp is specifically designed for high input.
Better too low than too high. Even an amp designed for 4 watts, it would last longer if you pushed 2...
What amp do you have?
I know RM Italy makes some high drive amps, but I'm not sure about the 203. The 503 definitely comes in high drive, which I believe takes 35w input.thinking of getting the rm italy 203-p but have a new President radio that cant be adjusted
Which President radio? I have a brand new McKinley and it has adjustable RF power. Running it at 2w into a KL203. Amp on deadkeys at 25w and PEP’s to 125w on AM.Input power - 1 - 6 W for the 503
Input power 1 - 5 W Max for 203
so 4 watts should be ok ... but everyone on the net is stating 1 to 2 watts input or boooom after a while. and again, i have a cb radio that cannot be adjusted, a newer president radio.
Ya..you can adjust power off the function key. If I remember you key up press and function key and your RF power meter will starting blinking. Turn the channel adjust to where you want it and then long press the channel adjuster until it stops blinking.I have a McKinley and a Andy. So if I adjust the RF on the McKinley screen itll take down the wattage? Without opening it? Im so new.
You should really do more research. Reliability is not a strong suit. TX Star just another cheap amplifier, and maybe not “better”.Bamminjammin, in my honest opinion i would suggest getting a texas star amp rather then the rm Italy boxes. I would look for an older texas star that has toshiba transistors in it. They are a much better transistor and can take way more abuse than the rm Italy boxes. If your only looking to achieve a few hundred watts of peak.power a texas star 350 would be perfect for you.