I have a Ranger 6900F Jumbo
left to right,Volume,on/off(center) Squelch (outside)2nd knob is mic gain (center) this controls how much adio output you produce.. and rf gain,(outside) This adjust how sensitive the radio recieves.3rd knob is pa/fm/am This sets the radio up for using a public address horn if hooked up, or to transmit and recieve on am (most common) or fm.
The next knob controls what bands o channels you operate on .6 bands of channels with 40 channels each.The next knob controls the amount of echo and reverb you use when you talk.The center controls the echo and the outside controls the speed,or reverb effect.The next knob controls the talk back(so you hear what you sound like on the center control, and the outside controls how much power you put out.The next knob, the biggest one is your channel selector.The push buttons are top l to r are:1 is the dimmer switch for your lights,the middel top is noise blanker and automatic noise limiter. This blanks out a lot of static and outside electrical noise.the last top switch is a roger beep switch to turn it on and off. When it is on you will produce a quick beep when you unkey the mike. This was originally used to let the other people on the bands know you stopped talking.The bottom left shuts off the frequency counter(the numbered display ie27.185,the middle sets the meter to be used as an swr meter or a regular s/rf meter.the last on the bottom will boost the frequencet up100 kilohertz.if you go to the following url you can get more info:http://www.rangerusa.com/.
Hope this helps
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