My 4300hp will squeal when the rf gain is fully cloclwise, if i just move it back it stops what causes this

Try adjusting your RF gain control. This will often cause this to happen if it is fully on.

turn the rf gain down to 1/2 way and see if it still does it.

turn down the rf gain. If that doesn't work you may want to have some one install 2 .001 caps across the tx and the dx wires in the mic.

Have a look here for info about the Ranger 2950. This is an Amateur 10 & 12 meter transceiver that enjoy some popularity due to its ability to be modified to work on the 27Mhz Citizens Band.

Make sure the Mode is set to something other than PA. A few of the first things that come to mind is the Volume, Squelch & RF Gain settings. The Volume is straight forward - choose a setting in the middle to begin. Next, set the squelch. Most radios have the squelch open when set fully counter-clockwise. As you move the squelch to this position, sound should be heard from the speaker if a signal is present. As long as there is an antenna connected, the radio should "hear" noise. If you do not hear anything, leave the Squelch fully CCW and try varying the RF Gain fully in one direction. If you still hear nothing, set the Squelch to the fully clock-wise position. Adjust the RF Gain to the opposite direction. At this point, you should have heard something - even if just static hash. If not, the volume control may be dirty. Disconnect power and rotate the volume control back and forth several times to dislodge any dirt on the volume wiper inside the radio, and try again.

Make sure that the Ext Spk jack does not have a plug inserted as it will defeat the internal speaker. Likewise, if using an external speaker, make sure it works.

Good luck!

RF gain or volume turned up all the way?

turn rf gain up and the mic gain down until it stops squealing.

Do you have talkback installed? It my be too loud and causing feed back. Back the mic gain down if so.

Could also be improper mic wiring. If you use a mic that is wired for a different radio, it could just cause a hum, buzz or squeal.

Another thing that can cause a hum, buzz or squeal is a faulty volume and or squelch knob depending on the radio.

• Turn down or disable talk back.
• If you cannot turn off or disable talk back, lower mic gain.
• Try a different mic that you know is wired for cobra.
• Play with volume and squelch knobs while TX and see if it stops at all. If it does replace knob.
  

The mic could be no good.

The things that cause squeal are RF feed back, and or talk back that is too loud. If you have talk back, this is what is causing the feed back. If not, then it is most likely RF feedback. There could be something wrong with the coax, or antenna.

A major cause of this is called common mode current. This is when the rf travels back down the out side of the coax making the coax act like an antenna. It also is bad for the radio because it will change the electrical length of the antenna and will potentially raise the SWR and can damage the radio.

To stop common mode,as close the the antenna that you can, take 6 feet of the coax and make a tightly wound and uniform coil out of the coax, and use zip ties or electrical tape to keep it together.

This will stop the RF from traveling back down the outside of the coax, and in turn will stop the RF feed back if it is caused by common mode current.

Of course, it may just be a bad mic.

microphones are wired wrong

vol set to audio level you like.
squelch set fully counter clockwise
rf gain. set fully clockwise
rf power around the 8-10 oclock position. too much deadkey will give weak audio.

not sure what band it needs to be on.been awhile since playn with this model.

clarifier set 12 oclock setting.
talkback just to were it doesn't squeal or lower