Squell when i key up
Squealing sounds come from feedback. Many times is is from an adio source and speaker. Check your radio's switches and jacks to make sure that any external speaker set up in the passenger compartment of the car is connected to the "EXTERNAL SPEAKER" or "EXT SP" jack, and not into one labeled "PA". PA is for "Public Address". When the selector switch is set to "PA" instead of "CB" and the mic's Push To Talk (PTT) button is pressed, what ever sounds picked up by the mic are sent directly to the PA speaker, NOT transmitted on the CB channel. The sound is a high pitched squealing noise that is reduced or eliminated when the mic "gain" is reduced; speaker volume reduced; headphones are used or the distance between mic and speaker is increased.
The feedback can also be from "RF", or radio frequency energy. RF energy feedback is different from audio feedback in that the way to eliminate it is to properly tune or "match" the antenna to the frequency of the RF energy from the radio (in this case, about 4 watts on the low 27Mhz range). This is done by inserting an SWR meter between the transmitter's antenna connector and the antenna. Following the directions included with the meter and adjusting the physical length of the antenna's whip up or down in 1/8" increments will allow you to quickly find the lowest match possible over the range of CB frequencies.
Failure to obtain an acceptable match ratio can result in damage to the transmitter and RF burns to the operator. A match of 2:1 (two to one) is acceptable, but the lower you can get the better. Anything in the 1.5:1 (one point five to one) down to 1.1:1 (one point one to one) range is excellent - with 1.1:1 being ideal.
I hope this helps & good luck!
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