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Re: Motorola CP200, radio just beeps when im pressing any...
It is possible your radio is not programmed, or has a bad/old battery.
It is normal for the side buttons 1 and 2 to beep when depressed to indicate you turned the feature on/off. Each of these buttons has the ability to be programmed a long and a short press feature.
If your radio beeps when your press the PTT button, on any or all channels, it indicates a low or nearly dead battery. Check your battery date code to see if the battery needs replaced.
If your radio emits a long tone on a channel, that channel is not programmed to function.
If your radio beeps a single beep when you turn it on, this is normal.
Charge your radio completely overnight, with the radio turned off. See if this solves the problem. If not, try a new/different battery to see if it will solve the issue. If not, drop by your local dealer and let them look at the unit.
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Some hiss at high gain settings is normal. If you get objectionable hiss at 1 o'clock settings of gain, that is too high. Electronics has noise that is "statistical" in nature due to physics that we can't get around in design. Most hiss is created in the preamp area and swapping tubes in the first stage might help. By varying the volume controls and observing the level of the hiss, we may be able to analyze the offending staage of amplification. ALso turning up the treble controls will increase the hiss, as it is mostly in the higher pitches.
There is not enough info here to provide a complete answer, but let me give you some background:
There will always be some hiss. This is due to general amplification where a small amount of noise is amplified along with the general signal. In most cases, the signal is strong enough to overpower any noise that is present (vocals in your example). This noise should not be that noticable in normal cases. If there is an automatic gain control in the line, this could account for it as with "silent" times, the gain will automatically be increased potentially to the degree where the noise is noticable.
Barring that scenerio, if the input signal is too low, the overall gain necessary to produce reasonable volume at the speakers will also be such that the noise is noticable. In order to track this down, please provide details about the current setup including:
1) Microphone make and model being used
2) Input being used on the mixer
3) Gain level being used for the mic channel
4) Gain level being used at the master level.
If you are having the treble/high turned up there will be hiss. This is due to the statistical noise in electronics, including semiconductors. It is a matter of degree. The hiss should be 30 Db below your program level or so.
It is very common for one to change settings and suddenly start to notice hiss or hum at certain settings.
IF YOU CAN, go to a music store and COMPARE the amp to yours at the same setting with NOTHING plugged in. (cables and guitars can generate hiss or other noise themselves).
There is very little in your amp that would have changed to suddenly start generating hiss, so FIRST compare. This will minimize the chance of spending money at a shop to be told it is normal.
Hook a graphic equalizer between the piano and speakers, and turn down all sliders above 8 kHz. Since the highest note of a piano is 4186 Hz (4.186 kHz), you'll still hear all the notes but cut the hiss. If the hiss is coming from the speaker's power amplifier (in which case the equalizer won't help), turn down the speaker volume and turn up the piano volume. Live instruments generally need some doctoring to sound good through high-quality stereo equipment, as they only produce a limited range of frequencies whereas good speakers reproduce a lot more - including hiss.