Hi Bob, > [EMAIL PROTECTED] wrote: > Distortion is not the only issue in using speaker audio as repeat > audio. In many cases there is additional filtering in the speaker > audio chain that can degrade repeat audio.
I have not run into that being a problem.. in fact in an ideal world the speaker audio in many commercial radios should have the ctcss frequencies removed. The speaker audio should normally be de-emphasized and have the ctcss sub tones removed, which is great news when the transmit radio has its own internal ctcss encoder (for true "strip and re-insert" ctcss sub tone operation). > In the end it has a lot to do with how the radio was designed. An Amen from the crowd... > I once built a barebones system using a GE MVP with speaker > audio going straight into the mic input using only an 8 ohm > load resistor, coupling capacitor & resistive divider to get > the level right. It did sound quite good, but I suspect this > is more the exception than the norm. > Bob NO6B Shouldn't be... many people seem to get freaked out about the transmit radio audio input being at very low mic-level/values, which is not always the case. Some radios (Midland Syntech and XTR) have a much higher mic input value (their hand mics have a pretty decent internal preamplifier circuit) and work very primo with terminated speaker audio connections. Terminated speaker audio is a very viable option if you need to go that route. Picking level-setting part values, which result in running the volume control operated in the lower 1/3 of it's normal range often keep the audio amplifier distortion levels well under control. And... all of this is pretty easy to do using simple connections. The major trick is to keep "magic fingers" from adjusting the volume control(s) once you set it to a desired value. cheers, skipp > >In many/most cases the reported speaker output distortion is not > >anything to get excited about... it can be/is often quite usable > >and in many/most cases un-noticed by most repeater system users. > >In a basic repeater system terminated speaker audio remains a > >very viable option. >
