Northern California 900 Repeater System
Technical specs and other info on using the system
As you know by now, all 900 radios are designed for 2.5 KHz maximum deviation.  Motorola introduced something called "HEARCLEAR", or on some radios, it was called "COMPANDERING" or "ADAPTIVE SPLATTER CONTROL".  It was designed to expand the dynamic range of the narrow modulation, but most repeater operators do not like the sound of it and disable it.  Unfortunately, with it turned off, the mic gain on most Motorola radios is very low!  You have to "eat" the microphone and talk loud to get full deviation out of the radio!  If there were a way to enable the HEARCLEAR on TX and disable it on RX, it may sound OK as it simply sounds like a "speech processor", and some "quiet talking" people could use it!
The entire NC9RS system is set up for 3 KHz maximum deviation.  That's 2.5 KHz of audio and 500 Hz of PL tone.  This works well and has no distortion, so if you have access to a good service monitor, set your radio up for 3 KHz peak deviation with PL.

The NC9RS repeaters outside of the Sacramento repeater use a scanning receiver for the "dual" input frequencies and take an extra half of a second to lock on to your signal and bring up the rest of the system, so when on a repeater, be sure to give about a second after keying the mic for the entire system to come up before talking, otherwise, your first word will always get cut off.

If you have a 900 repeater or system and would be interested in linking it into the NC9RS system, our rules are simple.  No other bands on the system! (link freq's are the exception) Just 900.  We have nothing against the other bands or the people that use them, just trying to promote 900 only. If you are interested and your system has a good shot to the Sierra's East of Pollock Pines, CA, email me for the link frequency so you can listen for it and see if you can get into it easily.  It only requires a "Half Duplex" 420 radio to get to it.  Later on, there may be other "HUB's" available for access into the system, but for now, that is it.

We are now on Allstar, so if you want to link into it that way, there must be no detectable "tail" from the system on the other end.  The NC9RS end will have no tail, courtesy tones or ID's feeding back into Allstar either. 
The Allstar HUB for the 900 system is # 41170.  Please use this unless some special event is going on, like the 10GHz contest, and you need to connect directly to NC9RS.  In that case, use 29771.

Beeps Boops and Honks! Things have changed!
When using the system, wait for a tone, any tone, after someone is done transmitting before you key up!  Otherwise, this can cause a problem with the link and you won't be heard!  There are a couple of tones on the system, the "Local Tones" and the "Link Tones."  Local tones on ALL repeater are a "Boop-Beep."  Link Tones tell you if the link is up and where the person on the other end is coming from.  (Does NOT apply to repeaters in Bishop, Fresno, Sonora and Ridgecrest.  These will be converted later)

If the person you are talking to is on a different repeater than the one you are on, there is NO "boop beep", it will either be a single "Honk" or a high pitch "Beep-Boop."  The "Honk" tells you the other person is coming from Allstar and could be anywhere in the country!  The "Beep-Boop" signifies two things, the Allstar link is up and the other person is within the NC9RS system somewhere.

Normally, when you kerchink the machine, you will get a "Boop-Beep...Beep-BooP.  This means the Allstar is connected.  If you get a "Boop-Beep...Honk" this means Allstar is disconnected and only the NC9RS repeaters are connected together.