This is the exact info I was after on the ICOM's. Why is this not on the repeater builder website?
--- In [email protected], "edctexas" <[EMAIL PROTECTED]> wrote: > > --- In [email protected], "kg4wmp" <[EMAIL PROTECTED]> wrote: > > > > I could find nothing > > specific on why a radio whould need 4 (or more) 5C's and 1 EC. Do > > they take an average over several crystals or something or was this > > a function of multiple channels? > > > Normally a mobile set only needs one 5C or 2C ICOM. The EC units are > slaved to the correction that the 5C creates for itself. The radio > could have the buss cut and use separate Master and slaves for TX and > RX. It is not normally recommended to use multiple 5C units. This > will cause the units to fight each other. Theeir temp. comp. will > not be correct. But on low band and for ham use, put in what you got > and use it. Some of the MII repeaters in this area don't bother with > any temp. comp. at all. > > The master ICOM has a selected thermistor and resistor combination > which produces a correction voltage to a tuning diode (varicap). If > I remember right the 2C units have to have the parts selected, but > the 5C units don't. The EC units have the tuning diode and get the > correction voltage from the master. If two masters are tied together > the voltages fight. > > Some guys use EC ICOMs and modulate the varicap. Its good FM but > generally low deviation. Most repeaters source their +10V from a > separate source for TX and RX. This separation prevents any RX side > noise from adding spurious to the TX. Simplex transmitters don't have > the problem as the RX is off during TX. Repeaters do have the > problem without this extra separation. > > More GE trivia! WE can take this off line if you'd like more poop. R- > B website that Kevin has is a great source book. Once you get a > manual your off. Many mobile use the same key. I'm not sure if the > station key or the mobile key is stamped BF-10 anymore. Nearly any > 2way shop has a ley to unlock it. I'd just use the master key > (electirc drill). Then vaccuum the mess out of the radio. > > 73 Ed K3SWJ Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
