2510.1
the 1k resistor, r 802 will be replaced with a 100k resistor, and a line
will be taken from the 8v side of ic 107 the 8v regulator to a resistor
network that will give aproximately 52k (you will need to experiment to
get a value such that you rit pot will give you readout frequency when
the feducial line is pointed at center)
lift one side of diode d150, this will free the pot vr111 from the line
that feeds the varactor on the pll board. you may use the pot in conjunction
with a 50k resistor (47k) to set the rit pot to center position, by putting
it in series with the 50k resistor and adjusting. this combinations will
give aproximately +-300hz either side of readout freq.
the best way to use the pot vr111 for this is to lift a jumper that runs
to the land on the high side of the pot and solder the 50k resistor to this
land. run a wire from the other side of the resistor to +8v (make sure it
is not tx or rx 8v since that is switched on or off depending on what state
radio is in tx or rx)
 
having done these mods you will have a radio with a fast agc and a rtit control
that will give the narrow changes needed for packet. the radio will be quite
stable. now to see about putting a g3ruh modem on the varactor of the radio
hmmm anyone for 4800b or 9600b on 10m (you gringos get a sta and lets try
it, could be interesting!!)
CONTINUED IN FILE 2510.2