information on this
proceeding pages is intended for
educational purpose's only. So if
you must use this information do
YOUR OWN RISK!!
- Remove the case and find the small circuit board
(EOT004410Z) connected to the left side of the radio
as viewed from the component side of the main
- Find the wire that is connected to this circuit
board remove this wire.
- Remove the small screw that holds the small board
on to the chassis.
Under this board you will find a 7 pin plug that is
not connected to anything. Insert this plug into the
empty socket on the small circuit board.
Replace screw back into the small board and close
Expanding the MB8719
(Models include: Uniden Grant/Madison, Cobra
148/2000 GTL etc...)
To get coverage from 27.455 - 28.045,
PLL, then locate pins 10,11and 12. Cut the trace
going to these pins. Locate a ground (chassis or
track) .Using a DPDT Center off switch, connect the
switch to pins 10,11,12(IC side of the cut) on the
MB8719 PLL.This Mod will give you the normal channels
1-40 in the center position. In the Down position
27.605 - 28.045, In the up position 27.455 - 27.605(
on channels 2 -14).
- Further expansion can be done by replacing the
mixer crystal, giving you a new set of 40 channels
- Remove the four screws holding the bottom cover
Lift the bottom cover enough to clear the case and
slide it to the side while being careful not to
detach the speaker wires.
You should now see the PLL/CPU board at the front of
- With the front of the radio facing you, locate
and R540 at the lower right corner of the large
chip(HD614081), R539/R540 are side by side and very
Remove R539 and R540. You now will get 26.500Mhz to
27.999Mhz plus the 'FCC' band in nine bands.
This PLL includes the following
For Export Models eg.
Mark 4A, Dak Mark V, Robyn 440, Dak Mark IX, Lake
600, Palomar SSB500 (late), Regency CB501, SBE 54CB,
This PLL is getting used in a lot
It often has a pair of MC14008 binary adders to
extend the amount of channels available.The PLL uses
9 bit binary programming with internal pull-down
Modifications are possible by changing the binary
programming... or changing
the mixing crystal.
- Cobra 148 GTL-DX see
Also these UNIDEN 'clones' use this chip...Connex
3300, Excalibur base, Excalibur Samurai, Galaxy
2100,Galaxy II, Galaxy Pluto, Galaxy Saturn,
Franklin, Superstar 3600, Superstar 3900, Super
Galaxy, Texas Star.
PLL 02A MODS
This chip can be found in many radios. This mod might
also work on the SSB units.
And just about anything with a PLL 02A chip in it.
The 23-channel radios will give different channels.
This will give you 27.425 to 27.705 Mhz on channels
12 - 38.
- Cut the Trace going to PIN #10.
- Solder a 3.3 K resistor across the cut.
- Solder 1 leg of a SPST switch to GROUND.
- Solder the other leg to PIN #10 before the
This will give you 26.435 to 26.7455 Mhz on channels
10 - 38 .
When the switch is DOWN.
This will give you 26.755 to 27.055 Mhz on channels
- 1)Cut the Traces going to PIN #10 and PIN #9.
- 2)Solder a 3.3 K resistor across the cuts.
- 3)Using a DPDT Center-Off type switch solder
from the PLL to the back of the switch as shown.
When the switch is UP.
Ranger RCI 2950
The only difference between the old and new versions
of the RCI2950 is the new CPU board. They require
slightly different modifications.
The old version of this radio can be expanded from 26
Mhz to 32 Mhz. Although the use of the 30 -32 Mhz
range may need realignment.
As the CPU board has changed the modification is
different. On the CPU board there is only one jumper
with two positions available. In one position it
covers 28 Mhz to 30 Mhz, In the other it covers 26
Mhz to 30 Mhz. But if you jump all three pins
together you'll get 26 Mhz to 30 Mhz.
- First find the PC board with the jumpers on
the front panel).Then find 'J2',there is a jumper on
pins P3 and P4.If this is jumper is removed you will
get coverage from 26 Mhz to 29.7 Mhz.
- If this jumper is then place on P1 and P2
will be from 26 Mhz to 32 Mhz(re tuning may be needed
to operate in 30-32 Mhz range).
This radio can be expanded to cover 26-30 Mhz without
the need to realign!
- Find IC315(UC1201A,UC1170,UC1250a etc) on the
synthesizer board PB121BB.Then locate pins 34 and 35
on that chip, these pins are grounded on the HR2510.
But on the European models like the President Lincon
they are tied high(+5 Vdc).
Therefore to get the extended coverage needed these
pins should be tied high.This can be done in the
- On the solder side of the synth board pins 34 &
are grounded by the same trace. With a razor blade
cut this ground trace.
- Now find resistor pack RR301.The left pin of this
pack is unused and goes to a solder pad. Now connect
a small jumper wire between this solder pad and pins
34 & 35 on IC315.
Now you should get coverage from 26.000 Mhz to 29.990
To expand this radio to 400 channels, do the
- Remove the back cover.
Find the small circuit board that has the PTT and
On the reverse side of this PCB look for 3 solder
islands that end on the outside edge of the board.
- Solder a bridge across all three islands.
- Then do the following...
If the radio has been used before you will need to
remove the battery and with the power switch ON short
out the supply terminals for about a day. This will
cause the processor to clear it's self.
- Make sure the power switch is on hold down the
CH9 button and slide the battery pack back on. Now
should be able to hear the receiver but no display,
release the CH9 button and the display should
Now using the CH9 button you should be able to select
10 bands of 40 channels (A thru J). Now whenever you
power up the radio with the CH9 button held down
you'll get 400 channels..If you do not hold the CH9
button down you will get the standard 40 channels.
- To set radio foe 240 channel mode press and hold
and "9" then turn radio on.
- Select bands by using
- To set radio for 28Mhz to 29.7 Mhz press and hold
"LCR" and "eMIC"e then turn radio on. To switch back
to 40 channel mode repeat process.
Galaxy DX 2527
Remove the top cover. Just above the PLL you will
find a jumper block.
There is only one jumper on this block..Move the
jumper from bottom left position to top right
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Last update 11/21/99
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