A control head needs to be constructed.
personalize your conversion to suit your needs.
The frequency, CTCSS and channels are entered via the keypad.
The volume is set in the normal manner and the
squelch - since it is most often fixed, can be left at the
radio itself by installing a trimmer potentiometer. However, a control head
be provided as well, if the user desires one.
Building the Control Head
Here's one suggestion.
Get the larger Radio Shack plastic
(270-1806), one whose
rear side is large enough to hold the 3.5 x 4inch P/C board.
Solder pins to the 25 leads in a Male DB-25 connector
Use stiff pieces of wire, leads from larger resistors, pins
wire wrap sockets, or spare pins from the pin headers purchased for your P/C board connections.
the rear section, make an opening for a DB-25
connector. The plastic box is already slightly scored
connector will mount. Use an X-acto knife to make
it in place.
Once mounted, make the shield
and ground connections with 30 gauge wiring.
On the front, make an opening
for the LCD
, allowing room
for the optional bezel
Glue the bezel in
place. Drill the holes for and mount the keypad,
optional squelch) control(s), the mike jack.
Make an opening for the optional CTCSS detect LED if using the MX-465P chip (legacy arrangement).
Hot glue the keypad
If you have room for a speaker
it over to one side after
you drill the
holes to let the sound out
If there's no room, mount a jack
on the rear.
the LCD, connect 4 flat headed screws w/ nuts to the LCD
move it so that the LCD shows cleanly through
the opening. Mark the positions of the screws, putting a dab
epoxy or 'crazy glue' in each of the spots. Then, again place the LCD into
position and give the epoxy some time to harden.
remove the nuts holding the LCD in place - without disturbing
the epoxy joints. You may
go back and liberally coat the flat head mounting screws where they
meet the plastic to ensure a really good bond. Let
the adhesive cure before proceding.
Drill mounting holes in your enclosure
for the P/C
(control) board, and
mount it on the rear of the
. Two screws are needed to secure
it to the rear panel. Use the existing hole for the 5 VDC
regulator, and use the hole drilled in the opposite corner.
Secure the board to the rear panel with screws and
Wire it to the DB-25 connector.
Make all connections except for the 13 VDC power lead. Make
'end-to-end' (radio to
control head) check.
Wire up the LCD to the control
using enough 30 gauge wire to ensure that
the back of the control
head can be removed with the LCD in place. Once
you're certain that everything is connected properly, you may
apply power and
verify the proper operation of the LCD.
Once done, remove the
power. Make the final connections to the
keypad, mike jacks, the volume / squelch controls, the ON/OFF switch
(rear of the volume control) and to the (optional) CTCSS Detect LED.
Secure everything together neatly so that all of the leads
to the control board / DB-25 connector run in the same bundle.
Then, power it up and verify that it works properly.
Before closing the case, make the CTCSS adjustment (R11) with
your radio. Once this is done, secure the 4 screws holding the back of
the control head
and mount it in your chosen location as you see fit.
Click here for more information.
- - If you follow the
steps outlined herein, you do so at your own risk.
I cannot, nor will not, be responsible for any possible damage to radio
equipment, personal property, to yourself or to others caused by
modifications that you may make to the radio as a result of your
G.E.and the product names Phoenix, Delta, Rangr are
Ericsson General Electric Mobile Communications.
The M/P controls TRANSMITTING and receiving
on many frequencies, suitable for a wide range of HF, VHF and UHF
needs. In the USA, TRANSMIT operation requires a license
issued by the FCC for the class of operation
intended. Amateur radio licensees must maintain strict
control over their equipment, preventing unlicensed
operation within or outside
of the amateur bands.
Copyright 2010 - K3JLS