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YEASU FT2800M HEAD SEPARATON
WARNING
DO THIS AT YOUR OWN RISK
You are dealing with connections that were meant to
be mounted on a circuit board, NOT directly to wires.
1. Remove the 3 allen screws from the front of the unit. I used a 3/32 wrench
because I was too lazy to go find my metric set.
2. Pull straight out on the front of the head till it starts to separate. Very slight up
and down wiggle may be needed.
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3. Pull straight so not to damage the pins that protrude from the head unit.
Main Radio
Head Unit
Head Pins
4. Close up view of the head pins and main radio connections. Note the ground
strap on the head unit.
Uses 2mm spacing between pin centers
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5. You will need from Yaesu the following connectors:
S8101428
6. You will also need a 24 conductor cable with a shield and ground wire. I used an
old parallel printer cable I had. It contains 25 conductors stranded, with a ground
wire and a shield. Separate the ends into 2 bundles of 12 wires each. Make triple
sure with an Ohm meter that you have the correct wires in each group.
Shield
Ground Wire
S8101429
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7. Using the header pin connectors, (S8101429) I found it was easier, and safer to
remove the pins from the connectors by applying a bit of heat and pulling the pins
out then soldering the wires to the pins. It is way to easy to OVER HEAT the
pins and melt the connector. After reassembly, Use some 5 minute epoxy to hold
the pins in place. This also helps to strengthen the connection and insure they are
insulated from each other. I wrapped each bundle in aluminum foil and tightly
wrapped with electrical tape. The foil insures that the GROUNDED Shield goes
all the way to the end.
Note the red and yellow markings to tell the
two connectors apart.
8. Using your ohm meter find the corresponding wire for the female connectors
(S810428)
WARNING, you are about to solder wires to connections that are only 2mm apart. Great
care must be used to insure that you do not have a solder bridge. Triple check with an
ohm meter that you are connecting the proper wire to the proper pin.
(S82101428) (S810429) (S82101428) (S810429)
Pin 1 O O Pin 1 Pin 1 O O Pin 1
Pin 2 O O Pin 2 Pin 2 O O Pin 2
Pin 3 O O Pin 3 Pin 3 O O Pin 3
Pin 4 O O Pin 4 Pin 4 O O Pin 4
Pin 12 O O Pin 12 Pin 12 O O Pin 12
CORRECT X
9. Ground wire.
FAILURE TO GROUND THE HEAD TO THE BASE WILL RESULT IN THE
SQUELCH AND VOLUME NOT FUNCTIONING
RADIO HEAD
WORNG X
GROUND TAB
Notice the electrical tape
pad I added
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Head mounted in my vehicle.
The head has foam rubber underneath it and is
mounted with Velcro. The wire harness secured
with some tie wraps not shown.
Base mounted in trunk area, NOTE I removed the foam packing. There are 2 large tie
wraps holding the radio in place and 3 more smaller ones securing the wire harness. I
attached the ground wire between the speaker plate and the frame.
Time will tell how well this will hold up. I do not have the funds to go out and buy a rig
that is meant to be separated. So far audio reports have been great. You will also need to
use an external speaker unless you mount the unit under your seat or something.
The only problem I have noticed is a slight click from the speaker when switching
frequencies. I actually kind of like it. I also added a large rubber band under the VFO
knob to tighten it up so it is not easily moved if I am going for the window switches.
Take your time, this was a tedious MOD due to the closeness of the connections you are
trying to solder. I triple checked all mine before bench testing.
Bob Waterfield
KD8HZC
http://www.melvinweather.com
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