C528.1

From : GB7OMM @ GB7OMM.#34.GBR.EU
Hi All,
another mode from Elio IK4NYY.
I would like to thank him for the mod plus a very big Thanks to Steve's (G8SFR)
Xyl Alison for retypeing out the mod for me into English.
This has been sent mainly as a guide and that i can not be of any help if you
run into trouble, but i bet there are more tec minded people that  can help
you.

  De Steve G0OMM @ GB7OMM.#34.GBR.EU

With this  simple mod, you can  upgrade your  Standard C520/528 using 
rechargable batteries without having to spend a lot.
You will need to get 6 rechargeables of 600\700 mah, a resister of 33ohm 2 watt
and two diodes of 1 amp type 1N4004.
Start by taking off the outside cover.  To open the transceiver, you need to
remove the  small metal  plate where  you will  find the  battery pack  held in
place  by  4  little  screws,  the cross-headed screws mounted laterally on the
back.
It's all you have to do, the transceiver will open.
Carefully open the  two parts holding  together from the  flat cable upon which
half you should find the finger control/keyboard and a long wire approx 7 cms.
You can't miss it, it's the only wire there is.
Now, from the point where this is  soldered onto the lower, bottom part of  the
transceiver, solder a small piece of wire about 3 or 4cms.
The other end  should be soldered  to the PCB  where there is  a large/fat/wide
soldered  little  square  (PCB  Track?)  which also cannot be missed tacking as
orientation  the connector  from the  external power  supply: The  said  little
square stands on its own and with  this the mod on the inside of  the apparatus
are complete and can now recharge them

Part 2...
Now let us look at the Battery pack (Model CBT 151).
Open  the two  parts and  take out  only that  one where  you see  the  sign  +
(positive).
Note  where the  first battery  is, Its  Positive pole  resting on  the  little
metallic  tab(  tongue)  having  the  shape and the characteristics of a corner
angle slipped off from its housing towards the top.
Do not worry, it is only fixed in and divides with cutters in the middle of the
corner/angle.
Be Careful when  separating with the  cutters, The two  parts may tend  to fall
apart, Thus, If you are not careful you can lose a piece.
If this happens, o not worry , but be very careful that this does not happen.
Take the smallest piece, Namely that which is mounteed next to the + symbol and
solder on top  of the terminals  the two diodes  in series opposite in between,
Namely an anode and a cathode.
Mind that the  pieces of the  terminals are chromed  metal ie on the point when
you intend to solder the join, It is  necessary you clean in a bit first with a
thin sanding paper,  Solder it and  try to slide  it away; you can also help by
using some soldering flux such as a deoxydising one.
Do this soldering, solder the diodes  to the very edges of the  resister (divie
the leads furthest most extreme side k cathode diod-resistance).




Now remount the first piece on  the capaciter moulded sockets of resistor of 33
ohms and diodes so that they can  be fixed in the restricted space at  the side
of the first battery.
Also replace the other piece of the  metal tab onto place and solder it  on top
of the terminal along the resister (on  to which is attached :- A anode  of the
diode.
That is Basically it.
One last  thing,Make absdolutely  sure that  there exists no kind of electrical
contact from the two two metal tabs from your solders.
Mount on the battery carriers  the six rechargeable batteries, check  again the
whole thing and  connect on the  switch of the  external feeder/power supply  a
voltage of 10 to 12 volts and let the batteries charge up.
The  apparatus can  then work  on batteries  and with  the power  supply;  When
working with the latter, The batteries will just charge up, In spite of all the
? modification...


END......