Modifications for the Standard C-520
| 19-07-1998 | Expanding range of standard C520/C528 English language |
| 19-07-1998 | Cloning C520,C528 over the air English language |
| 19-07-1998 | Setting band edges on VHF/UHF RX/TX English language |
| 19-07-1998 | Extra functions for the Standard C520/528 English language |
| 19-07-1998 | Extra memory functions, 40 memory channels OR separate TX/RX Freq English language |
| 19-07-1998 | Quick Chart English language |
| 19-07-1998 | Upgrade C520/C528 to using rechargable batteries English language |
19-07-1998 Expanding range of standard
C520/C528
If you have got a Standard C520 or C528 but dont have the other bands then just follow the
insruction that are to follow.
What you get after modification:
VHF 124.00-176.50Mhz RX/TX
~~~ 327.00-399.99Mhz RX
UHF 400.00-471.00Mhz RX/TX
~~~ 820.00-899.99Mhz RX
900.00-979.99Mhz RX
19-07-1998 Cloning C520,C528 over the air
This function is only enabled if the master C520,C528 has been expanded for RX or TX.
19-07-1998 Setting band edges on VHF/UHF
RX/TX
Press and hold function button. Press 0,0 the display will change and show F and four
numbers.
First two set the lower frequency larst two upper frequency.
Two change the lower and upper frequency key in 2764 the display will change to the lowest
frequency .ie 127 Mhz and upper 164Mhz.
19-07-1998 Extra functions for the Standard
C520/528
Additional functions whilst in "SET MODE"
While holding the [FUNC] button press the [0/SET SB] button to enter set mode. (See
Section 15 in manual).
Whilst still in set mode the following btttons can be pressed, together with the [FUNC]
button, to provide the these functions
BUTTON FUNCTION
[DWN/* PS] Enter cloning mode. Transfers all memory data between
2 x C520/528`s. Tune both radios to the same frequency on one
of the bands. Enter cloning mode on both radios. Press PTT on
hhe radio that contains the memory data, A series of DTMF
tone will be heard for approx 2 minutes. The receiving radio`s
memories will now be identical to the transmitting radio.
19-07-1998 Extra memory functions, 40 memory
channels OR separate TX/RX Freq
Although the standard manual states that 20 memories are available split between VHF and
UHF bands, in fact there are 2 memory channels for each memory number on the VHF and UHF
bands. These can be used in 2 ways. One way is to double the number of simplex channels
availible, another is to provide programable RX and TX frequencies for each memory number.
Programming separate RX & TX frequencies in one memory location
"+-" Will appear in the repeater shift display to indicate that the memory
channel is now in split frequency mode. Once a memory location has been put into split
frequency mode it cannot be changed back to a simplex memory unless it is programmed as an
extra channel (see below) or a RESET is carried out.
Pressing [FUNC] and [9/REV] will cause the RX and TX frequencies to be swapped.
Programming extra memory channels, extends to 40 memories.
Program the first 10 memories on each band as per the manual. To program the additional 10
memories on each band follow the instructions below.
To recall these extra memories. Either use the rotary tunning control in memory mode,
which will now cycle through all programmed memories. Or enter memory mode and press
[FUNC] and [A/CL] together and the bar will appear above "M" indicator as when
it was programmed, pressing buttons 0 to 9 will then recall the extended channels.
The extended memory channels can have repeater shifts and CTCSS tones programmed in to
them in the normal way BUT the value of the repeater ofset and the frequency of the CTCSS
tone will be the same for both of the channels stored in one memory location. i.e memory 1
and -1 will both have the same repeater ofset but if the ofset is not activated on channel
-1 then it can be used as a simplex channel.
19-07-1998 Quick Chart
+---------------------------------------------------------------------------+ ? Standard C520/528 - Keypad Guide ? ?--+---------+--------------------+--------------------+-------------------? �Key? Alone ? With "FUNC" key ? Key alone in set �In Set With "F" ? ?--+---------+--------------------+--------------------+-------------------? ?0 ? 0 �Enter Set Mode �Mute keypad bleep �Set Band Edge Limit? ?1 ? 1 �Disable Transmitter ?/5 beeps when paged�Tx wait on c-b rept? ?2 ? 2 �Dual Watch Operation?kHz entry on keypad�CTCSS Scan Stop ? ?3 ? 3 �Select Output Power �Tx Delay on repeater�Switch UHF Bands ? ?4 ? 4 �Frequency Lock �Mute during squelch ?/3 digit direct fr? ?5 ? 5 �Battery Saver Mode �Automatic powr off �Pager Audio Mute ? ?6 ? 6 �Select Step Size �Enable tune in lock �Fast tune 1MHz/100k? ?7 ? 7 �CTCSS select TX/RX �CTCSS tone frequency�Single/Dual tone MF? ?8 ? 8 �Repeater Shift +/- �Set Tx/Rx split freq�Cross Band Repeater? ?9 ? 9 �Reverse Split �Make LAMP button REV�Up/Dn keys do 10MHz? ?* �Step Down�Search 1MHz band ? ? ? ?# �Step Up �Memory Shift ? ? ? ?A �Cancel ? ? ? ? ?B �Pager On �Set Pager Codes ? ? ? ?C �Mem Scan �Partial Memory Scan ? ? ? ?D �Dial/Mem �Store Dial In Memory? �Extend RX coverage ? �VHF�Tx VHF �Enable VHF Only ? ? ? �UHF�Tx UHF �Enable UHF Only ? ? ? +---+---------+--------------------+--------------------+-------------------+ ?To expand Rx coverage only ? +---------------------------------------------------------------------------+ ?VHF F+0 F+D ? +---------------------------------------------------------------------------+ ?To add 320-400,400-480,820-900,900-980 ? +---------------------------------------------------------------------------+ ?UHF F+L F+0 F+B F+L F+3 A ? +---------------------------------------------------------------------------+ ?To Expand Tx and Rx coverage: ? +---------------------------------------------------------------------------+ ?VHF F+0 F+D A ; Extends RX coverage ? ?UHF F+L F+0 F+B F+L F+3 A ; Gives 300/800/900MHz ? ?VHF F+6 step to 12.5MHz A ; This appears to set a special condition ? ?F+8 F+8 F+C ; within the unit which is stored with F+C. ? ?tune down to 144.9875 ; All params must be correct for it to work ? ?F+0 F+D PTT F+8 F+C ; And Store it ? +---------------------------------------------------------------------------+ ?To store independent transmit and receive frequency in one memory channel ? +---------------------------------------------------------------------------+ ?Enter receive frequency into dial ? ?F+D? ?Enter transmit frequency into dial ? ?F+D F+A F+ A ? +---------------------------------------------------------------------------+ ?To remove independent transmit frequency from memory ? +---------------------------------------------------------------------------+ ?F+D F+A +A F+A A ? +---------------------------------------------------------------------------+ ?To clone one set to another ? +---------------------------------------------------------------------------+ ?B B F+0 F+PS on both sets, and PTT on the one to clone from ? +---------------------------------------------------------------------------+
19-07-1998 Upgrade C520/C528 to using
rechargable batteries
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 600700 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
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, do 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 absolutely sure that there exists no kind of electrical contact from
the 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...