SRA / Ericsson
Code-Plug
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Please don't ask for a copy of the  MAXICOM
program, and I will not give any support regarding
programming your C600.




Socket adapter for reading/burning the content of a Code plug with the S3 Prom programmer

 

 




Socket adapter for reading/burning the content of a Code plug with a Prom programmer

 

 




Programmer for BPROM

 

 




Code plug reader for SRA/Ericsson C600

 

 




TONTEQ 600
CCIR test unit for SRA/Ericsson C600

 

 




C600 MAXICOM rebuilt for an internal 2716 EPROM Codeplug

 

 




C600 MAXICOM rebuilt for an internal 2716 EPROM Codeplug
The prom socket is placed at side of the Backup battery
Note, you have to replace the original battery with a shorter one

 

 




C600 MAXICOM rebuilt for an internal 2716 EPROM Codeplug
Eprom socket

 

 


SRA / Ericsson C600
 
Replace the expensive and hard to find 27S13 BPROM with a reprogrammable 2716 EPROM.
Remove the bprom from the holder and attach a piece of Veroboard with a prom socket installed. Make the wire connections according to the diagram.

 




Wiring diagram for replacing the BPROM with a 2716/27C16 EPROM
The same pins are used for the internal prom socket

 

 





External EPROM adapter for Ericsson C600 for code plug testing
Can't be used in a rebuilt radio with an intenal prom socket

Code plug programmed with the MAXICOM software

 

 




Original Bprom code plug 

 

 




Reprogrammable code plug for C600
Original SRA/Ericsson

 

 




Reprogrammable code plug for C600
Home built

 

 




Programming adapter for reprogrammable code plug
Original SRA/Ericsson

 

 




Programming adapter for reprogrammable code plug
Home built

 

 




Product key for SRA/Ericsson C600

 

 




Logic unit simulator for SRA/Ericsson C600
DIP-switches for Division number and X-tal selection.
Volume control for audio.
With this simulator connected, the radio can be controlled
without any logic unit connected.

 

 




Logic unit simulator for SRA/Ericsson C600
DIP-switches for Division number and X-tal selection.
Volume control for audio.
With this simulator connected, the radio can be controlled
without any logic unit connected.

 

 




SRA/Ericsson C600 X-tal positions

 

 




Formula for calculating the working range for X-tals

Lowest RX-freq in MHz = (X-tal freq * factor) + IF + 1.25
Highest RX-freq in MHz = (X-tal freq * factor) + IF + 5.25

Lowest TX-freq in MHz = (X-tal freq * factor) + 1.25
Highest TX-freq in MHz = (X-tal freq * factor) + 5.25








Tuning the Frequency generator (in Swedish)
This operation is mandatory when changing X-tals.
The probe used, see below.

 

 




Probe for tuning the Frequency generator.
Hold the probe close to the X-tal oscillator coil,
and view the frequency on a frequency counter.

 

 




SRA/Ericsson C600 Transmitter
Tuning points

 

 




SRA/Ericsson C600 FMO-Transmitter
Tuning points

 

 




Tuning the Transmitter (in Swedish)


 

 




SRA/Ericsson C600 Receiver
Tuning testpoints and trimpot's

 

 




Tuning the Receiver (in Swedish)


 

 




Tuning the Receiver (in Swedish)


 

 






Programming Code card for F600

Code card RR-188649





********************************


Code card RR-185070






Formula for calculating division numbers for code cards F600 and C600 OPENCOM

D = fFG  -  fx        for 80 MHz
         0.025

D = fFG  - 2*fx      for 160 MHz
         0.025

D = fFG  -  6*fx      for 450 MHz
         0.025

fFG = freq. from the freq. generator
fx = freq. generator X-tal

The division number is converted to binary number, and  coded on
the code card. A diod represents an "1".

Example: Working freq. 79.0375 MHz and Tx X-tal 76.0375 / Rx X-tal 65.3375

Dtx = 79.0375 - 76.0375   = 120
                   0.025

Drx = 79.0375 + 10.7 - (65.3375 + 21.4)   = 120
                                 0.025

Dec 120 = Binary: 01111000



C600 OPENCOM


Code card



Reading a C600 Code plug with a 8 Bit Eprom burner





When transferring the 8-Bit code to the 4-Bit Maxicom HEX-editor, it looks like this.





Screen dumps from the SRA/Ericsson MAXICOM program
This program is used for making Code Plugs for the C600