Author: PE-1MXV - Peter de Blecourt - pe1mxv@ardfnl.demon.nl.MODIFICATION.NET
Look in schematic plan for location of diodes D3, D4, D5, D6, D7.
They are located at printed circuit in rightcorner behind frontpanel.
| D3 | D4 | D5 | D6 | D7 | Omschrijving |
|---|
| 0 | 1 | 1 | 1 | 1 | European version |
| | | | | | |
| x | x | x | x | 0 | Step 5kHz / 10 kHz (FM) |
| x | x | x | x | 1 | Step 12.5kHz / 5 kHz (FM) |
| | | | | | |
| x | x | 0 | 0 | x | Tone button : Call Channel.
Funct and Voice buttons : select CTCSS |
| x | x | 0 | 1 | x | Toon button : When PTT pressed 1,5s 1750 Hz tone (UK version).
Funct and Voice buttons : no funktion. |
| x | x | 1 | 0 | x | Tone button : Call Channel.
Funct and Voice buttons : select CTCSS |
| x | x | 1 | 1 | x | Toon button : When pressed 1750 Hz tone. TX transmitting !!!
Funct and Voice buttons : no funktion. |
| 0 | 0 | x | x | x | Rx / Tx 144 - 146 MHz |
| 0 | 1 | x | x | x | Rx / Tx 144 - 146 MHz |
| 1 | 0 | x | x | x | Rx / Tx 144 - 148 MHz |
| 1 | 1 | x | x | x | Rx / Tx 142 - 149 MHz |
| | | | | | |
| 0 | 0 | 0 | 0 | 1 | TR-751 met CTCSS
Step 12.5kHz / 5 kHz (FM)
Tone button : call channel.
Funct and Voice buttons : select CTCSS
Rx / Tx 144 - 146 MHz |
| | | | | | |
| | | | | 0 | No diode present |
| | | | | 1 | Diode present |
|
