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== Improved CTCSS tone filtering ==
== Improved CTCSS tone filtering ==
Replaces 330kohm resistor and 100nF cap:


>--- 22kohm ---+--- 22kohm ---+--- 330kohm ----- 15 nF ----> output
  >--- 22kohm ---+--- 22kohm ---+--- 330kohm ----- 15 nF ----> output
              |              |         
                  |              |         
              === 15nF      === 15nF
                === 15nF      === 15nF
              |              |
                  |              |
              |              |
                  |              |
              GND            GND  
                GND            GND  


Capasitors can be between 10...20 nF, resistors 18...27 kohm.
Capasitors can be between 10...20 nF, resistors 18...27 kohm.

Versio 2. syyskuuta 2008 kello 09.30

Nokia Mobira R58 and subversions RB58, RC58 and RD58

This page is intended to be a collection of modifications for R58 series radio, to be used for both operating radios and R58's used as repeaters, duplex gateways etc.


CTCSS generation/encoding for non-repeater usage

Requires R58 firmware 3.Yz or greater.

The RX front-end DAC can be used for generating CTCSS waveform for TX. The modification is easy and requires just two components, a polystyrene 100n capacitor and a 10k resistor to be installed on the A8 audio board beneath the P8 processor board. All settings are adjusted by the handset.

Solder points for the components
Components laid in place

Parameters:

GE:CtCSSt CTCSS frequency in hertz. For frequencies with decimals, use the nearest full hz. eg. 118.8hz would be 119 and 74.4hz would be 74

PH:CtCGEn option rFcdAc selects the RX RFC DAC output to be used as CTCSS waveform generator during TX.

PH:CtGAin sets the amplitude of the generated waveform.

PH:CtHAnG sets the TOC time in millseconds. TOC eliminates the squelch crash at the receiving station, suspending the CTCSS tone transmission prior to the drop of the carrier.

Improved CTCSS tone filtering

Replaces 330kohm resistor and 100nF cap:

  >--- 22kohm ---+--- 22kohm ---+--- 330kohm ----- 15 nF ----> output
                 |              |         
                === 15nF       === 15nF
                 |              |
                 |              |
                GND            GND 

Capasitors can be between 10...20 nF, resistors 18...27 kohm.

CTCSS generation/encoding for R58 repeater

CTCSS decoder installation for R58 (both repeater and non-repeater usage)

General-purpose outputs

DTMF decoder installation for R58 (both repeater and non-repeater usage)

Wiring R58 for external controller usage (both repeater and simplex gateway usage)