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Rivi 24: | Rivi 24: | ||
== 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 | ||
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=== 15nF === 15nF | |||
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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.
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.