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Add reference to Hitec

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docs/Frequency_Tuning.md
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@ -6,17 +6,18 @@ The protocols which require frequency tuning are:
* **FrSkyV** (e.g. FrSky V8R4, V8R7 and V8FR receivers)
* **FrSkyX** (e.g. FrSky X4R, X6R, X8R, and XSR receivers)
* **S-FHSS** (e.g. Futaba S-FHSS receivers)
* **Corona** (e.g. Corona V1 FSS and Corona V2 DSSS CR8D/CR6D/CR4D receivers)
* **Corona** (e.g. Corona V1 FSS, Corona V2 DSSS CR8D/CR6D/CR4D and FlyDream IS-4R/IS-4R0 receivers)
* **Hitec** (e.g. Optima, Minima, Micro and RED receivers)
There is a [video](#video) at the end of this page which gives an example of the tuning process.
## More information
Original FrSky, Futaba and Corona receivers have been frequency-tuned by the manufacturer at the factory. Because of variations in the oscillator crystals used in multiprotocol modules it is necessary to fine-tune the module to match the manufacturer frequencies.
Original FrSky, Futaba, Corona and Hitec receivers have been frequency-tuned by the manufacturer at the factory. Because of variations in the oscillator crystals used in multiprotocol modules it is necessary to fine-tune the module to match the manufacturer frequencies.
'Compatible' receivers suffer the same variation in crystal oscillators as multiprotocol modules, but have to be compatible with genuine (manufacturer-tuned) transmitters so they will typically have auto-tuning built in, and will self-tune to the radio's frequency when they are bound.
## Fine-tuning procedure
**Note:** For best results, the fine-tuning procedure should be carried out with a genuine FrSky or Futaba receiver.
**Note:** For best results, the fine-tuning procedure should be carried out with a genuine FrSky/Futaba/Corona/Hitec receiver.
The procedure can be performed in serial or PPM mode, but is easier with in serial mode where the effect of the change can be seen in real-time.
@ -61,8 +62,8 @@ These settings can also be used to force different tuning values for different m
/*******************************/
/*** CC2500 FREQUENCY TUNING ***/
/*******************************/
//For optimal performance the CC2500 RF module used by the FrSkyD, FrSkyV, FrSkyX, SFHSS and CORONA protocols needs to be tuned for each protocol.
//Initial tuning should be done via the radio menu with a genuine FrSky or Futaba receiver.
//For optimal performance the CC2500 RF module used by the FrSkyD, FrSkyV, FrSkyX, SFHSS, CORONA and Hitec protocols needs to be tuned for each protocol.
//Initial tuning should be done via the radio menu with a genuine FrSky/Futaba/CORONA/Hitec receiver.
//Once a good tuning value is found it can be set here and will override the radio's 'option' setting for all existing and new models which use that protocol.
//Valid range is -127 to +127
//Uncomment the lines below (remove the "//") and set an appropriate value (replace the "0") to enable.
@ -71,6 +72,7 @@ These settings can also be used to force different tuning values for different m
//#define FORCE_FRSKYX_TUNING 0
//#define FORCE_SFHSS_TUNING 0
//#define FORCE_CORONA_TUNING 0
//#define FORCE_HITEC_TUNING 0
```
## Video