LowPowerLab Forum

Hardware support => RF - Range - Antennas - RFM69 library => Topic started by: eowe on March 13, 2018, 07:15:07 AM

Title: Can't Adjust Frequency
Post by: eowe on March 13, 2018, 07:15:07 AM

I can easily configure freq of module between 430 - 500 MHz.
Used and suggested registers values as above which is succesfully working:
0x07 => 0x6c    //434MHz
0x08 => 0x80
0x09 => 0x00

But When I set the registers according to 915 MHz.Module Cant Trasmitting.I do not see anything in the frequency analyzer.
0x07 => 0xe4  //915MHz
0x08 => 0xc0
0x09 ?> 0x00   


I do not change anything except the registers above when I change freq. from 430 Mhz to 915Mhz.
What is the reason for this?
Could it be related to the antenna?

Title: Re: Can't Adjust Frequency
Post by: LukaQ on March 13, 2018, 08:22:15 AM

#define FREQUENCY       RF69_915MHZ

Code: [Select]

radio.initialize(FREQUENCY,NODEID,NETWORKID);

#define FREQUENCY_EXACT 916000000

Code: [Select]

#ifdef FREQUENCY_EXACT
  radio.setFrequency(FREQUENCY_EXACT); //set frequency to some custom frequency
#endif 

And you have to stay in limits for your module you bought, you can't set 915MHz with 433MHz module

Title: Re: Can't Adjust Frequency
Post by: eowe on March 13, 2018, 08:38:43 AM

Quote from: LukaQ on March 13, 2018, 08:22:15 AM

#define FREQUENCY       RF69_915MHZ

Code: [Select]

radio.initialize(FREQUENCY,NODEID,NETWORKID);

#define FREQUENCY_EXACT 916000000

Code: [Select]

#ifdef FREQUENCY_EXACT
  radio.setFrequency(FREQUENCY_EXACT); //set frequency to some custom frequency
#endif 

And you have to stay in limits for your module you bought, you can't set 915MHz with 433MHz module

And you have to stay in limits for your module you bought, you can't set 915MHz with 433MHz module This is the exact answer what I'm looking for.Thank you!

Title: Re: Can't Adjust Frequency
Post by: LukaQ on March 13, 2018, 10:37:39 AM

Quote from: eowe on March 13, 2018, 08:38:43 AM

And you have to stay in limits for your module you bought, you can't set 915MHz with 433MHz module This is the exact answer what I'm looking for.Thank you!

And to add to that, IC itself can be programmed with any freq from <315MHz to above 1G, BUT components outside IC limit working range, those passives