oden wrote:
Can I ask how, or what you did? Would like to repeat your tests.
Hi Oden,
I just stumbled across this forum while googling this sort of thing so I'm not sure what you are using/doing and how compatible this is with what i'm doing (I.e I'm not sure what openlrsng is).
I am programming the RFM23BP directly via the SPI ports of a PIC18F microcontroller. This gives me full control over the module and allows me to TX/RX my own code (I.e Whatever I want). Changing from 433 to 472 Mhz is not a simple matter of changing the frequency band select register, there are a bunch of register changes involved however the spreadsheet mentioned takes care of all of these for you and makes it pretty simple . The code I am using to set the registers is as follows:
char config1[2] = {0x3B, 0x40}; //Start reg = 0x1C
char config2[6] = {0x7D, 0x00, 0x83, 0x12, 0x04, 0x1B}; //Start reg = 0x20
char config2a = 0x10; //Start reg = 0x2A
char config3[3] = {0x19, 0x38, 0x27}; //Start reg = 0x2C
char config4 = 0xAC; //start reg = 0x30
char config5[21] = {0x00, 0x02, 0x08, 0x22, 0x2D, 0xD4, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x04, 0x00, 0x00,
0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF}; //Start reg = 0x32
char config6[2] = {0x10, 0x62}; //Start reg = 0x6E
char config7[3] = {0x2A, 0x23, 0x03}; //Start reg = 0x70
char config8[3] = {0x57, 0x33, 0x80}; //Start reg = 0x75
This is at a 2kbs data rate (For max range), a narrow BW (For min noise), Manchester encoding and packet handling enabled.
I have since replaced the antenna with a 474Mhz 1/4 wave and this now maxs out the RSSI whenever at close range.
Like I said, i'm not sure what you're doing and if any of this even relates but feel free to ask any more questions. I can send you my code if desired, it is programmed in C using XC8.
I have done some more testing regarding the power output and as Kilrah said it will not be possible to get these below 100mW so technically they are against the regs. I'm changing to the RFM22b module which has a TX power of 100mW.
It is legal to Tx up to 1watt in the 915Mhz band so this may be the best option for you.
Regards,
Harro