search

KrisKasprzak / EBYTE

Libraries to program and use UART-based EBYTE wireless data transceivers
239 stars 75 forks source link

Channel spacing - 1 MHz ! 433MHz #21

Closed Cloolalang closed 3 years ago

Cloolalang commented 4 years ago

Hi guys, am I incorrect with my discovery that my E23-TTL-100 433MHz lora Uart radio only does 1MHz channels?! So ISM band is 433.050 to 434.790 MHz where I am, The Bandwidth for Lora Phy at 0.3Kb on-air is 125KHz. That would allow for: 433.000 Channel 1 433.125 Channel 2 - not available on this device. 433.250 Channel 3 - not available on this device. 433.375 Channel 4 - not available on this device. 433.500 Channel 5 -not available on this device.

.....

Really? only 2 ISM 433 MHz usable frequencies?

Please tell me that these is better firmware for operating a finer frequency selection.

Please! Please! P

KrisKasprzak commented 4 years ago

I would recommend you read the data sheet E32-433T20DC-成都亿佰特电子科技有限公司

E32-433T20DC-成都亿佰特电子科技有限公司

赛门仕博,www.symansbon.cn

|

|

|

that unit is 410 mhz to 441 mhz. the channel sets the frequency within that range in 1mhz increments hence 31 different channels

Thanks, Kris Kasprzakkris.kasprzak@yahoo.com

On Monday, July 13, 2020, 12:45:33 PM CDT, Cloolalang <notifications@github.com> wrote:

Hi guys, am I incorrect with my discovery that my E23-TTL-100 433MHz lora Uart radio only does 1MHz channels?! So ISM band is 433.050 to 434.790 MHz where I am, The Bandwidth for Lora Phy at 0.3Kb on-air is 125KHz. That would allow for: 433.000 Channel 1 433.125 Channel 2 - not available on this device. 433.250 Channel 3 - not available on this device. 433.375 Channel 4 - not available on this device. 455.500 Channel 5 -not available on this device.

.....

Really? only 2 ISM 433 MHz usable frequencies?

Please tell me that these is better firmware for operating a finer frequency selection.

Please! Please! P

— You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub, or unsubscribe.

Cloolalang commented 4 years ago

Hi Kris, Thank-you for taking a look! OK so yes, I am correct, I can only legally use: channel 24 (434.000 MHz) assuming I reduce the output power to low enough and keep the duty cycle correct. Also I see that there does not appear to be any CAD mode implemented for the module (this is reduce collisions like "listen-before-transmit"). The other 30 RF channels cannot be used without a license. P

KrisKasprzak commented 4 years ago

where is it written that the only legal frequency is 434 mhz?

On Tuesday, July 14, 2020, 04:00:46 AM CDT, Cloolalang <notifications@github.com> wrote:

Hi Kris, Thank-you for taking a look! OK so yes, I am correct, I can only legally use: channel 24 (434.000 MHz) assuming I reduce the output power to low enough and keep the duty cycle correct. Also I see that there does not appear to be any CAD mode implemented for the module (this is reduce collisions like "listen-before-transmit"). The other 30 RF channels cannot be used without a license. P

— You are receiving this because you commented.

Reply to this email directly, view it on GitHub, or unsubscribe.

Cloolalang commented 4 years ago

Hi Kris. https://www.ofcom.org.uk/__data/assets/pdf_file/0028/84970/ir-2030.pdf See pages 21 & 22. p

KrisKasprzak commented 3 years ago

The channel frequencies are based on the chip not much you can do about it