We make new modem for diy use. Can be use as a transparent UART modem. Board have also USB to UART converter.
433MHz (414-454MHz) 100mW (20dBm) Super Long Distance LoRa Wireless data modem with USB and UART interface.
General:
LoRa LRS series is a low cost, high performance transparent transceiver with operating at 433MHz. It is LoRa/FSK/ GFSK/OOK modulation variety. It features small size, high output power, high sensitivity, long transmission distance and most of the parameters can be set via the command. Receive and send data to automatically switch. U s e generic UART interface. It is easy to realize the wireless data transmission with only providing the UART data. It is flexible for the users to set the UART baud rate, output power, data rate, frequency select, modulation mode select etc parameters. It is your ideal choice for designing wireless data transmission products which can be widely used on wireless data transmission field.
Features:
- Low cost, high performance , high reliability
- LoRa/FSK/GFSK/OOK modulation, 2-way half –duplex communication, strong anti-interfere
- Frequency Hopping Spread Spectrum
- 414-454MHz ISM band，globally license free.
- Maximal output power100mW(20dBm)，output power adjustable between 2-20dBm
- LORA Sensitivity -139dBm
- Supply current for Tx 130mA@20dBm, 35mA@13dBm
- Supply current for Rx 16mA
- Low current sleep mode 2uA
- Standard UART interface and USB interface
- Operation frequency can be configured, acceptable for several modules working in different frequency with no disturbance on each other.
- RF parameters as needed, users can be modulated by software
- Easily use, auto exchange on communication & transceiver
- Communication speed 1.2kbps -115.2kbps，can be modulated through software
- Afford Sleep control signal，user self control work duty cycle
- With LED indication
- Longer transmission distance，over 5Km in open air
- Small size 42x30mm， USB connector and 4 pin connector for UART
- Weight 8 gramm
- SMA antenna connector
- Tuning free
- Accord FCC,ETSI standard
Comments
I looked at LoRa modems some time ago. I think Semtech somewhat misrepresent their product. Just like with any other data you have to compare apples to apples, and they make it as hard as possible. Since max power output of Semtech modem is the same as of those chips made by the competition (i.e. Si1000 used in RFD900 and 3DR) then all the range gain you can get is by improving your receive sensitivity. So let have a look at those number:
For SX1272 (aka LoRa modem):
Data rate(bps) Receive sensitivity (dBm) Data rate(bps) Receive sensitivity (dBm)
SX1272 Si1000
293 -137 N/A
586 -134 N/A
1172 -131 N/A
3750 -116 N/A
9380 -122 2000 -121
18750 -115 N/A
37500 -112 40000 -108
N/A 100000 -104
N/A 125000 -101
Now from this data you can see that LoRa can increase range of your communications if you are trying to send a couple of dozen bytes per second. However at higher data rates it doesn't offer any significant advantages.It's niche market would be unattended sensors that send small packets of data. However for higher bandwidth telemetry application LoRa is not very well suited. Now the same chip can also work with other types of modulations which would be comparable with Si1000, but if you trying to market a product stating that it is a long range data modem, you should probably specify that at those long ranges you will have a bandwidth lower than that of a fax machine.
What kind of Software is running on the modem? Is it possible to log the link quality in a similar way as on SiK?
Power can be adjusted from 0 to 20dBm
433 is super important for non-us market and up to now we've not had a long range off the shelf option. This is great, CSG, thanks!
Ignore the moron troll Darius, read here if you want the full subtext of his reply to you:
http://diydrones.com/forum/topics/who-is-legally-accountable-in-cas...
Since 3DR stopped making and selling its telemetry radios, we need to have as serious product alternatives. LoraWan technology might our best bet as it allows for very long range remaining totally legal.
We make now also 915MHz version. 433MHz and 868MHz version designed for EU market
>What is the difference with a normal 433MHz telemetry solution ??, can you make a comparisson table ?
5Km with 20dBm is nothing: The 5Km path loss at 433MHz is around 100dB (using isotropic antenna's) so with 20dBm transmission power you have -80dBm at the receiver input. I tested my 18$ "3DR radio telemetry..) solution with 0dBm TX power, over 11Km with isotropic antenna's: works perfect (still 20 dB noise margin) as long as you have line of sight and no RF noise from your own PC.
Range more than 5km. You can see I write 5+ km This modem have LoRa modulation. More about this modulation you can read on this page
http://www.semtech.com/images/datasheet/an1200.22.pdf
Because China uses 433, LoRa radios are fantastic its what is in Trappys Crossfire. The modules themselves are cheap and pin compatible with earlier types. I am looking at several different ones as I type. Experimenting with them for other purposes.
Hi @CSG,
I notice that you also have a 868 MHz version, I searched on Canadian documentation on radio frequencies - I think it's the same as in the US - and, unless I am wrong, I do not think it is usable without HAM certification. Perhaps a novice question, but why not use 915 mhz?
Hi @Dan,
I'm sure that it's configurable, so you'd be able to lock it into the 433MHz. Here is AUS it's not part of our ISM band either (Region 3) but we do have a Low Interference Potential Devices which allow for a limited band at 25mW.
I think the ISM band they are referring to is for Region 1 (Europe?). Maybe the globally part should be removed to avoid confusion?
Chris
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