433MHz Super Long Distance FHSS LoRa Wireless data modem with USB UART 5+ km range

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.



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.



  • 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

Views: 12351

Comment by CSG on March 21, 2016 at 12:52am

Power can be adjusted from 0 to 20dBm

Comment by Ikaros on March 21, 2016 at 4:22am

What kind of Software is running on the modem? Is it possible to log the link quality in a similar way as on SiK?

Comment by Art on March 21, 2016 at 6:18am

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):

Now let's have a look at Si1000:

At the first glance LoRa modem can achieve -137dBm receive sensitivity compared to Si1000 -121dBm, which is pretty significant.  Now lets rearrange that data and compare the data rates that you can get with each modem for any given receive sensitivity:

 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.

Comment by Nikola Rabchevsky on March 21, 2016 at 8:36am

Is this a point-to-multipoint solution?

Comment by Martin on March 22, 2016 at 3:55am

@Guy McCaldin, do you have any experience with the Microhard radios?

$79 for an encrypted 2W radio is a pretty fair price I think.

Comment by John Rambo on March 22, 2016 at 4:20am

I've made it 73km with a simple dipole antenna attached to RF1276 (SX1276), and would have gone more, if I were higher, as I've reached a horizon limit. -148dB RX sensitivity. Not willing to promote anything, but 168dB link margin is quite something, especially when TX/RX pair costs $45. I'd say its a best LoRa stuff in a market today.

Truth, going at such a low bitrates requires modified telemetry protocols, messages as short as possible, sentences rotated. Native APM telemetry won't work.

Comment by Martin on March 22, 2016 at 7:06am

One thing I don't understand is that why so few radios have encryption. It's not hard to do, but it's an important feature for anyone doing commercial work with UAVs.

Comment by CSG on March 22, 2016 at 10:08am

We can make also AES encryption but can be problem with shipping.

Comment by Martin on March 22, 2016 at 10:31pm

I think it shouldn't be a problem inside EU - that's where CSG is located.

Comment by Thorsten on March 27, 2016 at 3:13am

Hi CSG, hi all,

Interesting product!

Can someone provide some info on ETSI/CE compliance and restrictions?

It seems that in Europe only the 868 MHz version is ETSI compliant. If I understand correctly, there is either a restricted duty cycle or Adaptive Frequency Agility (AFA) and Listen Before Talk (LBT).
For UAV telemetry operating with 1 or 10% duty cycle is not reasonable. So AFA+LBT is required.

@CSG what is implemented in your 868 MHz modules - Duty cycle or LBT + AFA?

Another thing regarding 433/868 MHz. As far as I know the common 433 SiK modules are not allowed because the user can change the power by himself via the firmware. Does this apply to the 868 MHz as well?

Thanks and best regards,


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