On 28 June 2018 at 03:29, Neil <***@narwani.org> wrote:
> I've just started looking for something similar (for a telepresence
> robot) but don't want to be on 2.4Ghz since there's too much else on
> there nowadays.
I've been (idly) wondering for some while how practical it would beto use
LORA based equipment for voice communications.
Using existing IP voice software it should essentially be a matter of plug
in and go - how hard can it be [tm] :-).
LORA TXRX modules are available for under $US20
______________________________
ADAFRUIT transceiver. Digikey $US19.95/1 / Uses RF solutions modules.
Adafruit RFM69HCW and RFM9X LoRa Packet Radio Breakouts
https://cdn-learn.adafruit.com/downloads/pdf/adafruit-rfm69hcw-and-rfm96-rfm95-rfm98-lora-packet-padio-breakouts.pdf
RFM69HCW in either 433 MHz or 868/915MHz
The RFM69 radios have a range of approx. 500 meters line of sight with
tuned uni-directional antennas. Depending on obstructions, frequency,
antenna and power output, you will get lower ranges - especially if you are
not line of sight.
The RFM69 radios have a range of approx. 500 meters line of sight with
tuned uni-directional antennas. Depending on obstructions, frequency,
antenna and power output, you will get lower ranges - especially if you are
not line of sight. What ranges can I expect for RFM9X LoRa radios? The
RFM9x radios have a range of up to 2 km line of sight with tuned
uni-directional antennas. Depending on obstructions, frequency, antenna and
power output, you will get lower ranges - especially if you are not line of
sight
All other things being equal (antenna, power output, location) you will
get better range with LoRa than with RFM69 modules. We've found 50% to 100%
range improvement is common.
___________________
*Microchip RN2483 *
$13.18
$
https://www.digikey.com/product-detail/en/microchip-technology/RN2483A-I-RM104/RN2
2 page summary / glossy -
http://ww1.microchip.com/downloads/en/DeviceDoc/70005219A.pdf
RN2483 data sheet -
http://ww1.microchip.com/downloads/en/DeviceDoc/50002346C.pdf
Circuit diagram -
Click thumbnails on:
https://www.digikey.com/reference-designs/en/wireless-communication/transceivers-txrx/24
https://media.digikey.com/Photos/RDL/DV164140-1%20-%20Schematic%201%20-%20Full.png
________________________
Murata
$US17.82/1
https://wireless.murata.com/RFM/data/type_abz.pdf
https://wireless.murata.com/RFM/data/typeabz_brief.pdf
12.5 x 11.6 x 1.76 mm metal shielded package •
Comprises a *Semtech SX1276 *ultra long range spread spectrum wireless
transceiver and an *STMicro STM32L0 series ARM Cortex M0+ 32 bit
microcontroller *(MCU) • Communication with the module can be achieved via
UART, SPI, or I2C peripheral interfaces • Includes 192kB flash and 20kB
RAM, and an optional STSAFE secure element can be incorporated into the MCU
to enhance the network security capabilities
___________________________
RF Solutions
16mm x 16mm
$17.11/1
http://www.hoperf.com/upload/rf/RFM95_96_97_98W.pdf
D
igikey "catalog" page -
https://www.digikey.com/catalog/en/partgroup/rfm95w-868s2/50906?mpart=RFM95W-915S2&vendor=357
The RFM95/96/97/98(W) transceivers feature the LoRa™ long-range modem that
provides ultra-long range spread spectrum communication and high
interference immunity while minimizing current consumption. Using Hope RF’s
patented LoRa™ modulation technique RFM95/96/97/98(W) can achieve a
sensitivity of over 148dBm using a low cost crystal and bill of materials.
The high sensitivity combined with the integrated +20dBm power amplifier
yields industry leading link budget making it optimal for any application
requiring range or robustness. LoRa™ also provides significant advantages
in both blocking and selectivity over conventional modulation techniques,
solving the traditional design compromise between range, interference
immunity and energy consumption. These devices also support high
performance (G)FSK modes for systems including WMBus, IEEE802.15.4g. The
RFM95/96/97/98(W) deliver exceptional phase noise, selectivity, receiver
linearity and IIP3 for significantly lower current consumption than
competing devices.
____________________________
LORA transceiver modules
https://www.digikey.com/products/en/rf-if-and-rfid/rf-transceiver-modules/872?FV=ffe00368&quantity=&ColumnSort=7&page=1&k=lora&pageSize=25
SEEED
RM95 $7.09/1
RM 95 96 97 98
https://github.com/SeeedDocument/RFM95-98_LoRa_Module/blob/master/RFM95_96_97_98_DataSheet.pdf
https://www.digikey.com/products/en?mpart=109990165&v=1597
$ -
https://www.digikey.com/product-detail/en/seeed-technology-co-ltd/109990166/1597-1488-ND/7033232
_____________________________
DF Robot Firebeetle TX only
$18.34
https://media.digikey.com/pdf/Data%20Sheets/DFRobot%20PDFs/TEL0121_Web.pdf
__________________________
LORA PCBAs. Legion
$19.95 - $1000 !
https://www.digikey.com/products/en/rf-if-and-rfid/rf-evaluation-and-development-kits-boards/859?FV=ffe0035b&quantity=&ColumnSort=1000011&page=1&k=lora&pageSize=100
____________________
"Daughter cards"
https://www.digikey.com/products/en/development-boards-kits-programmers/evaluation-boards-expansion-boards-daughter-cards/797?FV=ffe0031d&quantity=&ColumnSort=1000011&page=1&k=lora&pageSize=100
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