Updated First steps into APRS over LoRa (markdown)

First-steps-into-APRS-over-LoRa.md

@@ -7,19 +7,19 @@ APRS LoRa iGate is a full standalone ESP32 iGate with RX/TX and digipeating supp
 
 # Bands of operation
 There are several bands, where different LoRa modules could operate:
-- [✗] **~160-173.5 MHz**, untested, outside of amateur and ISM radio band plans, not possible to use, E32-170T30D, https://www.manualslib.com/manual/1606382/Ebyte-E32-170t30d.html
+- [✗] **~160-173.5 MHz**, untested, outside of amateur and ISM radio band plans, not possible to use, E32-170T30D modules, https://www.manualslib.com/manual/1606382/Ebyte-E32-170t30d.html
 - [✓] **~410-480 MHz**, 433.775 MHz is the center of operation inside the amateur radio band plan in IARU1 region (EU/US) 
   - frequency of operation is choosen based on proposal from https://vienna.iaru-r1.org/wp-content/uploads/2019/01/VIE19-C5-015-OEVSV-LORA-APRS-433-MHz.pdf
   - maximum bandwidth in IARU1 region for 433 MHz band is limited to 20 KHz, which requires stable TXCO sources or automatic frequency correction, it might also be possible to run at 125 KHz depending on the region and local band plan
 - [✓] **~868 MHz**, untested, outside of amateur radio band plan, but possible to run using ISM band plan
 - [✓] **~915 MHz**, untested, operation inside the amateur radio band plan in IARU2 region (US)
-- [✓] **~2400 MHz**, untested, inside the amateur band plan, also possible to run using ISM band plan
+- [✓] **~2400 MHz**, untested, inside the amateur band plan, also possible to run using ISM band plan, E28-2G4M27S modules, https://www.manualslib.com/manual/1591128/Ebyte-E28-2g4m27s.html
 
 # Througput and signal levels
 LoRa modules support various SF (spreading factors) and various bandwidths, table below summarizes possible options, with the maximum reasonable speed and signal level:
 - 433 MHz: ranging from 292 bps (SF9, -138 dbm) up to 1560 bps (SF6, -128 dBm) for legal 433 MHz 20kHz channel
 - 868/915MHz: ranging from 293 bps (SF12, -137 dbm) up to 9375 bps (SF6, -118 dBm) for legal 868 Mhz 125kHz channel
-- 2400Mhz: up to 2 Mbps, up to 27 dBm, E28-2G4M27S modules, https://www.manualslib.com/manual/1591128/Ebyte-E28-2g4m27s.html
+- 2400Mhz: up to 2 Mbps, up to 27 dBm
 
 ![](https://github.com/sh123/esp32_loraprs/blob/master/images/bandwidth_vs_sf.jpg)