Sounds like you are really deep into this stuff.
And I’m beginning to get back into it too.
In the past I’ve used HopeRF modules…even though they looked a bit dodgy. They use Semtech chips that don’t even say Semtech on the outside. And their datasheets basically are a clone of the Semtech ones, with all referrals to Semtech removed.
Most of the HopeRF modules I bought in the past were from Anarduino dot com. They currently list a FCC certified RFM95CW-915S2 915Mhz LoRa Module for $6.50. I don’t know if this is the older SX1270 or newer SX1260 family.
Anyway…I want to the newer SX1262 at 915Hhz…and I want to find an alternative manufacturer than HopeRF.
Yes, I’ve been watching the Murata modules…specifically the one still under development that will house the SX1262. It’s model number is “LBAA0QB1SJ-295”…10x8mm. I haven’t seen any data on it yet.
Murata is pricey…but I’m sure the Japanese quality is a step up…
Yes, I’ve looked also at the two older Murata parts which are 12.5x11.6mm in size:
CMWX1ZZABZ-104 is UART driven…
I don’t like that…
I don’t want a UART command line interface.
I want SPI to talk to the bare-metal registers.
CMWX1ZZABZ has all the interfaces UART, I2c, SPI, and USB.
This second one is better.
But I’m not thrilled with having the solder pads on the bottom.
I want either castellated mounting holes along the sides (like HopeRF), or bottom pads that wrap a short way up the sides.
Either of those are solderable with a conventional soldering iron.
And the CPU chips under the covers of the Murata Modules are,STM32L072 or STM32L082. Both are Cortex-0+, and pretty old in the tooth. I need even less horsepower than these chips…but way more energy efficiency.
Finally, I did find what looks like a nice sx1262 RF module, and at a very reasonable price. Go out to Tindie dot com and search for “DRF1262T”. You will see and number of modules…but select the one with TCXO Resonator…price is currently discounted to $4.98 from $5.53. It also shows an FCC Approval Number on the outside
When you order it, select the 915Mhz module to run in the US. The TCXO gives you -148dBm of sensitivity….vs. 137dBm for their lower end module running on an ordinary crystal. The size is 14x15.7mm…bigger than Murata…but a tad smaller than the 16x16 HopeRF.
They look pretty sweet to me.
If any of you out there have some experience with Dorji as a brand,…please chime in.