search

M17-Project / TR-9

TR-9 - M17 protocol compatible handheld - schematics, PCB design files, BOM.
https://m17project.org/
GNU General Public License v2.0
161 stars 20 forks source link

AX5043 as RFIC? #4

Open radonyl opened 3 years ago

radonyl commented 3 years ago

since APRS(AFSK mod) and analog FM are listed in feature list, I'd recommend AX5043 as the RFIC which has AFSK demod embedded (vital for power saving by WOR mode) and also analog mode(even AM). check this project for a proof of practise.

Btw, AX5043's sensitivity is higher -126 vs -122 with even lower price 1.2$ vs 2.4$ and half current 10ma vs 20ma.

sp5wwp commented 3 years ago

What is the roll-off factor for the Raised Cosine filter (AMPLSHAPE=1)? I can't find any info here: https://www.onsemi.com/pub/Collateral/AND9347-D.PDF

sp5wwp commented 2 years ago

AX5043 is a cool little chip. I'm testing its performance right now. M17 mode TX is possible.

f4grx commented 2 years ago

Looks like a nice chip.

Is it easy to program arbitrarily without having to generate static RF config from proprietary tools?

Also careful, it has an interoperability erratum: GFSK may not work well with other non-onsemi transceivers.

https://www.onsemi.com/pub/collateral/ax5043-err-d.pdf

sp5wwp commented 2 years ago

See this gist.

ng91 commented 2 years ago

It's nice chip because it has many modulations that other chips lack of.

f4grx commented 2 years ago

Definitely!

@sp5wwp thats great! BTW I suggest avoiding floating point in embedded code :) Also memcpy for 1 byte could definitely be optimized ;D

A shame that the devboard is so expensive and the MOQ is 5 at farnell, I would have got one asap!