Re: [Freetel-codec2] Multi channel fsk/4fsk decoder

Hi Leon, For non-coherent FSK demodulators, you require deviation to be at least the symbol rate Rs. So for 600 baud 2FSK, thats at least 600Hz shift (deviation). The FSK demod is low complexity, and the processing is proportional to bit rate. So my gut feel is 10 600-baud demods running

Re: [Freetel-codec2] Help Wanted

Hi all, Just bear with me here, My experience with some of the brandmeister guys has been less than spectacular. There is no reason we cannot use "dmr framing" and use codec2 to transmit stuff, effectively splitting a dmr channel into 4 potential codec2 slots. I have revamped the adf7021 hotspot

Re: [Freetel-codec2] Multi channel fsk/4fsk decoder

Interesting -- I have done codec2 over LoRa and now working on putting some other frills on it. :-). On 8 March 2018 at 17:43, Leon Lessing wrote: > Hi guys, > Thought I was subscribed here, found out with a bang that I am not. > > Here goes. > Doing investigations into Lora

Re: [Freetel-codec2] Multi channel fsk/4fsk decoder

While Chirp is a form of spread spectrum, it is not designed for multiple access. Chirp is also used on most modern radars for pulse compression. You can't have two radars on the same frequency :-) I tried a couple of LORA modules, and without an antenna they worked swell across the house. I was

Re: [Freetel-codec2] Multi channel fsk/4fsk decoder

Hi Alan, This Lora is driving me nuts, it seems I am asking questions they cannot answer, or I am stupid. Here is a description of the downlink strategy (sigfox seems to have the same strategy, only they have a window in which the base can talk back)

Re: [Freetel-codec2] Help Wanted

Hi Alan, > > I ask, how far are we in being able to completely replace the firmware > in the lowly MD-380 and clone radios? Or, could we beef up the power in > the 7021, already used in the project!! > That (as in running Codec2 2400A) will never happen for technical reasons. Using an SDR

Re: [Freetel-codec2] Help Wanted

Hi all, I've put an post on the MMDVM email group asking them to consider Lower BitRate modes and alternate Codecs. Clearly the respondents thus far cannot Think Outside the Square. One complained: "Codec2 doesn't have a Network (in place)" On the BitRate front they ALREADY have a lower

Re: [Freetel-codec2] Multi channel fsk/4fsk decoder

Hi Leon and all, I quickly read the article: https://store.outernet.is/blogs/the-official-outernet-blog/world-record and https://hackaday.com/2018/02/22/at-71572-km-you-wont-beat-this-lora-record/ I didn't see TWO WAY communication shown in their article, only a Downlink. Is this the case?

[Freetel-codec2] Multi channel fsk/4fsk decoder

Hi guys, Thought I was subscribed here, found out with a bang that I am not. Here goes. Doing investigations into Lora it seems their spectrum utilization really sucks, in that on 125kHz channel only one device can talk at 240bit/s at a time (class A device). I honestly thought that being spread