Recent posts

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1
General discussion / Re: Introduction
Last post by krzysztof - February 18, 2020, 12:35:40 pm
Hello, New here :), my name is Krzysztof
formerly LX1KP now SQ5PI, I live near Warsaw in Nowy Dwór. By proffesion I am embedded SW developer with some HW experience, looking forward do do some coding here.
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Technical / Re: M17 Reflector
Last post by SP5WWP - February 16, 2020, 06:41:42 pm
Hello!
Sorry for a late reply. No plans for reflectors yet. We are still working on hardware (handheld) and the protocol spec.
3
Technical / M17 Reflector
Last post by AD8DP - February 10, 2020, 07:55:12 pm
Hi,

I'm really interested in this project.  Are there has been any plans for an Internet reflector yet?  I saw the hostpot project and talk about tests sending/receiving UDP frames on Github.  Maybe it's too early for this, but I'd like to add M17/Codec2 support to my DUDE-Star/DroidStar software (details on QRZ) that allows network based RX/TX, similar to BlueDV and friends. It would be a good way to get a thorough understanding of Codec2 and the M17 protocol, before I get my hands dirty and start building some hardware.

-Doug AD8DP
4
Technical / Re: TR-9 Frequencies?
Last post by SP5WWP - February 08, 2020, 10:32:54 am
I have successfully tuned the ADF chip from 430 to 460 megs. Gonna check 420..430 range too.
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General discussion / Re: Podcasts
Last post by SP5WWP - February 07, 2020, 08:11:38 pm
Yeah, M17 appeared in at least 3 different podcasts :)
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Technical / Re: New version of M17_ANL !
Last post by SP5WWP - February 07, 2020, 08:10:30 pm
Yeah, an MMDVM HS hat.
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Technical / Re: TR-9 - RF power amplifier
Last post by SP5WWP - February 07, 2020, 08:07:30 pm
Output power: 1W on low setting, 3 to 5W on high
Gain: ADF can supply 13dBm. See diagram below.
Linearity: we don't care about linearity. You got it right.
Stability, technology: See diagram below.
Supply: 7.4V from Li-Ion.
Regulatory: glad to be in a place, where we don't have to care about FCC :) hehe. We are going to measure that. We use a basic LC pi-topology filter, see the schematic for details.

8
Technical / Why is M17 better? -- Maybe i...
Last post by WA4OSH - February 07, 2020, 05:50:19 pm
I'm really tired of people connecting to repeaters asking for a signal check?  How well are you making the repeater?  Kerchunk the repeater or hotspot should and it should be able to tell you during the squelch tail how well you are being received and your radio should be able to set the minimum needed power out to make the trip at full quieting.

Can those "empty" bits in the voice stream in the squelch tail be filled with RSSI measurements and power control information?

9
General discussion / Podcasts
Last post by WA4OSH - February 07, 2020, 05:13:43 pm
I discovered this project through a very interesting Podcast...

Ham Radio Workbench - HRWB093  M17 Open Source Digital Radio System
https://www.hamradioworkbench.com/podcast/M17-Open-Source-Digital-Radio-System

--Konrad, WA4OSH/7
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Technical / Re: New version of M17_ANL !
Last post by WA4OSH - February 07, 2020, 05:08:09 pm
So is there an off-the-shelf MMDVM board that has the ADF7041 and the STM32F103C8T6 microcontroller already on it (just to have something to test against)?

--Konrad, WA4OSH/7
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