Recent posts

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General discussion / Re: certificate...
Last post by SP5WWP - April 15, 2020, 12:20:53 pm
Fixed by KC1AWV :)
General discussion / certificate has...
Last post by N6NZ - April 05, 2020, 06:02:22 am
Just noticed today.  Firefox has gotten whiney.  Need a new cert. -n6nz
Technical / Re: M17 Reflector
Last post by AD8DP - March 07, 2020, 10:38:46 pm
I figured, just thought I'd ask.  I'll be watching closely, this is a cool project.
Technical / Re: TR-9 analog mode?
Last post by SP5WWP - March 04, 2020, 08:19:59 pm
Analog mode capability in TR-9 is 100% confirmed. A quick test with ADF7021 showed it's possible. I have even added a CTCSS tone of 127.3Hz to the audio stream and it worked fine.
Technical / Re: TR-9 - case
Last post by SP5WWP - March 04, 2020, 08:17:35 pm
We have almost finished developing the mainboard, the dimensions are approximately 45x105mm.
Technical / Re: Error Correction Coding
Last post by SP5WWP - March 04, 2020, 08:16:27 pm
I have encoded the Link Information Channel (LICH) with 24,12 Golay (since its partitioned into 48-bit chunks). The rest is going to be convolutionally coded with constraint K=5 and punctured (exactly like in NXDN, but with a different puncturing matrix).

Check this thread for details (post #1):
Technical / Re: Why is M17 better? -- May...
Last post by SP5WWP - March 04, 2020, 08:13:06 pm
I don't think that measuring RSSI once per transmission is a good idea. We are going to use ping for that (ask repeater for response).
Technical / Re: M17 frame description
Last post by SP5WWP - March 04, 2020, 07:59:54 pm
Please take a look at my newest proposal (I have edited post #1).
General discussion / Re: Introduction
Last post by va3sfa - March 04, 2020, 12:20:41 am

My name is Faisal, and I have been licenced since 1995.

I am really interested in this project after listening to the Ham Radio Podcast episode on M17.

I can't wait to get started on building a couple TR-9s and start using this.

73 DE VA3SFA/W6 (Faisal)
General discussion / Re: Introduction
Last post by WA4OSH - February 20, 2020, 07:38:13 am
Hi!  I'm Konrad.  I'm RF Test engineer by occupation and a ham for over 40 years.  I enjoy operating on VHF, UHF and Microwave bands. I love homebrewing radio gear.

73, Konrad   
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