Usage

[Arkwin]

I might be dumb, but I am using rx_fm on a HackRF, I can see the standard output which I can pipe into multimon-ng, but how do I get that output into mmng-ui? Should I be using some other tool to send output to port 8888?

[lingfish]

Heya, not dumb at all!

I've not used rx_fm, but see it's a clone of rtl_fm. Both tools will output samples to a file, or standard output (and not the network), so you'll need nc (netcat) in the middle.

It also looks like rx_fm defaults to a sample rate of 24k, where multimon-ng wants 22050Hz.

So the chain of tools would look like this:

graph LR;
    rx_fm-->stdout --> netcat -->|UDP port x| mmng-ui --> A[multimon-ng run internally by mmng-ui];

Loading

Thus, a commandline might look like this (note the trailing dash before the pipe to nc!):

rx_fm -f 144.640M -s 22050 <other options> - | nc -u localhost 8888

Obviously run this after starting mmng-ui.

Hope this helps, let me know either way!

[lingfish]

Hi @Arkwin, did this help? All good?

[Arkwin]

Hey! Thanks. It helped some! I got it working, and by that I mean sending data to it. I just cannot seem to properly decode FLEX in my area.

[lingfish]

Good to hear -- do you mean in general, or specific to this project?

I don't even think FLEX is used in my area (Australia) as far as I know.

[Arkwin]

In general. I am using a HackRF and using rx_fm and I can pipe that nc to mmng-ui, but even without mmng-ui, I just get FLEX messages that are too garbled even after attempting correction. :(

[Arkwin]

For reference, this is all I get in multimon-ng.

[lingfish]

Hrm, yeah, dunno. I see a fair few issues at the multimon-ng repo around FLEX and 3200 baud, amongst others.

Have you tried any of the samples at sigid? I just tried both 1600 bps (success) and 3200 (epic fail).

[Arkwin]

I have not gotten that far, but did see the 3200 baud issues on the multimon-ng repo. Thank you for your help though! I will mess around with it some more. :)

…

________________________________ From: Jason Lingohr ***@***.***> Sent: Sunday, November 3, 2024 12:24:22 AM To: lingfish/mmng-ui ***@***.***> Cc: Kara Zajac ***@***.***>; Mention ***@***.***> Subject: Re: [lingfish/mmng-ui] Usage (Discussion #2) Hrm, yeah, dunno. I see a fair few issues at the multimon-ng repo around FLEX and 3200 baud, amongst others. Have you tried any of the samples at sigid<https://www.sigidwiki.com/wiki/FLEX>? I just tried both 1600 bps (success) and 3200 (epic fail). — Reply to this email directly, view it on GitHub<#2 (reply in thread)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/ADCBDGQ6CNPWYQ65TN2X6R3Z6WQPNAVCNFSM6AAAAABRCKSPRKVHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTCMJTGI2DIOA>. You are receiving this because you were mentioned.Message ID: ***@***.***>

[lingfish]

Yeah, I just tried with their 3200 sample and a recent build of multimon-ng, and it seems to mis-detect as 1600 baud and of course, that'd be a jumbled mess:

multimon-ng -a FLEX -t mp3 /tmp/Flex_3200.mp3 -v 3
multimon-ng 1.3.1
  (C) 1996/1997 by Tom Sailer HB9JNX/AE4WA
  (C) 2012-2024 by Elias Oenal
Available demodulators: POCSAG512 POCSAG1200 POCSAG2400 FLEX FLEX_NEXT EAS UFSK1200 CLIPFSK FMSFSK AFSK1200 AFSK2400 AFSK2400_2 AFSK2400_3 HAPN4800 FSK9600 DTMF ZVEI1 ZVEI2 ZVEI3 DZVEI PZVEI E
EA EIA CCIR MORSE_CW DUMPCSV X10 SCOPE
Enabled demodulators: FLEX
FLEX: Locked
FLEX: SyncInfoWord: sync_code=0xb068 baud=1600 levels=4 polarity=NEG zero=0.029322 envelope=0.125693 symrate=1600.403226
FLEX: State: FIW
FLEX: FrameInfoWord: cycleno=08 frameno=117 fix3=0x00 time=35:39 offset=0.00:00:00
FLEX: State: SYNC2
FLEX: State: DATA
FLEX: Phase A Fixed 2 errors @ 0x00800001  (0x4bc05407 -> 0x4b405406)
FLEX: Phase A Fixed 1 errors @ 0x00200000  (0x2d625967 -> 0x2d425967)
FLEX: Phase A Fixed 2 errors @ 0x00220000  (0x3ff2cfb3 -> 0x3fd0cfb3)
FLEX: Phase A Data corruption - Unable to fix errors.
FLEX: Garbled message at block 3
FLEX: Phase B Data corruption - Unable to fix errors.
FLEX: Garbled message at block 0
FLEX: State: SYNC1
FLEX: SyncInfoWord: sync_code=0xb068 baud=1600 levels=4 polarity=NEG zero=0.034264 envelope=0.124727 symrate=1600.037794
FLEX: State: FIW
FLEX: FrameInfoWord: cycleno=08 frameno=118 fix3=0x00 time=35:41 offset=0.00:00:02
FLEX: State: SYNC2
FLEX: State: DATA
FLEX: Phase A Fixed 2 errors @ 0x00020004  (0x6bc04c0f -> 0x6bc24c0b)
FLEX: Phase A Fixed 2 errors @ 0x02000008  (0x7ec2dd2b -> 0x7cc2dd23)
FLEX: Phase A Data corruption - Unable to fix errors.
FLEX: Garbled message at block 2
FLEX: Phase B Fixed 2 errors @ 0x20100000  (0x1f701402 -> 0x3f601402)
FLEX: Phase B Data corruption - Unable to fix errors.
FLEX: Garbled message at block 1