highaltitude.log.20200501

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[00:58] <Darkside> DL7AD: you should have a go at sending the horus binary mode
[00:58] <Darkside> at 100 baud
[00:58] <Darkside> its surprisingly robust
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[01:13] <SpacenearUS> New vehicle on the map: 03AIRCOR-2 - 12https://tracker.habhub.org/#!qm=All&q=AIRCOR-2
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[04:16] <SpacenearUS> New position from 03W8MV-11 after 0313 hours silence - 12https://tracker.habhub.org/#!qm=All&q=W8MV-11
[04:36] <SpacenearUS> New position from 03U4B-2 after 036 days silence - 12https://tracker.habhub.org/#!qm=All&q=U4B-2
[04:47] <SpacenearUS> New position from 03PS-76 after 0314 hours silence - 12https://tracker.habhub.org/#!qm=All&q=PS-76
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[07:29] <SpacenearUS> New position from 03YO3ICT-PITS after 0317 hours silence - 12https://tracker.habhub.org/#!qm=All&q=YO3ICT-PITS
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[09:29] <SpacenearUS> New position from 03NASD01 after 0317 hours silence - 12https://tracker.habhub.org/#!qm=All&q=NASD01
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[10:24] <SpacenearUS> New position from 03PS-74 after 0315 hours silence - 12https://tracker.habhub.org/#!qm=All&q=PS-74
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[11:00] <SpacenearUS> New position from 03U4B-6 after 0319 hours silence - 12https://tracker.habhub.org/#!qm=All&q=U4B-6
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[11:35] <DL7AD> Darkside: okay. I will test it. But I have some questions before I'm gonna implement it.
[11:36] <DL7AD> Darkside: Was that 2FSK? Could you send me a sample bitstream which I can slap into my code for testing? How am I'm gonna receive it?
[11:37] <Darkside> DL7AD: 4FSK
[11:37] <DL7AD> Darkside: I'm not entirely sure, but I failed doing 4FSK with Olivia.
[11:38] <Darkside> https://github.com/projecthorus/horusbinary
[11:38] <Darkside> the horus binary modem is very tolerant of frequency offsets
[11:39] <DL7AD> you mean drifting
[11:42] <Darkside> both drifting and spacing between tones
[11:46] Nick change: Kodar_ -> Kodar
[11:55] <Pit[m]> people getting crazy and cutting cellphone tower cables
[12:01] <PE2BZ> Pit[m], just cutting cables ? Over here they tend to make towering inferno´s ....
[12:20] <SpacenearUS> New vehicle on the map: 03F5APQ_chase - 12https://tracker.habhub.org/#!qm=All&q=F5APQ_chase
[12:20] <DL7AD> Darkside: I will try it out later because it will take me a lot of time getting it working on the tracker. If you would have sample symbols, I could try to transmit on the tracker, I'd be pleased.
[12:24] <Darkside> DL7AD: yeah maybe
[12:25] <Darkside> would a bitstream do perhaps?
[12:25] <Darkside> you can convert that to symbols easily enough
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[12:32] <DL7AD> Darkside: yes
[12:32] <Darkside> just generating some hex
[12:34] <Darkside> 2424406F302C041DC549D336EDCECD9454EF5F2CA055FA1C5A81F9A30379D0F2D0431C31C9D456DF7ED8205A98
[12:35] <OZ1SKY_Brian> GA guys
[12:36] <Darkside> DL7AD: just trying to remember if the bytes are sent low nibble first of high-nibble first
[12:36] <Darkside> (nibble being 2 bits)
[12:37] <DL7AD> I can try that out
[12:37] <Darkside> https://github.com/darksidelemm/RS41HUP/blob/master/mfsk.c#L4
[12:38] <Darkside> transmit at 100 baud 4FSK, tone spacing ~250 Hz or so works best.
[12:40] <Darkside> oh, and transmit some runs of 0x1B before sending the packet (basically idle tones), which helps the modems estimators sync up before the packet starts
[12:40] <DL7AD> Darkside: ok
[12:41] <Darkside> https://github.com/projecthorus/horusbinary/wiki/2---Modem-Details
[12:41] <Darkside> the unique word (0x2424) is already included in the hex packet i pasted in
[12:42] <Darkside> i guess it would be good to just test out how the modem works via the QO-100 channel before going too far
[12:43] <Darkside> can you send SSB through QO-100?
[12:43] <DL7AD> Yes I could theoretically. But I haven't set up things quite yet.
[12:44] <DL7AD> I don't have the antenna yet.
[12:45] <DL7AD> I have a 11dBi Yagi for 2.4GHz but no antenna for 10.5GHz
[12:45] <Darkside> could receive using the websdr
[12:45] <DL7AD> yes that's what I'm doing at the moment.
[12:46] <DL7AD> Another downside is, that I have to go into the stairwell because I have no window looking to Eshail :P
[12:46] <DL7AD> So very inconvenient.
[12:47] <Darkside> rfhead.net/temp/horusbinary_test.wav
[12:47] <Darkside> basically you could try sending that through QO-100 and tryind to decode it
[12:47] <Darkside> see how it work with different transmit powers
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[12:47] <Darkside> that will at least tell you if the modem is going to work via the sat
[12:48] <Darkside> at the power level you are thinking of using
[12:48] <DL7AD> I aim for 100mW. (if that is possible)
[12:49] <Darkside> all depends on the resultant SNR...
[12:50] <Darkside> and i dont know what that woudl be
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[13:15] <SpacenearUS> New position from 03BSS25 after 03a day silence - 12https://tracker.habhub.org/#!qm=All&q=BSS25
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[13:51] <craag> From some pre-launch qo100 numbers I have: 100mW input and a 3dB patch on uplink, you're looking at approx -10dB C/N in 1KHz BW in the downlink.
[13:51] <Darkside> hrm
[13:51] <craag> However those numbers were pessimistic, but I can't find anything of anyone measuring the G/T.
[13:52] <Darkside> that probably wouldnt be enough for the 100 baud horus binary mode
[13:52] <Darkside> the new modes would be ok
[13:52] <Darkside> i think they come out to around -20 dB C/N in 3 kHz
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[14:43] <Pit[m]> PE2BZ
[14:44] Action: Pit[m] uploaded a video: 5g.mp4 (11855KB) < https://matrix.org/_matrix/media/r0/download/matrix.org/pTfipyYNnayJcXEcflosZnFU >
[14:45] <Pit[m]> Cables should be in metal pipes.
[14:47] <PE2BZ> Morons....
[14:48] <PE2BZ> Metal pipe should be used for something completely different... (offtopic I know)
[14:49] <chris_99> eek, what are they cutting?
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[17:17] <Pit[m]> could be Heliax cable, idk
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[18:07] <SpacenearUS> New position from 03V4 after 0312 days silence - 12https://tracker.habhub.org/#!qm=All&q=V4
[18:07] <SpacenearUS> New vehicle on the map: 03XX - 12https://tracker.habhub.org/#!qm=All&q=XX
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[19:23] <SpacenearUS> New vehicle on the map: 03KN6EQU-1 - 12https://tracker.habhub.org/#!qm=All&q=KN6EQU-1
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[00:00] --- Sat May 2 2020