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[06:02] <SpacenearUS> New vehicle on the map: 03VE6AZX-14 - 12https://tracker.habhub.org/#!qm=All&q=VE6AZX-14
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[07:16] <SpacenearUS> New position from 03ICT3 after 0316 hours silence - 12https://tracker.habhub.org/#!qm=All&q=ICT3
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[09:37] <SpacenearUS> New vehicle on the map: 03Magnu_chase - 12https://tracker.habhub.org/#!qm=All&q=Magnu_chase
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[11:49] <SpacenearUS> New vehicle on the map: 03S52O-9_chase - 12https://tracker.habhub.org/#!qm=All&q=S52O-9_chase
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[12:23] <SpacenearUS> New vehicle on the map: 03Vk3lsg_chase - 12https://tracker.habhub.org/#!qm=All&q=Vk3lsg_chase
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[13:24] <SpacenearUS> New vehicle on the map: 03SOLAR-WL - 12https://tracker.habhub.org/#!qm=All&q=SOLAR-WL
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[16:13] <nickoe> PE2BZ: what firmware branch is the one that people uses for RS41?
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[16:38] <OZ1SKY_Brian> PE2BZ Hi Ben, are you around?
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[16:52] <OZ1SKY_Brian> did anyone here ever measure the harmonics of a rs41 running on 70cm ?
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[18:00] <PE2BZ> OZ1SKY_Brian, I am now !
[18:01] <PE2BZ> nickoe, that completely depends on you goals. RTTY, RTTY with APRS, RTTY with 4FSK, 4FSK only,
[18:01] <bertrik> oh, I didn't know 4FSK was used for balloon telemetry :)
[18:05] <PE2BZ> Stereo RTTY :-) Don´t tell Darkside I called it that.
[18:31] <PE2BZ> PE1MJA did measure the output filter seen from the capacitor on the output of the radiochip. Capacitor disconnected from the radio.
[18:31] <nickoe> I am not sure I see the point int RTTY
[18:31] <nickoe> there is no error correction
[18:31] <nickoe> as far as I understand
[18:32] <nickoe> I mean, I know it is on top of the data content, but RTTY isn't that usually 7bit ascii or something?
[18:32] <nickoe> or maybe even less bits
[18:32] <PE2BZ> So, for what purpose is no error correction a problem ?
[18:33] <nickoe> When receiving telemetry
[18:33] Action: PE2BZ is currently building another 7 gram rtty tracker....
[18:34] <PE2BZ> But with speeds from 50 to 300 baud no one cares about an error in the telemetry. which almost never happens at all receivers at the same moment.
[18:35] <nickoe> Well... I like no data or correct data.
[18:35] <PE2BZ> Incorrect data fails the checksum an is not part of the stored data.
[18:36] <nickoe> well, yeah, but if it is coded a bit there are room for bit or byte errors
[18:37] <nickoe> Anyway, that is why I don't like RTTY as a mode. I would probably rather do some "normal" byte wise FSK
[18:37] <nickoe> But for the DFM radio to work, I need to be able to proram the pll and I have not got there yet.
[18:37] <nickoe> *DFM09
[18:38] <PE2BZ> OZ1SKY_Brian, https://imgur.com/az0aBfO
[18:51] <OZ1SKY_Brian> Hi, back now
[18:52] <OZ1SKY_Brian> antenna sweep?
[18:53] <OZ1SKY_Brian> did you ever measure the harmonics on a rs41?
[18:53] <OZ1SKY_Brian> my spectrum is playing tricks on me, trying to do just that
[18:54] <OZ1SKY_Brian> looks to me about 16dBm carrier and harmonics at 864 and 1297 are down near -44dBm
[18:54] <PE2BZ> Not tried, but can test on the RSP1a. Is that with RTTY or original state ?
[18:54] <OZ1SKY_Brian> but would be nice to have another opinion
[18:55] <OZ1SKY_Brian> measure max hold on a cw carrier
[18:55] <OZ1SKY_Brian> but if you measure the rtty the difference should be the same in db or close to it
[18:55] <PE2BZ> I will give it a try this weekend.
[18:55] <OZ1SKY_Brian> just use one of the tones
[18:56] <OZ1SKY_Brian> great
[18:56] <OZ1SKY_Brian> checking to see if i need a filter or it will be good to go as a beacon
[18:56] <OZ1SKY_Brian> telecom agency will make the licens ready monday
[18:58] <PE2BZ> What´s the required harmonic suppression ?
[19:00] <OZ1SKY_Brian> ive been trying to find just that and failed. found both 40 and 50db, but not at any official sites
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[19:14] <PE2BZ> Above a certain frequency it´s no longer a minimum suppresion but a maximum level. At work we have an R&S analyzer, but I only get there next tuesday. You can not simply state that the suppresion is enough for Vaisala, who transmits with even more power ?
[19:16] <OZ1SKY_Brian> yeah since its going to run 24/7 at the site, i just wanted to check it, but for some reason is not easy to find the regulations here
[19:17] <OZ1SKY_Brian> just wanted to check if someone else also found it to be in the same range as i did
[19:18] <PE2BZ> Do you happen to have a firmware that outputs just one single carrier ?
[19:20] <OZ1SKY_Brian> no its cw id, i just use max hold
[19:20] <OZ1SKY_Brian> its made from rs41fox, the darkside fw
[19:21] <OZ1SKY_Brian> 5x on/off, callsign, locator
[19:21] <OZ1SKY_Brian> repeat :-)
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[20:05] <nickoe> PE2BZ: hmm, what freq is Brian talking about?
[20:12] <daveake> Expensive tracking ... https://www.bbc.com/news/world-europe-50180781
[20:15] <nickoe> heh
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[20:36] <Darkside> nickoe: look at my 4FSK mode
[20:36] <Darkside> that has FEC
[20:36] <nickoe> Darkside: Sounds, good, but where should I look?
[20:36] <nickoe> Anyone familiar with libopencm3?
[20:37] <Darkside> https://github.com/projecthorus/horusbinary
[20:37] <Darkside> in particular https://github.com/projecthorus/horusbinary#mfsk---horus-binary-packets
[20:38] <Darkside> for such short packets we find that the golay code is sufficient as FEC
[20:39] <nickoe> "If you are going to fly your own payload using this mode, you must get a payload ID allocated for your use. This can be done by submitting an issue or a pull request to this repository, or e-mailing me"
[20:39] <nickoe> What if just using ham callsign?
[20:39] <Darkside> the point there is the ID field is a single byte
[20:39] <Darkside> https://github.com/projecthorus/horusbinary/blob/master/payload_id_list.txt
[20:40] <nickoe> I am not too much into the different coding schems, I am just modly familiar with the aausat3+ packet.
[20:40] <Darkside> so to upload teleetry into habhub, the packet needs to be translated into something habitat can understand
[20:40] <Darkside> hence the ID to callsign lookup table
[20:41] <nickoe> ah
[20:41] <Darkside> eventually i am planning on changing the packet format a bit to allow for more in that field
[20:41] <nickoe> well, for now I am just trying to write some firmware and get the radio to _something_
[20:41] <Darkside> but... time
[20:42] <Darkside> which radio?
[20:42] <nickoe> The one on the DFM09
[20:42] <Darkside> oh ok
[20:42] <Darkside> i havent uncapped the can on the DFM09 i have
[20:42] <nickoe> I could not find any fw for it anywhere
[20:42] <Darkside> what radio chip is in it?
[20:42] <nickoe> there is a MB15E03SL PLL
[20:43] <Darkside> ahh
[20:43] <Darkside> whats the minimum frequency step?
[20:43] <Darkside> thats going to be your limiting factor in using RTTY / MFSK mods
[20:43] <nickoe> so I need to give it a ref clock of 5.125 MHz and then write to two registers and it should be on 403.770 MHz. At least that is my goal as a start
[20:44] <Darkside> well
[20:44] <Darkside> hmm
[20:44] <Darkside> how is it modulated?
[20:44] <nickoe> there is a seperate pin to do the modulation
[20:44] <Darkside> analog input? or just digital
[20:44] <nickoe> analog
[20:44] <Darkside> oh so its pulling a crystal?
[20:44] <nickoe> I think I will just upload my references
[20:45] <nickoe> mmm, not even a crystal, just a tank circuit with a capdiode
[20:45] <Darkside> ok so if you have decent control over that analog input, and its not just a digital IO pin from the micro, then you could do more than just 2FSK
[20:48] <nickoe> It is on a DAC pin
[20:49] <nickoe> seemingly 2vpp was used in the original fw
[20:50] <nickoe> Darkside: Some notes, https://github.com/nickoe/dfm09_hacking
[20:50] <nickoe> Darkside: RF https://github.com/nickoe/dfm09_hacking/blob/master/eevblog/02-radio-pll.png
[20:51] <bertrik> if you can do 18-fsk with a specific spacing, you can do dominoex :)
[20:56] <Darkside> yeah but dominoex is sloooow :P
[20:57] <Darkside> hmm 2Vp-p for a few khz frequency spacing.
[20:57] <Darkside> you'll need to lower that a lot to be able to do narrowband mods
[20:58] <nickoe> I am not sure what the deviation is for that
[20:59] <Darkside> 'small'
[20:59] <Darkside> like, a few hundred Hz
[20:59] <Darkside> small enough to fit within the passband of a
[20:59] <Darkside> of a 'regular' SSB receiver i mean
[21:00] <Darkside> realistically for FSK the tone spacing doesnt need to be any wider than the symbol rate
[21:04] <nickoe> yeah
[21:05] <Darkside> for the 4FSK mode, i'm limited by the minimum resolution on the RS41s TX chip (the Si4032)
[21:05] <Darkside> so its wider than it needs to be
[21:05] <Darkside> still narrow enough though
[21:07] <Darkside> the modem on the RX side is very tolerant of the spacing, so getting it exact is not critical
[21:07] <nickoe> yeah
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[23:29] <SpacenearUS> New vehicle on the map: 03KD2E-12 - 12https://tracker.habhub.org/#!qm=All&q=KD2E-12
[00:00] --- Sat Oct 26 2019