highaltitude.log.20211206

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[11:02] <SpacenearUS> New position from 03WB0URW-15 after 0319 hours silence - 12https://tracker.habhub.org/#!qm=All&q=WB0URW-15
[11:32] <SpacenearUS> New position from 03N4XWC-1 after 0311 hours silence - 12https://tracker.habhub.org/#!qm=All&q=N4XWC-1
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[15:20] <SpacenearUS> New position from 03KD2FOU-11 after 0314 hours silence - 12https://tracker.habhub.org/#!qm=All&q=KD2FOU-11
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[16:53] <SpacenearUS> New vehicle on the map: 03Sp6uuh_chase - 12https://tracker.habhub.org/#!qm=All&q=Sp6uuh_chase
[17:01] <SpacenearUS> New position from 03DG4NOB-10 after 032 days silence - 12https://tracker.habhub.org/#!qm=All&q=DG4NOB-10
[17:05] <SpacenearUS> New position from 03SA6BSS-7 after 033 days silence - 12https://tracker.habhub.org/#!qm=All&q=SA6BSS-7
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[17:40] <SpacenearUS> New vehicle on the map: 03Sp6qkm_chase - 12https://tracker.habhub.org/#!qm=All&q=Sp6qkm_chase
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[18:55] <chris_99> https://electronics360.globalspec.com/article/17494/bouncing-a-lora-message-off-the-moon 350W lora
[18:59] <chris_99> curious how the amplifcation actually works
[19:02] <LeoBodnar> jeezus f christ
[19:03] <chris_99> also is that legal heh?
[19:03] <LeoBodnar> the only thing worse is moon-bouncing APRS digipeater
[19:03] <chris_99> haha
[19:07] <MikeTango> https://en.wikipedia.org/wiki/Stockert_Radio_Telescope <-- use this
[19:08] <MikeTango> the largest, most powerful dish in amateur hands
[19:08] <LeoBodnar> what sort of sidelobes and leakage do these things have?
[19:09] <LeoBodnar> I can't imagine it would be anywhere close to legal limits (from above)
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[20:02] <dbrooke> chris_99: it's a bit light on details but I assume they mean 350W erp, so not really amplifying the RF from the chip but just lots of gain (on both transmit and receive) from the large dish
[20:03] <chris_99> ahh that's interesting, that's more impressive than i thought then, i was it might have been active amplification
[20:03] <chris_99> *i thought it
[20:35] <LeoBodnar> I don't buy it
[20:36] <LeoBodnar> LoRa sensitivity is about -140dBm, Tx power is about 10dBm so 150dB budget
[20:36] <LeoBodnar> EME losses around 800MHz would be, what, 270dB? http://www.parelectronics.com/pdf/web-eme.pdf
[20:38] <LeoBodnar> probably needs a cryo LNA and a kW TX
[20:42] <LeoBodnar> I have seen 40-50dBi figures for that size antennas so even 2 x 50dB still not making it w/o extra gain
[20:56] <SpacenearUS> New vehicle on the map: 03W3UAV-21 - 12https://tracker.habhub.org/#!qm=All&q=W3UAV-21
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[21:28] <dbrooke> it doesn't say what frequency but I'd assume they'd be operating under amateur rules rather than ISM to be legal, so probably 434 MHz which would have an antenna gain of around 40dB and would need 15.5dBm for the 350W which is plausible but still 267dB path loss so -172dBm rx signal
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[23:13] <SpacenearUS> New position from 03N4XWC-1 after 0310 hours silence - 12https://tracker.habhub.org/#!qm=All&q=N4XWC-1
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[00:00] --- Tue Dec 7 2021