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<div dir="ltr" data-setdir="false">A pass directly at you or directly away from you.</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">8 km second</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">800,000 cm/second/(3 cm) = 266000 cycles per second. Or 266 kHz</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">An overhead pass would be 266 kHz coming, 266 kHz leaving. or 500 KHz in round numbers.</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">LEO pass is typically about 5 min. or 300 seconds</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">500/300 or just under 2 kHz per second.</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">A lot of rounding and a lot of unknowns on orbit height, pass angles, etc.</div><div dir="ltr" data-setdir="false">but this should give you a starting point at worse case.</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">73 Kent WA5VJB<br></div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false"><br></div><div><br></div>
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On Monday, September 30, 2019, 5:13:55 PM CDT, Ron Economos via Ground-Station <ground-station@lists.openresearch.institute> wrote:
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<div><div dir="ltr">What magnitude of Doppler shift would be expected at 10.4 GHz? Total <br clear="none">shift, and more importantly, rate of shift.<br clear="none"><br clear="none">I've done some preliminary testing with a DVB-S2 receiver, and it can <br clear="none">handle 30 kHz/second no problem.<br clear="none"><br clear="none">Ron W6RZ<br clear="none"><div class="ydp61b12bedyqt5778622355" id="ydp61b12bedyqtfd80195"><br clear="none">On 9/29/19 09:32, Leffke, Zachary via Ground-Station wrote:<br clear="none">> Carrier/Beacon at 10G? atmega328 to handle CW IDing every so often? Obviously less operational ground stations, but might encourage the construction of 10G ground stations (Ku PLL LNB, bias-t, FCDPP or RTLSDR), which fuels the five/dime drive. Baby steps toward 10G amateur satellite spectrum use? Doppler at 10G from LEO should be fun. Antenna would be compact, maybe a patch on one side of a 4-layer board and components on the other....room for the solar cells?<br clear="none">><br clear="none">> This looks like the big brother of the Kicksats.....hardest part looks like power from the solar cells....2.2V @ 80mA according to their website. They do specifically say in their FAQs that you can't add another radio.....but sounds like they could be convinced.<br clear="none">><br clear="none">> Good stuff. I'd be interested in ANY beacon on ANY band, Doppler is fun.<br clear="none">><br clear="none">> -Zach, KJ4QLP<br clear="none">><br clear="none"><br clear="none"></div></div></div>
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