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A sat tracking program I have shows ISS passing almost directly overhead in about 40 minutes. How would the downlink frequency vary due to doppler shift as it t
by sizzzzlerz 6y ago
A sat tracking program I have shows ISS passing almost directly overhead in about 40 minutes. How would the downlink frequency vary due to doppler shift as it transits from local horizon to local horizon?
- oliveshell 6y agoGood question. Some info on tuning for Doppler shift: https://www.qsl.net/ah6rh/am-radio/spacecomm/doppler-and-the-iss.html https://www.qsl.net/ah6rh/am-radio/spacecomm/doppler-and-the...
- sizzzzlerz 6y agoThank you, that was very informative. Seems like the calculations are pretty straight forward. I need to see if I can create my own charts like that.
- nickysielicki 6y agoThe open source software gpredict can do this live for you.
- tomfanning 6y agoShort answer - by one or two of the smallest steps on a typical handheld, starting above the nominal frequency and ending below it. A bit more than that for UHF downlinks.