vhfwxsatellitetips-hw
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| vhfwxsatellitetips-hw [2021/08/01 23:59] – Changed title and added radio section mm3iig | vhfwxsatellitetips-hw [2021/08/14 18:14] – [Hardware Overview] mm3iig | ||
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| + | [[vhfwxsatellitetips|Front Page]] | [[vhfwxsatellitetips-antenna|Antennas]] | [[vhfwxsatellitetips-hw|Hardware]] | [[vhfsatellite-sw|Software]] | [[vhfsatellite-general|General Tips]] | [[vhfsatellite-gallery|Gallery]] | ||
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| ====== Hardware Overview ====== | ====== Hardware Overview ====== | ||
| ===== Radios ===== | ===== Radios ===== | ||
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| + | It is entirely possible to do this with just an RTL-SDR dongle and nothing else. You may struggle with LRPT a bit, but APT is a doddle. Sometimes the dongles are a little lacking in gain for LRPT unless it’s a really good pass. | ||
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| + | Moving up to a better, more sensitive SDR with higher bit resolution would definitely help. The Airspy kit looks good, MM3IIG and M7SMU swear by their RSP1As which seem to do a better job of picking the weaker low-angle signals out of the noise than the dongles with their poor front ends. | ||
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| + | If you’ve got a hardware receiver that can do this then great! Especially if you’ve got CAT control for Doppler. Beyond the scope of this guide, though. | ||
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| + | And finally remember: you can’t do this with a handheld and out to an audio jack as the 25 kHz bandwidth won’t be wide enough for even APT. MM3IIG tried it, and got a discernible image but without all of the required information for enhancements and using the full sensor data. | ||
| ===== Low Noise Amplifiers ===== | ===== Low Noise Amplifiers ===== | ||
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| This also applies to those weaker signals at lower angles (for both APT and LRPT). Sometimes you’ll want the gain up to help and that lets the intermod in. Filtering before gaining up will mean your radios front end won’t have as many issues with other signals interfering. | This also applies to those weaker signals at lower angles (for both APT and LRPT). Sometimes you’ll want the gain up to help and that lets the intermod in. Filtering before gaining up will mean your radios front end won’t have as many issues with other signals interfering. | ||
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| + | Here's a good resource on making a filter with the kind of materials you may have lying around (standard capacitor values, etc): https:// | ||
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| + | You may well decide that a certain signal is so powerful that you want to use a notch filter to remove it instead, of course. | ||
vhfwxsatellitetips-hw.txt · Last modified: 2021/08/14 23:43 by mm3iig