Παρασκευή, 14 Απριλίου 2017

How to work FM satellites

Simon 2E0HTS has released a video that shows him making contacts via the amateur radio satellite SO-50.
This satellite carries an FM transponder that receives signals on 145.850 MHz and retransmits them on 436.800 MHz (+/- 9 kHz Doppler shift). Operation is a little more complex that some other satellites since the transponder needs to initially be activated by a CTCSS (PL) tone of 74.4 Hz which starts a 10 minute timer and then a 67 Hz tone is used for the contact.
Note: If your radio has selectable FM filters use the wider filter designed for 5 kHz deviation FM which is sometimes referred to as a 25 kHz channel spacing filter.

 MORE: https://amsat-uk.org/beginners/how-to-work-fm-satellites/

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