The special Doppler shifting uplink software is highly recommended, but is not absolutely required. On high elevation passes when the satellite is coming directly at you then the approaching Doppler *change* will be minimal, and also the change will be minimal as it leaves you. That gives a few minutes for others to see you with little Doppler.
But your *change* in Doppler will be highest in the middle of your pass, and no one will decode you then. (unless you are using the Doppler correcting uplink code). See http://aprs.org/psat.html
Bob, Wb4APR
-----Original Message----- From: AMSAT-BB amsat-bb-bounces@amsat.org On Behalf Of Nicholas Mahr KE8AKW Sent: Sunday, February 17, 2019 1:53 PM To: amsat-bb@amsat.org Subject: [amsat-bb] NO-84 Digipeater Online
Also forget to mention don't forget about the PSK31 Transponder also. It is always on 24/7 as it is the primary mission. It is very easily worked with just a simple 10m Dipole/Vertical and a directional 70 cm satellite antenna so mostly anyone should be able to work it. It downlinks on 435.350 FM and you uplink on 28.120 USB PSK31. You then use a program like FLdigi to decode the downlink as FLdigi has the ability to decode multiple PSK31 signals. Most importantly you must download a program called DopplerPSK as this is what you will be transmitting with. It automatically corrects the doppler on your uplink signal so others are able to decode your signal, otherwise it will just be a giant slant across the waterfall unable to be decoded. Currently there is only a small hand full of people working it. I would like to see more activity on it as it is good fun to work!
73 Nick KE8AKW _______________________________________________ Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb