Discover and read the best of Twitter Threads about #amateurradio

Most recents (5)

I have questions about the last position and timing. The last raw APRS packet shows it here at 11:23:06 UTC. ImageImageImage
I guess I’m lost here! The APRS data has the last packet ~5 hours ago Feb 16th. The shoot down over Yukon was Feb 11th? The altitude shows 960.12m Image
Read 7 tweets
Bernd DL7APV asked me to QSP to the #AMSAT community that he will QRV this coming Thu, Sat, Sun and listen especially for #satellite setups. Use your chance to make your first ever #EME QSO - biggest challenge in #AmateurRadio 🌗

See how this can be done⬇️

#hamradio #moonbounce DL7APV and his EME antenna. Credit: DL7APV
Read 5 tweets
LNA / preamp is an unpopular topic of the portable SAT discourse. Noise figure (NF) is assumed to be low due to absence of long cables. But what if NF of the system inherently is not top tier? Any benefit in using LNA with FT-817 & FT-818? 🧵
#hamradio #amsat #amateurradio #hamr ImageImageImage
NF & MDS are determined by the quality of the signal chain and the venerable FT-818 is not a star in that department. Under exact same conditions (antenna, cable etc) a very weak signal readable from IC9700 would not be copyable from FT-818. 2/7
#hamradio #amsat #hamr Image
The comparison of NF & MDS of IC705, IC9700 and FT-818 assumes favourable IMD performance of the FT-818 with a 500 Hz filter. In the field this is rarely true and even less so with a passband of 3 or 2.7 kHz in SSB. 3/7
#hamradio #amsat #amateurradio #hamr Image
Read 8 tweets
When operating SAT-portable, the automatic Doppler correction of 2xFT-818 can be conveniently performed by a #RaspberryPi Zero W running #Gpredict and #Hamlib. Proven solid and reliable in DXing over the last 2 years. Read on for details 🧵

#amsat #hamradio #amateurradio #hamr
Doppler adjustment can be made manually but beyond calling CQ things get cumbersome. An automated tracking allows to quickly hop between different stations in the very limited time of the pass. For DX skeds this setup brings you spot on on the transponder frequency. 2/8 #amsat
RasPi connects to the WiFi hotspot of my iPhone enabling control and time sync. RTCZero backs up the system time. 2x CH340 USB-TTL converters connect the FT-818s to the Pi through Zero4U hub. 3/8
#amsat #hamradio #amateurradio #hamr #raspberrypi
Read 8 tweets
Gonna work some birds this weekend! 📡 🛰 @arrl #FieldDay #CQCQCQ NG6F @arrowantenna Image
#fieldday2020 equipment check. NG6F, 1B LAX Image
Welp, that’s a wrap for #AmateurRadio #fieldday2020. I didn’t end up working sats or digital at all. Instead made a last minute decision to deploy to the hills above @RoseBowlStadium, and worked all of SoCal on 2m/70cm with my partner, Apollo, dupe-checking. 🐾 Such a gooboy! ImageImageImageImage
Read 4 tweets

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