Discover and read the best of Twitter Threads about #hamr

Most recents (8)

If you work via #GreenCube, try #EME with big guns. I promise, you will be amazed! As a proof of concept, I made a quick #moonbounce QSO with DL7APV with just a Yaesu FT-818, 40W, 1dB NF LNA and 15 el Diamond antenna held by hand! Easy QSO. Read on🧵
#amsat #io117 #hamradio #hamr Diamond A430S15 Yagi antennaEME QSO with DL7APV using 40W, Yaesu FT-818 and 15 el Yagi
2/9 There are a number of extremely capable #EME stations on 70cm: DL7APV, HB9Q, NC1I. If you are enjoying decode rates above 80% on #GreenCube, don't wait and try #EME. You will likely complete your first QSO over the Moon faster than on the congested #IO117
#amsat #hamradio Credit: HB9QCredit: DL7APVCredit: NC1I
3/9 I used my portable #Greencube set: Yaesu FT-818ND - 40W amp / 1dB NF preamp - Diamond A430S15 14.8dBi on wooden extension, held by hand and pointed visually. With a low NF frontend you can go with a 7el Arrow
#EME #amsat #hamradio #hamr #moonbounce
Read 10 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
Possibly HAARP beginning the moon bounce transmissions as scheduled at 1630 UT for Oct 2022 Research Campaign. Firing up transmitters just prior at around 9.6 Mhz as is reported. Short duration. Here's a snippet of capture. #HAARP @uafhaarp #hamradio #hamr #swl
Reference document #HAARP Image
#HAARP moon bounce Research Campaign transmissions via ionosphere reflection to Oklahoma. Snippet of capture.
Read 26 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
A local 12 year-old would sometimes bike through our neighborhood. One day he stopped me outside and asked what the antennas were for. I said, “I’m a ham radio operator. They’re for talking to other people.” 1/4 #HamRadio
He found me outside a couple months later and said he was reading about ham radio online — thought it was super cool. He was into computers as a hobby. I told him you could talk to the ISS with a ham radio and do various digital modes. You could see his excitement. 2/4 #HamRadio
Last weekend he knocked on my door. He was excited to tell me he got his Technician license. I asked what radio he bought. He said he wasn’t sure what he would get, he’d have to ask his parents for one, “maybe by next year I’ll have one on my birthday,” he said. 3/4 #HamRadio
Read 4 tweets
How portable can a #QO100 station be? Ultraportable, when running #FT8. No dish, <100 mW out (note the 3dB attenuator) and a 5000 mAh battery can power it for the whole day. 486 FT8 QSOs using this setup from JO89🇸🇪 so far. Few notes and thoughts
#amsat #hamradio #GHz_bands #hamr ImageImageImage
This is neither the most light-weight nor elegant setup, yet it takes less backpack space than my LEO gear (2xFT-818 & Arrow). The size can be further cut down if an SDR is used. I don't do #SOTA or #POTA but have not heard of anyone adopting similar approach in their activations
1) 13dBi RHCP cavity-backed patch antenna on TX (FPV drone racing antenna will do)
2) Bare, modified single LNB on RX
3) Primitive bias tee and high-pass filter to enable GPSDO input and IF out from LNB via one cable
4) DXPatrol upconverter
5) Leo Bodnar GPSDO
6) Cheap SDR dongle
Read 4 tweets
Leaving home and heading to London. #CyclingHz Image
Heading to London, the start of my charity ride to Edinburgh. The guy in the ticket office told me I won’t be able to bring my bike back on the Edinburgh train on Sunday the 15th. Hoping @LNER can help at KingsX Image
This little doodad enables you to quickly nip to the toilet and not worry about somebody wandering off with your bike. It also stops the bike falling over. #CyclingHz Image
Read 145 tweets
Tonight's #hamr hot-take: Your weekly nets are a goddamn waste of time if the only thing you're doing is giving your net control practice blindly reading a script and your members practice keying up the radio at the right moment and saying their callsign.
You should have two net control scripts: one that's a full script to reduce anxiety for first time net controls, and a second one that's a rough handwritten outline of all the topics they need to make sure to hit during the net.
Want to know a sure sign that a group is missing the point of a radio net and wasting everyone's time?

When they ask for check-ins, do they only ask for check-ins once, then move on with the rest of the script?

What about anyone they missed in the pileup? Do they not matter?
Read 4 tweets

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