Discover and read the best of Twitter Threads about #hamradio

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Debido a las dudas, voy a hacer un hilo para aclarar algunas cosas sobre el uso de los famosos walkies chinos y sus derivados. ¿Qué son? ¿qué se puede hacer con ellos? ¿podemos hacer lo que nos de la gana solo porque “se venden en Internet”? ¿son “inhibidores”? Abro🧵#hamradio
Básicamente son walkies bibanda (VHF-UHF) de bajo coste y de fabricación china, destinados al mercado de la radioafición. Para usarlos en España -y en la mayoría de los países-, se requiere una autorización administrativa que necesita, entre otras cosas, que superes unos exámenes
NO, no son dispositivos de uso libre PMR como los que puedes adquirir en una gran superficie para ir de excursión (aunque los PMR son muy útiles). Los PMR deben cumplir con unos requisitos que estos aparatos NO cumplen en cuanto a potencias máximas y otras cuestiones técnicas.
Read 13 tweets
Recently, tens of #amsat ops made their 1st #moonbounce QSO. The thrill of #EME with a biggun creates an illusion of similarity to other modes. EME is different. How small a station you can hear? This thread elaborates on accurate predictions. No magic, only Physics! #hamradio
2/10 #EME is the only field in #hamradio that allows reliable predictions of station sizes that one can work. No smaller station beyond this prediction can be contacted under any conditions! You cannot bend the theory. The link budget can be expressed in Signal-to-Noise ratio-SNR
3/10 SNR represents the ratio of System Gain to Noise Temperature. #WSJTX in Q65 computes SNR in the bandwidth B=2500 Hz. That is the report that you exchange with each other. We want to maximise it by increasing the numerator and decreasing the denominator
#hamradio #moonbounce
Read 11 tweets
I always optimize space on my electronics and hardware security workbench by using small and portable tools.

Here are some that I use that didn’t exist a few years ago, and are much smaller and/or cheaper than their traditional alternatives;

FlipperZero is an open source portable multi-tool: NFC/RFID reader/emulator, IR transceiver, sub-GHZ transceiver (CC1101 based) , SPI/UART tool, and much more.
It can even function as a U2F token!
More info here:
TinySA Ultra: small spectrum analyzer with a 4" screen, covering 100 KHz to 6 GHz. Also works as a signal generator.
Read 15 tweets
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
This is a simplified guide describing a bare minimum (!) for #EME operation of WSJT-X in Q65-60B on 432 MHz. A few settings are TRX-specific. Consult to your rig's manual for those

Step 1: Download stable version of WSJT-X at

#amsat #moonbounce #hamradio
Step 2: Install WSJT-X and open Settings
1) Fill in "My Call" and "My Grid"
2) Tick "Enable VHF and Microwave submodes"
3) Tick "Decode after EME Delay"
Step 3: Navigate to Radio tab
1) Choose your rig model
2) Choose your serial port and baud rate
3) Choose CAT as PTT
4) Mode and split operation depends on your rig. A minimum non-destructive set: Non and Fake it, respectively
You test CAT by a button
Read 8 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
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
Radio amateurs #hamradio are participating @culturaljambori at #Moodbidri. #Hexbeam #antenna was set up today. @bsgnhq Image
Special event amateur radio station shall be on air from 21st to 27th December 2022. Call sign #AT22ICJ.
Read 6 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
DAY 6 HAARP Research Campaign Oct 2022 (Signal Capture Thread)
#HAARP #swl #hamradio #ConspiracyTheories #Radio #shortwave
Only HAARP signal capture I had in Oklahoma during Day 2 of Ghosts in the Air Glow was same as yesterday. Received 9.5 MHz during NBTV transmission, but nothing I'll be able to decode. Here's that signal start at scheduled time. #HAARP
Read 9 tweets
DAY 5 of HAARP Research Campaign Oct 2022. (Signal Capture Thread)
#HAARP #swl #hamradio #ConspiracyTheories #radio Image
Ghosts in the Air Glow ImageImage
The only HAARP transmission reception I can say I received in Oklahoma during Day 1 of Ghosts in the Air Glow, was the XIII (NBTV) on 9.5 MHz. It ended on time as scheduled. Here's a portion of video screen capture showing shut down. But my SDR recording was corrupt. #HAARP
Read 13 tweets
DAY 4 of HAARP Research Campaign Oct 2022 (Signal Capture Thread) #HAARP #hamradio #swl #ConspiracyTheories #radio Image
Two HAARP Transmission Experiments start today. (Day 4 #HAARP Signal Captures will be placed in this Thread) Image
Since announced HAARP frequencies for VLF Amplification experiment could change without notice as posted, I found one close to the 4.2 MHz they posted (4.240 MHz). Received this pulsing which shut down at scheduled end of experiment time. Unknown if #HAARP. NEED VERIFICATION
Read 4 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
#FirePreventionWeek on #hamradio - lots of fire department related/fire personnel on the air this week -- catch them on the air. Details at Image
You can get a certificate from one/all of the stations for contacting them via #hamradio Image
#FirePreventionWeek tip of the day from N6F on 10m (spinning around the band in between doing stuff at work!)
Read 4 tweets
#hamradio 10m open, just heard someone in Hawaii talking with someone in Puerto Rico!
E51JD Raratonga #hamradio
Raratonga is WAAYYY out there in the South Pacific Image
Read 5 tweets
#hamradio #SARNET amateur radio operator at an EOC in Florida SARNET saying they have 50 shelters, but not enough radio operators to staff them. SARNET has not yet been formally activated, but expected soon. #HurricaneIan
#HurricaneIan radio operator (earlier) said he had booked a hotel (farther inland) to ride out the hurricane, but they cancelled his reservation (closing because of the hurricane)... so he is going to just sleep in his truck.
#HurricaneIan #SARNET a different radio operator commenting that the ground is already saturated from rainfall, which is going to be a problem with so much more rain forecast.
Read 5 tweets
Apparently there are #hamradio amateurs who spend their weekends chasing down weather balloons. ImageImage
I wonder what the convergence of multiple weather balloons in Santa Maria is all about. ImageImage
Ah, nevermind, I answered my own question. Launched from Vandenberg.
Read 4 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
Exotic locale here at our #hamradio Field Day location...
Within distance of this spot...
Field Day Site
Read 5 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
I’ll offer a #hamradio DX tip. There is no one size fits all. From my experience I’ve found that Antenna, operator skill, radio, amplifier all matter, roughly in that order but not always. On the higher (easier) bands, having a good tx antenna matters most. /1
On the low bands that’s where things change. You find yourself using separate receive and transmit antennas on 80 and 160m. Your transmit antenna’s relevance to success suddenly drops down significantly. In fact you can make up for it with an amplifier. /2
Receive antennas make all the difference. As I explained on @ham_coffee using Beverages or a four Square greatly improves signal readability. At that point your S meter becomes completely irrelevant because your receive antennas actually attenuate signal to get better SNR. /3
Read 7 tweets
Durga Prasad Timsina had been languishing as an undertrial for 41 years at the Dum Dum Correctional Home in Kolkata but in the last two weeks, he got a new life. The Calcutta High Court ordered his release on March 17. Image
Timsina came back home to Nepal to meet his mother. The reunion was made possible by a prison inmate and some detective work done by a group of Ham radio operators in the two countries.
The 72-year-old Timsina was certified mentally unfit to stand trial for the murder that he was accused of.
Read 5 tweets
This email from the ARRL doesn't sit well with me. Every person that has ever talked to me about being interested in radio has asked me how to make contact with a family member hundreds of miles.

Every single #hamradio op is supposed to promote the hobby
Every one I know does
That said every ham I know puts emphasis on getting licensed.

Are we supposed to be suspicious of anyone that shows an interest in radio communications?

Are we now being asked to be gate keepers?

Are YouTube channels like @Hoshnasi going to be shut down?
That should be an absurd question. But in today's reality its not.
The #censorship is real and will never end if we allow it to continue.
I will always answer #hamradio questions for anyone who asks. People are scared from the state the world is in. Let's get more ppl licensed!
Read 4 tweets

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