HFU HF Underground
Technical Topics => The RF Workbench => Topic started by: Quinta on October 09, 2021, 1242 UTC
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(https://sun9-78.userapi.com/impf/M2eZaW10k5aJEabqpvncOtr15jmVT7goK8nsKA/bubpIb5-C94.jpg?size=1200x1600&quality=96&sign=50db86e393a896a3b62baaf3f7d21a90&type=album)
(https://sun9-83.userapi.com/impf/1Yo6XI0pBCXzDQWs1c4XC1I3BHqsYlCku6SCHw/IqnpLqtcv7A.jpg?size=1200x1600&quality=96&sign=2a83a9aef242cf0fe686f67c6f21911e&type=album)
(https://sun9-84.userapi.com/impf/GU1b0ox5CzYXoYr2JTT6xw70PQOpyrWA2fBqow/J_Qbno15J50.jpg?size=1600x1200&quality=96&sign=b587618814a1bcaaad082ec3c10a53db&type=album)
I made my first 4096 beacon :)
Arduino controlled. He checks voltage on PV, on lead-acid, if one of them higher than usable minimum (pv see the sun or acid battery higher than minimum voltage) he transmit message with voltages, temperature and EMI (little 2 stages hf amplifier with detector) and if pv voltage higher than battery, and battery not fully charged he turns on charging net. Then going to sleep for some 8sec cyles (maximum hibernation legth with lowpower library)
After every hybernation cycle he disconnect PV and acid battery for checking voltages, then, if PV voltage higher than acid, and acid voltage still not 6.7 v (i use 6v 4.5 a/h and 7.4v 0.5a PV) he turns on charging again.
Tx pixie-style, 0.5w output. 125ma current consumption, approx 1minute length transmission, 10wpm, then 10 minutes pause with dits every 8second. Also i remove power led from arduino pro. So it equals approx. 15ma current consumption.
Now i install beacon on the southern wall and test him with 50ohm load.
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Looks great! Can't wait to try and hear it :)
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He will be placed somewhere here
http://wikimapia.org/m/#lat=59.8349688&lon=31.2394464&z=14&l=1&m=b
So, in north america he can be received only with websdr.
Also i use plastik-71 on pcb, 3 layers. It much better than epoxy.
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He will be placed somewhere here
http://wikimapia.org/m/#lat=59.8349688&lon=31.2394464&z=14&l=1&m=b
So, in north america he can be received only with websdr.
Also i use plastik-71 on pcb, 3 layers. It much better than epoxy.
I'm still going to try to hear it here in the USA, I like DX challenges ;D
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I can install dipole from notrh to south. But not very high, 10-15 meters above ground, on the trees.
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Looks great and good luck. Спасибо!
+-RH
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I roll in the forest today between 13.00 and 19.10, trying to find thick pine with a clearing on the south, for lighting solar battery.
But lost in this game. Also in ths road a lot of people. I know one more appropriate place, tomorrow i will go there. https://wikimapia.org/#lang=ru&lat=59.787507&lon=31.245375&z=14&m=w
Now i charging acid of beacon from PSU.
I translate comments in beacon sketch to english, and download sketch to pastebin
https://pastebin.com/3C7amLMy
Some photos "Meanwhile in the forest"
(https://sun9-67.userapi.com/impf/iwOIkj09WT5DqV78IjdHI5Hc8leTMqffznuLlQ/-Nc5fQeMnzU.jpg?size=1200x1600&quality=96&sign=d87ab3f43085065f5618cb83621afc3f&type=album)
(https://sun9-60.userapi.com/impf/E1rPNDI3X4h96OBNp0w7_fF4jgoOgzDJ1Ok_og/9geso1kSyTU.jpg?size=1600x1200&quality=96&sign=58dc3a0a77cf5395665b20b8a8ecad51&type=album)
(https://sun9-38.userapi.com/impf/eAAvHaaUxRuVAHGMKVEz9dPvNHjKOOJu1KJhyw/voJG0XtGdSk.jpg?size=1200x1600&quality=96&sign=2ea4e8ed4003f7a322681c7ae8746800&type=album)
A sign at the site of a village destroyed in ww2, there are 10 of them within a radius of 15 kilometers
(https://sun9-30.userapi.com/impf/XsNFWYcOtOMJwv71dpPA2dpvPtSSo4ch69-nUA/WeEFaBV0zZc.jpg?size=1600x1200&quality=96&sign=bdb5173ca24276702e41a8a2eeb57257&type=album)
Some roads really ancient. 17хх year
(https://sun9-46.userapi.com/impf/Ajk_ne3UR1_sAzhOeJ2kR9fHhDPPtdn0Rg_9Kg/slMjQG3NbX0.jpg?size=2560x1707&quality=96&sign=aa3d06de2014242d35f6d6f8f3643835&type=album)
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Device installed
https://wikimapia.org/#lang=ru&lat=59.836042&lon=31.330669&z=17
Aaaand... i cannot hear it with my 8 meters random wire. But with ATS-20 and 20cm telescope i can hear it in the forest, 500m far from my home.
https://ibb.co/LnXQwr4
Antenna not tuned, i think i should made block with 2 stretchable tuning coils and install it between device and antenna.
https://ibb.co/g62CVkR
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http://hoshinokoe.ru/files/HF%20BEACONS/IMG_20220727_223630.jpg
I little bit obsessed with beacons :)
Two of them intalled here https://www.google.ru/maps/@59.8563053,31.3976757,1917m/data=!3m1!1e3
http://hoshinokoe.ru/files/HF%20BEACONS/beacons_map.jpg
Also i rework charging scheme, now if battery shorted or discharged scheme can't drop voltage and reset the controller
http://hoshinokoe.ru/files/HF%20BEACONS/modified_charge.jpg
Hmm, i can't insert image from my home server, so i insert the links.
Here i receive beacon with ATS-20
(https://sun9-52.userapi.com/impg/vupH-zljcy4y7sT9tfGwXLMJyWcrCdsO4YllXg/YAXVikveKeM.jpg?size=1600x1200&quality=95&sign=0434be27d586fe8f35a11e7b1584cc89&type=album)
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Looks like previous beacon is dead. I never heard it at home, his antenna was badly tuned, and looks like his solar panel see sun only half a day. So i made a new one. With L-network for working with endfed wire. Software much smarter. Attiny85 control everything. Masure voltages, if accumulator voltage lower than critical he try charge battery with 8% PWM to prevent reset controller when solar battery shorted by deep discharged accumulator. Also with telemetry after main message he transmit not very important information about beacon, six phrases, for example tranmitter power with one message, accumulator type with next message, in cycle. Antenna - 0.5 mm stainless wire.
And most important... i can hear it at home, on my WEBSDЯ, very weak, but better than nothing.
His marker - three dits with different length. 0.075, 0.1 and 0.15 secondswith pauses between dits 0.05 sec, marker period 3 sec. Transmission every 6 min.
http://hoshinokoe.ru:8073/#freq=4094553,mod=usb,secondary_mod=cwdecoder,sql=-150
later i try to tweak antenna performance.
(https://i.ibb.co/X8YCHpd/IMG-20230729-013629-339.jpg)
(https://i.ibb.co/nBkpkYF/IMG-20230729-213944-252.jpg)
https://ibb.co/KwKrn7Q
https://ibb.co/YXjgj1x