About 73

F1JKJ - Dij, 21/04/2016 - 12:58

“So what does Professor Ono think of seventy-three? “I really like the number seventy-three,” he said. “It is the sixth ‘emirp.’ ” An emirp, he explained, is a prime number that remains prime when its digits are reversed. (Emirp, of course, is “prime” spelled backward.) “Seventy-three and thirty-seven are both prime, so both are emirps.” In an episode of “The Big Bang Theory,” the character Sheldon Lee Cooper says that this is one of several properties that make seventy-three “the best number.” As for the other properties: “It is the twenty-first prime number. Its mirror, thirty-seven, is the twelfth. And its mirror, twenty-one, is the product of multiplying—hang onto your hats—seven and three.” He goes on to add, “In binary, seventy-three is a palindrome: 1001001.”

Seventy-three is also, it turns out, a star number (meaning it can be plotted on a centered hexagram, or Chinese checkers board), the largest minimal primitive root in the first hundred thousand primes (you can find an explanation for that one elsewhere online, if you must), and the smallest number with twelve letters in its name when it’s spelled out. To mathematicians, like Ono, it is more interesting than the average integer.

Seventy-three is also the number of books in the Catholic Bible and the titular number of one of Shakespeare’s most famous sonnets, about old age, which concludes: “This thou perceiv’st, which makes thy love more strong / To love that well which thou must leave ere long.” Perhaps more important to the young people of today, it is the atomic number of tantalum, a rare chemical element used in mobile phones that was named after Tantalus, an antihero in Greek mythology, who suffered hunger and thirst for eternity.”

Golden State and the Mathematical Magic of Seventy-Three

Categories: fr

Activation F5MCC 21 avril

URC News - Dc, 20/04/2016 - 18:10
Jeudi 21 avril 2016, en compagnie d’Yveline, F 13049, nous serons F5MCC/p sur : Références
  • DFCF 89432, Château de Mormont à cp 89000 St Maurice le Vieil (New One).
  • DLF 89186, Lavoir de Mormont (New One).
  • DCPF 89 CA 018, Pigeonnier du 1, Route d’Auxerre, (New One).
  • DCPF 89 PT 057, Pigeonnier du 9, Route d’Auxerre, (New One).
  • DCPF 89 CA 019, Pigeonnier du 5, Rue aux Puces, (New One).
  • DCPF 89 CA 020, Pigeonnier du Chemin du Cormier Rosier, (New One).
Heures, fréquences et modes :
  • ± 04h00 TU à ± 06h45 TU, ± 3,750 MHz en A1a et J3e.
  • ± 07h15 TU à ± 08h00 TU, ± 7,008 MHz en A1a.
  • ± 08h00 TU à ± 09h45 TU, ± 7,089 MHz en A1a et J3e.

Au plaisir de vous contacter toutes et tous demain matin, jeudi 21 avril 2016.

73’s – Jim – F5MCC.
Categories: fr

PIXIE 2 et LM386

URC News - Dc, 20/04/2016 - 10:46

Article de synthèse sur la construction OM d’un transceiver CW très simplifié dans une boite de cachous, et l’utilisation d’un LM386 qui peut faire office d’amplificateur BF sélectif ( bande passante de 500Hz) avec l’adjonction de quelques composants supplémentaires.

Lire la suite…….. Copyright secured by Digiprove © 2016 URC Union des radioclubs
Categories: fr

Contact ARISS 18 avril 16h56

URC News - Dll, 18/04/2016 - 14:00

Le collège St Richards de Bexhill on Sea au Royaume Unis a rendez vous avec ISS le lundi 18 avril à 14h56 UTC, soit 16h56 locales et 15h56 heure anglaise. C’est un contact direct entre Timothy Peake KG5BVI et GB4SRC. Il sera audible en Europe sur 145.800 MHz en FM bande étroite.

Liste des questions

  • 1. (Lucy – Year 9) – You have mentioned in an earlier call that you have been sleeping very well on the Space Station. Is that still the case or have you found any cumulative effects after four months in space ?
  • 2. (Aeden – Year 10) – As the ISS hosts astronauts from many different nationalities, what public holidays do the crew observe, if any, and how are they chosen?
  • 3. (Anna – Year 11) – St Richards and two of our Primary Project Partner school, Dallington and Vinehall are taking part in the RHS ‘Rocket Science’ Experiment from the Principia Mission. How will the results from this experiment influence future planning for growing similar samples in another planet’s gravity?
  • 4. (Andrew – Year 11) – We have seen the preparation with Heston Blumental of an exciting astronaut menu for the mission – does the food taste the same in space as it did on Earth?
  • 5. (Shona – Year 11) – In a sealed spacecraft like the International Space Station, how is the air quality monitored and controlled?
  • 6. (Luigi – Year 11) – We see the wonderful time lapse images of the ISS orbiting the Earth, but what I like looking at are the stars and making out the constellations. Do you do any astronomical research on the ISS?
  • 7. (Moira – Year 11) – During the mission you yourself are part of experiments using the British designed MMS Cerebral and Cochlear Fluid Pressure Analyser to collect data for the NASA Fluid Shifts investigation. Which aspect of the self-experimentation has been the most interesting or challenging?
  • 8. (Chris – Year 9) – Are there any experiments that rely on naked flames on the ISS? If so, how are they carried out and what low gravity precautions are employed?
  • 9. (Ancy – Year 11) – If I oversleep my parents will wake me up – have you overslept on the ISS and had to be woken up by someone?”
  • 10. (Will – Year 10) – The distance between Bexhill and Brighton is 31 miles with a journey time by car of nearly 50 minutes. How much time would it take for the ISS to do this trip?
  • 11. (Vita – Year 11) – What are the greatest challenges of living in space and in retaining a permanent crew on board the ISS?
  • 12. (Max – Year 10) – You have tweeted some amazing and beautiful images of the aurora. Have you been able to monitor solar flare or CME activity and correlate to the brightness of the aurora?
  • 13. (Ben – Year 11) – How does it feel to be able to see all humanity?
  • 14. (Lucy – Year 9) – Is the ISS affected by the Earth’s magnetic field?
  • 15. (Aeden – Year 10) – On Sunday you will be joining thousands of others in taking part in the London Marathon. What special routines have you trained for this in space?
  • 16. (Anna – Year 11)) – In the London marathon, runners will have natural cooling as the run – how do you regulate your body temperature in a sealed environment such as the IS?.
  • 17. (Andrew – Year 11) – We understand you are taking part in the Skin B research on the ISS? Can you share any interesting findings?
  • 18. (Shona – Year 11) – You have tweeted that having a bacon sandwich and cup of tea on arrival at the ISS was the best welcome possible. What food are you looking forward to on landing?
  • 19. (Luigi – Year 11) – What is special about space suits that help you breathe in space when on an EVA?
  • 20. (Moira – Year 11) – How smooth was the launch in December?
Categories: fr

Concours de la semaine 2016-16

URC News - Dll, 18/04/2016 - 11:00

A lire sur le site de WA7BNM

+ Run for the Bacon QRP Contest 0100Z-0300Z, Apr 18 + 222 MHz Spring Sprint 1900 local – 2300 local, Apr 19 + Phone Fray 0230Z-0300Z, Apr 20 + CWops Mini-CWT Test 1300Z-1400Z, Apr 20 and
1900Z-2000Z, Apr 20 and
0300Z-0400Z, Apr 21 + RSGB 80m Club Championship, Data 1900Z-2030Z, Apr 21 + NCCC RTTY Sprint 0145Z-0215Z, Apr 22 + NCCC Sprint 0230Z-0300Z, Apr 22
Categories: fr

Activation de F5MCC 18 avril 2016

URC News - Dg, 17/04/2016 - 13:18
Lundi 18 avril 2016, en compagnie d’Yveline, F 13049, nous serons F5MCC/p sur : Références
  • DFCF 89362, Château du Trianon à cp 89210 Vénizy (réactivation) (le 02/04/2013 par F5MCC/p).
  • DMF 89135, Moulin d’En Bas (réactivation) (le 30/03/2013 par F5MCC/p).
  • DCPF 89 CA 016, Pigeonnier de l’Impasse des Chaumes, New One.
  • DLF 89184, Lavoir N° 1 de l’Hôpital, New One.
  • DLF 89185, Lavoir N° 2 de l’Hôpital, New One.
  • DFF 89 FT 022, Fontaine de l’Impasse des Chaumes, New One.
  • DFF 89 FT 025, Fontaine Diot, New One.
  • Locator de toutes ces références : JN18ua.
    • Altitude du DMF 89135 : 118 m.
    • Altitude de la DFF 89 FT 022 : 129 m.
    • Altitude de la DFF 89 FT 025 : 122 m.
  • Coordonnées des références ci-dessus :
    • DFCF 89362 : 48,03316 N / 3,70429 E
    • DMF 89135 : 48,03347 N / 3,70491 E.
    • DCPF 89 CA 016 : 48,03580 N / 3,71219 E
    • DLF 89184 : 48,03557 N / 3,70928 E.
    • DLF 89185 : 48,03539 N / 3,70859 E.
    • DFF 89 FT 022 : 48,04170 N / 3,70860 E.
    • DFF 89 FT 025 : 48,03614 N / 3,70539 E.
Heures, fréquences et modes :
  • ± 04h00 TU à ± 0​6h​45 TU, ± 3,750 MHz en A1a et J3e.
  • ± 07h​15 TU à ± 08h00 TU, ± 7,008 MHz en A1a.
  • ± 08h00 TU à ± 09h​45 TU, ± 7,089 MHz en A1a et J3e.
Categories: fr

425 DX News 2016-15

URC News - Dg, 17/04/2016 - 11:00

Categories: fr

DX de la semaine 2016-16

URC News - Dg, 17/04/2016 - 11:00

A voir sur le site AT communication

Date Participants Lieu 18 au 22 V85/OE9SBD Brunei 19 au 23 YD4IRS/5 Mansuar Island (Raja Ampat), Mentawai Islands, (IOTA OC-239), West Papua 19 au 23 YD4IRS/5 Mentawai Islands (IOTA OC-215) 20 au 25 RT92KA Alyumka Island (IOTA AS-092) 21 au 24 ZX5B Batuta Island 22 au 25 TK9C Corsica Island (IOTA EU – 014)
Categories: fr

Contact ISS 16 avril 18h19UTC

URC News - Ds, 16/04/2016 - 15:00

La station internationale ISS a rendez vous avec le festival de l’ingénérie de Washington DC le samedi 16 avril à 18h19 UTC (20h19 CEST) Le contact se fera en télébridge entre IK1SLD au nord de l’Italie et ISS, le contact sera donc audible en Europe sur 145.800 MHz

Liste des questions en anglais

1. Allen: What inspired you to become an astronaut?
2. Hailey: What kind of training did you receive to become an astronaut? What were the hardest parts of it?
3. Angela: What do you do in space when you are not working?
4. Sammy: How is sleeping in space different than sleeping in your bed? I read that you have to be strapped into your bunk during missions.
5. Joseph: When you get off a boat, sometimes your legs are really wobbly, does this happen when you come home from space? Do you have to readjust to the heaviness of gravity?
6. Zuriel: On Earth, we get regular check-ups to make sure we are healthy and fit for school or athletics. In space, do you monitor your health, like blood pressure? If so, are the machines that are used altered in any way for space flight?
7. Allen: We saw online that some of you are conducting research on headaches in space. Are headaches worse in space? Do people get more of them?
8. Hailey: Do you use 3D printing in space? We have heard that you can print parts to repair things that break.
9. Angela: Do things go wrong on the Space Station? What do you do to prevent that from happening?
10. Sammy: How does new technology modernize today’s space flight in comparison to early explorations? Does it change how data is collected, or allow for better quality photographs?
11. Joseph: How would you compare communication with your family compared to how Apollo astronauts communicated with their families? How has technology changed it?
12. Zuriel: What are some of the problems or challenges with space? travel for someone who is not physically fit? How does NASA ensure you are ready to go into space?
13. Allen: We have teams to work on our robots, solar cars, and other projects. How is being on the ISS like being on a team?
14. Hailey: Do the astronauts ever get mad at each other?
15. Angela: We love Space Movies! Which movies are most accurate? What parts are totally unrealistic in most movies?
16. Sammy: How long does it take to get to Mars and do you think there will be anyone living there, like astronauts or scientists, in our lifetime?
17. Joseph: What was the scariest thing that has happened to you while on the Space Station or while blasting off?
18. Zuriel: While flying over Washington DC, can you see any of the monuments?
19. Allen: When do you think the general public will be able to take a space trip? How soon do you think it might be a normal thing to do?
20. Hailey: What are some of your concerns for having untrained people fly into space?
21. Angela: Have you seen anything that makes you think there might be space aliens?
22. Sammy: How many days of supplies do you always keep in reserve?
23. Joseph: If there were a one way mission to Mars, would you try to be on that crew?
24. Zuriel: What did you do as a kid that helped you prepare to be an astronaut? Anything that you now can see was essential?

Categories: fr

Lighthouse 2016-16

URC News - Dv, 15/04/2016 - 11:01
Publié le 8 avril 2016 | Par F1PSH Calendrier de la semaine 16

Consulter le site de VA3RJ

  • 15/04-21/04 FH/F4FET: Mayotte Island WLOTA:0376 QSL H/c (d/B)
  • 15/04-30/04 HD2RRC: Isla de Puna WLOTA:1135 QSL R7AA (d)
  • 15/04-30/04 HC2GRC/P: Isla de Puna WLOTA:1135 QSL R7AA (d)
  • 15/04-30/04 HC5ZY/2/P: Isla de Puna WLOTA:1135 QSL R7AA (d)
  • 15/04-17/04 PS7DX/P: Touros Lighthouse WLOL:BRA-258 QSL ClubLog OQRS
  • 15/04-17/04 ZV2CO: Icapara DFB:SP-12 WLOL:BRA-135 QSL PY2DS (d/B)
  • 16/04-29/04 CE0Y/LU4DXU: Isla de Pascua WLOTA:0319 QSL H/c (d)
  • 16/04-24/04 VP5/KA3CNC: Providenciales WLOTA:2003 QSL H/c (d)/LoTW
  • 18/04-22/04 V85/OE9SBD: Brunei (main island) WLOTA:1628 QSL H/c (d/B)
  • 19/04-26/04 9Y/K2HVN: Tobago Island WLOTA:0412 QSL H/c (d/B)/NO LoTW
  • 19/04-24/04 DU1WQY: Luzon Island WLOTA:0081 QSL DF8DX (d/B)
  • 20/04-25/04 RT92KA: Ostrov Alyumka WLOTA:3190 QSL UA3AKO (d/B/OQRS)
  • 21/04-25/04 IA5J: Isola del Giglio WLOL:ITA-130 WLOTA:0564 QSL IU3BXI; OQRS
  • 22/04-25/04 TK9C: Corsica Island WLOTA:1390 QSL IK2AHB (B); ClubLog OQRS
Categories: fr

FT4JA, c’est fini

URC News - Dc, 13/04/2016 - 11:00

Le 11 avril 2016, les opérateurs de FT4JA quittaient l’île Juan de Nova au large à l’ouest de Madagascar après 105 000 QSO. Certains on pu contacter à de nombreuses reprises dans différents bandes et différents modes, d’autres une ou deux fois et certains pas du tout…

Une belle équipe soudée pour une belle expédition, toutes les infos sont sur le site de DX World

Categories: fr

Activation de F5MCC 13 avril 2016

URC News - Dm, 12/04/2016 - 22:40
Mercredi 13 avril 2016, en compagnie d’Yveline F 13049, nous serons F5MCC/p sur : Références
  • DFCF 89210**, le château de Vénizy à cp 89210** Vénizy, (réactivation).
  • DCPF 89 CA 016, Pigeonnier de la rue des Gouchots, New One.
  • DLF 89181, Lavoir de la rue du Four, New One.
  • DFF 89 FT 020, Fontaine du Parc du Château (DFCF 89210), New One.
  • DFF 89 FT 021, Fontaine rue du Vannage, New One.

** Je confirme DFCF 89210 et cp 89210 . . .


Locator de toutes ces références : JN18ua.

Coordonnées des références ci-dessus :

  • DFCF 89210 : 48,03439 N / 003,70711 E.
  • DLF 89181 : 48,03801 N / 003,71216 E.
  • DCPF 89 CA 016 : 48,033114 N / 003,707678 E.
  • DFF 89 FT 020 : 48,03398 N / 003,707305 E.
  • DFF 89 FT 021 : 48,035612 N / 003,711041 E.
Heures, fréquences et modes habituels, à savoir :
  • ± 04h15 TU à ± 0​6h​45 TU, ± 3,750 MHz en A1a et J3e.
  • ± 07h​15 TU à ± 08h00 TU, ± 7,015 MHz en A1a.
  • ± 08h00 TU à ± 09h​45 TU, ± 7,089 MHz en A1a et J3e.

Au plaisir de vous contacter, toutes et tous, YL et OM, en A1a et J3e sur 80 m. et 40 m.

Categories: fr


URC News - Dm, 12/04/2016 - 15:00

Au sommaire :
  • Réalisation d’un VFO synthétisé SI570
  • Présentation du QRSS, CW plus lente que lente…
  • Les dessous du D-STAR en France

Lire la suite…………


Copyright secured by Digiprove © 2016 URC Union des radioclubs
Categories: fr

Contact ARISS 12 avril 15h48

URC News - Dm, 12/04/2016 - 10:36

La station spatiale Internationale à rendez vous ce mardi 12 avril à 13h48 UTC avec l’université de Targoviste en Roumanie. Le contact se fera en direct et sera opéré par YO9INI et OR4ISS. Le contact sera audible en Europe sur 145.800 MHz et sera conduit en anglais.

L’évènement sera retransmis sur youtube

Liste des questions

1. Medeea (15): What are the qualities that define an astronaut?
2. Ana (16): What is the worst and the best part of your job?
3. Andreea (17): Have you ever felt the impact of space debris hitting the ISS?
4. Mihai (15): What was the most difficult test that you took during your astronaut training?
5. Catalin (12): What is an everyday thing which is extremely difficult on ISS?
6. Diana(17): What is the most beautiful thing that you can see from space?
7. Laurentiu (15): Have you ever observed solar radiation affecting ISS radio communications?
8. Mihai (15): Is radio communication a passion or a job obligation?
9. Alexandra(17): What is the most interesting discovery made on ISS using plasma?
10. Ioana (14): What’s the biggest difference between expectation and reality when living in space?
11. Radu (14): Has food the same taste in space?
12. Maria (13): What is the first thing you will be doing when you come back to Earth?
13. Alexandru (18): What is your most challenging task on the ISS?
14. Laura (17): How did your know you had a passion for exploration?
15. Mihnea (18): Do you think spaceflight will be accessible for the masses in the future?
16. Andra (15): Given the chance, would you live exclusively on Earth, or on the ISS?
17. Eusebiu (16): Has space travel changed your life?
18. Carla (17): Is it true that after coming back you shouldn’t expose yourself to sunlight?
19. Alexandra (16): What do you do in your free time?
20. Andrei (17): What is the coolest thing that you’ve done in microgravity?

Categories: fr

Présentation technique sigfox

Radio Club de Genève HB9G - Dll, 11/04/2016 - 18:36

Le jeudi 21 avril, devant un auditoire d'une trentaine de personnes, Thierry Vorms HB9FXO nous a présenté les bases de la techologie Sigfox, l'un des prétendants à devenir le réseau de l'"internet des objets" (IoT, Internet of Things).

L'application développée et présentée lors de la séance est un dispositif de mesure de poids de ruches, transmettant en quasi temps réel des informations vers une base de données accessible par un serveur web.

Les diapositives de sa présentation sont disponibles ici.


Categories: fr
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