[DARARepeater] TNG - Thursday, December 18 - 3d printing for Christmas

[Mark Erbaugh]

TNG – Thursday, December 18, 2025

DARA Clubhouse, 6619 Bellefontaine Rd. Dayton, OH 45424.  The meeting begins around 7pm. 

By special request (George) and because no one came up with anything better, I will do a show and tell on my 3D printing for Christmas. The presentation will start around 7:30pm.



We are looking for presentations. If you have something you would like to share, please let me know. 


73,
de Mark, N8ME

License Exam Quiz #349

de Steve, AE8AT 

We have a diamond anniversary to celbrate in this week’s quiz. December 15, 1965 the Gemini-6 and Gemini-7 spacecraft rendezvous in orbit at 2:33pm EST. Gemini-6 was originally intended to redezvous with an unmanned target vehicle, however the launch of that target vehicle was not successful (i.e. explosion). Gemini-7 would also set a duration record of 330 hours, 35 minutes, and 1 second in space. These two missions accomplished major goals for the Gemini program: demonstrating the ability to rendezvous and maneuver spacecraft, and survive in space for a duration to travel to the moon and back. The Gemini spacecraft were equipped with VHF and UHF radios, and also a RADAR system. The collinsaerospacemuseum.org <http://collinsaerospacemuseum.org/> page indicates 406-549 MHz radio, 296.8 MHz radio, 15.016 MHz radio, S-band RADAR (2-4 GHz), and C-band RADAR (4-8 GHz). NASA webpages were also used as reference, including https://www.nasa.gov/history/55-years-ago-the-spirit-of-76-the-first-rendezvous-in-space/

T3C01 Why are simplex UHF signals rarely heard beyond their radio horizon?
A. They are too weak to go very far
B. FCC regulations prohibit them from going more than 50 miles
C. UHF signals are usually not propagated by the ionosphere
D. UHF signals are absorbed by the ionospheric D region

G3A07 At what point in the solar cycle does the 20-meter band usually support worldwide propagation during daylight hours?
A. At the summer solstice
B. Only at the maximum point
C. Only at the minimum point
D. At any point

E3B08 How does the maximum range of ground-wave propagation change when the signal frequency is increased?
A. It stays the same
B. It increases
C. It decreases
D. It peaks at roughly 8 MHz


Answers:
T3C01 = C
G3A07 = D
E3B08 = C


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