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

[Bullfrog1201 at pm.me]

I have an issue that I was hoping someone might be able to help me with. I have an old APC/Schneider UPS that is causing me grief. It's a SMX 750. I just replaced the batteries. It woks fine as long as it has AC power. During my testing, I pulled the plug to test the runtime and the output voltage drops pretty significantly and starts fluctuating. It drops to around 90v and the run time on the LCD display starts fluctuating too.

I suspect it might have bad capacitors, but I haven't taken it apart to do a visual inspection to see if any of them are leaking or bulging. I got it from a government surplus auction several years ago. This could be the reason it was salvaged.

--
Jeremy Mayo
bullfrog1201 at pm.me

Sent with [Proton Mail](https://proton.me/mail/home) secure email.

On Wednesday, December 17th, 2025 at 9:13 AM, Mark Erbaugh <mark.election at gmail.com> wrote:

> 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.
>
> [Cover.jpeg]
>
> 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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