San Francisco Radio Club

May Meeting at the Jeremiah O'Brien

5/13/2025

This month's meeting will be at another new location just for this month. We'll be on the Jeremiah O'Brien at Pier 35 along the Embarcadero @ North Point at 7pm on May 16th. It is not ADA accessible but our meeting will be hybrid as usual so please do tune in.

Google Meet Video call link: https://meet.google.com/uko-uspw-yqi

Next month we will be back at the Randall Museum.

5/16, 7pm, Club Meeting Presentation - F2 Layer Mapping App

In Hamilton Carter's (KD0FNR) words:

Hamie (KO6BTY) and I have been playing with mapping our QSOs for a few years now. We evolved from ionosonde data and Google Earth to data from an NOAA model called GloTEC, (Global Total Electron Content), and Cesium Ion maps. Out of that, we have an app up and running that provides half hour in the past global values for hmF2, (height of the F2 layer at the maximum electron density), foF2, (the frequency a vertical signal will still be reflected back at), and mufd (3000km), (the maximum usable frequency for QSOs on F2 skip at 3,000 km. Hamie and I will talk about what led to the mapping system, how it evolved and was programmed, some of the people we've met and worked with in the NOAA and the Bay Area tech community.

For folks that would like to see the app before the meeting, it can be found at https://copaseticflow.blogspot.com/p/project-toucans-current-f2-map.html

The code is at https://github.com/hcarter333/glotec_hm_fo_f2

This meeting will also be online.

Google Meet Video call link: https://meet.google.com/uko-uspw-yqi

April Club Meeting

4/14/2025

New Meeting Location - Randall Museum

As we continue to search for a regular meeting space for the club, this month we will be at the Randall Museum this Friday at 7pm. This museum was renovated and reopened in 2018. There is access to front entrance from the parking lot and surrounding streets. We'll be in the Randall Room on the upper level. There will be a security officer at the entrance who can guide folks where to go. There is ADA and elevator access.

SFRC President, Bruce Wolfe N6BMW, will be activating near the front entrance between 2pm and 2:30pm on Friday on the W6PW 2m repeater as well as HF.

https://randallmuseum.org/wp-content/uploads/randall-museum-map.pdf

Here's the bird's eye view: https://maps.app.goo.gl/hUT1grQsBxSwn7cTA

Here's a little closer showing entrance to parking lot: https://maps.app.goo.gl/r36VKj9gHTQc8g4W9

Walkable tour from the parking lot to the front entrance (click ahead in map to "walk") https://maps.app.goo.gl/GxVv1PPxXQGkGJVL9

This meeting will also be online.
Google Meet Video call link: https://meet.google.com/uko-uspw-yqi

Club Meeting Presentation

Kaitlyn KN6MAN, and her famous sidekick "Astrocat," will be presenting Building Your Own Ham Radio Using GNU Radio and an SDR.
Modern RF development largely moved away from a physical transistors and breadboards. Instead, a software defined radio (SDR) can make device prototyping as simple as drawing a diagram. Software defined radios have become so ubiquitous with RF development that the majority of radio-related chips today process data as if it were a single-purpose SDR. Let's make our own ham radios together in this beginner-friendly introduction to SDR development.

This meeting will also be online.
Google Meet Video call link: https://meet.google.com/uko-uspw-yqi

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