October 5, 2023 Club Meeting

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Thursday, October 5, 2023 at 7:00 PM Medford Police Department Community Room, 219 S. Ivy St., Medford, OR

Program: To Be Announced

The program for October has not yet been announced. The club web page will be updated when the topics and speaker are known.

Announced in the October 2023 issue of The Repeater.

Meeting Notes

From the November 2023 issue of The Repeater.

RVARC Meeting Minutes 2023-10-05

7:04pm President Don Bennett, KG7BP, called the meeting to order. There were 24 attendees

Treasurer’s report: bank balance is $4694.34

Old business: Scott, NA7OM, asked if we could consider a roast for Mike, W6FFC, our recent life member. Bruce, KG7TUO, said Field Day pictures are on the CARE club website, carehamradio.com

New business: John, AC7S, called for Mike, W6FFC, to come up and John presented him with a plaque honoring his induction as a lifetime member. Scott, NA7OM, made a motion that the club reimburse the cost of the plaque, approx $81. Raoul, KG6DKA, seconded the motion. Voting commenced, motion passed unanimously.

Scott, NA7OM, reminded that payment of next years club dues are due, and announced that elections for club officers are to be held next month. We need more folks to stand for election. Offices are President, vice-president, treasurer, and secretary. Scott also made a motion to table new business, and move on with the program. Mike, W6FFC, seconded. Upon vote, the motion passed.

The next license exam will be held before the meeting next month, see Don Bennett, KG7BP, for more info. He would like to have exams on Saturday mornings, if a suitable venue could be found. If anyone has venue ideas, please contact Don.

7:33pm break for coffee, snacks, and visiting.

7:52pm Tom, N5EG, presented tonight’s program: The KA9Q-Radio Package. ka9q-radio is a command-line, multichannel software defined radio for Linux using IP multicasting so that multiple listeners can be using it at the same time. From Phil’s github page:

1. Efficient multichannel reception. A single Raspberry Pi 4 can simultaneously demodulate, in real time, every NBFM channel on a VHF/UHF band (i.e., several hundred) with plenty of real time left over. A mid-range x86 can handle the RX888 MkII at full sample rate (129.6 MHz), receiving multiple channels simultaneously on all LF/MF/HF ham bands (or anything else) plus 6 meters.

2. All I/O (both signal and control/status) uses IP multicasting. This makes it easy for more than one module, on the same computer or on a LAN, to operate on the outputs of other modules, or for individual modules to be restarted without restarting everything else.

From the sdrutah.org webpage: Using a USB3-connected RX-888 Mk2 receiver, long-term testing at nearly 130 megasamples/second has been done with good results. Esing a single 1 Gigabit Ethernet somewhere around 50 megasamples/second of 16 bit data may be acquired.

Tom has his presentation slide deck available upon request ([email protected]).

References:

• github.com/ka9q/ka9q-radio
• https://files.tapr.org/tech_docs/DCCpapers/DCC2021s pages 41 - 53.pdf (note: spaces in the filename)
• www.sdrutah.org/info/using_ka9q_radio.html
• www.ka9q.net
• www.youtube.com/watch?v=7nhBFSGby2o

8:55pm end presentation and meeting adjourned.