The BRATS hosted 164 Cub and Boy Scouts and family members aboard the Nuclear Ship Savannah in Baltimore Harbor for the 2014 edition of the Jamboree on the Air. Scouts, parents, and our volunteers had a blast as we shared several aspects of ham radio, from chasing DX to experimenting with software defined radio.
Scouts make contacts with our two HF stations in the Veranda aboard the Nuclear Ship Savannah
We would like to thank all of the volunteers for their time and support this Saturday, including Walt Mathers, who planted the seeds for hosting aboard the NS Savannah, then walked miles of decks and climbed hundreds of ladders leading tours for the Scouts and their families, Cliff KB3VQU of the NS Savannah ARC for his assistance organizing, setting up antennas, and training our volunteers, Matthew, Shane K2GZL, our prolific CQers Mark W3MSR and Steve KA3ZMN, Johnel, Lizard N3GXH, and Oryx K0ryx.
Mark your calendar for JOTA 2015 — October 16, 17, 18!
Walt leading Pack 307 on a tour of the NS Savannah
For this weekend’s public service event, the BRATS hope to use an alternative to the trailer tower and operate a portable repeater “mobile maritime’ from the S/V Bay Retriever. The top of her mast sits 44′ above the water, providing a great platform for a repeater for the 18 mile walk around Kent Island.
Stand by for pictures of the setup and reports after the event!
It’s time to buckle down as we wind down JOTA preparations, and the BRATS will be returning to the Pikesville Library for the September meeting.
Monday, 9/8/14, at 7 pm at the Pikesville Library.
The Aug 11, 2014 meeting of the BRATS will be held at The Greene Turtle Owings Mills, Restaurant Park Drive South, Owings Mills, MD, United States.
Be sure to attend as we plan our September MS event and the October Jamboree on the Air!
Still in development, but it works!
The WB3DZO data repeater is now online and ready for normal amateur use. Come to the next meeting on Monday, May 12, at 7 pm at the Pikesville library to vote on a new name!
Channels are 5 MHz, with frequencies on 5870 on northern sectors, 5890 to the southeast, and 5910 to the southwest.
Until then, here’s where we expect coverage from a Nanobridge NB5-G25 ($90 dish) to our network:
The Baltimore Radio ATV Society invites all hams and technology enthusiasts to our next meeting on Monday, April 14, at 7 pm at the Pikesville Library in Reisterstown, MD.
The Brats have built a high speed digital backbone connecting 5 sites across 20 miles of Baltimore, replacing our aging analog repeater links with modern commercial wireless gear and in the process joining the forefront of a technological revolution.
Learn about our early trials, how we planned our network, how we selected our gear, why we spent hours a hundred feet above the ground on a frigid winter night – and why we can send 3 gigabytes of data in 300 seconds with wind gusts over 50.
Get an overview of the regulatory environment and concerns. What frequencies can we use? Is encryption allowed? How do we secure the network, and how do we ensure priority traffic gets through?
See how the Brats are currently using our network today, where we’re going tomorrow, and how the amateur radio community can leverage this technology in both everyday amateur use and emergency situations.
Tonight’s high winds provided a good opportunity to see how the network holds up. Result: the dishes definitely sway enough to affect signal (from +3 dB better than normal to -3 dB worse), but data rates have been consistent.
The following tests are end to end across two hops:
100,000 x 1024 byte pings in 329 seconds:
— ping statistics —
100000 packets transmitted, 99999 received, 0% packet loss, time 329014ms
rtt min/avg/max/mdev = 2.511/3.252/14.082/3.625 ms, pipe 18, ipg/ewma 3.290/2.847 ms
And iperf results:
[SUM] 0.0-300.1 sec 3.19 GBytes 91.3 Mbits/sec
Moving 3 gigaBYTES across two wireless hops a total of 13 miles in winds gusting to 50 in 300 seconds isn’t too shabby!