50 MHz & Up Group

Group Logo

Home

The 50 MHz and Up Group is an educational and public service amateur radio organization centered in the San Francisco Bay area. The group is interested in developing and utilizing communications on frequencies from 50MHz up through light-waves. The group is open to any related topics that might be of interest to members, such as: technology, design, construction, operation, public service, contesting and antennas. Learn more . . .

Contact

For questions about this group or about programs and activities, please contact the 2018 President, Steve Shyvers (N6KLD):  steve.shyvers (at) gmail [dot] com

2018 dues and member information must be updated

If you do not have any changes at all in your contact information, then simply send an email with a sentance to Jeffrey Pawlan satating that nothing has changed. Please use jpawlan@yahoo.com
To send a memberform with your updated information or to join, please go to the Membership tab of this website.
Dues are $10 for a year, $15 for two years. This can be brought to a meeting or sent to the new Treasurer:
Oliver Barrett
1111 Pecos Way
Sunnyvale CA 94089

Make your check payable to 50MHz and Up Group of N. Calif Inc

May 2018 Meeting Announcement

Our meeting location has changed

We no longer have access to the TI meeting facilities for our 50MHz and Up Group.


Our next meeting of the 50MHz and Up Group of N. Calif will be on Tuesday, May. 1 beginning at 7:00pm. This is a different day of the week because of scheduling. Note that this meeting will be in a community room of the Sports Basement located at 1177 Kern Ave, Sunnyvale. This is off of Lawrence and approximately across from St Johns. The meeting which will begin at 7pm and we must exit the building at 9pm.

The agenda includes a talk by Tom Babut, SP5XMU, about VHF and microwave activity in Poland. Later there will be a roundtable discussion in addition to any announcements.

Minutes of the April 2018 meeting

Steve Shyvers (N6KLD) called the meeting to order at 7pm.
The meeting started with introductions, since there were a number of new attendees and guests.

Announcements:

MUD 2018 will be in Dayton, Ohio, October 11-14. For more information see http://www.microwaveupdate.org/
The East Bay Amateur Radio Club is looking for speakers. If interested, contact Martin Rothfield, W6MRR. The clubs web site is at www.ebarc.org
The GNU Radio Conference will be September 17-21 in Henderson, Nevada. For more information see https://www.gnuradio.org/grcon-2018/

Larry Zuckerman presented a talk on the EM (Electro-Magnetic) drive technology, its implications to the world of physics, and its problems.
Oliver Barrett presented the treasurers report. After some discussion and clarifications Art Lange moved that the report be approved, Mike Lavelle seconded the motion. The motion passed by a show of hands.
Jeffrey Pawlan gave a presentation on his effort to development a pair of new microwave transverter, particularly an E plane septum filter he is developing. The transverters are for the 5 and 10 GHz bands for use with the proposed AMSAT Geostationary satellite.
This was followed by a round table discussion of operating plans for the May SBMS 2 GHz and up contest. Five attendees indicated they were planning to operate in contest.

Discussion of the AD6FP Beacon and Translator issues.
Requires reset after AC power interruption
Linear translator performance degraded (correct?)
Proposed solutions
Purchase, install battery backup
Labor, engineering expertise, battery cost
Upgrade the Firmware to reset automatically
Labor, engineering expertise, cost impact unknown
Provide reset training to members (No cost)
This does not address the linear translator issues.
Recommendations:
Appoint committee to recommend course of action
Authorize a NTE expenditure
Other recommendations?
Mike Lavelle suggested that we measure the current performance, and decide what to do based on that information.
After a brief discussion Oliver Barrett was appointed to investigate these issues.

Brian Kline moved that the meeting be adjourned, it was seconded by Oliver Barrett. The meeting was adjourned.

The 2018 Officers and Board Members



Here is the presentation by Jeffrey Pawlan, WA6KBL on the history of circular waveguide, the use of low loss circular waveguide, transitions to rectangular waveguide, and expremely high performance dual mode feedhorns for 10GHz and 24GHz with builtin adapters to standard rectangular waveguide.

Please click here to view or download.Circular waveguide and horn antenna talk. This is a Powerpoint.

Beacons

Microwave Beacons in operation The following beacons are known to be operating as of 04-16-2016:

NameGridCoordsFreqCallPowerAntComments
Mt Vaca CM88wj 38.415, -122.116 10368.325 W6ASL +30dBm 10dBi omni CW ID
Mt Allison CM97bl 37.500, -121.872 10369.192
10369.225
10368.625
24192.010
47061.017
AD6FP/R


W6QI/B
WA6QDP
+17dBm
+30dBm total out

+17dBm
+12dBm
10dBi omni


12dBi omni
open WG
CW ID, drifts ~10 kHz
Linear translator: Output is 11-55 kHz above beacon
Input 600 kHz below desired output
CW ID
FM ID, aimed to Los Gatos
Mt Leeson CM97ae 37.167, -121.924 10367.990
24191.975
47087.99
79919.92
KF6KVG +20dBm
+20dBm
+5dBm
-5dBm
2.5" horn
1.5" horn
1.25" horn
0.6" horn
FM ID, locked, aimed NW
FM ID, locked, aimed NW
FM ID, unlocked, aimed NW
no ID, locked, aimed NW
Bear Mtn. DM06ir 37.747, -119.281 24191.990 W6BY/B +27dBm 20 slot omni locked, IDs as DM07IC, will fix
Mt Frazier DM04ms 34.775, -118.969 10368.310 N6CA/B +31dBm 14dBi omni CW ID, locked
Heaps Peak DM14kf 34.235, -117.141 10368.370 ? +?? dBm ??dBi omni CW ID
Palos Verdes DM03ts 33.747, -118.336 10368.300 N6CA/B +32dBm 14dBi omni CW ID, locked
Santiago DM13fr 33.712, -117.534 10368.330 KE6JUV +27dBm 10dBi omni CW ID, locked
San Miguel DM12mq 32.697, -116.935 5760.000
10368.360
24192.050
K6QPV/B
N6IZW/B
K6QPV/B
+34dBm
+27dBm
+34dBm EIRP
10dBi omni
12dBi omni
horn
      -
CW ID, locked
CW ID, locked, aimed to LA