50 MHz & Up Group

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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.
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For questions about this group or about programs and activities, please contact the 2020 President, Mike Lavelle (K6ML):  miclevel at comcast.net

2020 dues and member information must be updated

If you have changed your address, email, phone, other info, please send a simple email to jpawlan@yahoo.com
If nothing has changed at all, then once a year please send an email saying nothing has changed. Make sure you state whether your email address has been changed or not.
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

Location, day, and time of the meetings of the 50MHz and Up Group:

We have reserved the Summit Room within the Sports Basement store in Sunnyvale for 7pm on the first Tuesday of each month except for December.
The address of the Sports Basement is:
1177 Kern Ave
Sunnyvale, CA

March 2020 Meeting Announcement

Our next meeting will be on Tuesday March 3 at 7pm in the "Summit Room" at the Sunnyvale Sports Basement (see above). All of our meetings are public and everyone is invited. The program will be Basic LNA Design and Implementation by Goran Popovic, AD6IW. Then we will have a roundtable to discuss projects or people's need for help with projects.

New World Distance Record on 122GHz

On Feb 17, 2020 a new distance record was established on 122GHz: 139km
Mike, K6ML, was on Mt Vaca (CM88WJ75ON, 835m ASL) and Oliver, KB6BA, and Jim, N9JIM, were both on Mt Umunhum (CM97BD18VJ, 1016m ASL)
The antennas were 60 cm satellite TV dishes and the transmit power was less than half a milliwatt of output power on 122 GHz. The complete transceivers were on a chip by Silicon Radar and they were designed as sensors.
The received signal level was very weak: 7 dB above the noise in 22 Hz; -13 in 2500 Hz equivalent with QSB down to the noise floor.
Dish alignment was done on 24GHz where the signal levels were very strong.
This had to be planned according to the weather as the water absorption is very great. The weather the morning of the contacts was Dew Point -11C, Air Temp +15C, path loss ~ 225 dB, atmospheric loss ~0.35 dB/km

Mike posted some video and audio on youtube: click here for youtube

the 2020 Officers

Mike Lavelle (K6ML) president
Pete Mahowald (K6TJ) vice president
Brian Kline (WA6QDP) secretary
Oliver Barrett (KB6BA) treasurer
Paul Zander (AA6PZ), director
David Fifield (AD6A), director
Stuart Neubarth, (WA6SFI), director


Microwave Beacons in operation The following beacons are known to be operating as of 06-30-2019:

Mt Vaca CM88wj 38.415, -122.116 10368.325 W6ASL +30dBm 10dBi omni CW ID
Mt Allison CM97bl 37.500, -121.872 10369.000

+29dBm total out

10dBi omni
12dBi omni
+20 dBi horn 27 deg beamwidth, aimed SW
CW ID, locked, S-meter output
Linear translator: Output is 11-55 kHz above beacon
Input 600 kHz below desired output
CW ID locked
CW ID locked
Mt Leeson CM97ae 37.167, -121.924 10367.990
KF6KVG +20dBm
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 1296.297

xtal few Hz
CW ID, locked
CW ID, locked
CW ID, locked