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. Lean more . . .

Contact

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

Announcements

2016 Renewal and annual dues are due.

For those who live within the Bay area, the annual dues for 2016 are $10 per year or $15 for 2 years. This must be sent via mail to the new Treasurer, Jerome Peters AF6UX or bring to the January meeting and hand it to him. Make the check payable to: 50MHz and Up Group of N. Calif.
Jerome Peters
19902 Baywood Dr
Cupertino, CA 95014


Those living outside of the Bay area do not pay dues and as Friends, do not vote and do not have access to the Members-Only webpage. Regardless of whether you are a full Member or you are a Friend, we are required to have a current database.

If none of your information has changed since last Feb, then please send Jeffrey Pawlan jpawlan@yahoo.com an email simply stating "nothing changed". If your phone or email or street address has changed, then you will need to fill out a complete new memberform. See the Membership link for instructions.

The 2016 Officers and Board Members

Meeting Announcement

Our next meeting of the 50MHz and Up Group of N. Calif will be a regular meeting on Thursday, May 5, 2016 at 7pm. Our meeting will be at the usual TI conference building, room 2. You get there from Kifer Rd as shown on our meetings page (click on meetings in the selection bar)

Our program will be:

Minutes from the April meeting 4/7/16 by Brian Kline

Mike Lavelle called the meeting to order at 7:15 PM.

Announcements

The 50 MHz and Up Group 2016 dues are due. $10 for a year, $15 for two years.
Send dues payments to the Treasurer, or give them to him at the next meeting.
Jerome Peters
19902 Baywood Dr.
Cupertino CA 95014


Also send an email to jpawlan@yahoo.com with your contact information. A form which can automatically be sent is available at http://www.50mhzandup.org/membership.html, or send an email indicating that your contact information remains unchanged.

The 10 and 24 GHz Rig Tune up Day/Picnic will be July 9th at Ed Levin Park in Milpitas. Rig setup will start around 9 AM with the actual testing will begin at 10 AM.

The temporary replacement for the Cactus 440 repeater on Mt Diablo has been installed, and working. An additional 900 MHz repeater is planned.

Upcoming Events

The SBMS 2 GHz and Up contest is coming up the weekend April 30, and May 1.

There was no new business and the formal part of the meeting was closed at 7:25pm

Program

The formal meeting was followed by a discussion of microwave contest strategies, led by Gary Lauterbach, AD6FP.

Stuart Neubarth, SK2X, demonstrated the operation of a Decawave UWB indoor positioning demo board, and software.

The meeting ended with a discussion of current projects and activities.



Recent Documents

David Combs and Rigol

They demonstrated some test equipment and how to make microwave measurements. Here is a PDF of many of the masurements:
Please click here to view or download Advanced RF Tips and Tricks

Current Updated Rosters Available to Members

Members may obtain the rosters in several sort orders by logging into the Members Only webpage. These have been updated but are not completely accurate because we did not receive updated memberforms or emails stating that your information has not changed. Also we need the dues from all local members.

2013 10/24 GHz club project documents

Group Project Notes: Building 10 and 24 GHz Radios

In 2013, we launched a Group project with two goals:
- help microwave newcomers to build their first 10 GHz radio
- help Group members to build a dual band (10/24 GHz) radio
Please click here to view or download the Group project presentation/workshops file Roadmap to 10 and 24 GHz.pdf
- 24 GHz test results for surplus PCOM upconverter and downconverter modules
- 10 GHz surplus brick (from Harris DVM10) retuning to 10224 MHz LO
- 10/24 GHz dual band feed construction workshop
- notes on T/R sequencing requirements

Please click here to view or download a block diagram of the unmodified Harris DVM 10 surplus radios:

- several members have used these as a source of 10 GHz LO, filter, LNA and PA modules
- the diagram includes some useful signal gain and level specs for the modules.

Please click here to view or download W5LUA's paper on using the PCOM modules at 24 GHz.

Please click here to view or download AD6FP and AA6IW's MUD 2001 paper on the 10/24 GHz dual band dish feed horn that we are building.

Please click here to view or download the MUD 2012 paper that describes the 3744 to 144 MHz up/down converter that is shown as the first IF in this project's 10/24 GHz radio design.

Please click here to view or download AD6FP's MUD 2001 paper on the 10/24 GHz "flip switch" radio architecture that is the inspiration for our 10/24 radio.

Two presentations by Brian Yee W6BY are available for download

A slide presentation on an Introduction to Amateur Radio Microwave Operation is available as a PDF. Click here to download it
The second presentation is located on the archive tab page.

Beacons

Microwave Beacons in operation UPDATED 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