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

Renewal and annual dues are past due.

For those who live within the Bay area, the annual dues for 2015 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 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.

Meeting Announcement

Our next meeting of the 50MHz and Up Group of N. Calif will be a regular meeting on Thursday, Sept 3, 2015 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 this meeting will be as follows:

introductions and new business
10GHz and Up August weekend activity results
plans for 10GHz and Up Sept. weekend activity
roundtable

A technical talk will be announced later

Slides from the April 2015 meeting on "An Introduction to Building 10/24 GHz Radios" by David Viera, KI6CLA

His slides are available to dues-paying members on the members-only page.

Older (2013) Group Project Notes: Building 10 and 24 GHz Radios

In 2013, we launched a club project with two goals:

- help microwave newcomers to build their first 10 GHz radio
- help club members to build a dual band (10/24 GHz) radio

Here is a new project description file:
Please click here to view or download the project overview slides from our March 2013 meeting:
- discussion of project goals
- 10 GHz and 10/24 GHz Rover Rig requirements
- 10 GHz components: LO, LNA, PA, Antenna, T/R, power supply
- Rover Platform (mechanical support) requirements
- Block Diagrams for 10, 24 and 10/24 GHz rigs

Please click here to view or download the project workshop slides from our May 2013 meeting:

- 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.

The 2015 Officers and Board Members were elected in the February 2015 meeting

Minutes from the August meeting by Brian Kline

Mike Lavelle called the meeting to order at 7:15 PM.
Dues ($10) for 2015 are past due. New members and members with contact information changes need to send an email to jpawlan@yahoo.com with their current contact information.


The swap meet in August will be 8/8
The annual N American 10GHz and Up contest will begin in August on Aug 15. The second weekend will be Sept. 19
Microwave Update 2015 (MUD) is October 15-18, at the Crown Plaza Hotel, San Diego. Papers are due September 1st.
Old Business
Brian Kline reported he had tentatively chosen a battery charger for the Mt Allison beacon battery. The charger being considered is the Japlar Schauer JAC0891-141 which will cost about $130. He is looking for a local source of fresh 12V 7Ah sealed lead acid batteries to build the 48V battery bank. /> New Business
no new business
This was followed by roundtable of operating plans for the August 15-16 weekend of the 10 GHz and Up contest. Jim Moss will be sending out an email to the reflector with peoples operating plans.
Technical Talk:
Brian Yee gave a presentation on microwave local oscillators, and considerations for the use of the various types.
The meeting ended at 9:00 PM.

Documentation for Harris 10GHz surplus equipment

Please log into the Members Only page to obtain two PDF files.

Improvement of the Stellex/Endwave YIG Synthesizer

by Jeffrey Pawlan, WA6KBL

The Stellex/Endwave mini-YIGs along with their phase locked synthesizer board are able to provide you with a stable and relatively low noise X-band signal source. However, they designed it incorrectly and most of the output power of the YIG is needlessly lost.

I have redesigned the sampling circuits so that you will now obtain +12dBm to +13.5dBm output power. It is an easy and inexpensive modification.

Because John Miles, KE5FX did the original work on using these surplus items and there are many links to his webpage, I have put my article along with nine photographs and figures on his webpage. Please click here to go to this page and then scroll down to nearly the bottom of that webpage.

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.

The presentation by Goran AD6IW on high efficiency amplifiers.

He gave at the 2010 EME conference and also at the 50MHz and Up meeting in Sept. Click here to download it

Report on the Ham Radio Social at the International Microwave Symposium on May 25, 2010 in Anaheim

The report and all photos are now located on a separate page. Please click here to view

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 Events tab page.

Beacons

Microwave Beacons in operation UPDATED The following beacons are known to be operating as of 02-06-2015:

NameGridCoordsFreqCallPowerAntComments
Mt Vaca CM88WJ 38 24.51, -122 06.50 10368.325 W6ASL +?? dBm ??dBi omni CW ID
Mt Allison CM97BL 37 29.905, -121 52.206 10369.192 AD6FP +17dBm 10 dBi omni CW ID, drifts ~10 kHz
Mt Allison CM97BL 37 29.905, -121 52.206 10369.225 AD6FP +17dBm 10 dBi omni Linear translator output is 11-55 kHz above beacon
Mt Allison CM97BL 37 29.905, -121 52.206 10368.625 AD6FP +17dBm 10 dBi omni Linear translator input 600 kHz below desired output
Mt Allison CM97BL 37 29.905, -121 52.206 24192.01 AD6FP +?? dBm ??dBi omni CW ID
Mt Allison CM97BL 37 29.905, -121 52.206 47061.017 WA6QDP +?? dBm ??dBi omni CW ID
Mt Leeson CM97AE 37 10.034, -121 55.500 10367.990 KF6KVG +?? dBm ??dBi omni FM ID, locked?
Mt Leeson CM97AE 37 10.034, -121 55.500 24191.975 KF6KVG +?? dBm ??dBi omni FM ID, locked?
Mt Leeson CM97AE 37 10.034, -121 55.500 47087.99 KF6KVG +?? dBm ??dBi omni FM ID, locked?
Mt Leeson CM97AE 37 10.034, -121 55.500 79920 KF6KVG +?? dBm ??dBi omni FM ID, locked? antenna aimed towrds Portola Valley
Heaps Peak DM14KF ?,? 10368.370 ? +?? dBm ??dBi omni FM ID
Mt Frazier DM04MS ?,? 10368.310 ? +?? dBm ??dBi omni FM ID
Palos Verdes DM03TS ?,? 10368.300 ? +?? dBm ??dBi omni FM ID
Santiago DM13FR ?,? 10368.330 ? +?? dBm ??dBi omni FM ID
San Miguel DM12MQ ?,? 10368.360 ? +?? dBm ??dBi omni FM ID