50 MHz & Up Group

Club Logo

Archive of Documents and Presentations

Technical talk on rainscatter propagation, Jim Moss, N9JIM, Sept 2020
Technical Workshop, 122GHz VK3CV Transceivers, Mike, K6ML, July 2020
Cheap and Simple Transverters and Multiband Microwaves, Paul, W1GHZ, June 2020
A hybrid SDR made from the mcHF UI board and the HackRF front end, Gary, K6MG, May 2020
Millimeter Wave Path Selection and Propagation Prediction, Mike, K6ML, April 2020
New World Distance Record on 122GHz, Mike, K6ML, April 2020
Low noise amplifier design and implementation, Goran, AD6IW, March 2020
A discussion of 80GHz equipment and operation by Jim Moss, N9JIM, Feb 2020
the History and Theory of Circular Waveguide and also Pawlan-Pickett-Potter Feedhorns, by Jeffrey, WA6KBL, Nov. 2019
A tale of two 122 GHz Radios, K6ML and VK3CV at MUD Oct. 2019
the annual tuneup results and summary, July 2019
Description of the Upgraded Beacons on Mt Allison with Instructions, June 2019
A Stressed DIsh for EME Roving, Gary, K6MG, Mar. 2019
mcVx SDR microwave IF exciter project, Mike, K6ML, Nov. 2018
16x16 Patch Array Antenna for 10GHz, Miroslav Pajovic, WA6MP, Aug. 2017
a block diagram of the unmodified Harris DVM 10 surplus radios, Sept. 2014
AD6FP 10 24 flip switch radio 2014
Build Your Own 10 and 24 GHz Radio group project documents
KK6MK and AD6IW 3600 MHz Synthesizer and Mixer, Sept. 2012
High Efficiency Amplifiers, by Goran, AD6IW, Sept. 2010
Improvement of the Stellex/Endwave YIG Synthesizer, by Jeffrey, WA6KBL, July 2010
an Introduction to Amateur Radio Microwave Operation, by Brian Yee, W6BY, June 2010
the Ham Radio Social at the 2010 International Microwave Symposium
Using a SDR at 144MHz for a 10GHz IF, by Jeffrey, WA6KBL, May 2009
Filter Software Available for Download (2009)
Documentation for Harris 10GHz surplus equipment
24GHz transverter design and construction by Jim, N9JIM, Nov. 2006
Build your own waveguide to coax transitions, Jan. 2002
10 and 24 GHz dual band feed, by AD6FP and AD6IW, Aug 2001
W5LUA's paper on using the PCOM modules at 24 GHz, Sept. 2000


Technical talk on rainscatter propagation by Jim Moss, N9JIM, Sept 2020

Jim gave this presentation for our virtual meeting in Sept, 2020
Here are two versions in PDF format which you can view or download: Please click here to view or download, but the audio does not seem to work
Please click here to view or download. this one has time lapsed view of the weather radar.

Technical Workshop, 122GHz VK3CV Transceivers, Mike, K6ML, July 2020

Mike gave this presentation over the air for our virtual meeting in July, 2020
Here are his slides in PDF format which you can view or download: Please click here to view or download

Cheap and Simple Transverters and Multiband Microwaves, Paul, W1GHZ, June 2020

Paul Wade,W1GHZ gave a live presentation via zoom. He talked about low-cost transverters and a multiband microwave radio.
Here is his oresentation in PDF format which you can view or download: Please click here to view or download

A hybrid SDR made from the mcHF UI board and the HackRF front end, Gary, K6MG, May 2020

Gary gave this presentation over the air for our virtual meeting on May 5, 2020
Here is his presentation in PDF format which you can view or download: Please click here to view or download

Millimeter Wave Path Selection and Propagation Prediction, Mike, K6ML, April 2020

Mike gave this presentation over the air for our virtual meeting in April, 2020
Here is his oresentation in PDF format which you can view or download: Please click here to view or download

New World Distance Record on 122GHz, Mike, K6ML, April 2020

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

Low noise amplifier design and implementation, Goran, AD6IW, March 2020

Goran gave this presentation showing the steps required to design and simulate a 10GHz LNA and also a 24GHz PA
Here is his oresentation in PDF format which you can view or download: Please click here to view or download

A discussion of 80GHz equipment and operation by Jim Moss, N9JIM, Feb 2020

Jim gave this presentation showing the propagation graphs in the 76GHz and 80GHz regions of this band. He showed his transceiver construction and block diagram. He also included photos of transceivers built by a few others.
Here is his presentation in PDF format which you can view or download: Please click here to view or download

the History and Theory of Circular Waveguide and also Pawlan-Pickett-Potter Feedhorns, by Jeffrey, WA6KBL, Nov. 2019

This is the updated version of a presentation made to several IEEE meetings. The origin of circular waveguide and its development by Bell Labs is shown. Simulated measurements of loss for various diameters shows practical usage for ham radio. Also included is the presentation of a novel dual mode feedhorn with linear polarization that has nearly no sidelobes or backlobes. This design includes a high performance and compact transition to standard rectangular waveguide.
Here is his presentation in PDF format which you can view or download: Please click here to view or download

A tale of two 122 GHz Radios, K6ML and VK3CV at MUD Oct. 2019

This presentation show two different 122GHz radio designs. The chips are different so the antennas are different.
Here is the complete article as a PDF: Please click here to view or download

the annual tuneup results and summary, July 2019

Here is the Summary and also the tuneup results from the picnic in July 2019. These two documents are both PDFs.
Here is the Tuneup Summary: Please click here to view or download
Here is the complete results document: Please click here to view or download

Description of the Upgraded Beacons on Mt Allison with Instructions, June 2019

The Mt allison Beacons were rebuilt and upgraded. This presentation shows how they work and how to use their features.
Here is the PDF document: Please click here to view or download

a Stressed Dish for EME Roving, Gary, K6MG, Mar. 2019

a 5m portable dish for EME.
Here is the PDF document: Please click here to view or download

mcVx SDR microwave IF exciter project, Mike, K6ML, Nov. 2018

This is about Mike's kit-built "mcHF" QRP transceiver from M0NKA in the UK. Mike built this unit as an IF rig, and he has made a number of custom modifications. This includes his slides on the mcVx SDR microwave IF exciter plus 3 bonus pages of construction details including the RF board mods for common IF to the miniverter.
Here is the PDF document: Please click here to view or download

16x16 Patch Array Antenna for 10GHz, Miroslav Pajovic, WA6MP, Aug. 2017

a technical presentation with simulations showing how to make a single patch antenna and then expand it to 256 patches.
Here is the PDF document: Please click here to view or download

a block diagram of the unmodified Harris DVM 10 surplus radios, Sept. 2014

Several members have used the farinon DVM 10 as a source of 10 GHz LO, filter, LNA and PA modules.
Here is the PDF document: Please click here to view or download

AD6FP 10 24 flip switch radio 2014

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

Build Your Own 10 and 24 GHz Radio group project documents

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
Here is a link to the PDF document describing the radio building workshops: Please click here to view or download
Here are four more links to documents used in that project:
AD6FP 10 24 flip switch radio 2014: Please click here to view or download
10 and 24 GHz dual band feed, by AD6FP and AD6IW, Aug 2001: Please click here to view or download
KK6MK and AD6IW 3600 MHz Synthesizer and Mixer, Sept. 2012: Click here to download it
W5LUA's paper on using the PCOM modules at 24 GHz, Sept. 2000: Please click here to view or download

KK6MK and AD6IW 3600 MHz Synthesizer and Mixer, Sept. 2012

the 3744 to 144 MHz up/down converter that is shown as the first IF in the project's 10/24 GHz radio design. This was presented in MUD 2012.
Here is the PDF document: Click here to download it

High Efficiency Amplifiers, by Goran, AA6IW, Sept. 2010

presented at the Sept 2010 meeting.
Here is the PDF document: Please click here to view or download

Improvement of the Stellex/Endwave YIG Synthesizer, by Jeffrey, WA6KBL, July 2010

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 go to this webpage and then scroll down to nearly the bottom of that webpage: Please click here

an Introduction to Amateur Radio Microwave Operation, by Brian Yee, W6BY, June 2010

Here is the PDF document: 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

Using a SDR at 144MHz for a 10GHz IF, by Jeffrey, WA6KBL, May 2009

This presentation was made from a live demonstration at an IEEE meeting.
Here is the PDF document: Please click here to view or download

Filter Software available for download

Dionysus is a windows program that synthesizes, edits, analyzes, and joins filter circuits from audio to microwave frequencies. DIONYSUS is capable of designing from many different transfer functions, including Bessel, Gaussian, Butterworth, Tchebychev, Elliptic, and Pole Placed. ComNav Engineering has given us the right to distribute copies of the filter development software on this site for free provided it is for non-commercial use.
Here is a zip file containing the program: Please click here to download

Documentation for Harris 10GHz surplus equipment

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

24GHz transverter design and construction by Jim, N9JIM, Nov. 2006

Jim's 24GHz portable station design used some surplus pieces and used a 3920MHz 1st IF frequency.
Here is his presentation in PDF format which you can view or download: Please click here to view or download

Build your own Waveguide to Coax Transitions

We have received written permission to post a published article from Applied Microwaves & Wireless Magazine (long-gone and is now High Frequency Electronics) that appeared in the Feb 2001 issue. The article is by Richard Kurzrok and gives you all the machining dimensions you will need to make a transition for any waveguide band from WR229 through WR42. These include the exact tuning screw placements.
Here is the PDF document: Click here to download

10 and 24 GHz dual band feed, by AD6FP and AD6IW, Aug 2001

Lars and Gary designed a dual band feed for offset dishes that allows the operator to use a flipswitch radio to make contacts on both 10GHz and 24GHz with one dish.
Here is the PDF document: Please click here to view or download

W5LUA's paper on using the PCOM modules at 24 GHz, Sept. 2000

Here is the PDF document: Please click here to view or download