FDIM 2024 Speakers List

Four Days In May (FDIM) - the biggest and best QRP event in the World !

FDIM will be held at the Holiday Inn Fairborn Ohio.

Speaker Listing for FDIM 2024

Thursday MAY 16 2024 

Jack Purdum W8TEE - "The Construction and Use of a WhosZat"
Ashhar Farhan VU2ESE - "Evolving CW to SDRs: Using sbitx to bring CW to 21st century"
Cliff Batson N4CCB - "Adventures of a QRP Evangelist"
Hans Summers G0UPL - "Top 10 Junkbox projects!"
Wayne Burdick N6KR - "Designing the Elecraft KH1: From Vision to Reality"
Tom Witherspoon K4SWL - "Amplifying Your Adventures, Minimizing Your Power"
Gregg Latta AA8V - "The Amazing Thermionic Valve"
Ross Ballantyne VK1UN - "Stealth Ops from hotel rooms and other unlikely QTHs"
Topics, and times of presentation will be added as we have them.  Registration for FDIM 2024 will begin sometime in January 2024.

FDIM 2024 Registered Attendees

The following folks have registered for the 2024 Four Days IN May event.

Symposium, the banquet, or both.

If you are not on this list and you have PAID.  Send an email to This email address is being protected from spambots. You need JavaScript enabled to view it. and we will get it straightened out. Include when you paid, how much you paid, and how you paid. If you have your Paypal receipt or Paypal transaction code, send that as well.  This list is current though the morning of 04/12/2024 and will be updated once a week or so.  ADVANCED REGISTRATION CLOSES ON MAY 2ND.

       BANQ   SYMP 
Sean Adkins KH7RMG  YES   YES 
Charles Agosti WD8AXA  YES   
Susan Aiello W2SBA  YES   
Ernie Antczak W3ETE  YES   YES 
Dennis Archer WA7ZBQ  YES   YES 
Roy Ashkenaz K2RMA  YES   YES 
Barbaros Asuroglu WB2CBA  YES   YES 
Gary Auchard W0MNA  YES   YES 
Martha Auchard W0ERI  YES   YES 
Peter Ayearst VE3POA    YES 
Frederick Baguhn W9GOC  YES   YES 
Betsy Baguhn WN9GOC  YES   YES 
James Bailey AJ8S     YES 
Ross Ballantyne VK1UN  YES   YES 
Steven Barkes W5RRX   YES   YES 
Cliff Batson N4CCB  YES   YES 
Reginald Beardsley    YES   YES 
Mike Benedict W0DDD    YES 
Robert Benedict KD8CGH    YES 
Robert Bennet NZ2Z  YES   YES 
David Beverstein VE3KCL  YES   YES 
Jim Biggerstaff N0TKN  YES   YES 
Sam Billingsley AE4GX  YES   
Richard Bishopp KD2UBJ  YES   YES 
Suzanne Bishopp W2SUZ  YES   
Michael Blake N9KLM    YES 
Paul Blum K9ARF  YES   YES 
Jack Boswell N0KSF  YES   YES 
Mario Bouchard VA2EK    YES 
Edward Brady AE8Q    YES 
Jocelyn Brault KD8VRX    YES 
CharlesH. Brown W3CHB  YES   YES 
Charlie Brown NJ7V  YES   YES 
Stewart Bryant G3YSX  YES   YES 
Craig Buck K4IA  YES   YES 
Ed Cabic N2EC  YES   YES 
Joe Camilli N7QPP  YES   YES 
Peggy Camilli    YES   
Matthew Canel KE8NZR  YES   YES 
George Carey N9DXP    YES 
Robert Crane W8SX  YES   YES 
David Cripe NM0S  YES   YES 
Richard Dickens KY0Q    YES 
Mike Dooley N5GBZ  YES   YES 
Peggy Dooley    YES   YES 
Jeff Dygulski      YES 
Alan Edmonds KE8JJS    YES 
Ronald Eike KA3PSO  YES   YES 
Joshua Ellis N5FY  YES   YES 
Don Elrod KB5QR    YES 
Gersohn Epstein KO4IUK    YES 
Thomas Ernst N4LIA    YES 
Baab Finch W9YA  YES   YES 
Steven Ghertner WD4CFN    YES 
Matthew Gibbs WA8AQS    YES 
Kevin Gilot NZ1I  YES   YES 
Bernd Goetter DH5IS  YES X 2   YES 
Thomas Graf WV8TG  YES   YES 
Daniel Grambihler  NV0B  YES   YES 
Raymond Gretlein W6QPA  YES   YES 
Shirley Gubatan    YES   
John Guenther AA0BP  YES   
Charles Guenther K0VSH  YES   
Jack Guenther KF0GNL  YES   
Eric Gunter KC2TXO    YES 
Dale Hammer K9NN    YES 
Kevin Heise VA3KHH    YES 
Gerald Hertle WA9AGG  YES   YES 
Jeff Hetherington VA3JFF  YES   YES 
Wendy Hetherington VE3TKS  YES   
William Higgs NT4C  YES   YES 
Allen Hill KI4QCK  YES   YES 
Mary Holtschneider KG4OQA  YES   YES 
David Holtschneider KG4OPZ  YES   YES 
David Hostetler W6OQ  YES   YES 
Stephen Houser N1SH  YES   YES 
Alfred Hovey WA9BZW  YES   
Donald Huddler N4RTT  YES   YES 
GD Hudelson W8HUD    YES 
William Hulley K7WXW  YES   YES 
J Humphrey W4IM  YES   YES 
Jock Irvine N1JI  YES   YES 
Mark Janzer K5MGJ  YES   YES 
Julie Janzer KF5FLZ  YES   YES 
Sam Johnson    YES   YES 
Mitchell Johnson KN4ONH    YES 
Harry Jones K9DXA  YES   YES 
David Jones N9DBJ    YES 
Jonathan Kayne KM4CFT  YES   
David Kazdan AD8Y    YES 
Bill Kelsey N8ET  YES   YES 
Kathleen Kerns KK6CN  YES   YES 
John Kitchens NS6X  YES   YES 
Daniel Koellen AI6XG  YES   YES 
Lee Kolodziej KC2VFX  YES   YES 
Ara Kourchians N6ARA  YES   YES 
Karl-Heinz Kremer K5KHK  YES   YES 
Konrad Kristensen KAILD    YES 
Arun Kumar W8ARU  YES   YES 
Edward Kwik AB8DF  YES   YES 
Stephen Lawrence AA8AF  YES   YES 
Carlton Lee W2PTZ  YES   YES 
Gary Lee KB9ZUV    YES 
Gerald LeMay VA2GJ  YES   YES 
William Liles NQ6Z    YES 
James Lilly AA4K  YES   YES 
Thomas Little N0DSP  YES   YES 
Ed Long WA4SWJ  YES   YES 
James Maloney K5TET    YES 
Cherry Mathews VE3CAI    YES 
Dave Matthews KI4PSR  YES   YES 
Joe McEwen  KA3UIP  YES   YES 
Eric McFadden WD8RIF  YES   YES 
Miles McFadden KD8KNC  YES   YES 
Richard McGaver NK9G  YES   
Pete Meier WK8S  YES   $   15.00
Jean-Francois Menard VA2SS    YES 
Wayne Michael AC9HP    YES 
Anthony Miliusis KE8SBZ  YES   YES 
Doug Miller W4DML  YES   YES 
John Miller KJ3X  YES   YES 
Kevin Moderow WA9VFD  YES   YES 
Michael Murphy KI8R  YES   YES 
David New N8SBE  YES   YES 
Shaun Newcomer KT2O    YES 
Gary Norman W1PG    YES 
Montgomer Northrup N5ESE  YES   YES 
Olaf Nurmepuu W9FY    YES 
Carlos Oneill KB4CO  YES   YES 
Neil Ormos N9NL    YES 
Rob Orr K9RST    YES 
Dino Papas KLØS   YES   YES 
Toby Papas KLØSS  YES   
Wayne Pecena N1WP    YES 
Will Perry    YES   YES 
Albert Peter AC8GY    YES 
Fred Piering WD9HNU  YES   YES 
Daniel Presley N7CQR  YES   YES 
Jack Purdum


Dave Ragnauth VE3OOI    YES 
Robert Rai KB7ZGB    YES 
Michael Ramos AE0IH    YES 
Marty Ray N9SE  YES   YES 
Emily Ray N9MLE  YES   YES 
DeeAnn Ray N9XLV  YES   YES 
Bruce Raymond ND8I  YES   
William Ribish W9LR  YES   
Steve Rice W0SER  YES   YES 
Lon Richoz W9XU  YES   
Leonard Riggins AB8XA  YES   
Barb Riggins W8FCJ  YES   
David Ritchie N4DJS  YES   
William Robbins WA8CDU    YES 
Stan Rogacki K2EXX    YES 
Andy Rudolph KY4DF    YES 
Thomas Sargent W5VS  YES   YES 
Mitchel Sayare NK3H  YES   YES 
Fred Schader WA7AII  YES   YES 
Mark Schreiner NK8Q  YES   YES 
Steve Schuck WB2WAK    YES 
Howard Sherer AE3T    YES 
Howard Shpegel AC1MN  YES   YES 
Joseph Silvasi KC2J  YES   YES 
Dave Skarbowski  KX3DX    YES 
Thomas Skemp NF9E    YES 
Tony Slawinski KA7VDY  YES   YES 
Harold Smith KE6TI  YES   YES 
Benjamin Spangler KN4ETD    YES 
Wes Spence AC5K    YES 
Chris Spense KA5PXK    YES 
Mike Stillwell AC0I  YES   YES 
Lawrence Stoskopf N0UU  YES   YES 
JoAnn Stoskopf    YES   
Michael Suhar W8RKO    YES 
Hans Summers G0UPL  YES   YES 
Al Sutton N4EII  YES   YES 
Mark Swartwout NX1K  YES   YES 
Laurie Swartwout    YES   
Mindy Tai KB8CRT  YES   
Brent Taylor VY2HF/W1PJ  YES   YES 
Glenn Taylor VE9GJ  YES   YES 
Dennis Terribile WR4I  YES   YES 
Greg Tilford KM5GT    YES 
William Tilman KA0B  YES   YES 
Kent Trimble K9ZTV  YES   YES 
Vaclav Ujcik WD9HBC  YES   YES 
Robert VanValzah KE9YQ  YES   YES 
Dan Veerhusen W0WMU    YES 
Robert Vosatka WA2I    YES 
Daniel Walter NM3A  YES   YES 
 Jerry  Weisskohl  AC4BT  YES   YES 
David Wendt VE3EAC    YES 
Ken Wezeman N9QIL    YES 
Dave Wilcox K8WPE  YES   YES 
Thomas Witherspoon K4SWL  YES   YES 
Gerald Wolczanski KI4IO  YES   YES 
Robin Wolczanski    YES   
Stephen Wolfcale N9WAT  YES   
Steven Wood W1SR  YES   YES 
John Young WA8KNE  YES   YES 
Jordan      YES   

FDIM 2024 Transmitter Challenge


It was common in the early days of solid-state QRP to rig up a 7400 TTL chip as a crude QRP transmitter.  With a crystal and a handful of parts, it was possible to put a few hundred milliwatts on the air for a couple bucks.   While these simple IC-based transmit circuits have fallen out of favor, QRPARCI is revisiting this bit of QRP history with the FDIM2024 LOGIC IC TRANSMITTER POWER CHALLENGE!  The challenge is simple:  Design and demonstrate a crystal-controlled 40M oscillator/PA to make the highest sustained power for a period of one minute using only a single 4000-series or 7400-series logic IC.  This event will take place at 8:00 PM Friday, May 17 during FDIM, and the winner recognized at the QRPARCI Banquet on Saturday, May 18, 2024.

The rules for the competition are simple, but we have to list every nit-picky detail to test your endurance anyway:  The design is to utilize a single 4000 or 7400 series logic IC as the only active circuit element.  There are no limits on the number of diodes, inductors, resistors, capacitors, or transformers, but a single IC may be the only active device.

The PA must be crystal controlled within the 40M amateur band.  One (or more) section of the IC must be a crystal oscillator to control the frequency of the transmitter and builders are encouraged to use their own crystals, though there will be 7030 kHz HC-49 crystals available at the competition. No external frequency source may be used.

ICs to be used must be of the 4000-series or 7400-series.  Different logic families of this type such as 74LSxx, 74HCxx, 54HCTxx etc. may be used.

The circuit must fit inside a 12” x 12” x 12” volume.  During the power test, the judges will cover the circuit with a blast shield to protect judges and contestants from flying bits!

All circuit components are to be visible for inspection.

A schematic of the circuit is to be provided with each entry.

A zero-to-24v variable power supply, 40M band-pass filter, dummy load and power meter will be supplied by the judges.

The competition will have two rounds of trials to demonstrate power output of each circuit, with the best performance of each circuit being its final score.  During each test, the builder will connect his circuit, set the power supply voltage and then announce to the judges when to begin measurement.  During a period of one minute in which the builder may not touch the circuit or power supply, the RF power output at the end of one minute will be taken as the score for that trial.  Failure of the circuit in that one minute test period results in a score of ZERO for that round!  

The winner is the circuit generating the highest power score during either of his two rounds. If the circuit fails during the first test period, the builder will have five minutes in which to repair it before the second round trials. If your entry sets off the smoke detector in the Holiday Inn, you will be disqualified and may be subjected to rude laughter and finger pointing during the rest of FDIM!

The winner of the FDIM2024 LOGIC IC TRANSMITTER POWER CHALLENGE! will be recognized at the QRPARCI Banquet Saturday May 18, 2024.

Questions regarding the POWER CHALLENGE may be addressed to David Cripe NM0S, This email address is being protected from spambots. You need JavaScript enabled to view it..  Good luck and good building!

Schedule for FDIM 2024

All times are Eastern Daylight Time (UTC -4)

Wednesday May 15 - Registration from 7:30PM to 9:30PM 

Thursday May 16 - Registration starts at 7:30AM Outside the Ballroom

Make sure you pick up your FDIM badge from the registration table

Thursday May 16 - Seminars

Beginning at 9AM and breaking at 10:45AM

Restarting at 11:00AM 

Lunch is from Noon to 1:00PM

Restarting at 1:00PM and ending at 5:00PM

7PM to 8PM - Vendor registration and setup - Main Ballroom, no public access

8PM to 10PM - Vendor Night

Friday May 17th

7PM to 8PM - Club Registration and setup in the Main Ballroom, no public access

7PM to 8PM - Show and Tell Homebrew Contest Registration and setup in Ballroom

8PM to 9PM - Homebrew Contest Judging in the Ballroom

8PM to 10PM - Radio Show and Tell in the Ballroom

8PM to 10PM - Receiver Challenge

8PM to 10Pm - Club Night in the Ballroom

Saturday May 18th 

7PM - Awards Ceremony and Grand Banquet in Ballroom 

9PM - Post Banquet Chat Sessions, bring your QSL cards to trade

Sunday May 19th 

Hamvention and head back home

If you have any questions please let us know !

FDIM 2023 Winners

FDIM Winners and BIG winners for 2023

Results of the Homebrew Contest
Category 100 Station Accessories
Adam Kimmerly K6ARK - 3D printed keys

Category 200 Transmitters Receivers Transceivers Power Supplies
Will Harris KI4POV - 4 band transceiver

Category 300 All Scratch Built
James Scott WB0IYC - Multi-Reflex Receiver

Category 400 Test Equipment and Construction Aids
Harold Smith AE6TI

Category 500 Antennas, Solar, and Battery Chargers
Ross Ballantyne VK1UN - Antenna Tuners

Best of Show
Ross Ballantyne VK1UN

The  2-Transistor Receiver Challenge proved a challenge to perform!  We had four entries, and it became evident early on that noise from nearby switching power supplies was preventing measurement of the actual receiver noise floor.  Consequently the RF to Audio gain of receiver was used as the evaluation criterion, instead of the original plan to measure MDS.  The outcomes of the event were:

Entrant                           Gain
James Scott WB0IYC    60 dB
Harold Smith KE6TI       59 dB
Jerry Wolczanski            -
Will Harris KI4POC        38 dB

The winner of the Begali Key was Frank Cates W5BAP
The winner of the IC705 was Jeff Tucker W9TH
The winner of the FT818/A817 package was Tim McLeod

David W. Cripe, NM0S
NM0S Electronics

FDIM Registration 2024

Four Days In May (FDIM) - the biggest and best QRP event in the World !

You can register at the event on Wednesday night May 15, and Thursday Morning May 16 before the symposium. 

FDIM will be held at the same location as last year,

Holiday Inn Fairborn.

2800 Presidential Drive, Fairborn, OH, 45324, USA

Phone: 1-877-666-3243

MAY 15 - May 19 2024


We are trying to get some more rooms, stay tuned. 


Below is the pricing for 2024 FDIM

Banquet - $40.00 per person

Symposium with Proceedings Book  - $35.00 per person - LUNCH PROVIDED 

Proceedings Book - $15.00 per book

Zoom Only Link - $12.00 per person - Zoom Link will be emailed to you a few days before FDIM

Send your payment via paypal to  This email address is being protected from spambots. You need JavaScript enabled to view it. - Please list what you are buying in the comments of the order. 


Door prizes!!  

FDIM has some of the most generous prize donors of any event.  We have donations of some MAJOR door prizes from Four-State QRP, Elecraft, MFJ, 3rd Planet Solar, Hamgadgets, DX Engineering and Icom America.  Prizes will be drawn both Thursday during the Forum, and Saturday evening during the Banquet.  

Stay tuned for more updates

FDIM 2024 Homebrew Contest

Friday 17 May 2024
8PM to 10PM

FDIM 2024 - Homebrew Contest - Show and Tell

As in the past, we intend to allow entries in the Homebrew Contest to be displayed in the Ballroom on Club Night, Friday night, May 17, between 8PM and 10 PM. To enter an item in the contest and insure that it is part of the voting (on Friday night), you must register your item on Friday night between 7 PM and 8 PM. A registration table will be outside the main Ballroom at that time on both nights.

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