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  03/21/2024 and will be updated once a week or so.  ADVANCED REGISTRATION CLOSES ON MAY 2ND.

         BANQ   SYMP 
01/04/2024  Sean   Adkins   KH7RMG   YES   YES 
03/04/2025  Charles   Agosti   WD8AXA   YES   
01/07/2024  Susan   Aiello   W2SBA   YES   
01/10/2024  Ernie   Antczak   W3ETE   YES   YES 
01/07/2024  Dennis   Archer   WA7ZBQ   YES   YES 
03/15/2025  Roy   Ashkenaz   K2RMA   YES   YES 
02/21/2024  Barbaros   Asuroglu   WB2CBA   YES   YES 
01/05/2024  Gary   Auchard   W0MNA   YES   YES 
01/05/2025  Martha   Auchard   W0ERI   YES   YES 
03/22/2025 Peter Ayearst VE3POA    YES 
01/25/2024 Frederick Baguhn W9GOC  YES   YES 
01/25/2024  Betsy   Baguhn   WN9GOC   YES   YES 
01/16/2024 James Bailey AJ8S     YES 
01/15/2024  Ross   Ballantyne   VK1UN   YES   YES 
01/20/2024 Steven Barkes W5RRX   YES   YES 
01/06/2024  Cliff   Batson   N4CCB   YES   YES 
01/09/2024  Mike   Benedict   W0DDD     YES 
01/16/2024  Robert   Benedict   KD8CGH     YES 
02/03/2024 Robert Bennet NZ2Z  YES   YES 
01/08/2024  David   Beverstein   VE3KCL   YES   YES 
01/30/2025 Jim Biggerstaff N0TKN  YES   YES 
02/04/2024 Sam Billingsley AE4GX  YES   
02/03/2024 Richard Bishopp KD2UBJ  YES   YES 
02/03/2024  Suzanne   Bishopp   W2SUZ   YES   
01/07/2024 Michael Blake N9KLM    YES 
03/14/2025 Paul Blum K9ARF  YES   YES 
01/30/2025  Jack   Boswell   N0KSF   YES   YES 
01/07/2024  Mario   Bouchard   VA2EK     YES 
01/06/2024 Edward Brady AE8Q    YES 
01/13/2024  Charles H.   Brown   W3CHB   YES   YES 
02/14/2024  Charlie   Brown   NJ7V   YES   YES 
01/13/2024 Stewart Bryant G3YSX  YES   YES 
01/08/2024  Ed   Cabic   N2EC   YES   YES 
02/18/2024  Joe   Camilli   N7QPP   YES   YES 
02/18/2024  Peggy   Camilli     YES   
02/12/2024  Matthew   Canel   KE8NZR   YES   YES 
03/05/2025  Robert   Crane   W8SX   YES   YES 
01/09/2024  David   Cripe   NM0S   YES   YES 
03/17/2025 Richard Dickens KY0Q    YES 
01/09/2024  Mike   Dooley   N5GBZ   YES   YES 
01/09/2024 Peggy Dooley    YES   YES 
03/15/2025  Alan   Edmonds   KE8JJS     YES 
01/05/2024  Ronald   Eike   KA3PSO   YES   YES 
01/08/2024 Joshua Ellis N5FY  YES   YES 
03/04/2025  Don   Elrod   KB5QR     YES 
01/08/2024 Gersohn Epstein KO4IUK    YES 
02/25/2024 Thomas Ernst N4LIA    YES 
01/05/2024 Baab Finch W9YA  YES   YES 
01/12/2024  Steven   Ghertner   WD4CFN     YES 
01/07/2024 Matthew Gibbs WA8AQS    YES 
01/12/2024 Kevin Gilot NZ1I  YES   YES 
01/09/2024  Bernd   Goetter   DH5IS   YES X2   YES 
01/10/2024  Thomas   Graf   WV8TG   YES   YES 
01/19/2024  Daniel   Grambihler    NV0B   YES   YES 
01/09/2024  Raymond   Gretlein   W6QPA   YES   YES 
02/04/2024  Shirley   Gubatan     YES   
01/31/2025 John Guenther AA0BP  YES   
01/31/2025  Charles   Guenther   K0VSH   YES   
01/31/2025  Jack   Guenther   KF0GNL   YES   
02/14/2024  Dale   Hammer   K9NN     YES 
03/10/2025 Kevin Heise VA3KHH    YES 
01/23/2024 Gerald Hertle WA9AGG  YES   YES 
03/06/2025  William   Higgs   NT4C   YES   YES 
02/07/2024 Allen Hill KI4QCK  YES   YES 
01/12/2024  Mary   Holtschneider   KG4OQA   YES   YES 
01/12/2024  David   Holtschneider   KG4OPZ   YES   YES 
02/22/2024 David Hostetler W6OQ  YES   YES 
01/07/2024  Donald   Huddler   N4RTT   YES   YES 
01/20/2024  GD   Hudelson   W8HUD     YES 
02/05/2024 William Hulley K7WXW  YES   YES 
01/31/2025  Jock   Irvine   N1JI   YES   YES 
02/12/2024  Mark   Janzer   K5MGJ   YES   YES 
02/12/2024 Julie Janzer KF5FLZ  YES   YES 
02/05/2024  Sam   Johnson     YES   YES 
02/25/2024 Mitchell Johnson KN4ONH    YES 
02/25/2024  Mitchell   Johnson   KN4ONH     YES 
01/08/2024 Harry Jones K9DXA  YES   YES 
02/03/2024  David   Jones   N9DBJ     YES 
02/14/2024 David Kazdan AD8Y    YES 
02/22/2024  Bill   Kelsey   N8ET   YES   YES 
02/28/2025  Kathleen   Kerns   KK6CN   YES   YES 
01/19/2024  John   Kitchens   NS6X   YES   YES 
01/08/2024  Daniel   Koellen   AI6XG   YES   YES 
03/19/2025  Lee   Kolodziej   KC2VFX   YES   YES 
03/16/2025 Ara Kourchians N6ARA  YES   YES 
01/07/2024 Karl-Heinz Kremer K5KHK  YES   YES 
03/18/2025 Konrad Kristensen KAILD    YES 
02/15/2024  Arun   Kumar   W8ARU   YES   YES 
01/10/2024  Edward   Kwik   AB8DF   YES   YES 
02/09/2024  Stephen   Lawrence   AA8AF   YES   YES 
01/06/2024  Carlton   Lee   W2PTZ   YES   YES 
01/08/2024  Gary   Lee   KB9ZUV     YES 
02/12/2024  Gerald   LeMay   VA2GJ   YES   YES 
03/10/2025  William   Liles   NQ6Z     YES 
01/06/2024  James   Lilly   AA4K   YES   YES 
02/10/2024 Thomas Little N0DSP  YES   YES 
01/16/2024 Ed Long WA4SWJ  YES   YES 
01/09/2024  Dave   Matthews   KI4PSR   YES   YES 
01/11/2024 Joe McEwen  KA3UIP  YES   YES 
03/06/2025  Eric   McFadden   WD8RIF   YES   YES 
03/06/2025 Miles McFadden, KD8KNC  YES   YES 
01/06/2024  Richard   McGaver   NK9G   YES   
01/20/2024  Pete   Meier   WK8S   YES   
01/07/2024  Jean-Francois   Menard   VA2SS     YES 
02/03/2024  Wayne   Michael       YES 
01/11/2024  Doug   Miller   W4DML   YES   YES 
02/02/2024  John   Miller   KJ3X   YES   YES 
03/06/2025  Kevin   Moderow   WA9VFD   YES   YES 
02/02/2024  Michael   Murphy   KI8R   YES   YES 
01/07/2024  David   New   N8SBE   YES   YES 
03/10/2025  Shaun   Newcomer   KT2O     YES 
01/09/2024  Gary   Norman   W1PG     YES 
03/06/2025  Montgomer   Northrup   N5ESE   YES   YES 
03/17/2025  Olaf   Nurmepuu   W9FY     YES 
01/31/2025 Neil Ormos N9NL    YES 
03/18/2025  Rob   Orr   K9RST     YES 
01/10/2024 Dino Papas KLØS   YES   YES 
01/10/2024  Toby   Papas   KLØSS   YES   
01/08/2024 Wayne Pecena N1WP    YES 
01/09/2024 Will Perry    YES   YES 
03/18/2025  Albert   Peter   AC8GY     YES 
01/05/2024 Fred Piering WD9HNU  YES   YES 
02/05/2024  Daniel   Presley   N7CQR   YES   YES 
02/29/2025 Jack Purdum
W8TEE 
 YES   YES 
01/08/2024 Robert Rai KB7ZGB    YES 
02/26/2025  Michael   Ramos   AE0IH     YES 
01/05/2024 Marty Ray N9SE  YES   YES 
01/05/2024  Emily   Ray   N9MLE   YES   YES 
01/05/2024  DeeAnn   Ray   N9XLV   YES   YES 
03/13/2025  Bruce   Raymond   ND8I     YES 
01/06/2024 William Ribish W9LR  YES   
01/06/2024 Steve Rice W0SER  YES   YES 
01/06/2024 Lon Richoz  W9XU   YES   
03/05/2025  Leonard   Riggins   AB8XA   YES   
03/05/2025 Barb Riggins W8FCJ  YES   
02/04/2024  David   Ritchie   N4DJS   YES   
01/10/2024 William Robbins WA8CDU    YES 
02/15/2024 Stan Rogacki K2EXX    YES 
01/10/2024  Andy   Rudolph   KY4DF     YES 
02/04/2024 Thomas Sargent W5VS  YES   YES 
01/10/2024 Mitchel Sayare NK3H  YES   YES 
01/06/2024  Fred   Schader   WA7AII   YES   YES 
01/23/2024  Howard   Sherer   AE3T     YES 
01/16/2024  Howard   Shpegel   AC1MN   YES   YES 
01/23/2024  Joseph   Silvasi   KC2J   YES   YES 
02/03/2024  Thomas   Skemp   NF9E     YES 
01/19/2024 Tony Slawinski  KA7VDY  YES   YES 
01/11/2024  Harold   Smith   KE6TI   YES   YES 
01/10/2024 Benjamin Spangler KN4ETD    YES 
03/17/2025  Wes   Spence   AC5K     YES 
03/17/2025  Chris   Spense   KA5PXK     YES 
01/08/2024  Lawrence   Stoskopf   N0UU   YES   YES 
01/08/2024  JoAnn   Stoskopf     YES   
01/16/2024  Michael   Suhar   W8RKO     YES 
01/08/2024  Hans   Summers   G0UPL   YES   YES 
01/06/2024  Al   Sutton  N4EII  YES   YES 
01/09/2024 Mark Swartwout  NX1K  YES   YES 
01/09/2024  Laurie   Swartwout     YES   
03/04/2025 Mindy Tai KB8CRT  YES   
01/08/2024  Brent   Taylor   VY2HF/W1PJ   YES   YES 
01/10/2024  Glenn   Taylor   VE9GJ   YES   YES 
02/19/2024 Dennis Terribile WR4I  YES   YES 
03/09/2025  Greg   Tilford   KM5GT     YES 
02/20/2024  William   Tilman   KA0B   YES   YES 
01/08/2024  Kent   Trimble   K9ZTV   YES   YES 
01/08/2024  Vaclav   Ujcik   WD9HBC   YES   YES 
02/25/2024  Robert   VanValzah   KE9YQ   YES   YES 
01/05/2024  Dan   Veerhusen   W0WMU     YES 
02/10/2024  Robert   Vosatka   WA2I     YES 
02/06/2024  Daniel   Walter   NM3A   YES   YES 
01/03/2024  Jerry   Weisskohl   AC4BT   YES   YES 
01/21/2024  Dave   Wilcox   K8WPE   YES   YES 
03/06/2025 Thomas Witherspoon K4SWL  YES   YES 
01/05/2024 Gerald Wolczanski KI4IO  YES   YES 
01/05/2024  Robin   Wolczanski     YES   
01/31/2025  Stephen   Wolfcale   N9WAT   YES   
01/15/2024  Steven   Wood   W1SR   YES   YES 
02/05/2024  John   Young   WA8KNE   YES   YES 
01/06/2024  Jordan       YES   

FDIM 2024 Transmitter Challenge

Announcing - the FDIM2024 LOGIC IC TRANSMITTER POWER 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
https://sites.google.com/nm0s.com/home/

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

HOLIDAY INN ROOMS ARE NOW FULL - 2/13/2024 

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. 

INCLUDE THE CALL SIGN YOU WANT ON YOUR NAME TAG

Door prizes!!  Win an Icom 705, an Elecraft KH1 Edgewood Package, 4SQRP T41 Kit,  Paddles, Kits - do not miss out! 

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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Visiting FDIM for the first time ?
Here's a guide so you know what to expect . . .

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