The 29th Four Days In May (FDIM) 2025 - the biggest and best QRP event in the World !

You can register at the event on Wednesday night May 14, and Thursday Morning May 15 before the symposium. 

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

We have been informed by the Holiday Inn that the FDIM block of rooms have now sold out. We recommend that anyone wishing to stay at the Holiday in for FDIM to check with them periodically in the chance there may be a cancellation that might free up a room.

FDIM is - MAY 15 - May 18 2025

PRE-REGISTRATION IS NOW CLOSED.  WALK IN REGISTRATION
May 14 7:30-9:30PM EDT and May 15 7:30AM to 8:00AM at the Fairborn Holiday Inn

Below is the pricing for 2025 FDIM - SAME as last year! 

Banquet - $40.00 per person

Symposium with Proceedings Book  - $35.00 per person  (Includes Lunch)

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!!  

FDIM has some of the most generous prize donors of any event.  We have some MAJOR door prizes again this year! 

Elecraft test gear, CWMorse, Hannes Hiller, K6ARK Portable Radio, 3rd Planet Solar, Etherkits, Iowa QRP Club, QRP Labs,
Hamgadgets, DX Engineering donating a IC-705, Mindybear Surplus, Coffee and Ham Radios, Halibut Electronics, Begali Key,
4 States QRP Group, Sierra Radio Systems, Radioddity, Panther Creek Solutions - SPOOLTENNA, Hong's Electronics, 
QRP Builder, QRP Works, QRPme, Grayson Evans, HF Signals  plus many more! 

Prizes will be drawn both Thursday during the Forum, and Saturday evening during the Banquet.  

Stay tuned for more updates

QRP ARCI is a club for low power enthusiasts worldwide.

We produce a professional quality magazine (QRP Quarterly), organize an annual conference at Dayton ('Four Days In May' or FDIM), and sponsor various QRP contests and awards.

Our aim is to promote QRP and a variety of related activites. Many of our members enjoy home construction, kit building, antenna experimentation, backpacking and portable operation. Minimalist radios built in small tins are very popular but we also enjoy the very latest high performance radios such as the Elecraft KX3, the new SDR rigs, and great kits like the QCX from QRP Labs, kits from 4 States QRP Group, and the uBitx rigs. 

QRP-ARCI is an affiliated Club of the American Radio Relay League

Let us know if we can promote your club, group, kit or product.

A new Mail List has been started for QRPARCI on the groups.io platform.  This mail list is open to members and non-members alike for the discussion of QRPARCI topics.  QRP-ARCI Staff handles the moderation of the list and you can gain access by sending an email to This email address is being protected from spambots. You need JavaScript enabled to view it. and requesting to be added  to the mail list.  Be sure to add your callsign in the request. You can get your mail in digest form as well if you prefer it that way.   73 de ARCI Staff Moderators