YO UHF-SHF Marathon it’s an international “OPEN” contest,  intending to promote activity on the SHF bands.

Who can participate?

Each and every ham radio with a valid license, who accepts the present set of rules. 

Contest days:

from April to November, every 3rd Sunday of each month .

The schedule for 2023:

Round 121.04.2024
Round 219.05.2024
Round 316.06.2024
Round 421.07.2024
Round 518.08.2024
Round 615.09.2024
Round 720.10.2024
Round 817.11.2024

 Round period: from 07:00 to 11:59 UTC


According to the IARU Region I band plan for the 23cm / 13cm / 6cm and 3cm band.

Entry categories:

  • SINGLE (single operator)
  • MULTI (multi operator)



  • Only one contact per band can be made with each station, regardless of working mode.
  • Only one signal/band is allowed at any time for one station.


  • RS or RST + serial number starting with 001 + QTH Locator (6 character).
  • Example: 59001 JN00XX
  • Each round will start with serial number 001.


  • For YO stations:  1 point/km, no multipliers
  • For other stations: 1 point/km x Multiplier

Multiplier: 1 + (Number of unique 4 character grid locators with YO stations worked (i.e. KN05, KN44, KN17, etc))

Final result:

  • Total aggregate score of all rounds
  • There will be four separate table of results:
    • YO single, YO multi, others single, others multi


  • Only electronic logs in EDI format are accepted.
  • The log must contain the following information:
    • Date (TDate)
    • Callsign (PCall)
    • QTH locator (PWWLo)
    • Category (PSect) SINGLE or MULTI Band (PBand)

Logs needs to be uploaded to the address: upload page in 7 days from the round end. Received logs will be displayed on the dedicated web section. Logs received after the deadline will be used as check-logs.


Any appeal should be sent to and will be settled in two days from the preliminary results display deadline.

Final results of each round and also the preliminary general results will be displayed after the appeal settling deadline, on

Final results:

After all rounds are finished, tables of results will be displayed for the following categories:

 YO stations:

  • – 1296 MHz SINGLE
  • – 1296 MHz MULTI
  • – 2300MHz SINGLE
  • – 2300MHz MULTI
  • – 5700 MHz SINGLE
  • – 5700 MHz MULTI
  • – 10368 MHz SINGLE
  • – 10368 MHz MULTI

Other stations:

  • – 1296 MHz SINGLE
  • – 1296 MHz MULTI
  • – 2300MHz SINGLE
  • – 2300MHz MULTI
  • – 5700 MHz SINGLE
  • – 5700 Mhz MULTI
  • – 10368 MHz SINGLE
  • – 10368 MHz MULTI


Every participant will be honored with electronic (downloadable) certificate.


All participants who sent logs will be listed in the results table. For QSO validation, additional check-logs will be used. These check-logs will be obtained, when possible, from the organizers of other contests taking place in the same time.

QSOs made with stations which haven’t sent logs, and their log was not obtained from organizers of other contests will be scored as follows:

  • zero points if the call is unique (can’t be found in any other logs)
  • if the worked call is present in other logs, the QSO is valid if:
    • the received serial number is correlated with the time of the QSO
    • the received QTH locator is the same as the one received by the majority


  • The call HA8XYZ appears in five received logs. If the serial number received from HA8XYZ is increasing with the time of the QSO on all available logs, the QSO with HA8XYZ will be valid
  • The call HA8XYZ appears in 10 received logs. In 8 logs received QTH is KN06LN, and in 2 logs received QTH is KN07LN. QTH KN06LN will be considered the correct one.

If the time difference is higher than 5 minutes, the QSO is scored 0 points.

The QSO will be scored 0 points for the participant who made this type of erorrs:

  • wrong serial number
  • wrong QTH locator

or incorrect callsign reception (with or without /p)

The preliminary results will be displayed in 15 days from the log sending deadline.

Final remarks:

  • Dupes are scored with zero points
  • Serial numbers out of sequence are not affecting score, if they are correct
  • Use of DX cluster is permitted, except self spots
  • Making skeds via is permitted and encouraged
  • log file name should be CALL_month_1926.edi (for example YO0XXX_4_1296.edi)