Makrothen Contest Rules

Makrothen (Makrovqen) is an ancient Greek word and means “great distance” or “some distance away”.

Date and Time

The contest takes place on the second full weekend of October each year. The next contest dates are Saturday 10th and Sunday 11th October 2015, with three separate periods: Saturday 00:00-08:00 UTC and 16:00-24:00 UTC and Sunday 08:00-16:00 UTC.


The object of the contest is for amateurs around the world using RTTY to contact as many amateurs in other parts of the world as possible during the three contest periods.

Terms of Competition for all classes

All entrants must operate within the limits of their chosen class when performing any activity that could impact their submitted score. Only the entrants callsign can be used to aid the entrants score. A station operating from a DXCC Entity different from that indicated by its callsign is required to sign portable (i.e.: KH6XYZ/W2 or GM/G1XYZ).

All antennas must be physically connected by wires to the transceiver/s, transmitter/s and receiver/s used by the entrant. All used transceivers, transmitters and receivers must be located within a 500 meter diameter area or within property limits of the station licensee, whichever is greater. All operation must take place from the same operating site.

Any form of DX alerting assistance is permitted in all classes. Self spotting of any form on spotting nets is not permitted for any class. Self spotting is defined as generating packet radio or web site spots for your contest callsign, including – for example – this methods: using your own callsign; spotting your callsign while using another callsign; spotting of your callsign by other stations as a result of prearranged solicitation. To notify the locator of a station via any form of DX alerting assistance is unwanted and this unsportsmanlike behaviour can lead to a disqualification.

Classes (For your log: see also “Log Templates” on the TMC Web Site)

Class 1: Single, All Band, Low Power (SINGLE-OP ALL LOW)

  • SO/Single Xcvr LP

Class 2: Single, All Band, High Power (SINGLE-OP ALL HIGH)

  • SO/Single Xcvr HP

Class 3: Multi, All Band, Low Power (MULTI-MULTI ALL LOW)

  • SO/Multi  Xcvr LP (S/M)
  • MO/Single Xcvr LP (M/S)
  • MO/Multi  Xcvr LP (M/M)

Class 4: Multi, All Band, High Power (MULTI-MULTI ALL HIGH)

  • SO/Multi  Xcvr HP (S/M)
  • MO/Single Xcvr HP (M/S)
  • MO/Multi  Xcvr HP (M/M)

Class 1 and 3: The output power shall not exceed 100 watts.

Class 1 and 2: Single operator and single transceiver – or – single transmitter and single receiver.

Class 3 and 4:

S/M = Single operator and multiple transceivers, transmitters and receivers (see note).
M/S = Multiple operator and single transceiver – or – single transmitter and single receiver.
M/M = Multiple operator and multiple transceivers, transmitters and receivers (see note).

Note: No limit to transceivers, transmitters and receivers, but only one signal and running station allowed per band.


The 80, 40, 20, 15 and 10 meter bands may be used only.


No RST required. You have to send the first 4 characters of the “Maidenhead Grid Square Locator” (locator) at your QTH. (i.e.: FM19 or: JO41). Your log must show the correct locator sent and received for each contact. You must send the same locator in each QSO. Only portable “/p“, mobile “/m“, maritime mobile “/mm” and marine stations (example: “VEØ***”, “HC9***”) may change their locator every 60 minutes.

QSO Points

A station may be worked once on each band for QSO points credit. The points for the QSO are equal to the distance in kilometer (rounded to an integer value) between the two stations exchanging their locator. IOW: one point is equal to one kilometer.

Points on the lower bands: For a QSO on 40m you must multiply the “points per kilometer” with the factor 1.5 and for a QSO on 80m you must multiply the “points per kilometer” with the factor 2.0. The result must be rounded to an integer value.

Special case – Exception: If both stations are located in the same square, then both stations – regardless of the band – get 100 points for this QSO finally. Don’t multiply this 100 points with any band factor!


The calculation of the distance should assume the earth is a perfect sphere with a radius of 6378.16 km. The base point for the distance calculation is the center of the Maidenhead Grid Square.

The formula

distance = acos(cos(a1) x cos(b1) x cos(a2) x cos(b2) + cos(a1) x sin(b1) x cos(a2) x sin(b2) + sin(a1) x sin(a2)) x radius

a1 = latitude of station-1
b1 = longitude of station-1
a2 = latitude of station-2
b2 = longitude of station-2

Please note: a1, b1, a2, b2 in radians

radians = degrees x PI / 180

PI = 3.1415926535897932384626433832795

The distance must be rounded to an integer value.


No multipliers. IOW: No multiplier for a continent, a country, an area, etc.


Your total score is the total sum of total points of each band. For each valid QSO the distance and the points and the final total score will be calculated by the official log checker! You should have this in your mind, if your logging software package does not support the TMC distance and calculation method or calculates the distance with an other radius of the earth, etc. ..!

Log Submission

Do not remove duplicates from your log, as there is no penalty for duplicate contacts.

Logs should be submitted by email to Scott, MM0LID: < >.

Logs in CABRILLO format are preferred!

If your received log is accepted you will find your callsign in a list provided on the TMC Web Site. See “Received logs“. But have in your mind: TMC does not use a mail robot!

Logs should be sent as plain text as an attachment only named “<yourcall>.log” eg “DK3VN.LOG” (HB9/DK3VN => HB9-DK3VN.LOG or DK3VN/P => DK3VN-P.LOG). Also the email should be formated in plain text (ASCII) and not in HTML-Code.

If you have participated in one of the Multi classes, put a remark in the SOAPBOX also, like: SO/Multi, MO/Single, MO/Multi. Then your entry in the result list will be marked with it.

If your logging software package does not have Cabrillo capability, then you may send your log in plain text format also. In both cases (Cabrillo or any other format) check out the log templates on the TMC Web Site!

All logs must be received by 17th October 2016 in order to qualify.

For more information check out the log templates on the TMC Web Site. Any incomplete entries will be classified as check logs. The judges decision will be final.

Club Competition

Every club may enter the Club Competition. The name of the club must be clearly identified in the header of the Cabrillo log or summary sheet. Check out the TMC Web Site for more information. Club Competition is “for fun” to foster more activity. There is a separate listing for club scores.


Violation of amateur radio regulations in the country of the contestant, or the rules of the contest, unsportsmanlike conduct, taking credit for excessive unverifiable QSO’s or sent an illogical “Maidenhead Grid Square Locator” will be deemed sufficient cause for disqualification.


For each class the top three stations will be awarded with a “World-Certificate”. Additional per each Continent each top station in each class may be awarded with a “Continent-Certificate”. If a continent has one or more “World-Certificate” winner, then for this continent no additional “Continent-Certificate” will be awarded.

The TMC definitions of Continents are: Africa, Antarctica, Asia, Europe, North America, South America and Oceania.


This contest is supported by Waldemar DK3VN and a group of international friends.
(Makrothen Contest Group / MCG)