CDXC: The UK DX Foundation



CDXC LF Challenge Rules

In the LF Challenge, the objective is to work as many DXCC’s as you can on 160m, 80m and/or 40m in the month of March.

All logs must be uploaded to Club Log; no paper or e-mailed logs will be accepted.  In keeping with recent rules changes in large contests, uploads need to be completed and the competition will be closed five days after the end of the Challenge period.


00:01 GMT 1st March  to 23:59 GMT 31st March


160m, 80m and 40m only


Any within your licence


Any within your licence


The LF Challenge is open to any licenced amateur world-wide but Awards (Trophies, Salvers and Certificates) are only available to those who are fully paid up members of CDXC for the full duration of the Challenge.

The LF Challenge is an individual operator competition.  Where an operator has multiple call signs, contacts with all call signs may be combined, but only if all of the call signs are used for single operator operation.  Call signs used or linked with multi-operator contest entries or multi-operator Special Event Call signs are not eligible for awards.

Unattended and/or semi or full automation of any QSO is not permitted.


Each DXCC entity worked is counted once only, regardless of how many bands or how many modes that entity is worked on.  The object is to work as many DXCC entities as possible.  In the event of a tie based on DXCC entities, the higher score by Band-Slots will win.

Log entry:

Via upload to Club Log and electing to enter the LF Challenge on the Club Log website. Regular uploading of your log during the month is encouraged – registration and at least one upload must be made by 15 March and once per week is preferred - as this helps to drive the Challenge and provides a spectator sport for all to see.  (If you are not QRV until after 15 March but would still like to take part, please send an email to the Awards Manager.)

E-mailed or paper logs will NOT be accepted.

To assist with adjudication, all entrants are encouraged to upload their log to LoTW and to do so within a week of the end of the Challenge.

Trophies, Salvers and Certificates will only be awarded to those who have uploaded their log to LoTW within three weeks of the end of the Challenge.

Log Verification:

No QSLs are required, but in the event of a question the CDXC committee may request verification via other means.  By entering, participants agree that their Club Log entries may be viewed and queried by adjudicators and that decisions made by the adjudicators will be final.

Closing date:

All logs must be uploaded to Club Log by 23:59 on 5th April following the Challenge period. Any uploads after this date will not be taken into consideration.


Awards include Trophies, Salvers and certificates. Trophies will be awarded for each of two modes: (i) CW and Phone (non-MGM) and (ii) Machine Generated Modes (MGMs). ‘MGM’ uses the IARU Region 1 MGM definition. RTTY and wsjt-x modes are MGMs. Digital voice counts as phone.


The Penallt Trophy (travelling cup), given in memory of Allan Phillips, GW0BIC, will be awarded to the CDXC member with the highest number of DXCCs worked using only non-MGM modes..

The Tindle Cup (travelling cup) will be awarded to the CDXC member with the highest number of DXCCs worked using only MGM modes.


The two Trophy winners and the CDXC member with the highest number of DXCCs on 160m, 80m and 40m (irrespective of mode) will each receive an engraved salver to keep.


Certificates of merit will be awarded to CDXC members placed runner up and third on non-MGM modes, MGM modes and on 160m, 80m and 40m (irrespective of mode).

Certificates will be e-mailed to winners prior to the following AGM date.


Each Trophy may be won by an operator only once in any three-year period.

Trophies and salvers will be presented at CDXC events throughout the year. Travelling Trophies and Cups will only be posted to members who agree to meet the full postage costs and who agree to return them at the time stipulated when awarded (usually nine months after award). Travelling Trophies and Cups will not be sent overseas (i.e. outside of UK).

CDXC especially acknowledges the contributions of Michael G7VJR in conceiving Club Log and providing it for use as a tool for this Challenge.

© CDXC - The UK DX Foundation. The aim of the club is to promote HF operating in Amateur Radio and to encourage excellence, particularly in DXing and contest operating.

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