ARRL DXCC ENTITY RE-EVALUATION MEMORANDUM – CU

CU — AZORES ISLANDS
Evaluation Under 1947 ARRL DXCC Rules

I. PURPOSE

This memorandum evaluates whether CU — Azores Islands qualified as a separate ARRL DXCC Entity under the 1947 ARRL DXCC Rules, the ruleset that defined the first stable post-WWII DXCC List.

The evaluation includes:

• The Azores’ political status as a Portuguese overseas district (1947)
• ARRL’s 1947 geographic “detached island group” criteria
• Great-circle separation from mainland Portugal
• Island-group distinctiveness
• Prefix identity and radio administration
• Whether the Azores met all DXCC requirements for recognition as a separate geographic entity

CU is the DXCC prefix assigned to operations from the Azores archipelago.

II. BACKGROUND

Political & Administrative Status (as of 1947)

In 1947, the Azores were:

• An overseas autonomous district of the Portuguese Republic
• Administered under Portuguese law but geographically and operationally distinct
• Not a sovereign nation
• Not a colony in the classic sense; instead, part of metropolitan Portugal with overseas-district status
• With their own civil district administration based in Ponta Delgada, Angra do Heroísmo, and Horta (the three traditional island “capitals”)

Thus the Azores do not qualify as a Political Entity under 1947 rules.

Geographic Characteristics

The Azores archipelago consists of nine major islands divided into three island groups:

• Eastern Group — São Miguel, Santa Maria
• Central Group — Terceira, Graciosa, Pico, Faial, São Jorge
• Western Group — Flores, Corvo

Key geographic characteristics:

• Located approximately 1,360 km (845 miles) west of mainland Portugal
• Situated on the Mid-Atlantic Ridge, not the European continental shelf
• A completely isolated Atlantic archipelago
• No intermediate islands belonging to Portugal between the Azores and the mainland

These features made the Azores one of the most geographically distinct DXCC island groups of the era.

DXCC Prefix Identity

• The Azores have long used the CU prefix block
• Distinct from:
– CT (mainland Portugal)
– CT3 (Madeira)

The prefix assignment reflects ARRL’s pre-1950s policy of recognizing clear offshore island groups.

DXCC Context (1947)

The 1947 ARRL DXCC Rules recognized a Geographic DXCC Entity when:

An island or island group is clearly detached from its parent country
The detachment is of a substantial distance, even though no minimum was defined
The island group is permanently above water
It is an identifiable geographic unit
Amateur radio operation is possible

No minimum-distance rule, no intervening-entity rule, and no continental-shelf rule existed in 1947.

The Azores satisfy this system perfectly.

III. ANALYSIS UNDER THE 1947 DXCC RULES

1. POLITICAL ENTITY CRITERIA (1947) — FAIL

Political qualification required:

• Sovereignty
• Independent government
• International recognition

The Azores were not sovereign and thus cannot qualify politically.

2. GEOGRAPHIC ENTITY CRITERIA (1947) — PRIMARY QUALIFICATION PATH

2(a) Permanently Above High Tide — ✔ PASS

• All islands of the Azorean archipelago are major volcanic landmasses
• Fully emergent and inhabited

2(b) Substantial Distance From Parent Country — ✔ PASS

• ~1,360 km (845 miles) from mainland Portugal
• One of the greatest separations of any European-affiliated island group
• Exceeds the separation of Madeira (~870 km)

Under 1947 norms, this was unquestionably “substantial.”

2(c) Detached Island Group — ✔ PASS

• Located in the mid-Atlantic far from Europe
• No stepping-stone islands link Azores to Portugal
• Independent oceanic ridge formation

2(d) Distinct Geographic Identity — ✔ PASS

• Three distinct sub-archipelagos forming a single unified geographic unit
• Recognized as a separate Atlantic island region in all geographic and political atlases of the time

2(e) Amateur Radio Operability — ✔ PASS

• Active and potential amateur stations existed
• Operation was fully feasible in 1947

Conclusion:
The Azores meet all 1947 Geographic DXCC criteria.

3. SPECIAL-AREA CRITERIA (1947) — NOT APPLICABLE

The Azores were not:

• A UN trust territory
• A mandate
• A protectorate
• An international zone
• A polar region

Thus §3 does not apply.

4. 1947 DELETION CRITERIA — NOT TRIGGERED

Deletion would require:

Loss of geographic distinctness, or
Evidence the original listing was erroneous

Neither applied:

• The Azores remained geographically remote
• Their inclusion as a geographic entity was fully consistent with ARRL practice
• The CT → CU separation continued uninterrupted

V. FINAL DETERMINATION

✅ CU — AZORES qualifies as an ARRL DXCC Entity under the 1947 DXCC Rules.

Qualification Basis (1947):

✔ Classic “detached island group” under 1947 ARRL criteria
✔ ~1,360 km offshore from mainland Portugal
✔ Distinct mid-Atlantic geography
✔ Long-recognized separate prefix block (CU)
✔ Fully aligned with 1947 DXCC geographic-entity treatment
✔ Comparable to Madeira (CT3), Canary Islands (EA8), Fernando de Noronha (PY0F), and Bermuda (VP9)

Conclusion:
Under the 1947 ARRL DXCC Rules, CU — Azores is a strong, fully compliant Geographic DXCC Entity, qualifying clearly due to geographic separation.

VI. SUMMARY TABLE

Rule (1947)	Pass/Fail	Notes
Sovereign State	❌	Portuguese territory
Independent Government	❌	Overseas district
International Recognition	❌	Not sovereign
Above High Tide	✔ PASS	Nine volcanic islands
Substantial Distance	✔ PASS	~1,360 km from Portugal
Detached Island Group	✔ PASS	Entirely mid-Atlantic
Prefix Identity	✔ PASS	CU
Deletion Criteria	Not Triggered	Geographic isolation unchanged
Final Status	VALID GEOGRAPHIC ENTITY (1947)	Classic detached island group

References

ARRL DXCC Rules, Post–World War II Edition (1947)
Clinton B. DeSoto, W1CBD, “How to Count Countries Worked, A New DX Scoring System,” QST, October 1935
ARRL DXCC Country Lists, late-1930s through late-1940s editions
Nautical and geographic charting of the Azores Archipelago (pre-1950)
Early DXCC precedent involving Atlantic island groups administered by European states