4.9µH Large Air-Core RF Coil / Inductor
$15.00
Large air-core RF coil / inductor measuring approximately 4.9µH, suitable for RF repair work, ham radio projects, CB radio service, vintage radio restoration, antenna matching experiments, RF filter work, oscillator circuits, tank circuits, donor-board replacement, and electronics bench stock.
This is a large open air-wound copper coil with formed through-hole style leads and low measured winding resistance. The coil was bench checked for DCR continuity and measured for inductance using a DER EE DE-5000 LCR meter.
Historical Note:
Air-core coils have long been used in RF circuits because they avoid ferrite/core saturation and can provide stable inductance in tuning, filtering, oscillator, matching, and RF tank applications. Larger air-core coils are commonly found in communications equipment, CB radios, ham gear, vintage receivers, transmitters, antenna networks, and experimental RF bench projects.
Origin Tracker
Donor Pull
Recovered from donor equipment for reuse in radio repair, restoration, or parts recovery work.
Pipeline quantities are informational and may change after arrival, inspection, sorting, testing, or donor teardown.
Compatible Radios / Boards
Suitable for RF repair, ham radio equipment service, CB radio repair, vintage radio restoration, antenna matching networks, RF filters, oscillator circuits, tank circuits, receiver/transmitter projects, experimental RF bench work, donor-board replacement, and general inductor stock where an approximately 4.9µH large air-core coil is required.
Buyer should confirm inductance value, physical size, lead spacing, wire gauge, current requirement, circuit position, and tuning requirements before installation. This coil was measured as a loose part and was not aligned or RF swept in a finished circuit.
RF Boneyard Bench Notes
Tester / Method:
DER EE DE-5000 LCR meter
Bench Measurements:
Meter Mode: Ls
Measured Inductance: 4.9µH
DCR / Winding Resistance: 0.14?
Continuity: Confirmed
Test Frequency: Not recorded
RF Sweep / Q Test: Not performed
In-Circuit Alignment: Not performed
Bench Evaluation:
PASS - Coil winding continuity confirmed.
PASS - DCR / winding resistance measured 0.14?.
PASS - Inductance measured 4.9µH in Ls mode on DER EE DE-5000 LCR meter.
PASS - Physical inspection completed; coil body and leads appear usable for bench repair/restoration stock.
PASS - Suitable for RF repair, ham radio, CB radio, vintage radio restoration, donor-board replacement, and electronics bench inventory.
PASS - Ohms reading is DCR / continuity only and is not the inductance value.
PASS - Not RF swept, Q-tested, or aligned in-circuit.
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