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BNC Male to 4mm Banana Jack Adapter Q9 Oscilloscope Terminal Block Jacks Insulated BNC Socket Straight Connector Pack of 2…
BNC Male to 4mm Banana Jack Adapter Q9 Oscilloscope Terminal Block Jacks Insulated BNC Socket Straight Connector Pack of 2…
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--- QUICK SPEC REFERENCE --- Product: BNC Male to 4mm Banana Jack (Female) Adapter SKU: OL-6290-2X Connector A: BNC Male (bayonet lock, center pin) Connector B: Dual 4mm Banana Jack (Female) Insulation: Insulated banana jacks Spacing: 19mm (0.75 inch) standard Applications: Oscilloscope probe, function generator, dipole antenna, QRP rig Quantity: 2 adapters per pack Price: $6.98 In Stock: Yes ---
This adapter converts a BNC male connector into two insulated 4mm banana jacks, allowing banana plug test leads, binding post probes, and speaker-wire style connections to interface with BNC-equipped oscilloscopes, function generators, and signal analyzers. The 19mm (0.75 inch) spacing between the two banana jacks is the standard spacing used by most test and measurement equipment binding posts, ensuring compatibility with standard stackable banana plugs and probe sets.
Common applications include connecting oscilloscope probes with banana plug tips to a BNC-input oscilloscope, interfacing a function generator's BNC output with binding post test fixtures, building simple dipole or T-antenna connections for HF receivers and QRP radio rigs using banana plugs as the antenna attachment point, and adapting BNC-terminated signal cables to binding post terminal blocks. The insulated banana jack design prevents accidental shorting between the two conductors when probes or leads are inserted.
The BNC male end plugs directly into any standard BNC female port — oscilloscope inputs, function generator outputs, signal generator ports, and BNC-terminated coaxial cable ends. The adapter does not include cables or banana plugs; it is the adapter body only. Banana plugs (4mm) are purchased separately and inserted into the two jacks on the adapter.
Frequently Asked Questions
19mm (0.75 inch) is the internationally standardized center-to-center spacing for dual banana plug connections used in electronic test equipment. This spacing is used on oscilloscope probes, multimeter leads, function generator binding posts, and power supply terminals worldwide. Adapters, leads, and probes built to this standard are interchangeable between equipment from different manufacturers — Fluke, Rigol, Siglent, Keysight, and Tektronix all use this spacing.
Yes. A simple dipole antenna consists of two wire elements — one connected to the center conductor of the feedline and one to the shield. This adapter allows you to connect bare wire ends or banana plug-terminated dipole elements directly to an oscilloscope's BNC input for signal observation, or to an SDR receiver for HF listening. Insert the dipole element wires into the two banana jacks and the BNC male end into the oscilloscope or receiver input.
Yes. QRP (low-power) radios often use BNC antenna connectors, and simple wire antennas or antenna tuners may use banana binding posts. This adapter bridges the two connection standards. At QRP power levels (up to 5W), the adapter's banana jack contacts handle the current without issue. For higher power levels (100W+), purpose-built high-power connectors are more appropriate.
This adapter has a BNC male end (center pin, external bayonet), which plugs into a BNC female port on equipment. The BNC Female to Dual Banana adapter has a BNC female end (center socket, internal bayonet), which accepts a BNC male cable plug. Choose this adapter (BNC Male to Banana Jack) when you need to plug directly into a BNC female equipment port. Choose the BNC Female version when you need to terminate a BNC male cable end into banana jacks.
Yes. The two banana jacks are electrically insulated from each other — one connects to the BNC center conductor (signal) and one connects to the BNC outer conductor (ground/shield). This insulation prevents accidental short circuits when inserting banana plugs. The insulated design is essential for use with oscilloscopes and sensitive measurement equipment where a short circuit on the input could damage the instrument.
Oscilloscopes and many signal analyzers have multiple BNC input channels. The 2-pack allows two channels to be simultaneously equipped with banana jack inputs — useful when comparing two signals from different circuit points using banana plug probes, or when running a differential measurement with one probe on each channel. A spare also protects against loss or damage in a busy test bench environment.
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