Description
Alfred 3DBM 654K-S1 Oscillator Plug-In 7.0-12.4 GHz RF Sampler X-Band Vintage
The Alfred 654K-S1 is an X-band RF oscillator plug-in module covering 7.0 to 12.4 GHz, manufactured by 3DBM INC. It is designed to slot into a compatible mainframe sweep or signal generator system, providing a swept or CW RF output signal across the X-band microwave frequency range. The front panel carries both leveled and unleveled RF output selection, a Lock indicator, an RF sampler port with internal/external switching, and a BNC RF output connector.
Specifications & What's Included
- Model: Alfred / 3DBM INC 654K-S1
- Frequency Range: 7.0 – 12.4 GHz (X-Band)
- RF Output: Leveled and Unleveled modes (selectable on front panel)
- RF Output Connector: BNC (front panel)
- RF Sampler Section: INT/EXT input switching (front panel)
- Lock Indicator: Front panel LED/lamp
- Calibrated Frequency Scale: Multi-row graduated scale on top of module, 7.0–13.0 GHz range visible
- Rear Interface: Two multi-pin edge connectors for mainframe chassis mating
- Form Factor: Plug-in module (requires compatible mainframe)
- Included: Plug-in module only — no mainframe chassis, cables, or accessories
Applications
X-band oscillator plug-ins like the Alfred 654K-S1 were used in swept-frequency microwave test systems during the 1960s and 1970s, an era when modular plug-in architecture was the dominant approach to microwave bench test equipment. These plug-ins slot into a mainframe that provided power, sweep drive, and display — allowing a lab to reconfigure its signal source simply by swapping plug-in modules for different frequency bands. The 7.0–12.4 GHz X-band coverage is relevant to radar cross-section testing, antenna characterization, microwave component and filter evaluation, and waveguide circuit development. Today, pieces like this are sought by vintage RF collectors, microwave historians, and engineers maintaining or restoring period test benches. The module's calibrated frequency scale, leveled output capability, and RF sampler port reflect the precision swept-frequency measurement practice of its era.
This Alfred 3DBM 654K-S1 X-Band Oscillator Plug-In (7.0–12.4 GHz) has been inspected and is in good used condition. The front panel label is clear and legible, the RF output BNC connector and RF sampler connectors appear intact, and the calibrated frequency scale on top is complete and readable across its full 7.0–12.4 GHz range. The chassis and panel show light surface wear and minor scuffing consistent with age and prior lab use — typical for vintage RF equipment of this era. The rear multi-pin connectors appear undamaged. This is a plug-in module only; no mainframe chassis or cables are included. Please view our photo set and contact us if you have any questions.
Warranty Information
Additional Information
Brand: |
Alfred / 3DBM INC |
Model: |
654K-S1 |
MPN: |
654K-S1 |
Type: |
RF Oscillator Plug-In Module |
SKU: |
18509 |
Frequency Range: |
7.0 – 12.4 GHz |
Frequency Band: |
X-Band |
RF Output Type: |
Leveled and Unleveled RF Output |
Features: |
RF Sampler section (INT/EXT input) |
Form Factor: |
Plug-In Module |
Connector Type: |
BNC (RF output); multi-pin rear connectors |
Condition: |
Used – Inspected, Good Condition |
Seller Notes: |
Plug-in module only; no mainframe or cables included |
Country/Region of Manufacture: |
United States |
Condition Notes: |
Alfred 3DBM 654K-S1 X-Band Oscillator Plug-In (7.0–12.4 GHz) inspected and in good used condition. Front panel, BNC and sampler connectors, and frequency scale intact. Light surface wear typical of age. Plug-in module only; no mainframe included. |
