Description
Singer Stoddart NM-65T Radio Interference Analyzer Receiver 1-10 GHz EMI RFI
The Singer Stoddart NM-65T is a benchtop radio interference analyzer and EMI receiver covering 1 to 10 GHz, manufactured by the Ailtech Division of Cutler-Hammer in Los Angeles, California. It is designed to measure conducted and radiated RF interference signals in compliance with military and commercial EMI test specifications. The NM-65T uses a superheterodyne receiver architecture with a logarithmic IF amplifier, providing a calibrated analog meter display in microvolts, dB referred to 1 µV, and -dBm.
Specifications & What's Included
- Model: NM-65T (Ailtech Division, Cutler-Hammer)
- Frequency range: 1 to 10 GHz
- Frequency sub-bands: 1.0–2.2 GHz, 2.2–5.0 GHz, 5.0–10.0 GHz (front-panel selector)
- IF bandwidths: 0.1 MHz, 0.5 MHz, 5 MHz (switchable)
- Attenuator: X1 (0 dB), X10 (20 dB), X100 (40 dB), X1000 (60 dB) — three 20 dB steps
- Overall measurement range: 120 dB
- Meter scales: Microvolts, dB referred to 1 µV, –dBm
- IF amplifier: Logarithmic, 60 dB dynamic amplitude display range on panel meter
- RF input connector: N-type (front panel)
- IF output: BNC (side panel)
- Video outputs (BNC, side panel): Stretched Linear, Linear, FM, LOG
- XY recorder outputs: Y Output, X Output (BNC)
- X Mode: Single Band / Multiple Band (switchable)
- Audio demodulation: FM, AM, AM Stretch
- AFC (Automatic Frequency Control): On/Off
- Fine Tune: front-panel control
- Function modes: Direct, Slideback Peak, Peak
- Peak Hold: 1 sec / 0.3 sec
- Linear IF Gain: Manual control
- Power: AC mains or internal rechargeable battery (RECHARGE/OPERATE switch on meter)
- Calibration chart (Ornel Labs, Canoga Park, CA) attached to front panel
- Country of manufacture: USA
- Unit only — no accessories, manual, or cables included
Applications
The NM-65T belongs to the Singer Stoddart line of precision EMI receivers that were widely used for military and commercial electromagnetic compatibility (EMC) compliance testing from the 1960s through the 1980s. These instruments measure the amplitude of unintentional radio frequency emissions from electronic equipment and systems, verifying compliance with standards such as MIL-STD-461 and its predecessors (MIL-I-6181, MIL-I-11748, MIL-STD-826) as well as commercial FCC and CISPR specifications. The 1–10 GHz coverage makes the NM-65T suitable for measuring radiated emissions from microwave-frequency sources including radar subsystems, communications equipment, and high-speed digital electronics. The multiple video outputs allow the signal to be fed to an external oscilloscope, X-Y recorder, or spectrum display for documentation. The built-in battery operation capability was valued for field measurements and shipboard use where clean AC power was not always available. Today these instruments are used in legacy EMC labs, military depot maintenance, and by collectors and researchers working with vintage EMI test setups.
This Singer Stoddart NM-65T Radio Interference Analyzer/Receiver has not been powered up or tested at our facility, but it was pulled from a working operational environment where it was previously in service. The front and rear panels are intact with all knobs, switches, and BNC connectors present. The unit shows typical aging and surface wear consistent with its vintage — some scuffing and light oxidation on the painted steel chassis — but there is no obvious physical damage. A calibration chart from Ornel Labs is still attached to the front panel. Please view our photo set and contact us if you have any questions.
Warranty Information
Additional Information
Brand: |
Singer Stoddart |
Model: |
NM-65T |
MPN: |
NM-65T |
Secondary Model: |
Ailtech NM-65T |
Manufacturer Division: |
Ailtech Division, Cutler-Hammer, Los Angeles, CA |
Type: |
Radio Interference Analyzer / EMI Receiver |
SKU: |
25023 |
Seller Notes: |
Unit only — no accessories, manual, or cables included. |
Country/Region of Manufacture: |
United States |
Frequency Range: |
1 to 10 GHz |
Frequency Sub-Ranges: |
1.0–2.2 GHz, 2.2–5.0 GHz, 5.0–10.0 GHz |
IF Bandwidth: |
0.1 MHz, 0.5 MHz, 5 MHz (switchable) |
Attenuator Range: |
0 dB to 60 dB (X1, X10, X100, X1000 steps) |
Dynamic Range: |
120 dB total measurement range |
Meter Scales: |
Microvolts, dB ref 1 µV, -dBm |
RF Input Connector: |
N-type (front panel) |
Video Outputs: |
Stretched Linear, Linear, FM, LOG (BNC) |
XY Outputs: |
Y Output, X Output (BNC) |
IF Output: |
BNC |
Audio Demodulation: |
FM, AM, AM Stretch |
AFC: |
On/Off switchable |
Fine Tune: |
Yes |
Peak Hold: |
1 sec / 0.3 sec |
Function Modes: |
Direct, Slideback Peak, Peak |
Power Source: |
AC mains or internal battery (rechargeable) |
Form Factor: |
Benchtop / Rackmount |
Application: |
Military and commercial EMI/EMC compliance testing |
Standards: |
Military and commercial EMI test specifications |
Calibration: |
Ornel Labs calibration chart attached to unit |
Condition Notes: |
Singer Stoddart NM-65T EMI Receiver pulled from a working environment, not tested at our facility. All knobs, switches, and BNC connectors appear intact. Shows typical wear and surface aging. No obvious damage. Please view photos. |
California Prop 65 Warning: |
WARNING: This product can expose you to chemicals including lead and lead compounds, and DEHP (a phthalate), which are known to the State of California to cause cancer and birth defects or other reproductive harm. Go to P65Warnings.ca.gov |
