250 ft RG400 — FME FEMALE to N FEMALE
Cable
RG400
End A
FME FEMALE
End B
N FEMALE
Specs Summary
250 ft RG400 — FME FEMALE to N FEMALE
RG400 cable assembly, 250 feet, with FME FEMALE and N FEMALE connectors. Hand-assembled, tested, and ships free within the US.
$689.88
✓ In stock • Ships next business day
Made in USA
Other lengths:
About This Assembly
RG400 Cable
RG-400 is a double-shielded, silver-plated PTFE coaxial cable built to MIL-C-17 specifications with a 0.195" outer diameter. Its construction mirrors RG-142 but with two braid shields for even greater shielding effectiveness. The standard cable for military and avionics applications requiring certified materials and traceable performance.
FME Connector
FME (For Mobile Equipment) is a miniature threaded RF connector designed for mobile and vehicle-mounted antenna applications, particularly at GSM, CDMA, and FM frequencies. Its small size and robust threaded coupling make it common on vehicle-mount antenna mounts, cellular signal boosters, and mobile broadband modems.
N Connector
Type N is a threaded RF connector rated from DC to 18 GHz with a durable weatherproof design, making it the preferred interface for outdoor antenna installations, cellular base stations, and commercial wireless infrastructure. Its larger size compared to SMA allows higher power handling and the threaded coupling resists vibration, making it suitable for mobile and fixed outdoor applications.
Common Applications
This FME and N cable assembly is well suited for military-spec RF interconnects and avionics signal routing. The combination of reliable FME and N connectors and custom-cut cable length makes it a practical choice for both field installations and bench setups. Every assembly is hand-terminated, continuity tested, and ships free within the USA.
Signal Loss — 250 ft
Approximate insertion loss for this 250 ft RG400 assembly at common RF frequencies.
| Frequency | Loss / 100 ft | Loss — 250 ft |
|---|---|---|
| 100 MHz | 3.5 dB | 8.75 dB |
| 450 MHz | 7.8 dB | 19.5 dB |
| 900 MHz | 11.5 dB | 28.75 dB |
| 1.8 GHz | 17 dB | 42.5 dB |
| 2.4 GHz | 20 dB | 50 dB |
| 5.8 GHz | 34 dB | 85 dB |
Frequently Asked Questions
Is this cable hand-assembled in the USA?
Yes. Every CoaxRF cable assembly is hand-terminated and continuity tested at our US facility before shipping. We do not drop-ship pre-made cables from overseas — each cable is built to order.
Can I order a different length than 250 ft?
Yes. This page is for the 250 ft assembly. Use the length buttons above to select a different standard length, or use the Cable Builder for any custom length.
How much signal loss will I see with this 250 ft cable?
At 1800 MHz, RG400 loses approximately 17 dB per 100 ft. This 250 ft assembly will have roughly 42.5 dB of insertion loss at that frequency. See the signal loss table for all frequency points.
What is the maximum frequency for this assembly?
This assembly is rated DC – 2 GHz. The effective frequency limit is set by the lowest-rated component — either the cable or one of the connectors. Both FME FEMALE and N FEMALE connectors must be within spec at your target frequency.
What is your return policy?
We accept returns within 30 days of delivery. Custom-length cables are accepted as long as they are in original condition. Contact us and we will provide a prepaid return label at no charge.
