Cable
RGU178
End A
RP-SMA FEMALE
End B
RP-TNC MALE
Specs Summary
25 ft RGU178 — RP-SMA FEMALE to RP-TNC MALE
RGU178 cable assembly, 25 feet, with RP-SMA FEMALE and RP-TNC MALE connectors. Hand-assembled, tested, and ships free within the US.
25 ft — RP-SMA FEMALE / RP-TNC MALE
$32.82
Free shipping • In stock
Other lengths:
Signal Loss — 25 ft
Approximate insertion loss for this 25 ft RGU178 assembly at common RF frequencies.
| Frequency | Loss / 100 ft | Loss — 25 ft |
|---|---|---|
| 100 MHz | 9 dB | 2.25 dB |
| 450 MHz | 19.5 dB | 4.88 dB |
| 900 MHz | 28.5 dB | 7.12 dB |
| 1.8 GHz | 41 dB | 10.25 dB |
| 2.4 GHz | 48 dB | 12 dB |
| 5.8 GHz | 78 dB | 19.5 dB |
About This Assembly
RGU178 Cable
RGU-178 is an ultra-flexible variant of the RG-178 coaxial cable, retaining the 1.75mm form factor while featuring a stranded center conductor and flexible jacket for repeated bending. It excels in applications requiring both a small footprint and mechanical durability, such as wearable devices, rotating joints, and flexible test leads.
RP-SMA Connector
RP-SMA (Reverse Polarity SMA) uses the SMA threaded coupling mechanism but with the male/female pin convention reversed — the jack has a pin and the plug has a socket. Originally standardized to prevent connection of uncertified antennas to consumer WiFi equipment, RP-SMA is now the dominant connector on commercial WiFi routers, access points, and 2.4/5 GHz antennas.
RP-TNC Connector
RP-TNC (Reverse Polarity TNC) uses the TNC threaded shell with reversed pin conventions, similar to RP-SMA. It is used on some commercial WiFi access points and outdoor CPE antennas, particularly in older Cisco and Linksys equipment, and offers better vibration resistance than RP-SMA in demanding outdoor environments.
Common Applications
This RP-SMA and RP-TNC cable assembly is well suited for flexible pigtails for compact modules and repeated-bend applications. The combination of reliable RP-SMA and RP-TNC 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.
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 25 ft?
Yes. This page is for the 25 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 25 ft cable?
At 1800 MHz, RGU178 loses approximately 41 dB per 100 ft. This 25 ft assembly will have roughly 10.25 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 – 6 GHz. The effective frequency limit is set by the lowest-rated component — either the cable or one of the connectors. Both RP-SMA FEMALE and RP-TNC MALE 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.
