Cable
RG58
End A
RP-SMA MALE
End B
TNC MALE
Specs Summary
250 ft RG58 — RP-SMA MALE to TNC MALE
RG58 cable assembly, 250 feet, with RP-SMA MALE and TNC MALE connectors. Hand-assembled, tested, and ships free within the US.
250 ft — RP-SMA MALE / TNC MALE
$263.98
Free shipping • In stock
Other lengths:
Signal Loss — 250 ft
Approximate insertion loss for this 250 ft RG58 assembly at common RF frequencies.
| Frequency | Loss / 100 ft | Loss — 250 ft |
|---|---|---|
| 100 MHz | 4.3 dB | 10.75 dB |
| 450 MHz | 9.8 dB | 24.5 dB |
| 900 MHz | 14.3 dB | 35.75 dB |
| 1.8 GHz | 21.5 dB | 53.75 dB |
| 2.4 GHz | 25.5 dB | 63.75 dB |
| 5.8 GHz | 44 dB | 110 dB |
About This Assembly
RG58 Cable
RG-58 is a classic flexible 50-ohm coaxial cable with a 0.195" outer diameter, offering an excellent balance of flexibility and performance at a low cost. Its braided shield provides good EMI rejection and its thin profile makes it easy to route through tight spaces. Common applications include amateur radio, CB radio, networking equipment connections, and general-purpose RF jumpers up to 25 feet.
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.
TNC Connector
TNC (Threaded Neill–Concelman) is the threaded version of BNC, offering improved performance up to 11 GHz and better vibration resistance through its screw coupling. It is commonly used in mobile radio antennas, avionics, and outdoor installations where BNC's bayonet lock would not provide sufficient mechanical security.
Common Applications
This RP-SMA and TNC cable assembly is well suited for amateur radio, CB radio, and general-purpose RF patch cables. The combination of reliable RP-SMA and 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 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, RG58 loses approximately 21.5 dB per 100 ft. This 250 ft assembly will have roughly 53.75 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 – 1 GHz. The effective frequency limit is set by the lowest-rated component — either the cable or one of the connectors. Both RP-SMA MALE and 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.
