Our X-400 coaxial cable is perfect for applications on the 868Mhz and 915Mhz bands. The ultra low attenuation of <0.193dB per metre between DC and 3GHz means that almost no signal is lost in the cable. The tough PE jacket resists UV and provides excellent durability in harsh environments.
This cable is a direct replacement for RG-8, LMR-400 (a trademark of Times Microwave), and other 0.400" / 10mm jacketed low-loss coaxial cables.
We recommend this cable for any 868MHz or 4G/5G radio system as the highest performing cable that's a reasonable thickness and relatively easy to bend.
Please note this cable is very stiff, and intended for permanent installations. You will need appropriate cable support or clips.
Installation note: It's critical that all outdoor connectors are taped with self-amalgamating tape (not electrical tape)! Water will seep through screw threads over time, and will permeate your cable and antenna via the exposed connectors, causing performance to mysteriously drop some days or weeks after installation.
RP-SMA vs SMA connectors
The RP-SMA connector is a similar, but incompatible, connector to the SMA connector. Be sure to check the identification chart below to determine which type you need.
We offer this cable with an adapter from RP-SMA to SMA, so you have a choice of
- N-male to RP-SMA male connectors (cable alone)
- N-male to SMA male connectors (cable + adapter)
If in doubt, please select this option. This bundle can also be a cost-effective alternative to our N-SMA cables!
SMA and RP-SMA connector identification chart
| Generic name | X-400 |
| Connector A | N-male (suits our range of outdoor antennas) |
| Connector B | RP-SMA male (suits most Helium / HNT miners) |
| Length | 15m |
| Insertion loss |
≤0.193dB per metre @ 868MHz;
≤0.132dB per metre @ 433MHz; |
| Impedance | 50 Ohm |
| Capacitance | 79pF +/- 2pF per metre |
|
|
0.82 |
| Conductor | Copper-clad aluminium, 2.74mm |
| Shield | Aluminium foil + braiding |
| Dialectric isolation | >3000V |
| Dialectric | Foam PE |
| Jacket | PE |
| Working temperature | -40℃ to +85℃ |
| Minimum bend radius | 103mm |
| Diameter | 0.405" or 10.3mm |
- Please note that this cable is quite stiff, and should not be bent repeatedly or installed in a location where it can move (eg, unsecured and in the wind) as the central conductor will be damaged.
- Do not bend tighter than the outside of a frisbee (103mm is the minimum bend radius), or kink.
- Secure cable to a solid object every 500mm, and wrap all connections in self-amalgamating tape.