Times Microwave LMRŽ-400Flexible Low Loss Coaxial Communications CoaxIdeal for…• Drop-in transmission line replacement for RG-8/9913 Air-Dielectric type Cable• Jumper Assemblies in Wireless Communications Systems• Short Antenna Feeder runs• Any application (e.g. WLL, GPS, LMR, WLAN, WISP, WiMax,SCADA, Mobile Antennas) requiring an easily routed,low loss RF cableSize for size LMR has the lowest loss of any flexible cableand comparable loss to semirigid hard-line cables. |
• RF Shielding is 50 dB greater than typical single shielded coax (40 dB). The multi-ply bonded foil outer conductor is rated conservatively at > 90 dB (i.e. >180 dB between two adjacent cables). • Weatherability: LMR-400 cables designed for outdoor exposure incorporate the best materials for UV resistance and have life expectancy in excess of 20 years. • Connectors: A wide variety of connectors are available for LMR-400 cable, including all common interface types, reverse polarity, and a choice of solder or nonsolder center pins. Most LMR connectors employ crimp outer attachment using standard hex crimp sizes. • Cable Assemblies: All LMR-400 cable types are available as pre-terminated cable assemblies. Refer to the section on FlexTech for further details. |
| • LMRŽ standard is a UV Resistant Polyethylene jacketed cable designed for 20-year service outdoor use. The bending and handling characteristics are significantly better than air-dielectric and corrugated hard-line cables. • LMRŽ- DB is identical to standard LMR plus has the advantage of being watertight. The addition of waterproofing compound in and around the foil/braid insures continuous reliable service should the jacket be inadvertently damaged during installation or in the future. • LMRŽ- FR is a non-halogen (non-toxic), low smoke, fire retardant cable designed for in-building runs that can be routed anywhere except air handling plenums. LMRFR has a UL/NEC & CSA rating of ‘CMR’ and ‘FT4’ respectively. In addition, the LMR-FR series is MSHA-P rated for mining operations. • LMRŽ- FR-PVC is a general-purpose indoor cable and has a UL/NEC & CSA rating of ‘CMR’ and ‘FT4’ respectively. It is less expensive than LMR-FR, however it emits toxic fumes (HCL) and greater smoke density when burned. • LMRŽ- PVC is designed for low loss general-purpose indoor/outdoor applications and is somewhat more flexible. |
I use LMR-400 on 3 antennas. A Comet CHA250B HF vertical, a Solarcon I-MAX 2000, and a Comet GP-15 tribander VHF/UHF antenna. I have tried every coax from Radio Shacks cheap stuff to the best that Belden and Jetstream offers. None of them can stand up to Times Microwave's LMR-400. There are cheaper imitators, but don't be fooled. They are not the exact same coax. TM's LMR-400 is the best, and worth every penny. The center conductor is solid aluminum with a heavy copper plating. A very low dielectric foam surrounds the center conductor. Thick foil is molded directly to the foam so it can't come loose, which gives the coax a virtual 100% shield, Then a thick braiding of tinned copper surrounds it all as a shield conductor. Only hard line is better, but not much better. It is a little stiff, and you must use extreme caution not to kink the coax anywhere along the length. You can not make sharp 90 degree bends, but you can make a subtle 90 degree curve with no problem. I even made an RF choke with it on my antennas. 6 or 7 turns about 9 inches across. Of all the coax I have tried, LMR-400 gives the lowest SWR on all 3 of my antennas, and allows them to be more broadbanded. This means virtually all of the RF power emits from the antenna, and NOT from the coax. And your antenna can use extreme frequencies with a lower SWR. I have used LMR-400 exclusively for several years now. I get absolutely no TVI, or RFI into any other electronics, on any part of the HF and VHF spectrum from any antenna. It is slightly thicker than typical RG-8U, so threading a standard PL-259 onto it is a bit tougher, but can be done. For the money, you can't beat LMR-400. Use it and you will not be sorry. |