LMR®-400 N-Female to SMA-RP-Male
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LMR®-400 N-Female to SMA-RP-Male


  • LMR®-400 NF – SMA-RP Male
  • Low loss Helium Interconnect
(4 customer reviews)

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LMR®-400 Helium Hotspot Antenna Cable | Best Quality, Better returns

The Times Microwave LMR®400 cable will absolutly boost the RF signal range and coverage for the Helium Hotspots like COTX-X3, HNT Nebra, Rak Helium Hotspots.

The LMR®-400 assembled cables ensure a fast return on investment, due to there low-loss build and high quality components. Due to the recent changes in regulatory there is nothing more important than lowering the cable loss as much as you can. Every dBm of  signal loss you want to eliminate. This cable offers you the best performance for your HNT Helium Mining Hotspot.


N-Female to SMA-RP-Male High Quality connectors

This cable is suited with the highest quality N-Female and SMA-RP-Male connector and connects a N-Male Antenna to a SMA-RP Female Hotspot. Not sure if your hotspot if SMA or RP-SMA? Use the picture below for reference;










LMR®-400 Helium Hotspot Antenna Cable | Low Loss Helium Connection

Due to the new restrictions all hotspots have a lower power output range than before. In Europa this limitation has been set to 25mw / 14dbm. This makes it clear that a high quality antenna cable is more important than ever. The LMR®-400 is designed to eliminate as much db loss as possible.

You can calculate your loss here : Times Microwave Systems Cable Loss Calculator.


LMR®-400 Helium Hotspot Antenna Cable vs Regular Coax RG Cable Assemblies

To give you some insight in the difference between the LMR-400 antenna cable vs regular coax rg cables here is some comparison.

  • The cable loss of a regular RG-58 over 10 meter (EU 868) is 5.2dB (that is 56.4% efficiency)
  • The cable loss of the LMR-400 Helium antenna cable over 10 meter (EU 868) is 1.4db (74.8% efficiency)

The difference is 3.8dB over 10 meters, as you can see it is so important to pick the best possible cable for your helium hotspot setup.


Waterproof connectors

All connectors are waterproof if you connect them the way it should. But we highly suggest using waterproof tape around the connection to prevent any moisture and rain that could weaken the cable.

Additional information


1M, 2M, 4M, 6M, 10M, 12M

Suitable for

Bobcat, COTX, Heltec, Linxdot, Nebra, RAK / MNTD, SenseCAP M1


Times Microwave Systems

4 reviews for LMR®-400 N-Female to SMA-RP-Male

  1. Mohamed Zerouali (verified owner)

    I ordered an lrm400 cable, and received it quickly at home as promised, recommended

  2. Ilja S. (verified owner)

    Fast shipping, great service. Always fast answer on discord. Quality products for best prices in EU. 10/10

  3. Maurice (verified owner)

    Perfect quality cable. Fast and decent shipping and communication. Dont forget this cable isnt much flexible.

  4. David (verified owner)

    Quality cable and fast shipping.

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