Home > Antennas & Cables > TBS CROSSFIRE MOXON ANTENNA


Product #: 41570
Rs2,000.00 Price drop alert!
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Team black sheep been doing some great work lately with their new “crossfire” long range system. The current generation of 433MHz “LRS” have served us well, but where plagued by common issues. Notably, the on-board noise coming from different equipment within the aircraft. That super nice camera, with amazing colors, but cut your range completely, was typical of FPV flyers. GoPro™ and most, if not all others HD action cameras produce more or less noise right in the 433MHz band.

When I saw that the crossfire operate in the 900MHz region I was thrilled, I ordered one immediately. The amount of functionalities TBS packed inside is quite impressive, here’s some:

  • Telemetry downlink
  • Beacon mode with own internal lipo (diversity rx)
  • Automatic/manual tx power level (up to 2W)
  • 12ch support
  • OLED display for on-field configuration
  • Immune to on-board noise
  • Two rc models; diversity and micro (3.4g only!)
  • Plus many more and future features are just a software update away

Upon receiving my crossfire I proceeded to make a Moxon antenna for it:


The Moxon is a nicely compact linear antenna. Still, I modified the design to have a balun build-in. This keep cable interactions in-check for a more predictable radiation pattern (6dBi).

I then made a clean install on my futaba 12Z:


Power and signal where both wired internally. I added a JST port so an external lipo can supply the radio/crossfire as the stock Li-on is somewhat limited. Binding was straight forward and immediately 8 channels where available on the diversity rx. A quick tour in the crossfire tx back let me route the full 12ch PPM stream from my 12Z to channel #1 on the rx. That rx then went into my vector equipped quad copter.

Fail-safe was set and tested; Unplug power to the crossfire > fail-safe, plug power back > re-link immediately.

Simulating an out of range situation was a bit more difficult. I replaced the Moxon antenna by a dummy load and moved the radio as far as I could.  I did hit some brief fail-safe but could not get them to last, so I pulled the big gun. I powered my spectrum analyzer and set the tracking RF generator to output from 880MHZ to 950MHZ trough the Moxon antenna pointed at the rx. Link was still going strong. It show the crossfire’s excellent ability to hop around the tracking RF generator as the later never occupy the whole band, but rather sweep it many times a second. Setting the RF generator to occupy the whole band was the only way to break the crossfire’s radio link. This is by no way a scientific test, but it does make it ready for a test flight.



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