Please note - this article is still under construction, so bear with us!

• Is it getting power?

  • Check the power supply is connected and switched on.
  • If the front panel of the modulator is flashing, it may indicate a power problem.
  • If the power supply is external (i.e. plug pack), then try a replacement with the same specs.
  • If the power supply is internal, please contact us for repair or replacement options.

• Is it producing any kind of RF output?

  • Disconnect the modulator from its input device (i.e. disconnect the HDMI/AV lead from the source), and the modulator should produce an RF test channel (i.e. green screen, green with hum bars, test colour bar pattern, etc.) on the output channel indicated on the front panel. 
    • If the test pattern is visible on the TVs, and/or on your digital signal strength meter, then there's either a problem with the cable to the source, or with the resolution/frame rate of the source device.
    • If the test pattern isn't visible on the TVs, but is on your digital signal strength meter, it may indicate that your TVs aren't all MPEG4 capable. Please use set top boxes, replace the TVs with newer models, or use an MPEG2 modulator. More on that here: https://support.radioparts.com.au/hc/en-us/articles/360055600091
    • If there is no RF output visible on your digital signal strength meter, then either the output has been switched off in the modulator, or the modulator has a fault and needs to be repaired/replaced.

• Is the modulated signal too strong or too weak?

  • Check the output with your digital signal strength meter - both at the back of the modulator and at the TV point.
  • Modulators launch at high signal levels (85dBμV or higher), so they need to be matched (within ~5dBμV) to the signal level of the free-to-air signals at the TV points to avoid problems with the TV tuners. Most modulators have internal attenuators, or you can use an in-line external attenuator.
  • If the modulator is going into a larger distribution system, and the signal level is too low, you may want to use a low-noise distribution amplifier (like Kingray's MDA series) to boost the modulator before it goes into the rest of the distribution system.

• Have you got multiple digital modulators on the same site?

  • There are specific settings that need to be altered so as not to confuse the TVs, please see our article here for more information: https://support.radioparts.com.au/hc/en-us/articles/360053162072-Zycast-Resi-Linx-Using-multiple-modulators-on-a-single-site-multi-stacking-