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Pack LNB PLL TCXO + BIAS-T for QO100 10 GHz reception LNB EXT OSC MK3 View larger

Remote QTH


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Pack MK3 LNB PLL TCXO + BIAS-T reception QO-100 10 GHz with 25MHz source

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The RemoteQTH 10 GHz LNB EXT OSC MK3 pack is an advanced system comprising an ultra-low-noise converter block and a Bias Tee, optimised for receiving 10 GHz satellite signals with exceptional accuracy.

Designed for radio astronomy enthusiasts and satellite communications (in particular QO-100), this device offers an integrated solution for improved reception quality, stability and accuracy.

  • Ultra-low-noise converter block: Ensures clear reception of satellite signals
  • 25 MHz External PLL Reference Signal: Improves signal stability for accurate reception
  • LNB with Local Oscillator (LO) at 9750 MHz : Allows IF (Intermediate Frequency) conversion on 739 MHz for 10489 MHz reception (QO100) and 618 MHz for 10368 MHz (other satellites).
  • Conversion gain: Over 50dB at 700 MHz IF, optimising reception sensitivity.
  • V + H polarisation: Supports vertical and horizontal polarisation with +12V power supply for V-pol and +18V for H-pol
  • Use ofa single coaxial cable for power supply, conversion and reference source: Simplifies installation by reducing the need for multiple cables.
  • Reference signal filtering: By crystal filter (X-tal) for increased signal purity
  • Variable attenuator on the IF: for precise gain adjustment without overloading the receiver
  • Input for external 10MHz reference or GPSDO

Supplied with: 1 RemoteQTH 10 GHz MK3 pack with LNB and Bias Tee assembled and tested, 1 DC socket for power supply, 4 self-adhesive pads, modified LNB with integrated 25 MHz source.

More details

136,61 € tax excl.

140,83 €

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   4 Items


Data sheet

  • Local oscillator LNB 9750 MHz (with 25 MHz source)
  • LNB conversion gain > 50 dB @ 700 MHz
  • IF LNB 739 MHz for 10489 MHz (QO-100)
  • 618 MHz for 10368 MHz
  • 10 MHz reference input power -3 dBm to +13 dBm
  • Stability with 10 MHz reference depends on reference source
  • Stability with TCXO 25 MHz (0.2 ppm) 0.2 ppm (X 390)
  • 25 MHz cut-off at RX output port > 50 dB
  • Frequency error with TCXO max 3 kHz, typ. less than 1 kHz (after 5 minutes)
  • DC power supply +12 V for vertical polarisation (NB)
  • +18 V for horizontal polarisation (WB)
  • Polarisation tee Typical IF loss less than 3.5 dB at 2 GHz
  • Variable attenuator on IF 0 dB at NO signal

Performance and Protection :

  • 10 MHz Reference Input Power: From -3 dBm to +13 dBm, offering flexibility in the choice of reference source.
  • Stability: With TCXO from 25 MHz to 0.2 ppm, ensuring exceptional signal reception accuracy.
  • Cut-off at 25 MHz at the RX Output Port: Greater than 50 dB, effectively reducing unwanted interference.
  • Frequency Error with TCXO: Maximum of 3 kHz, typically less than 1 kHz after 5 minutes warm-up.

Power supply and installation:

  • DC Power Supply: +12 V for vertical polarisation (NB) and +18 V for horizontal polarisation (WB).
  • Polarisation Tee: IF loss typically less than 3.5 dB at 2 GHz, minimising the impact on received signal quality.

The new Bias Tee Box MK3 offers two LNB reference signal options. The first is an internal TCXO (very accurate and stable), which can be used if you can't connect an external 10MHz source. If you have an external 10MHz precision signal source, for example GPSDO, you will get an even more accurate and stable reference signal for the PLL in the LNB.

The reference signal is sent to the LNB with the LNB IF signal via a coaxial cable. In this MK3 version, the reference signal is multi-filtered by quartz filters, which guarantees both signal purity and the reduction of any harmonic components.

The result is a much cleaner IF signal and much better PLL phase noise (compared with the previous version), even when using a lower quality 10 MHz reference source (GPSDO). This is particularly useful for weak signals at and below the noise floor (e.g. in EME).

A specially designed diplexer in the Bias Tee package separates the reference signal (25MHz) from the IF signal ( > 600MHz) and the LNB DC supply.

Switching from polarisation to H-pol is indicated by an LED on the front panel (supply voltage greater than 18V).

The power supply is protected by an electronic fuse that protects the box in the event of a short-circuit in the coaxial cable. The LNB input is also protected by a discharge tube and antiparallel diodes.

The IF signal from the LNB passes through the frequency and power diplexer to the variable attenuator. This allows the LNB's conversion gain to be adjusted to avoid overloading the receiver.

In this MK3 version, the ATT trimmer is positioned so that the gain can be easily adjusted on the front panel of the box.

The RX output is again protected by diodes, and there is a fuse that will disconnect the unit if there is a strong signal on the RX port - a signal from a poorly connected TX and levels above 20mW - protecting the box and LNB from destruction.

The main difference from the old version is the filtering of the 25 MHz reference signal. X-tal filters are used to obtain the best possible filtering. One before the buffer amplifier and one after. Another is located directly in the LNB. This filtering gives better phase noise and greater signal clarity.


  • Special SAT experiments (
  • Starlink experiments
  • Ku-band university projects
  • Coherent receivers
  • QO-100 Es'Hail satellite
  • TROPO 10GHz
  • SatTV DXing


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