10GHz LNB & Bias Tee box with external reference input. This is new model of the Ku band 10 GHz LNB (Low Noise Block) with external reference input. This new MK3 model has got X-tal filters for the reference signal in LNB as well as in the bias tee box.

Read moreShow less
143.99 € (tax incl.)
143.99 €
119.00 € (without tax)
LNB version
  • classic
  • with POTY adapter
in stock, shipped in 2-3 days

Price history     Price history

The lowest price in the 30 last days was 143.99 €

Add to compare0
Add to wishlist

This new Bias Tee Box MK3 offers two LNB reference signal options. The first is an internal (very accurate and stable) TCXO - this can be used if you cannot connect an external 10MHz source. If you do have an external 10MHz precision signal source - e.g. GPSDO - this will give you an accurate and stable reference signal for the PLL in the LNB.

The reference signal is sent to the LNB together with the IF signal from the LNB via a coaxial cable. In this MK3 version, the reference signal is multi-filtered by quartz filters, ensuring both signal purity and reduction of possible harmonic components. The result is a much cleaner IF signal and noticeably better PLL phase noise (compared to the previous version or the competition), even when using a lower quality 10MHz reference source (GPSDO). This is particularly beneficial for weak signals at and below the noise floor - EME.

A specially designed diplexer in the Bias Tee box separates the reference signal (25MHz) from the IF signal ( > 600MHz) and the DC power supply to the LNB. The LNB power supply still guarantees polarization switching capability and switching to H-pol is indicated by a front panel LED (supply voltage above 18V). The power supply is protected by a special electronic fuse that protects the box in the event of a short circuit in the coaxial cable. The input from the LNB also has HV protection by gas 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 conversion gain of the LNB to be adjusted to avoid overdriving the RX. In this MK3 version, the ATT trimmer is positioned so that the gain can be conveniently adjusted on the front panel of the box. The RX output is again protected by diodes, and there is a super-fuse that will disconnect the unit if there is a strong signal on the RX port - a signal from an incorrectly connected TX and levels above 20mW - protecting the box and LNB from destruction.

The main difference from the older version is the filtering of the 25MHz reference signal. X-tal filters are used to achieve the best possible filtering. One before the buffer amplifier and one after it. Another one is directly in the LNB. Thanks to this filtering, better phase noise and signal clarity is achieved even with a worse 10MHz signal source.


  • Special SAT experiments (mdpi.com)
  • Starlink experiments
  • University Ku band projects
  • Coherent receivers
  • QO-100 Es'Hail satellite
  • TROPO 10GHz
  • SatTV DXing

Main functions

Ku band LNB

  • Very low noise converter block
  • External 25MHz PLL reference signal
  • LO = 9750 MHz: 10489 - 9750 = 739 MHz IF etc.
  • Conversion gain typ. 50dB @ 700 MHz IF
  • V + H polarisation
  • One coax for DC, IF and reference
  • Reference signal filtered by X-tal filter
  • Voltage supply +12V for V-pol, +18V for H-pol

Bias Tee BOX

  • One coax for DC, 25 MHz PLL reference signal and IF
  • Build in TCXO with 0.2 ppm as alternative to 10 MHz reference input
  • 10 MHz reference input for very high frequency precision and stability
  • LO = 9750 MHz: 10489 - 9750 = 739 MHz IF etc.
  • More flat IF range compare to old version
  • X-tal filters at reference signal
  • Variable ATTENUATOR at front panel
  • LED indication for H-pol
  • High voltage/current protection
  • Voltage supply +12V for V-pol, +18V for H-pol
  • Electronic DC fuse
  • Super-Fuse at RF line
  • Bias tee connectors: IN (LNB) = F, OUT = SMA, 10 MHz ref IN = SMA
  • 4pcs self adhesive feet pads included
  • DC plug included

Option: 3D printed POTY dual band antenna adapter

  • UV stable PETG material
  • 22 mm Cu tube diameter
  • POTY pipe WG fixed by M4 screw
  • ONLY ADAPTER, 2.4 GHz antenna not included!

Available as

ASSEMBLED: classic version - ready to use
ASSEMBLED: version with POTY adapter (only adapter, not 2.4 GHz antenna!) - ready to use


Included in package

LNB and Bias Tee assembled and tested
POTY adapter (version with POTY)
DC plug - image
4pcs self adhesive feet pads - image


If you want to know more please check our wiki with 10 GHz LNB with EXT OSC manual.

Technical Parameters

LNB local oscillator 9750 MHz (with 25 MHz source)
Conversion gain of LNB > 50 dB @ 700 MHz
LNB IF 739 MHz for 10489 MHz (QO-100)
618 MHz for 10368 MHz
Reference 10 MHz input power -3 dBm to +13 dBm
Stability with 10 MHz reference depends on reference source
Stability with 25 MHz TCXO (0.2 ppm) 0.2 ppm (X 390)
25 MHz cut off to RX output port > 50 dB
Frequency error with TCXO max 3 kHz, typ. less than 1 kHz (after 5 minutes)
DC power +12 V for Vertical polarisation (NB)
+18 V for Horizontal (WB)
Bias Tee IF loss typ. less than 3.5 dB to 2 GHz
Variable Attenuator on IF 0 dB to NO signal

IMPORTANT NOTE: This Bias Tee box is designed for 10 MHz external reference source but you can also use internal 25 MHz TCXO, which is 0.2 ppm. Frequency error is max. 3 kHz.

IMPORTANT NOTE: Do NOT forget that the quality of the 10 MHz signal source has got final effect on the quality of the output signal. With added phase noise by PLL multiplying.

Block diagram for MK3 version

LNB bias tee block diagram mk3 version by qro.cz hamparts.shop

MK3: Internal duplexer - cut off 25 MHz signal to RX output

LNB bias tee internal duplexer by qro.cz hamparts.shop

Comparison of MK3 and older Bias Tee box

comparison LNB EXT OSC MK3 and previous version by qro.cz hamparts.shop

LNB with external reference bias tee box qro.cz hamparts.shop

LNB with external reference bias tee box poty adapter qro.cz hamparts.shop

10 MHz GPSDO with 2-way splitter qro.cz hamparts.shop

recommendations to buy rx audite sdr splitter switch by qro.cz hamparts.shop

Read moreShow less
Product Details

Data sheet

in enclosure
product dimensions
58x50x24 mm - al box
product weight (brutto)
0.23 to 0.26 kg
package dimensions
14.5x9.5x9.5 cm

Specific References

No comments

Leave a review

  • rating:
Describe this product using simple and short words.
Upload images:
Drop images here or click to upload.
You may also like
58.08 € (tax incl.)
The splitter or combiner is a very useful device. It can provide equal voltages, equal current, or equal power to matched or unmatched loads.
65.34 € (tax incl.)
Universal VHF/UHF/LNB Bias Tee ENC in box which is designed for Low Noise Amplifiers, buffer amps, LNB etc.
50.82 € (tax incl.)
Very stable OCXO board with TTL and Sine wave outputs
32.67 € (tax incl.)
RTL-SDR is a cheap software defined radio that uses a DVB-T TV tuner dongle based on the RTL2832U chipset and R820T2 tuner.





Create a free account to save loved items.

Sign in

Create a free account to use wishlists.

Sign in