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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.
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.
ASSEMBLED: classic version - ready to use
ASSEMBLED: version with POTY adapter (only adapter, not 2.4 GHz antenna!) - ready to use
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.
| 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
MK3: Internal duplexer - cut off 25 MHz signal to RX output
Comparison of MK3 and older Bias Tee box
Data sheet
Specific References
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