10 GHz LNB + Bias Tee with TCXO or 10 MHz reference input (9750 MHz LO) for GPSDO - QO-100 and tropo

wiki order

This is the Ku band 10 GHz LNB (Low Noise Block) with external reference input. LNB needs external 25 MHz reference for internal PLL. This signal is feeded by the same one coaxial cable as IF down. Special small Bias Tee box with TCXO (25 MHz) or 10 MHz reference signal (GPSDO) works as DC injector and also 25 MHz source for the LNB. There is also variable attenuator for IF signal which allows you to change IF signal from 0 to maximum. High Pass Filter and 25 MHz Notch Filter at IF line. You can still switch between V and H polarisation by the supply voltage. You can use it for QO-100 satellite and also for Tropo contesting / DXing.

Main functions:

Technical parameters:

LNB local oscillator:				9750 MHz (with 25MHz source)
Conversion gain of a LNB:			> 50 dB
LNB IF:						739 MHz for 10 489 MHz (QO-100), 618 MHz for 10 368 MHz (TROPO/EME)
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 and  +15 V for Horizontal - WB
Bias Tee IF loss:				typ. less than 3.5 dB (filter + notch + ATT)
Variable Attenuator on IF:			1 dB to NO signal
⚠ 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.

⚠ 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 multiplying by PLL.

Block diagram of the Bias Tee BOX:

LNB bias tee block diagram



Set Includes:


LNB Bias Tee BOX with TCXO / 10 MHz reference input
MKII. rev 1.2 sch pcb Files216 MANUAL MKII
rev 0.3 sch pcb Files216 MANUAL ver 0.x
3D printed POTY adapter STL file
rev 0.1 11-2019 picture Files284
We believe open source is a better way of doing things.
View and download the Shield Schematic and PCB Kicad/Eagle CAD files,
LibreCAD .DXF, or Inkscape .SVG files.
The hardware designs are released under the
Attribution-NonCommercial 2.0 Generic