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

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:

• Ku band LNB
• Very low noise converter block
• External 25MHz PLL reference signal over IF coax cable
• LO = 9750 MHz: 10489 - 9750 = 739 MHz IF etc
• V + H pol
• Supply over one coax
• Voltage supply +12V for V-pol, +15V for H-pol


• Bias Tee BOX
• DC supply over one coax together with 25 MHz PLL reference signal
• ONLY for LNB with 25 MHz PLL reference input
• Build in TCXO with 0,2 ppm as alternative to 10 MHz reference input More in WiKi
• 10 MHz reference input for very bhigh frequency precision and stability
• LO = 9750 MHz: 10489 - 9750 = 739 MHz IF etc
• High Pass Filter in IF RF line
• 25 MHz Notch Filter at RX output - version MK2
• 10 MHz input simply X-tal filter - version MK2
• Variable ATTENUATOR in the bias tee box
• High voltage / current protection
• Voltage supply +12V for V-pol, +15V for H-pol More in WiKi
• Bias tee connectors: IN (LNB = F, OUT = SMA, 10 MHz ref IN = SMA)


• Option: 10 MHz PLL-GPSDO reference source
• 10 MHz reference source locked to GPS signal More in WiKi
• RF output typ + 5 dBm
• HW by BG7TBL, modification by OK2ZAW
• Including GPS antenna and DC cable
• Including coax cable with BNC and SMA (abt 50cm)


• Option: 3D printed adapter for POTY dual band antenna
• UV stable PETG material
• 22 mm Cu tube diameter
• ONLY ADAPTER, not 2.4 GHz antenna!


• Option: 2-way small splitter box
• Small splitter for 10 MHz reference signal
• Splits 10 MHz signal to Bias Tee box and another your device (SDR, TX etc) More in WiKi
• Low loss 3,5 dB
• Including coax cable with SMA


• Option: RTL-SDR receiver with 1ppm TCXO
• RTL-SDR USB receiver
• In metal box
• 1 ppm TCXO for better stability
• Input SMA connector
• SMA - SMA cable included (17 cm)
• Firmware already installed
• 8 bit, up to 2 MHz of spectrum
• compatible with: HDSDR, SDR console etc.

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:

Measurements:

MK2:Internal duplexer - cut off 25 MHz signal to RX output		10 499 MHz to 749 MHz locked to external 10MHz reference		10 499 MHz to 749 MHz internal 25 MHz TCXO
Ver.1:Internal duplexer - cut off 25 MHz signal to RX output		10 368 MHz to 618 MHz locked to external 10MHz reference

Variants:

• LNB with external 25 MHz source over IF coax cable
• Bias tee box 25 MHz source
• LNB & Bias tee box 25 MHz source Photo
• LNB & Bias tee box 25 MHz source & RTL-SDR with SMA-SMA cable (15cm) Photo
• LNB & Bias tee box 25 MHz source & GPSDO 10 MHz reference with cable Photo Cable
• LNB & Bias tee box 25 MHz source & RTL-SDR & GPSDO 10 MHz reference with cables Photo Cable
• LNB & Bias tee box 25 MHz source & GPSDO 10 MHz reference & 2-way splitter box with cables Photo
• LNB & Bias tee box 25 MHz source & RTL-SDR & GPSDO 10 MHz reference & 2-way splitter box with cables Photo Cable
• LNB can be classic or with POTY adapter Photo

Set Includes:

• Ku band LNB with EXT PLL source
• Bias Tee BOX - assembled
• Option: RTL-SDR + SMA-SMA cable (15cm)
• Option: GPSDO PLL 10 MHz source + BNC-SMA cable (50cm)
• Option: 2-way small splitter box + SMA-SMA cable (15cm)
• Option: 3D printed (PETG material) POTY antenna adapter (22mm)
• POTY - ONLY ADAPTER, not 2.4 GHz antenna!

Download

LNB Bias Tee BOX with TCXO / 10 MHz reference input
MKII. rev 1.2		sch	pcb	Files246	MANUAL MKII
rev 0.3		sch	pcb	Files246	MANUAL ver 0.x
3D printed POTY adapter STL file
rev 0.1 11-2019		picture		Files467
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