10 GHz LNB with external reference / GPSDO
More at: https://remoteqth.com/lnb_gps.php
Main functions:
- Ku band LNB
- Very low noise converter
- 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 board
- DC supply over one coax together with 25 MHz PLL reference signal
- Build in TCXO with 0,2 ppm as alternative to 10 MHz reference input More in WiKi
- 10 MHz reference input for very big frequency precision and stability
- LO = 9750 MHz: 10489 - 9750 = 739 MHz IF etc
- Variable ATTENUATOR in the bias tee
- 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
- 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 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 Bias Tee IF loss: typ. less than 2 dB Variable Attenuator on IF: 0 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.
Schematic for version 0.3
PCB for version 0.3
Duplexer 25 MHz and High pass filter for IF + ATT
I
Optional GPSDO PLL
 |
| Internal TCXO or 10 MHz external reference source |
POTY antenna adapter for 22 mm Cu pipe
