VHF-UHF - LNB 10GHz external reference

Difference between revisions from 2020/08/19 20:52 and 2020/08/19 20:50.
[<<- Web page|https://remoteqth.com/lnb.php]

This is the 10 GHz Low Noise Block (LNB) modified for 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 or 10 MHz reference signal works as DC injector and also 25 MHz Source for LNB. There is also variable attenuator for IF signal which allows you to change IF signal from 0 to maximum. You can still switch between V and H polarisation by supply voltage.

!Quick Start Guide
*[Bias Tee LNB BOX|https://remoteqth.com/wiki/index.php?page=VHF-UHF+-+LNB+10GHz+external+reference#Bias_tee_LNB_BOX]
*[Selecting of signal source TCXO or 10MHz reference IN|https://remoteqth.com/wiki/index.php?page=VHF-UHF+-+LNB+10GHz+external+reference#Signal_source_TCXO_or_10MHz_reference_IN]
*[Power supply cable|https://remoteqth.com/wiki/index.php?page=VHF-UHF+-+LNB+10GHz+external+reference#Power_supply_cable]
*[10 MHz GPSDO PLL|https://remoteqth.com/wiki/index.php?page=VHF-UHF+-+LNB+10GHz+external+reference#GPSDO_PLL]
*[2-way splitter for 10 MHz reference|https://remoteqth.com/wiki/index.php?page=VHF-UHF+-+LNB+10GHz+external+reference#Two_way_splitter]
*[POTY atnenna adapter|https://remoteqth.com/wiki/index.php?page=VHF-UHF+-+LNB+10GHz+external+reference#POTY_dual_band_antenna_adapter]
!
[https://remoteqth.com/img/ZAW-WIKI/lnb_ext/1_850.png|noborder]
[https://remoteqth.com/img/ZAW-WIKI/lnb_ext/2_850.png|noborder]

!Bias tee LNB BOX
* Small box works as DC bias tee, 25 MHz source for LNB, variable ATT and protections.
* Allows you to supply DC voltage and 25 MHz reference for PLL of LNB over one coax.
* You can use internal TCXO with 0,2 ppm or some 10 MHz reference signal.
* You can switch H and V polarisation
* Protections DC and RF !
* Variable Attenuator !
[https://remoteqth.com/img/ZAW-WIKI/lnb_ext/lnb_bias_tee_tcxo_2_850.png|noborder]
* blue trimmer works as Variable Attenuator.
[https://remoteqth.com/img/ZAW-WIKI/lnb_ext/lnb_bias_tee_tcxo_850.png|noborder]



!Signal source TCXO or 10MHz reference IN
* By the jumper JP1 you can select signal source for PLL
* There is internal TCXO which you can use if you do not have 10 Mhz external source
* JP1 : 12 = Internal TCXO
* JP1 : 23 = External 10 MHz reference signal
[https://remoteqth.com/img/ZAW-WIKI/lnb_ext/jumper_source_850.png|noborder]

!Power supply cable

[https://remoteqth.com/img/ZAW-WIKI/lnb_ext/3_850.png|noborder]

!GPSDO PLL
* Optional GPSDO PLL 
* Including GPS antenna and DC power cable
* 3,5mm Jack with GPS data out
* Please be patience, GPS lock could take long time at first time. Also depends on the GPS satellites count etc.
[https://remoteqth.com/img/ZAW/lnb-bias-tee-box25/gpsdo/1_850.png|noborder]
[https://remoteqth.com/img/ZAW/lnb-bias-tee-box25/gpsdo/2_850.png|noborder]


!Two way splitter
* You can you 2-way splitter to split reference 10 MHz signal from source to LNB and another device like SDR, TRX etc

[https://remoteqth.com/img/ZAW-WIKI/lnb_ext/2way_850.png|noborder]





!POTY dual band antenna adapter
* PETG UV stable material
* 22 mm Cu pipe size
[https://remoteqth.com/img/ZAW-WIKI/lnb/lnb_2_850.png|noborder]
[https://remoteqth.com/img/ZAW-WIKI/lnb/lnb_3_850.png|noborder]
* Use tape to waterproof it.
[https://remoteqth.com/img/ZAW-WIKI/lnb/lnb_4_850.png|noborder]
[https://remoteqth.com/img/ZAW-WIKI/lnb/lnb_5_850.png|noborder]
[https://remoteqth.com/img/ZAW-WIKI/lnb/lnb_7_850.png|noborder]