UDC Up/Down Covnerter for 12meter

aug16

    A udc device takes 1 to 12 GHz rf input (one for each pol). It mixes the signal up to around 22.5 Ghz and then back down to an IF that can be from 500 to 2.5 Ghz. There are multiple frequency band outputs (for various backends).
    We will have 2 UDC'S connected to the 12 meter telescope. 1 for sband and 1 for xband.

    A udc consists of 2 chassis's:

    The table below shows the output bands available :

freq Range
Ghz
use
2.0  - 2.5
vlbi
1.5 - 2.0
vlbi
1.0 - 1.5
vlbi
.5 to 1.0
vlbi
.5 to 1.0
Ao iflo
1.0 to 2.0
Ao iflo



Controlling the udc

web page to control udc
udc12m.naic.edu
web page to config ethernet
to serial devies
ip addresses of device
ipAddresses


udc1
(aug16)
synth chassis
192.168.100.228
atten chassis
192.168.100.227
udc2
aug(16)
synth chassis 192.168.110.105 (udc2-105)
atten chassis 192.168.110.106 (udc2-106)
attenuator range
0 to 15.5 db (in .5 db steps ?)
lo1 range
5750 to 8250 Mhz
Lo Equation:
Lo1= 22500  + (rfFreq - If1Cfr)/4.   In MHz






Notes:



Attenuators   

    The attenuators   are connected to an arduino micro controller via  an spi interface.  The host computer talks to the arduino via ethernet.
There are 12 programmable attenuators. 2 (polA,polB) for each of the 6 udc bands.






Synthesizers

    There are 2 synthesizers:



Schematics:

UDC schematic (.pdf)


More info:


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