Zrex tuning

Zrex has been decommissioned. These notes are only of historical interest, at best.

Instruction for using 4GHz AOS and wideband receivers can be found here. Instructions to set up the 230GHz wideband receiver is found here summarized by Richard. Instruction to setup the sidecab PLL for the 345 GHz wideband receiver (Barney) can be found here. When using the SMA PLL for the 345 GHz wideband receiver, please use the instruction here.

If it's heterodyne receivers, you need to tune the receiver manually. Tuning instructions are found at Tuning instruction page under heterodyne instrumentation homepage. Overall instructions are found at Receiver Tuning Cookbook page. Before starting the tuning process, don't forget placing hot load in front of your receiver. Also, always wear anti-static wrist strap with grounding wire when you touch receiver components. Note that the 1mm wide-band receiver and the 850 GHz receiver systems are different from side cab receivers. Contact experts (1mm wide band rx: Richard Chamberlin, Hiroshige Yoshida, Chip Sumner, Frank Rice/ 850GHz rx: Richard Chamberlin, Hiroshige Yoshida, Jacob Kooi) for details.

If you get a message SYNTH FAIL(06) on the antenna status monitor, powercycle the HP synthesizer (turn off and turn on) located just above the oscilloscope that allows us to check the Gunn lock status. You turn off, wait for 10 sec or so, and turn on the power of the HP synthesizer, and go back to UIP, reload the line (UIP> lo yourline/force) and see if the error message disappears or not. If this doesn't work, wait for 5 min. If 5min doesn't work either, wait for 20 min to let the synthesizer cool down completely. After 20 min, turn the power on and load some other line which is lower than your line frequency first, then load your line frequency next.

After you've done the tuning with the sidecab receivers, fold the ladders you used and lean it against the wall.

- Before tuning the receiver on - check the attenuator: fully attenuated - Multiplier bias: normal, set with a value of 4V - Magnet: off

- Turn on one of sidecab receivers - UIP> za 44 (to allow the mirror to change the position for your receiver) - UIP> lo yourline /force /lock=default /if=1.5 (For side cab receivers, to set the line at the middle of the AOS) - check the tertiary mirror position.

- Don't go beyond Vop of greater than 10.5 V. If you go beyond that, you'll be in the over voltage protection mode. To get out of the mode, do following. The steps below will be done in the phase lock control panel in the sidecab.

i. Switch to “local” mode from “remote” mode.

ii. Turn the Gunn off. 
iii. Turn Vop down for 2-3 turns. At the same time, watch the Vop reading on the reader above the HP synthesizer.  
iv. Turn the Gunn on.   
v.  Switch to "remote" mode from "local" mode.  

And follow tuning instruction for tuning.

- Turn on Barney on a cass focus - UIP> inst RX345x - UIP> za 35 (to make it easy to see each component for tuning on the cass focus) - UIP> lo yourline /force /lock sma_pll /if 5.5 /receiver RX345X - UIP> POINTING BARNEY_CASS (load the pointing file for Barney) - UIP> spec /lock (force the antenna computer to accept the phase lock loop is locked) - UIP> spec xx /ffts1 5.5 /ffts2 /restart (/display puuoo:0) (xx: integration time, you can use ffts2 when using Barney and ZRex) - kilauea> /opt/uip/bin/disable_operator_terminal (disable “pll unlocked” warning message on the UIP terminal)

A useful instruction on how to use Barney with sidecab PLL is available on the web (last updated on 2011/01/25)

- Turn on Franks receiver on a cass focus - UIP> instrument RX230X - UIP> za 35 (to make it easy to see each component for tuning on the cass focus) - UIP> lo yourline /force /lock sma_pll /receiver RX230X - UIP> POINTING Z_REX - UIP> spec /lock (force the antenna computer to accept the phase lock loop is locked) - kilauea> /opt/uip/bin/disable_operator_terminal (disable “pll unlocked” warning message on the UIP terminal) A useful instruction on how to use Franks receiver is available on the web (last updated on 2010/05/06)

- After tuning After you've done the tuning with the sidecab receivers, fold the ladders you used and lean it against the wall.

cso/instruments/heterodyne/tuning/zrex.txt · Last modified: 2012-11-21 21:36 by sradford
 
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