TBASERDN040213

February 13, 2004

Q-band receiver in the Equipment Room, cold.  Using lab 83620 as LO1,
set at 9250MHz.  Connected IF of L1 and L2 to OR 1 and 3 respectively,
by coax.  These tests are after removing LO multipliers found with
bias oscillations 

L1 -> OR1 -> CM1 -> SF1 -> ACS J1 (bank 1, rcvr 1)
	     cM2 -> SF2 -> ACS J3 (bank 2, rcvr 1)

L2 -> OR3 -> CM5 -> SF5 -> ACS J2 (bank 1, rcvr 2)
	     CM6 -> SF6 -> ACS J4 (bank 2, rcvr 2)

T=120s, integration=10s.  ACS in two bank, two sampler/bank mode.

Scans 1-6		  w/ room temp. load

Scans 7-16		  w/ LN2 load.

Changed R1->OR1; R2->OR3.

Scans 17-25	 LN2 load

Adjusted bias on R2: VD1->1.50 from 0.882 (VG1-> +0.31)
Scans 26-34

Adjusted bias on R2: VD1->1.70 from 1.50 (VG1->-0.01
Scans 35-42

Changed to L1 and L2, rebalanced spectrometer.
Scans 49-50 (system crashed during 50).

-Break-
Resumed ~`20:00:00 UT

Adjusted first stage all four chs to 1.70V, 1.0mA.
L1->OR1, L2->OR3

Scans 101-108.

NT high.  Adjusted bias L1 and L2 -> 1.2V, 1.5mA
Scans 110-114

Changed to R1->OR1, R2->OR3. (1.70V, 1.0mA)
Scans 115-119.

Changed bias R1,R2 to 1.2V,1.5mA.
Scans 120-129

Analysis:

See the Tex report in this directory.