national radio astronomy observatory green bank, … · the antenna to a comparison termination ......
TRANSCRIPT
NATIONAL RADIO ASTRONOMY OBSERVATORYGreen Bank, West Virginia
Electronics Division Internal Report No. 96
A DOUBLE-SWITCHEDWATER VAPOR RADIOMETER
James L. Dolan
OCTOBER 1970
NUMBER OF COPIES: 100
A DOUBLE-SWITCHED WATER VAPOR RADIOMETER•■••••■•••••••■•
James L. Dolan
Introduction
This report should be associated with Electronics Division Internal Report
No 89, "General Description and Operating Instructions for the Water Vapor Re-
ceiver". The radiometer described in report No 89 has been considerably modified,
the most significant modification being the addition of a second synchronous detector
(described later). The original water vapor unit was placed in operation approxi-
mately one year ago (fail of 1969). The data collected thus far has been analyzed
by B. A. Manchester and J. W. Waters. (See the progress reports that have been
issued. )
Local Oscillator Freciuencies
The Gunn effect devices currently in use as local oscillators have given some
trouble, particularly in switching (or pulsed) mode. It is difficult to find two fre-
quencies at which both oscillators in both units turn on and off reliably. The oscilla-
tors are now operating as follows:
High position er', 22. 8 GHz
Low position fr', 20. 4 GHz
The respective oscillators in each unit are set as nearly as possible to the same fre-
quency to avoid cross-coupling by placing the local oscillator within the 40 MHz
dead-band centered on the local oscillator frequency.
Thermal calibrations were run on September 4, 1970 for each unit and each
frequency. Results were as follows:
Unit 1 Low frequency. . cal = 67.5°
High frequency.... cal = 72°
Unit 2 Low frequency. . cal = 70. 5°
High frequency.. . cal ----- 66. 5°
Modifications
After considerable data reduction and attempts to correlate the interferom-
eter phase changes with the measured water vapor, it became obvious that a method
to separate water vapor line emission from condensed water continuum radiation
was needed. A method of doing this was devised by Dr. S. Weinreb. Simply, it
consists of a radiometer that is simultaneously load and frequency switched. The
front-end (Dicke) switch is driven at F1 (presently about 50 Hz) and switches from
the antenna to a comparison termination (load switched). Synchronous detector
number 1 is also driven at the same switch rate, F i . Theoretically, synchronous
detector number 1 will not respond to continuum radiation. The local oscillator is
switched from F Low to F High at switch rate F 2 (presently r=-' 2 Hz). The switched
output from synchronous detector number 1 is routed to synchronous detector num-
ber. 2, where it is synchronously detected at 2 Hz. We have defined 22.8 GHz (High
LO) as signal, and 20.4 (Low LO) as comparison. The output of synchronous detec-
tor number 2 can be:
1) signal - comparison
2) signal + comparison
3) signal
4) comparison.
We are presently monitoring signal - comparison, and comparison, although this
may change in the future. Aside from some minor instrumental problems, the sys-tems are performing as planned.
Operating Procedure Changes
Reference frequency • Normally set to 50 Hz. Controls only
Dicke switch and synchronous detector
number 1. The local oscillators and
synchronous detector number 2 are
driven 2 Hz. No external adjustment
is possible.
Dicke switch
Operating Procedure Chang&v(continuecil;
Previously set to "S
set to "Mod".
— now should be
Circuit Additions
In addition to the second synchronous detector, a total power DC back-off-
times-ten amplifier was added between the total power monitor front panel and rear
pan.el, This allows total power at the rear panel only to be backed off to 43 and AV
to be amplified ten times. (See drawing number S2. 502-12.)
Center Pair, No Tracer
Center Pair, No Tracer
Black Tracer .............
Gray Z-15)Red a -16 )ShieldRed V -17Yellow W-18ShieldRed m-19Yellow n -20Shield e
Op Amp (Green) (N. T.Cal Sig - 7 (Yellow) Attn.)
LO Sig (Card 3) (Blue)(Switch) (White)
Det Sig (Card 2) (Orange)(Black)
TYPE 15 Twisted Pair No. 18
Remarks
+15Common
-15Common
+28Common
ThermistorControl
Audio
Blue Tracer .....
Purple Tracer . . . •
Gray Tracer
Green Tracer . .....
Yellow Tracer • • • • • • •
Center Pair, No Tracer
Center Pair, No Tracer
Red A-1Yellow B-2Shield Red C-3Yellow D-4Shield jRed 0-5Yellow P-6Shield Red F-7 )Yellow G-8 )ShieldRed T-9 )Yellow U-10 )ShieldGray K-11Yellow L-12ShieldBlue X-13Yellow Y-14Shield
CABLE NUMBER 18-19-20-21
(CaosS,c2de Color code Pin Vo,
(Blue)(White)
(Blue)(White)
Noise (K - Red, 11- White)Tube (L - Black, 12-Red)
Ferrite Sw. (Gray)Drive (Red)
Orange Tracer ...........
Red Tracer .............
Brown Tracer ...........
Red b-21Yellow c-22Shield kRed r-23Yellow s-24ShieldRed t-25Yellow u-26Shield
Xtal Curr (Yellow)No. 1 (Black)
Xtal Carr (Blue)No. 2 (Black)
Spare
Blue f-27Gray g-28ShieldRed h-29Blue j-30Shield
Center Pair, No Tracer
Center Pair, No Tracer
LO Atten (Green)Current (Black)
Spare
Spare Pins (3)
COMPARISONF1LO
/SIGNAL BANDSIGNAL BAND
SIGNALF2LO
/SIGNAL BAND \_WATER VAPOR
/ SIGNAL BANDWATER VAPOR
20.40 Gl-lz20.10 20.38 20.42 20.70
22.80 GHz22.50 22.78 22.82 23.10
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