Operation & Service Manual
Section I
Model 1805B RF Control Unit
Introduction and General Description
Table 1-1 Specifications
Specification
Description
Temperature Range
Operating: +10 to +40°C (+ 50 to + 104°F)
Storage: -40 to +75°C (- 40 to + 167°F)
Power Requirements
100/120/220/240 Vac +5%/-10%, 48-66 Hz 40 Watts nominal
Physical Dimensions
Depth: 17.5” (44.45 cm)
(Figure 1-9)
Width:
8.4” (21.33 cm)
Height: 7” (17.78 cm)
Weight:
13 lbs. (5.9 kg net)
Construction
Cabinet or Standard Rack (1/2-Rack) Mount
Operating Modes
Remote: IEEE-488-1978 full function Bus Control of RF ON/OFF and
Substituted dc Power Levels (0.5mW and 1-10 mW in 1 mW
steps)
Local: Manual front panel control of all function such as RF ON/OFF
and Substituted dc Power Levels (0.5mW and 1-10 mW
in 1 mW steps)
DC Substitution
DC Substituted Power Level Range: 0.5,1,2,3,4,5,6,7,8,9,and 10 mW.
DC Substituted Power Accuracy (at 30±0.7 mW bias power):±0.1%
+5
μ
W
Bias Power Range: 29-31 mW, automatic with error indication for out-of-
range balance condition
Power Level Control Range: Approximately 3-23 dB minimum
(dependent upon specific signal source)
Leveled RF Power Dynamic Range: ±3 dB
(Referenced to DC Substituted Power)
Unbalanced Detector: Sensitivity: 2 mW/division
Resolution: 0.2 mW
Level Control Loop Gain: 80dB minimum
Temperature
Ambient Temperature Range: (50° to 104°F)
Controller
Loop Gain:
80 dB minimum
Open Loop Frequency Response: 0.1 Hz
Warm-Up Drive (saturated):
8 ~ 10 V at 200 mA min.
Indicator:
Voltmeter with marked operating point
*Bias Power Temperature Sensitivity: 2 mW/C°/hr
*Mount Warm-Up Time:
2 hours nominal
*Internal Temperature:
+46°C nominal
*Related thermistor mount specifications
Connectors
Mount Bias:
Binding Post, standard 0.75” spacing for Banana plugs
+AM MODULATION:
BNC female
-AM MODULATION:
BNC female
CONTROL (Temperature):
four pin threaded
IEEE-488 INTERFACE BUS:
24 pin connector per IEEE-488-1978
Recommended Materials
Table 1-2 provides a list of recommended consumables to be used when cleaning or servicing
the RF Control Unit.
Special Tools and Test Equipment
All recommended special tools and test equipment to be used with the RF Control Unit are
listed in Table 1-3.
APPLICATIONS
The primary function of the Model 1805B is to function as part of the TEGAM System IIA
Precision Power Source for the transfer of calibration factors to power meter sensors. Figure
1-5
