Controls and Terminals --
QUENCH - This variabl re is t rc ntrols the s nsitivity of th det c-
tor circuit.
VOLUME - This variable resistor controls the amount of audio voltage
admitted to the amplifier and therefore the loudness of the sound produced by thl
speaker or the phones.
TUNING - This knob drives the frequency dial and tuning capacitor by
means of a friction drive on the edge of the tuning dial. A direct reading scale,
calibrated in megacycles, for each range is engraved on the dial. The scale in
use is indicated by the position of the RANGE knob.
10 - 20 Etc. - This knob rotates the coil turret so that coils covering
the desired range may be inserted in the detector tuning system.
PHONES - Whenever it is desirable to operate the instrument with heat
phones instead of the built-in speaker, the phones are plugged into the jack in
the lower left corner of the panel. The loudspeaker is automatically disconnect
whenever the phones are plugged in.
INPUT - The type BNC jack, located in the lower left corner of the cor
trol paneme input terminal for the primary of the detector tuning system,
.4 AMP - The fuseholder, located in the lower right corner of the con-
trol panel, contains a .4 ampere cartridge fuse. The fuse may be replaced by
unscrewing the fuseholder cap and inserting a new fuse. Replacement fuses for
this instrument must be as specified in the Replaceable Parts List.
ON - This toggle switch, which is located in the lower right corner of
the contrrpanel, controls the power supplied to the instrument from the power
line. When the switch is in the ON position, the dial lamp will be lighted.
Power Cable - The power cable consists of three conductors. Two of
these conductors carry power to the instrument while the third conductor (greer
wire) is connected to the instrument chassis. The third wire projects from the
cable near the plug end of the cable and may be connected to a ground when it is
desirable to have a grounded chassis.
Operation --
The procedure for operating the Model 417A is as follows:
1. Connect the power cable to a 115 volt power line and turn the power
switch to ON. The instrument will be ready to operate in less than a minute.
2. Connect the DETECTOR jack of the Hewlett-Packard Model 803A
VHF Bridge to the INPUT jack of the Model 417A.
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ACEC
