Front Panel Controls, Indicators - HP 608E Operating And Service Manual

Model 608E/F
Section
m
7. FINE FREQ control: Used for fine frequency
adjustments
6. MODULATION control: Adjusts the percent of
modulatioo
ct
the RF output signal as observed
on the PERCENT MODULATION meter.
.
8. FREQUENCY RANGE switch: Five-position
switch used to select the desired frequency
range. Also positions the range pointer on the
dial. Switch positions are as follows:
10. DC .25 AMP fuse: Oierload protective device
for the +225 Vdc power supply.
9. AC POWER lamp: Indicates when ac power is
applied to the instrument.
•
RANGE
A
B
C
D
E
MODEL608E
10-21 MHz
21-43 MHz
43-95 MHz
95-215 MHz
215-480 MHz
MODEL 608F
10-21 MHz
21-44 MHz
44-95 MHz
95-210 MHz
210-455 MHz
19. AMPL TRIMMER control: A two-function con-
trol for peaking the RF output. During pulse
modulation, the control is tuned without push-
ing to peak the RF ootput. When sine-wave or
CW operations are conducted, the control
is
pushed
and
then tuned.
20. MODULATION switch: A six-position switch
that sets the instrument mode of operation.
The switch posit~ons are identified as follows:
PULSE: Sets the instrument for external pulse
modulation.
PULSE SET RF OUTPUT: Used to establish
the instrument operating point for external
pulse mo<h.llation.
AM: sets the instrument for external sine-
wave modulation.
1000 - : Sets the instrument for internal AM
modulation at 1000 Hz.
400 .. : Sets the instrument for internal AM
modulation at 400 Hz.
11. AC LINE fuse: Protective device between the
instrument and the ac power source.
12. AC POWER ON switch: Controls application
of ac power to the instrument.
13. FREQ CONTROL rNPUT connector (Model
608F only): input connector for the dc control
voltage when the instrument is used with a
Model 8708A Synchronizer.
14. AM/PULSE MOD INPUT connector: Input con-
nector for AM or pulse signals during external
sine-wave or pulse operation. During internal
sine-wave modulation, a 400 or 1000 Hz signal
is available at the connector for synchronizing
external equipment.
15. UNCAL RF OUTPUT connector: Ultput con-
nector in the 608E delivers an uncalibrated,
unmodulated RF signal
to
external equipment.
In
the Model 608F used with the Model 8708A
Synchronizer, output connector delivers an
uncalibrated FM signal.
16. MEGACYCLES dial: Indicates selected fre-
quency range and frequency in MHz.
17. RF OUTPUT meter: Indicates level of RFpo-
wer applied to the attenuator as selected by
operation of the RF OUTPUT control. Also
used
in
conjunction with the AMPL TRIM:MER
control to peak the RF output signal.
18. Frequency control: Used
to
select the output
frequency within a frequency range as observed
on the MEGACYCLES dial.
CW: Sets the instrument to provide aCW output.
21. XTAL CAL GAIN control: Controls audio level
of beat-frequency output at the XTAL CAL
OUTPUT connector.
22. Attenuator control: Controls RF ootput levels
of
+7 dBm and below. OJtput levels selected
by use of the Attenuator Control are accurate
as long as the RF OUTPUT meter needle indi-
cates +7 dBm (ATTENUATOR CALIBRATED).
23. RF OUTPUT connector: OJtput cOlUlector for
the calibrated RF signal (refer to CAUTION,
paragraph 3-7).
24. XTAL CAL switch: Three-position tog g I e
switch used when performing frequency cali-
brations. Switch positions are a s follows:
1 MC: Provides 1 MHz checkpoints from 10
to 270 MHz.
5 MC: Provides 5 MHz checkpoints from 10-
480 MHz in the Model 608E and from 10-455
MHz in the Model 608F.
OFF: De-energizes oscillator circuits.
25. FREQ ANALOG OUTPUT connector (Model
608F only): Delivers a resistance proportional
to frequency to the Model 8708A Synchronizer
during phase-lock operation.
26. XTAL CAL OUTPUTCOlUlector: Supplies cal-
ibrating signals to an operator for frequency
calibration. Accommodates an earphone plug.
Figure 3-1. Front Panel Controls, Indicators, and Connectors (Cont.)
3-3