Elenco Wide Band RF Generator - Manual (Page 5)

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1. FREQUENCY Dial: Sets the RF output frequency in the range selected by the
FREQ RANGE switch.
2. FREQ RANGE Switch: Has six positions for RF output frequency range.
3. XTAL Socket: For insertion of quartz crystal, 1 - 15MHz, in Type HC-6/u
holder.
4. PWR Switch: For turning on the AC power.
5. PILOT Lamp: Indicates when AC power is on.
6. MODE Switch: EXT MOD: For modulation of carrier with an external
source.
INT MOD: Use of internal 1kHz for modulation of external
circuit testing.
XTAL:
Crystal oscillator output Frequency depends on
crystal used.
7. INPUT-OUTPUT: For external modulation input or output from internal 1kHz
oscillator.
8. FINE Control: Continuous RF output voltage adjuster.
9. RF LOW-HIGH Switch: Sets the RF output level; at LOW, output is lowered by 10%.
10. OUTPUT Terminals: For connection to RF output leads.
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(5) In the following example, use of a 1MHz crystal will be given.
(6) Tune the receiver to 5MHz, or 5th harmonic of 1MHz. Then, by carefully tuning both
the oscillator and is adjusted to zero beat and the dial reading is noted. At other
frequencies spaced 1MHz apart, the same procedure is repeated, namely, oscillator
setting - tuning the receiver - retuning oscillator and noting the reading on the dial.
Practical use of harmonics up to the tenth or higher is possible. However, care must
be exercised in selecting the proper harmonic, especially at high RF when a relatively
low frequency crystal is used.
NOTE: When a receiver equipped with a beat frequency oscilallator is used, the
measurements can be simplified. The “zero-beat” condition is at the point where
the steady beat is heard most clearly.
9. Exposing the Chassis
REMOVE THE PLUG FROM THE POWER SOURCE.
LOOSEN THE TWO SCREWS ON THE FRONT PART OF THE TOP COVER.
REMOVE THE TWO SCREWS ON THE BOTTOM SIDE.
REMOVE THE ONE SCREW ON THE BACK.
TAKE OFF THE COVER.