| Operation of the FRG
7700 is extremely straightforward. However, the owner should read the pages to
follow carefully so as to derive maximum performance from this equipment.
Before attempting operation, make certain that all power, antenna, and ground
connections have been made correctly. |
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| FREQUENCY
SELECTION |
| |
| The operating frequency
is read directly from the digital display. All digits of the operating
frequency are displayed, with resolution to 1 kHz. The BAND switch is
calibrated in 1 MHz steps, from 0 MHz through '_9 MHz, with an additional 10
steps being provided for instant presetting to the bands containing the amateur
radio (ham) bands. |
| |
| To select a frequency,
first set the BAND switch to the desired 1 MHz segment, then rotate the main
dial to select the last three digits of the frequency. A coarse frequency
determination may also be made through the main dial window, which is
calibrated every 10 kHz. |
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| AM BROADCAST
RECEPTION |
| |
| (1) |
Virtually all commercial broadcast
stations in the MF and FIT bands use the AM (Amplitude Modulation) mode of
operation. To begin, turn the power switch on, and set the mode switch to AM M
(AM mode, medium bandwidth). |
| |
| (2) |
Tune in an AM station to the point
where the S meter reading reaches a maximum. |
| |
| (3) |
If there is very heavy
interference, you may wish to set the mode switch to the AM N (AM mode, narrow
bandwidth) position. Thin will provide maximum rejection of adjacentfrequency
interference. although the narrower bandwidth will cause some rejection in
fidelity. Conversely, if there is very little interference, you may switch to
the AM W (AM mode, wide bandwidth) position. This will provide maximum fidelity
because of the wider bandwidth. |
| |
|
| (4) |
The TONE control on the front panel
may be used to vary the audio response characteristics of the receiver. For
example, if you are troubled by a high pitched "heterodyne" signal, rotate the
TONE control in a counterclockwise direction to reduce this interference . |
|
|
| (5) |
When extremely strong signals are
encountered. the operator may want to reduce the level of these signals. Rotate
the ATT (At control on the front panel clockwise to reduce the strength of the
incoming signals. Should you desire to activate a fixed 20 dB attenuator set
the rear panel ATT switch to LOCAL. For most listening, though, leave this
switch set to the DX position. |
| |
| (6) |
For reduction in impulse type noise
(automobile ignition, etc.), push the NB (Noise Blanker) switch. This circuit
is highly effective in minimizing this type of interference, although no noise
blanker can be expected to eliminate all types of noise. |
| |
| (7) |
An Automatic Gain Control (AGC)
circuit is included in your FRG 7700. This feature keeps signal strengths
adjusted to a constant level under conditions of fading. When rapid fading
conditions are encountered, you may want to set the AGC switch to FAST, as the
use of the SLOW position might cause a weak signal to be obliterated by an
adjacentfrequency station which is much stronger. With some experience, the
operator will soon learn the proper settings of the MODE and AGC switches for
operation under a variety of conditions. |
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| AMATEUR RADIO (HAM)
BAND RECEPTION |
| |
| Amateur radio operators
use a variety of operating modes on the HF bands. However, your FRG 7700 is
well equipped to receive the various types of ham signals encountered in day to
day operation. |
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| SSB Voice Signals |
| |
| (1) |
Amateur radio operators use lower
sideband (LSB) 1 on the bands below 10 MHz, and upper sideband (USB) above 10
MHz. Set the mode switch accordingly. |
|