Grundig 800 - Manual (Page 17)

18
GETTING STARTED,
cont'd.
The synchronous detector will lock to the strongest signal
that is within the IF passband when it is activated. Most of
the time, the strongest signal will be the carrier of the desired
signal. First, be sure the main tuning is set to within 1 kHz of
the desired station's transmitting frequency. Press the 'AM
SYNC' button to activate synchronous operation. If adjacent
channel interference or any other undesired signal is
sufficiently strong, the synchronous detector may lock to it
instead. In that case, press the 'AM SYNC' button again to
turn the synchronous detector off, and repeat the tuning
process. For severe cases of fading, set the audio bandwidth
to 4 kHz. If interference is present, press the SSB USBLSB
button to select the sideband with the least interference once
'AM SYNC' has been selected. If the interference is
sufficiently severe to prevent reception, select a narrower IF
bandwidth and retune to the desired signal. After reception
is obtained, select a wider bandwidth and/or alternate
sideband if desired. When 'AM SYNC' has been activated,
moving the TUNING knob will cause the SYNC circuit to
momentarily disengage (indicated by 'SYNC' flashing), then
back on again when tuning has stopped. AM SYNC does
not function on the AIR band, and will not operate properly
on intermittent transmissions such as those encountered on
CB radio, and AIR bands. For those types of transmissions,
use the AM mode. Press the AM SYNC button to turn
the synchronous detector off before selecting LSB or
USB modes.
SSB OPERATION
Tuning in a single sideband (SSB) signal can be somewhat
frustrating for the first time listener. In either of the SATELLIT
800 MILLENNIUM's SSB modes, LSB (lower sideband), or
USB (upper sideband), the receiver will select the 2.3 kHz
bandwidth automatically (the receiver may be programmed to
NOT automatically select a bandwidth. Refer to 'Automatic
Bandwidth Setting With Mode Selection DISABLE
(ENABLE)' in
, the 'Special Use Features and Functions'
section of this manual). Generally, LSB is used below 10
MHz and USB is used above 10 MHz. When initially tuning
in the desired station, tune slowly. If the station is
unintelligible, try the other sideband, again tuning slowly. A
station tuned in on the wrong sideband is totally
unreadable but a station mistuned on the correct sideband
may sound like 'Donald Duck'. Further tuning will result in a
more normal voice pitch.
FM OPERATION
FM reception is perhaps the easiest mode to use on the
SATELLIT 800 MILLENNIUM. The AGC and BANDWIDTH
settings are not used in FM. In fact, attempting to activate
these buttons will result in an 'ERROR' beep. All FM stations
in the U.S. end in an odd 100 kHz, i.e. 97.7 MHz, and are
spaced 200 kHz apart. The SATELLIT 800 MILLENNIUM
has the ability to tune in 20 kHz steps to allow tuning in
between stations to help eliminate interference to weaker
stations that could be covered up by stronger adjacent
stations. Additionally, when headphones or external
speakers are used, true stereo reception is possible. The
front panel stereo
indicator will light when a stereo station is tuned in.
The receiver will automatically switch to stereo and provide
left and right audio from the headphone jack, line output
jacks, or external speaker jack. If the headphones or
external speakers are removed while listening to a stereo
broadcast, the receiver will provide monaural audio from the
internal speaker, and the front panel stereo indicator will
disappear.
AGC OPERATION
The SATELLIT 800 MILLENNIUM provides the ability to
select a Slow or Fast AGC setting. Either of the two settings
will permit automatic control of the receiver's gain thereby
producing a constant audio output free of distortion.
Generally, the Slow AGC setting is preferred for reception of
AM and SSB signals. The Fast AGC setting allows more
rapid automatic receiver gain adjustment to quickly fading
signal levels. The AGC does not function in the FM mode.