However, very weak radio station signals may be sup-
pressed by the muting circuit. If such a very weak station
is in stereo it will have a high level of background hiss.
Switching to Mono Mode and disengaging the muting cir-
cuit by depressing the FM Mute/High Blend button will
allow the station to be heard and will cancel most or all
of this background noise.
In normal operation the mute circuit is engaged, and the
display indicates “FM MUTE.” Press the FM Mute/High
Blend button to disengage the muting circuit and switch
from stereo to mono reception. “FM MUTE” will extinguish
in the display. Also, “STEREO” will extinguish if a stereo
broadcast was received. Press the FM Mute/High Blend
switch again to return to Auto Stereo FM operation.
In combination with the Memory button [4] a preset
number can be emptied.
[4] Memory Button
The Memory button is used to store stations into the
Preset Memory (1-30 Presets on FM, 1-10 Presets on AM),
used in conjunction with the Down/Up [5] buttons on the
front panel. When Memory is active, the Preset number
flashes and the red “MEMORY” indicator is shown in the
Display Panel. If no other button is pressed within 10 sec-
onds “MEMORY” will stop flashing and the preamplifier
will default to its previous state.
To Store a Preset:
Tune to the radio station you wish to enter into a Preset.
If the station is transmitting RDS information, the RDS
indicator will light up and station initials will be shown in
the Display Panel. If a non-RDS station is found, then just
the frequency will be shown.
To store that station as a Preset, press Memory [4].
“MEMORY” and the preset section in the display panel will
start to flash. If no other button is pressed within 10 sec-
onds, “MEMORY” will stop flashing and the preamplifier
will default to its previous state.
Press the Down/Up [5] buttons to select which Preset
number you wish to assign to the station (from 1 to 30
on FM and 1 to 10 on AM), shown as a flashing number in
the Display Panel, and then press Memory [4] again. The
Memory light in the Display Panel will go out and the sta-
tion is now stored in your GTP-860’s memory.
To exit the Memory mode without storing a station, leave
all the tuner controls untouched; the Memory mode will
automatically cancel itself after 10 seconds. The Memory
Presets have a memory back-up, so they will remain
stored for several weeks even if the Preamplifier is
switched off or unplugged from the main supply.
NOTE: You can enter a new station into an unused Preset
or overwrite an existing programmed Memory Preset. By
doing this you will replace the radio station previously
held on that Preset number.
Deleting a stored Preset:
You can empty a Preset by deleting the stored information:
• Press Memory button [4]
• Select the Preset to be emptied by pressing the Up/
Down buttons [5].
Press FM Mute/High Blend button [3]. The Preset will then
be deleted and ‘—‘ appears as the Preset number.
[5] Tuner Up/Down Buttons
The function of these buttons depends on the tuning
mode selected with the Tune/Preset button [6]. The Tune/
Preset button toggles between the two operation modes:
a) Preset mode (indicated in the display area): Press the
Down button to scroll to a lower number Preset; press the
“ Up” button to scroll to a higher Preset number. This is
a “wrap-around” function, so that going from the high-
est number Preset, the tuner will go to the lowest Preset
number or vice-versa when tuning either up or down.
b) Tune mode: Press the “Up” or “Down” button for more
than 1/2 second to engage automatic tuning respectively
up or down the frequency band. The tuner will search
automatically for the first reasonably strong radio station,
where it will stop. Press the Down/Up button again for
1/2 second to start searching again.
NOTE: Automatic tuning is available on both FM and AM.
By briefly tapping the Down or Up buttons you can engage
manual tuning respectively down or up the frequency band
for precise tuning to a specific frequency. With each suc-
cessive tap of the keys, the tuner will take 0.05 MHz steps
on FM so you can accurately tune into the desired fre-
quency. For AM the tuning steps are factory set at 10 kHz.
This tuning mode can also be useful when trying to
receive a radio station which is too weak for the auto
8 | ADCOM GTP-860 OWNER’S MANUAL