Expert Technology Studios LLC BST1 Manual De Usuario
14
Any time a desired signal decreases in level such that the S meter drops to S - , then receiver
audio will be muted after 2 seconds.
4.15 SLEEP MODE
If none of the key fob buttons have been pressed for about 2 hours, the BST-1 will shut down
and enter a sleep mode with lower current consumption (15 ma). It may be awakened by
momentarily pressing any button.
It will respond with the RDS message VER 0XXX, were XXX is the version of the software
installed. It then will resume operation on the last tuned frequency with Mode selection, tuning
direction, sensitivity level and last FM channel retrieved.
4.16 TUNING RANGE
The RF filtering is optimized for shortwave coverage from 2.5 to 25 MHz. However, the BST-1
will tune from 155 KHz to 30 MHz but with reduced sensitivity due to the front end filtering
designed to only pass the 2.5 to 25 MHz range. Very strong local AM broadcast and long wave
beacons may be received if very close to the stations. To access these out-of-band frequencies,
enter TUNE mode and scan up or down until you reach the desired frequency. With the
exception of frequencies below 255 KHz, these out-of-band frequencies may also be saved to
PRESET memory. Frequencies below 255 KHz appear to the memory selecting software as
empty channels and thus will not be saved.
4.17 EMI REDUCTION
Due to the complexity of the digital circuits, on some very few tuned channels, there may be
heard a low level pulsating noise from the internal circuits of the BST-1. This can be eliminated
by "shifting" the oscillators within the BST-1 when operating on that frequency. With the BST-1
in TUNE mode, once a desired channel is selected in the tune mode, press the bottom button
for one "beep" to toggle between up and down tuning. One of these two tuning directions,
either up or down, should yield a signal with no interference. Once this condition is obtained,
then STORE the frequency by holding the top button down for about 5 seconds through the 1, 2
and 3 "beep" annunciations until the STORE message (Morse code letter "S") is heard.
Now, whenever this frequency is tuned in the PRESET mode, the clock shift chosen to give no r
minimal interference will be automatically selected. If there is ever any residual pulsating noise
that cannot be eliminated in this matter, then on that PRESET channel, simply annunciate Morse
Code frequency (hold top button for 2 "beeps") and the "S Meter" reading will be halted on that
channel and any pulsating EMI should also be eliminated.
4.18 KEY FOB RANGE
The key fob transmitter power and sensitivity of the key fob receiver within the BST-1 should
always provide adequate range in most vehicles. However, if the BST-1 is located in an area of
the vehicle such that there is high attenuation between its key fob receiver antenna and the key
fob, some intermittent control operation may be experienced. The location of the key fob may
be critical and the user may need to determine best operating position. The BST-1 may also be