Excluding Frequencies; Base Station With Fixed Frequency - Philips Avalon CTS M2720A Service Manual

7 Troubleshooting
Refer to the Service Support Tool Help for details.

Excluding Frequencies

Having established the occupied frequency ranges by scanning the available frequency range (see above),
you can exclude up to four frequency ranges by using a PC installed with the Service Support Tool.
Refer to the Service Support Tool Help for details.

Base Station with Fixed Frequency

There are instances when free channel selection is not desired, and the setting of fixed frequency for the
base station is preferable or necessary. For multiple cordless/telemetry installations in the same hospital,
especially when connected to an antenna system, the hospital should implement an RF plan. Each system
(adult telemetry, fetal telemetry, Avalon cordless), should have a fixed frequency reserved for it, and this
should be documented in a suitable way (for example, on an RF chart).
The setting of fixed frequencies is done using the Service Support Tool. Refer to the Service Support Tool
Help for details.
The frequency of a slot is separated from that of another slot from the same base station by channel
spacing. The base station is shipped with a default channel spacing appropriate for the country in
question, and normally this requires no adjustment.
If it there are transducers working close to each other from the same base station and the transducers are
interfering with each other (exhibited, for example, by a noise on the ultrasound channel), you can make
the channel spacing wider (only after consulting Philips Support). You can do this by changing the F-
settings using the Service Support Tool (refer to the Service Support Tool Help), or manually using the
configuration keys on the base station (refer to page 66).
The first slot allocates the base fixed frequency to its transducer. The frequency allocated by the second
slot to its transducer is the base frequency plus the channel spacing (whether default or user-selected). The
frequency allocated by the third slot is the frequency of the second slot plus the channel spacing.
Due to this way of allocating the frequencies to the second and third slots, avoid setting the base fixed
frequency for the first transducer slot at the very end of the available frequency range for your country,
otherwise it will not be possible to allocate a frequency channel to slots 2 and 3.
70
To Purchase, Visit Avobus.com
Slot 1
Frequency 'X'
(base frequency)
or call 1-800-674-3655
Slot 2
'X' + Channel Spacing
Excluding Frequencies
Slot 3
'X' + 2 x (Channel Spacing)