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FM receiver is tuned to the same frequency would be silence. After approximately 10 seconds of silence the
handset should begin to 'chirp' periodically with a short 1Khz tone that repeats every 5 seconds. This indicates
that there is no audio input and reminds the user that the feature is on.
The Phoenix FMTx 2.0 panel can be used to control the following features;
• Set the FM frequency to transmit on (88.1 to 107.9MHz).
• Select Stereo or Mono mode (generally all Nokia handsets will only use stereo)
• Mute both left and right audio channels.
• Mute only the left or the right audio channels.
• Allow an internal tone to be generated and transmitted from the Si4713 device. The audio frequency of
this tone can be selected along with the on/off time and the volume of the tone. Selecting 0 (zero) in either
the on or off time will produce a continuous tone.
• Obtain a list of suitable 'quiet or free' channels. This effectively performs an RSSI (RPS) scan to locate quiet
channels to transmit on. If the 'AutoJump' tick box is checked then this list will be transmitted to the FM
receiver to allow the handset to perform AF jumps. This is dependent on the Nokia handset and if the FM
receiver is RDS capable. The use of AF feature allows an RDS capable FM receiver to follow the transmissions
of the FM transmitter automatically.
• FMTx 2.0 status panel. This provides information on the state of the FMTx feature. This can be polled by
Phoenix at regular intervals defined by the user when the 'Read periodically each...' check box is checked.
The status can otherwise be read at any point by clicking on the 'Read' button. The MCC value is the 'Mobile
Country Code' and provided the phone is registered on a network will provide the code pertaining to the
country in which it resides. The antenna tuning value is a good indicator of the state of the antenna and
the other components connected to the TXO pin. The tuning values should be in the range 0 – 80. Any
value outside of this range will indicate some problem with the components connected to the TXO pin
(including the antenna). In the case of a removable antenna, the cause of the out of range value is like to
be because of a poor antenna connection. This might be because of broken or dirty connections between
the handset and the cover in which the antenna is fitted.
• The RDS panel can be used to set the PS name and/or to enter a Radio Text (RT) string. If access to an FM
receiver is available that supports RDS then these strings can be observed on the display of the FM receiver.
Page 7 –16
COMPANY CONFIDENTIAL
Copyright © 2008 Nokia. All rights reserved.
RM-235
FMTx 2.0 troubleshooting
Issue 1
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