— 15 —
Item Number 31 is the station “short name,”
which in this illustration is being sent during a
commercial cluster. As in Menu 8, if the tag is
too long for the LCD, push the jog wheel and
turn it to scroll through the entire text. Push
the knob again to resume menu navigation.
RDS Reception Notes
The Inovonics 632 receiver utilizes an all-digital RF ‘front
end,’ which not only demodulates both the FM and HD Ra-
dio carriers, but decodes the FM RDS and HD PADS data as
well. One idiosyncrasy of this circuit topology is that RDS
data for FM broadcasts may be corrupted by an RF input at
an abnormally high level. If the RDS data is erratic or gar-
bled, it may be necessary to insert a pad in the antenna
lead.
If an incoming signal is so strong as to cause RDS decoding
problems, a 20dB attenuator should resolve the issue with-
out compromising system SNR. Suitable ‘F’-connector at-
tenuators are available at low cost from CATV equipment
suppliers. For example, Part No. 33-2780 from MCM Elec-
tronics; www.mcmelectronics.com.
HD Radio Menus
Menu 6
HD NAME
identifies the radio station, usually
with call letters, such as
KHHT-FM
.
HD TYPE
describes the programming format
of the station. The display might show
ADULT
HIT MUSIC
,
SPORTS
or
RELIGIOUS
.
Menu 7
HD ARTIST
identifies the performer of the
song that is playing at the moment. Press the
knob and then turn it to scroll through the
name of a group that overruns the LCD dis-
play. Press the knob again to exit this menu.
Menu 8
HD TITLE
names the song that is playing.
Press the knob to scroll through a title that
exceeds the LCD display capability, turn the
knob to see the entire text, and then press the
knob again to exit this menu.
— 16 —
Section IV
TECHNICAL MATTERS
Firmware Version
With the 632 powered-up and operational, hold down the
jog wheel knob for 5 to 10 seconds. The menu screen you
have been viewing will be replaced by the
632 Firmware
screen. This shows the firmware version installed in your
unit. This information may prove important when com-
municating with the factory. Other screens in this menu
subset contain version information specific to the HD Radio
receiver subassembly.
Next, navigate back to the
632 Firmware
screen. Push the
knob once again to return to the regular menu tree for nor-
mal operation.
‘Under The Hood’
The Model 632 receiver is simple and small, utilizing mostly
surface-mounted (SMD) components. Many of these are
‘application-specific’ and/or pre-programmed at the factory,
but all of them are impossibly tiny. This pretty-much pre-
cludes servicing the unit in the field. For these reasons, and
also because of the small format of this manual, we have
dispensed with schematic diagrams, servicing instructions
and a listing of component parts.
Having said that, our policy has always been one of ‘full dis-
closure.’ We feel that, unless we are doing something un-
derhanded, there should never be a reason to hide infor-
mation from the user. With a clear conscience, and upon
request, we will cheerfully provide additional documenta-
tion and divulge all but the very darkest secrets concerning
any Inovonics product.
Because it is so small and light, returning the 632 receiver
for factory servicing or firmware upgrades is an option that
we encourage. Inovonics has never considered factory re-
pair charges a significant source of revenue, and we are
confident that you will be astonished at how reasonable our
rates actually are!
