SCA1
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4
INTRODUCTION
The Ramsey Subcarrier Adapter kit allows you to hear the commercial free
background music that is broadcast along with some commercial FM signals.
This is accomplished by connecting the SCA1 to a standard FM broadcast
receiver tuned to the local FM station which is providing the subcarrier
service. The SCA1 then acts as a second receiver tuning in subcarrier
signals that are modulated along with the regular FM broadcast
programming. Be aware that not all cities have FM stations that transmit
SCA subcarrier signals, but if any are there, the SCA1 will find them!
While this kit can be easily assembled using our step by step instructions,
the actual connection to a FM receiver can be quite complicated and should
only be attempted by a qualified technician. This interconnection will be
described later in more detail. If you decide not to delve into your existing FM
receiver, we offer an FM broadcast band receiver with SCA baseband
demodulator output (model FR-1) which allows an easy, one step hookup for
the adapter.
Due to the myriad of different receivers and possible combinations that can
be encountered, Ramsey regrets that it cannot assume any responsibility for
connection to your FM receiver, or to provide any more specific information
than that which is provided in this manual.
BUILDING YOUR SCA1 KIT
There are over 100 solder connections on the SCA1 printed circuit board.
That means your work could be 99% perfect and you could still have 1 or 2
poor solder joints or solder bridges. Please take us seriously when we say
that good soldering technique is essential to the proper operation of your
subcarrier demodulator. Here are a few tips for a trouble-free assembly:
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Use a 25-50 watt soldering pencil with a clean tip.
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Use only rosin core solder intended for electronic use.
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Use bright lighting. A magnifying lamp or bench-style magnifier
may be helpful.
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Do your work in stages, taking breaks to check your work.
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Carefully brush away wire cuttings so they don't lodge between
solder connections.