APPLICATION NOTES
This note will discuss DC Power sources and how they relate to 12 volt products.
General Specifications
Our general specification for the voltage range of operation is 10 to
16 volts DC .
Voltage
The voltage of a fully charged battery ( engine not running ) is approximately 12.5 VDC. Once a load (items being powered represent the "load" ) is applied , the voltage will drop. How much the voltage is reduced will depend on the following:
1.Current draw (amount of amperage) The higher the draw the greater the voltage will drop.
2.The size and length of the conductor (wire) supplying power.
Converters
Many boats incorporate convertors as a source for 12VDC when connected to shore power
clean DC supply where others may have a | considerable amount of AC | ||||
ripple noise under maximum load. |
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| This | AC ripple noise is filtered | by the | boat battery | when connected |
into | the | circuit , but when the battery is | disconnected | the amount of | |
AC | ripple noise can create major | problems for audio | products. Noise | ||
may | result and the line fuse may fail |
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Ignition systems
Unwanted noise generated from ignition systems used to be a big problem. However, with more sophisticated filtering circuits designed into audio/video products, these problems are not as wide spread
Changes in wire harnessing also has contributed to the decline of application problems. Use the same ground point for all related products. This will greatly reduce the potential for unwanted noise.
"We have a complete line of audio and video products specifically designed for the Marine and RV market. Please contact ASA at www.asaelectronics.com for a view of our
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AM ANTENNA TRIMMER ADJUSTMENT
The antenna trimmer can be accessed through the small hole behind the cassette door (see diagram below). Tune radio to a weak station between 1200 and 1400 KHz AM ( If you cannot find a weak station in this range, tune to any other strong station, and adjust tuning slightly off station).Adjust trimmer for maximum volume.
FRONT VIEW OF RADIO
ANTENNA TRIMMER (NOTE:
OPEN CASSETTE DOOR TO SEE
THE ADJUSTMENT SCREW)
SPECIFICATIONS
Size: | 7''(W) x 2''(H) x |
Operating Voltage: | 12VDC,Negative Ground |
Output Power: | 50Watts Max .Stereo Power |
Output Wiring: | Floating Ground type designed for 4 speakers use.May |
| also be used with 2 speakers. |
Output Impedance: | Compatible with 4 or 8 ohm speakers. |
Tuning Range: | |
| |
Sensitivity: | (AM) less than 25uV |
| (FM) less than 5uV |
FM Stereo Separation: More than 23 dB | |
Frequency Response: | |
Wow & Flutter: | Less than 0.3% |
CARE & MAINTENANCE
Cassette
Always check that the tape is tightly wound inside the
Cleaning of Tape Head & Capstan
Since tapes contain oxides, you will find a black residue builds up on the tape head and drive capstan ( inside cassette door ). These residues should be cleaned after
De-Magnetizing
The movement of the magnetic tape head and metal parts cause a magnetic field to develop. We recommend you have the tape player demagnetized at least twice annually. You can purchase an inexpensive tape head demagnetizing tool to do this yourself.
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