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RADIO COMMUNICATION AUDIO FILTER - PRINTED PLATE
Popular radio-communication receivers are usually designed to receive several emissions and usually have simplified filters matched to receive the widest signal. For AM / FM modulation it is approx. 6 kHz, in single-ribbon receivers the filter has a width of 2.4-3 kHz. For telegraph signals this is too high - the operator's ear is exposed to a series of unpleasant sounds. The solution to the problem is to use an external audio filter. It makes the audio reception pleasant, regardless of whether it is SSB or CW.
The presented system has been developed on the basis of filters with a switchable capacity - MAX295 systems that can be obtained as free samples from the company MAXIM.
The device is especially recommended for amateur radio players
Selected parameters:
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Pre-installed Android4.4 or latest version for ODROID-XU3 and XU4. Ready to run out of box 8Gbyte eMMC Version 5.0 interface from Toshiba. JEDEC/MMCA version 5.0:HS400 interface with 8bit DDR mode
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RADIO COMMUNICATION AUDIO FILTER - PRINTED PLATE