5a-12
Theory of Operation
A6 Output (8648B/C/D)
A6 Output (8648B/C/D)
The A6 output module works in conjunction with the A10 frequency extension module and
differs from 8648A operation in the following ways:
1. AM is input to the output module only for frequencies ≤ 1000 MHz. For higher
frequencies, this signal goes to the A10 frequency extension module.
2. The ALC detector voltage for all frequencies (not just > 1000 MHz) is now generated on
the A10 frequency extension module.
3. The range of the RF input to mixer in the a6 Output has been changed to allow the
mixer to output signals between 9 kHz and 249 MHz to the a10 frequency extension
assembly.
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