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What is Inside of My ES Series
Transmitter?
We start with your Direct
Digital Synthesis (DDS) digital exciter. This
exciter generates the FM signal using an amazingly
high speed D to A converter. The output signal
and waveform are sent to the DDS encoder chip from
the main processor. The DDS output is buffered
and amplified in several stages until it reaches
around 5W of power. In addition to
creating the basic FM signal, the exciter also
contains a digital stereo generator, composite &
subcarrier analog audio inputs, and left and right
balanced audio. FSK signalling for FM
translator legal IDs is also sent to the DDS chip
from the CPU.
What goes into a DDS
Exciter?
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Below is one of our DDS
Exciters. As you can see, a lot goes into it
so that you can get a lot out of this exciter.
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The exciter feeds the RF Power amplifiers. In
the ES series, the exciter directly feeds the power
amplifier. The PA uses a MRF1K50 or MRF1K80
final transistor. These transistors are very
efficient and are conservatively rated at more than
1,000W. The most that we ever ask from these
devices is around 800W, so there's plenty of safety
headroom left, even at maximum output.
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