[CQ-Contest] Click, click, click...

Pete Smith n4zr at contesting.com
Sun Feb 25 12:57:30 EST 2001

At 04:56 PM 2/25/01 -0800, Michael Tope wrote:
 >If the output frequency of the trasnmitter is steady, then, yes, the signal
 >bandwidth is a function of rise and fall time. If on the other hand, the
 >output frequency of the trasnmitter is still changing while the output
 >envelope is rising, then the envelope shape may not tell the whole story.
 >If for example, as Tom suggests, the transmitter and receiver share a
 >frequency synthesizer and there is a frequency offset between receive
 >and transmit frequencies that requires the synthesizer to be reprogrammed
 >or shifted when switching between transmit and receive, then it possible
 >for the transmitter frequency to be still in the process of settling-in when
 >the transmitter is turned on (synthesizers tend to oscillate about
 >their target frequency for a few cycles of their natural frequency after
 >they change frequency) .
Would it be feasible to use the same test setup that ARRL uses for
composite noise, but key the transceiver at a standard rate, both with and
without a standard transmit/receive offset, and look for spikes?

73, Pete N4ZR
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