How about a "digital" signal consisting of a FM square wave?  You
transmit a carrier for a time coresponding to your max range.  The you
suddenly shift the transmit frequency by your IF frequency for the other
half of the 50% duty cycle square wave.  Echos from the first half would
be recieved by your IF during the second half and vice versa.  This
simple constant power binary FM signal would be hard to forbid as a
"pulse" emission,

Sherpa Doug

> -----Original Message-----
> From: Vasile Surducan [mailto:vasile@L30.ITIM-CJ.RO]
> Sent: Thursday, September 06, 2001 1:30 AM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [EE]: Definition of "pulse" - amateur radar again
>
>
> On Thu, 6 Sep 2001, Sean H. Breheny wrote:
>
> > Hi all,
> >
> > This is a question which is an extension of the amateur
> radar discussion
> > which I started a while back. I have been looking around at what is
> > available out there and it seems as though X band (10GHz)
> would be the best
> > place to start. I noticed, though, that the FCC doesn't
> allow amateur
> > operations in the 10GHz band which use the "pulse" emission
> type. Roughly
> > speaking, I would think this would rule out most types of
> range-reporting
> > radar. However, I'd like to know exactly what is defined as
> pulse? For
> > example, if I were to maintain a constant output power, but
> FM modulate the
> > output so that there was a quick ramp in frequency (say a
> microsecond long)
> > followed by a drop in frequency where it sat for a
> millisecond, and then
> > the whole thing repeated over and over, would this be
> considered a pulse
> > emission?
> >
>   Yes. Could you tell us what output power range are you thinking at ?
>
> Cheers, vasile
>
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>

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