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VE2HAR > MT63 14.03.05 15:55l 192 Lines 5474 Bytes #-7299 (0) @ WW
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Subj: Re: [MT63] Re: Crest Factors
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Date: Mon, 14 Mar 2005 07:17:30 -0700
Subject: Re: [MT63] Re: Crest Factors
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Thank you.
Steve
Mark Miller wrote:
> I was not able to measure the MT63crest factor with my spectrum
> analyzer. The problem was getting it to show peak power. It measures
> average power just fine. My setup was an ICOM IC-746 pro feeding a Bird
> 4431 (model 43 with a sampling port). The attenuation from the sampling
> port to the spec an was 72 dB. My transmitter was set up to provide 40
> watts with a single tone input. The Bird showed 8 watts average when
> transmitting MT63 sending a file of text. Using the method I
> described in
> earlier posts, my PEP was 40W. My peak to average ratio or envelope
> crest
> factor was 5 (7 dB).
>
> I have the spec an screen capture at
> http://home.comcast.net/~mdmiller7/crest_factor/MT63.gif
> <http://home.comcast.net/%7Emdmiller7/crest_factor/MT63.gif> which
> shows the
> basic spec an setup. This is not the setup for channel power.
>
> 73,
>
> Mark N5RFX
>
> At 04:42 PM 3/13/2005, Steve Friis wrote:
>
> >Cool! Post the captures please.
> >
> >Steve
> >
> >Mark Miller wrote:
> >
> > > Thanks Tomi, Steve and Paul for the information, it certainly helps me
> > > understand what is going on with MT63 and other complex modes. I
> agree
> > > that my scope was one of my limiting factors, perhaps a storage scope
> > > could
> > > catch those peaks that I missed. I do have an Anritzu S332D spectrum
> > > analyzer that has a peak hold feature and can automatically measure
> > > channel
> > > power. I will fire it up and see what I get.
> > >
> > > 73,
> > >
> > > Mark N5RFX
> > >
> > >
> > >
> > >
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