[Premium-Rx] Synthesizer Phase Jitter.

[John Reed]

----- Original Message -----
From: "Carcia, Frank A. HS" <francis.carcia at hs.utc.com>
To: "'John Reed'" <jreed at alum.mit.edu>; "Premium-Rx (E-mail)"
<premium-rx at ml.skirrow.org>
Sent: Wednesday, April 09, 2003 8:08 AM
Subject: RE: [Premium-Rx] Synthesizer Phase Jitter.

I don't have an R390 for testing, but here are the numbers for a Harris
RF-590.  Setup was the same as my RA6793A test and I duplicated the test
proceedures in the RA6790 manual:

50 Hz  -80 dBc
100 Hz  -88 dBc
200 Hz  -90 dBc
1 KHz < -90 dBc

The dynamic range of the test setup was 90 dB.

John Reed


> Hey All,
> How about one of you R390 drivers try running the same test and show us
> how clean that unit is. I think this procedure could be run on any radio
> with a BFO that is tunable. This is a very good test for whole radio
> performance. fc
>
> -----Original Message-----
> From: John Reed [mailto:jreed at alum.mit.edu]
> Sent: Monday, April 07, 2003 7:20 PM
> To: Premium-Rx (E-mail)
> Subject: Re: [Premium-Rx] Synthesizer Phase Jitter.
>
>
> Here are the results that I obtained by doing this measurement on an
RA6793A
> receiver:
> 50 Hz = -55 dBc
> 100 Hz = -65 dBc
> 200 Hz = -40 dBc (there was a spike in the spectrum at +/- 200 Hz, so this
> isn't strictly phase noise)
> 1 KHz = -70 dBc
>
> Test setup:
> Signal generator HP 8640B
> Receiver Racal RA6793A with LF extension
> Spectrum analyzer: HP 3580A audio
>
> John Reed
>
> ----- Original Message -----
> From: "Carcia, Frank A. HS" <francis.carcia at hs.utc.com>
> To: "Racal6790GM Moderator (E-mail)" <Racal6790GM-owner at yahoogroups.com>;
> "Premium-Rx (E-mail)" <premium-rx at ml.skirrow.org>
> Sent: Monday, April 07, 2003 12:03 PM
> Subject: [Premium-Rx] Synthesizer Phase Jitter.
>
>
> > Hi All,
> > I applied the Racal RA6790 phase jitter test to the RA6830
> > synthesizer. I looked at the
> > RA6790 test procedure and found it very similar to the RA6830. One
> > difference was the
> > phase noise test where the BFO is set to 8 KHz and a signal is
> > pumped through the
> > radio and the audio is monitored with a spectrum analyzer. My HP8552
> > / 8553 seems to
> > work well at 8 KHz after an hour warm up period. The test was
> > deleted from the RA6830
> > procedure. I checked 4 different synthesizer modules in 3 different
> > receivers. The result was
> > quite different than the RA6790 test specs. I would be interested in
> > some numbers from
> > a RA6790 radio.
> > FREQUENCY dBC RA6790 SPEC LIMIT RA6830
> > Measured
> > 100 Hz - 21 dBC - 60
> > to - 65 dBC
> > 200 Hz - 27 - 60
> > to - 65
> > 1 KHz - 42 - 60
> > 2 - 51 - 60
> >
> > ADDED TEST
> > 50 Hz N/A - 50
> > dBC
> >
> > All of the RA6830 modules were within a couple dB of the above
> > numbers. I checked
> > both synthesizer part numbers and both performed the same.
> > fc