[Premium-Rx] Synthesizer Phase Jitter.

[Carcia, Frank A. HS]

Hi John,
Thanks for the information. I wonder why the spec for the 6790 is so loose.
My numbers were directly read off the screen without taking any correction
for bandwidth. I will assume you have the procedure and set up your spectrum
analyzer for the same bandwidths.                          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
>
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