[Premium-Rx] Synthesizer Phase Jitter.

[Carcia, Frank A. HS]

	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