[time-nuts] Re: DIY Low offset Phase Noise Analyzer

[Lester Veenstra]

Thanks;
   That’s what I get for not keeping up with the state of the art.
Never the less, for the price (a lot less than the 5-6$ for the good stuff, it remains a viable part. True not LDO, and as I said, not for high power.  Way better than the 78xx-79xx utility solution.

Back in my days of PLL work, my bench was a battery, a 723, or a 78xx.  The 78xx dominated noise, but with the Specans of the time, not much practical difference between a battery and a 723.  However, today, in the "nut " environment, I grant the part can be retired. 

Lester B Veenstra  K1YCM  MØYCM  W8YCM   6Y6Y
lester at veenstras.com

452 Stable Ln (HC84 RFD USPS Mail)
Keyser WV 26726

GPS: 39.336826 N  78.982287 W (Google)
GPS: 39.33682 N  78.9823741 W (GPSDO)


Telephones:
Home:                     +1-304-289-6057
US cell                    +1-304-790-9192 
Jamaica cell:           +1-876-456-8898 
 


-----Original Message-----
From: Lux, Jim [mailto:jim at luxfamily.com] 
Sent: Wednesday, July 13, 2022 2:18 PM
To: Lester Veenstra; 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] Re: DIY Low offset Phase Noise Analyzer

On 7/13/22 8:48 AM, Lester Veenstra wrote:
> Do not forget the venerable 723 for a very low noise, low power. regulation.
>
> Lester B Veenstra  K1YCM  MØYCM  W8YCM   6Y6Y
> lester at veenstras.com
>
> 452 Stable Ln (HC84 RFD USPS Mail)


723 is around 2 uV noise..not bad, but the PSRR isn't nearly as good as 
the LT304X series.  And the max input voltage is higher on the 723 
(although you have to watch the dissipation)