[time-nuts] 5370A vs 5370B

[John Allen]

Hi Mark - do you have a source or part number for the fan?  I seem to remember
that the manuals says 35 or 37 cfm.

Thanks,

John K1AE

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On Behalf
Of Mark Sims
Sent: Tuesday, March 09, 2010 11:30 PM
To: time-nuts at febo.com
Subject: [time-nuts] 5370A vs 5370B


99.95 ns is a typical number for the period reading at minimum gate time.   Set
the gate time to 1 sec.  My 5370A shows 99.999 999 9650 +/- 50 at 1 sec gate
time.

>From my experience it can take at least a couple of months of continuous
operation for the oscillator in an unused 5370 to stabilize its drift rate.
Once stabilized,  the 10544A's in the 5370A seem to be much LESS drifty than the
10811's in the 5370B.There are three mods that I do to all the 5370s that cross
my path.  First I replace the fan with a 12V 120 ma brushless DC fan driven by
the 10V supply.   Second I drill a hole in the top of the case over the
oscillator tuning control.  Third,  I add a switch to the oscillator buffer
board to disable that STUPID oscillation detected LED that spew put 5 MHz noise
all over creation.  I also disassemble and clean those slide switches on the
front panel. 		 	   		  
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