[time-nuts] Help with my FTS4050...

[Chuck Harris]

Hi Bill,

Not yet, but it would be a good idea.  Way back when, when I
was last working on this unit (10 years ago) they were fine.
I know that all of the supplies that are external to the FTS5000
module are ok.  I just opened the case of the '5000 last night
before bedtime, so I haven't gone too far yet.

-Chuck Harris

Bill Hawkins wrote:
> Have you checked the power supply voltages?
> 
> Bill Hawkins
> 
> 
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]On
> Behalf Of Chuck Harris
> Sent: Saturday, January 08, 2005 9:01 AM
> To: Discussion of precise time and frequency measurement
> Subject: [time-nuts] Help with my FTS4050...
> 
> 
> Well, I dragged my FTS 4050 off of the shelf, and back to the bench
> to see what was left of it.  It hadn't been turned on since it quit
> in 1995.  It powered up ok, and the ovens stabilized at the proper
> values, and the beam current returned to where it was when things were
> normal.  It still won't lock, and the control voltage is stuck at 3.5V
> which I am pretty sure is its attempt to pull the OCXO up in frequency.
> The OCXO voltage control pot is fully CCW, and the frequency out is
> just a tiny bit below 5 MHz... All consistent with an OCXO that has
> exceeded its adjustment range for aging drift.
>