[time-nuts] FE-5680A Question

Bob Camp lists at rtty.us
Mon Feb 13 19:56:07 UTC 2012


Hi

For what ever reason, most of the FE's sweep down to about 200 to 250 Hz
low. Few sweep more than 50 Hz high. I have one unit that locks fine and
only sweeps 5 Hz high.

Yes, I would open it up and re-tune. I think I would only bump it about 50
Hz or so. I have no idea *why* they are all tuned low, but there may be a
reason (like avoiding a false lock).

Bob  

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Erno Peres
Sent: Monday, February 13, 2012 2:17 PM
To: time-nuts at febo.com
Subject: Re: [time-nuts] FE-5680A Question


Hi Chris,

thanks for the info. My second problem is that the unit is in locked
position
after powering up.... but after about 5-8min  the freq goes down slowly
about 9.999.997.3 Hz and the lock ind level is still low.....
Also noticed that during the sweep  the max freq is 10.000.004 Hz and the
min freq is 9.999.750 Hz..
I assume that I have to open up the unit and try to re tune  the 10Mhz sweep
osci...... let say  from  9.999.900  to 10.000.100 at least.
Any suggestion????

Thanks and regards,
Ernie.




-----Original Message-----
From: Chris Albertson <albertson.chris at gmail.com>
To: Discussion of precise time and frequency measurement
<time-nuts at febo.com>
Sent: Mon, Feb 13, 2012 7:32 pm
Subject: Re: [time-nuts] FE-5680A Question


> From the label I can see it requires +5 Volt but no info about the 
S232.......
 Can I adjust the " C " field from the DB9 connector....????
On the units that require 5V you can adjust the frequency using rs-232
ut only within a very small range around 10MHz.      Some of the
ocumentation applies to other types of this same model oscillator.
Chris Albertson
edondo Beach, California
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