[time-nuts] Changing FE-5650A frequency?

Robert Atkinson robert8rpi at yahoo.co.uk
Sat Apr 20 05:02:55 EDT 2013


Hi Alec,
Well done and thanks for the credit. I had not looked under the board for the crystal or spotted the divider.
One comment. in your blog and ebay description you say that the unit runs on 15V. The "M" suffix 5650A is actually designed for a normal aircraft 28V DC supply (typical specification range 22-32V). It may run on 15V but it may be stressing the power supply circuit and / or under-running the oven. The external (28V) supply to the Marconi unit is just filtered, switched and connected to the FE-5650A without regulation. It appears that these units have options 08, 09, 22 and 25 rolled up into the "M" military suffix. By the way, these units can cost $10,000 or more each for specials see http://www.dlis.dla.mil/webflis/pub/pub_search.aspx

Robert G8RPI.




________________________________
 From: Alexander Wright <alecjw at gmail.com>
To: Discussion of precise time and frequency measurement <time-nuts at febo.com> 
Sent: Saturday, 20 April 2013, 2:33
Subject: Re: [time-nuts] Changing FE-5650A frequency?
 

Success! I've managed to set mine to 10MHz. I've documented this on my blog: http://blog.m0tei.co.uk/post/2013/04/20/Mystery-Aircraft-Parts-and-Atomic-Clocks

Thanks to those who offered suggestions.

Regards
Alec
_______________________________________________
time-nuts mailing list -- time-nuts at febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.


More information about the time-nuts mailing list