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[time-freq] Reflock II N divisor question for 10 MHz ref114.200MHz Fin

Mike Suhar msuhar at woh.rr.com
Wed Aug 9 03:08:51 UTC 2006

That did the trick.  I had to increase the value of R22 on the op-amp to get
a little higher tuning voltage.  Around 17K gave me the 4.05 volts I needed.
The original 10K was just a little shy.  The VCO is now singing along at
114.200 000 Mhz






From: time-freq-bounces at lists.tapr.org
[mailto:time-freq-bounces at lists.tapr.org] On Behalf Of Luis Cupido
Sent: Tuesday, August 08, 2006 7:26 AM
To: TAPR time and frequency projects
Subject: Re: [time-freq] Reflock II N divisor question for 10 MHz
ref114.200MHz Fin


Hi Mike,


For 114.2MHz the configuration is

R=50 >> 100


N=570 >> 100111010


with fcomp=200kHz which is better than 100kHz for loop performance

and will allow a wider loop filter etc.


Luis Cupido.



----- Original Message ----- 

From: Mike Suhar <mailto:msuhar at woh.rr.com>  

To: time-freq at lists.tapr.org 

Sent: Tuesday, August 08, 2006 4:13 AM

Subject: [time-freq] Reflock II N divisor question for 10 MHz ref 114.200MHz


I am working on the Reflock II board using a 10-MHz reference.  That being
the case it appears I need to load the r2_flex_01.pof file.  I did that and
now it comes to setting the jumpers.  The "txt" file shows 3-bits are used
for the R divisor so I set 000 for 100 KHz.  For N I think I have a problem.
The frequency I need is 114.2 MHz.  That would be N = 1141 considering the
N+1.  From the txt file it looks like only 10-bits are being used.  If so,
the highest I can go is 1023 + 1 = 102.400 MHz?  


To test out my understanding of the jumpers I set N to 1017 which locked the
VCO at 101.800 MHz.  






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