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[time-freq] Reflock II programming??

Luis Cupido cupido at mail.ua.pt
Sun Mar 25 22:07:41 UTC 2007


Hi Chris,

 > Luis can correct me if I'm wrong, but the N jumpers need to be set to
 > the N divisor minus 1 for the r2_flex_01 configuration. Hence, the
 > jumpers need to be set to 1110111111b.

Yes correct, I felt like confirming this since this has been a source
of confusion in the past.

 > In addition, you need to select the comparator that is fed to the LPF;
 > you will want a jumper at the PD1 position.

Up or Down depending if the VCXO is positive or negative slope
control.


Luis Cupido.
ct1dmk.



Christopher T. Day wrote:
> Russ,
> 
> Actually, since I was just doing this for someone else, I think what you
> would need is an R divisor of 50, 10MHz/50 = 200kHz, and N divisor of
> 960, 192MHz/960 = 200kHz. This would give up a comparison frequency of
> 200kHz which is above the cutoff of the loop filter, which is 100kHz,
> i.e., the filter should work fine since you're after the "DC" component.
> 
> However, the jumpers for R do not correspond directly to the division
> ratio. They only select one of a discrete set of predefined divisors.
> Setting the R jumpers to 100b selects a divisor of 50.
> 
> Luis can correct me if I'm wrong, but the N jumpers need to be set to
> the N divisor minus 1 for the r2_flex_01 configuration. Hence, the
> jumpers need to be set to 1110111111b.
> 
> In addition, you need to select the comparator that is fed to the LPF;
> you will want a jumper at the PD1 position.
> 
> 
> 	Chris - AE6VK
> 
> 
> P.S. - Contact me off list as I could program this for you.
> 
> 
> -----Original Message-----
> From: kb8u vhf [mailto:kb8u_vhf at hotmail.com] 
> Sent: Sunday, March 25, 2007 11:29 AM
> To: time-freq at lists.tapr.org
> Subject: [time-freq] Reflock II programming??
> 
> I have a 10Mhz OCXO and want to connect it to a DownEast Microwave weak 
> signal source (a 192 Mhz oscillator with some multipliers to 1152 MHz + 
> harmonics out).  Somewhere I have a bookmark to a mod. to convert the
> 192 
> crystal oscillator to a VCXO (I haven't dived into that yet).
> 
> I built the TAPR kit of the Reflock II but I'm not sure of the next
> steps 
> neede to make it tick.
> 
> Can someone point me to an inexpensive JTAG programmer and software?  Or
> 
> better yet, is there some kind soul I could ship it to that would be
> willing 
> it program it for a nominal fee?  I'd prefer not to buy something and
> spend 
> the time learning how to use it for just one part one time.
> 
> How about setting the jumpers?  I think for 10 and 192 Mhz I need R=5
> and 
> N=96, yes?  Any other jumpers to set?
> 
> Thanks, Russ KB8U
> 
> P.S. sorry if this has been covered in the past, the web page to search
> the 
> archives of this email list is broken.
> 
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