[App_rpt-users] GPS Locked MACTRAC

[Doug Bade]

The reflock does not have it's own oscillator, it sniffs the tcxo as an 
input and has a dc output to control the comp line or such of the tcxo 
osc. It has an additional input for the ref osc like 10mhz gps etc... 
The boards function is to have 2 pll oscillators based on the 2 
frequencies of input and scaled, to mathematically lock to each 
other...and keep it mathematically locked. In general it should at most 
introduce a little jitter but should be no phase noise that I am aware of..
It does not replace your tcxo it just watches it and controls it..

Doug
KD8B


On 1/4/2013 8:16 PM, Ken wrote:
>
> One thing you should be aware of is that replacing a crystal with a 
> reflock, or similar, will increase phase noise and spurious outputs of 
> the attached PLL. In FM this will probably show up as reduced adjacent 
> channel rejection. If you are not in a dense-signal environment, this 
> may not be an issue. In any case, you need to adjust the level of the 
> replacement signal into the PLL carefully for minimum crud generation. 
> Watching the output of the PLL on a spectrum analyzer would be a good 
> idea.
>
> 73
>
> Ken
>
> *From:*app_rpt-users-bounces at ohnosec.org 
> [mailto:app_rpt-users-bounces at ohnosec.org] *On Behalf Of *Randy Neals
> *Sent:* Friday, January 04, 2013 7:30 PM
> *To:* Ron Simpson
> *Cc:* app_rpt-users at ohnosec.org
> *Subject:* Re: [App_rpt-users] GPS Locked MACTRAC
>
>
> I'm also interested in locking a transmitter frequency to stable 
> reference.
> The ICOM FR-6000 repeater which I use has a TI LMX2352 PLL which 
> relies on a 15.3 MHz Crystal Resonator, CR-826 type.
>
> It appears that I might be able to replace the crystal with a reflock 
> board (Link below), with the reflock generating the 15.3 MHz.
> http://www.qsl.net/ct1dmk/reflock.html
>
> Here is an example of a ham reflock'ing a yaesu 817 all-mode radio to 
> a 10 MHz reference input
> http://www.vk3hz.net/riglock/FT817_External_Reference.pdf
>
> The 10 MHz reference signal can be from a Rubidium Oscillator or from 
> GPS Disciplined Oscillator, both of which are available from eBay.
> The Trimble Thunderbolt is a common GPSDO. Some good general info is 
> on John's web site: http://www.ke5fx.com/tbolt.htm
>
>
> 73,
>
> Randy - VE3RWN / W3RWN
>
> On Wed, Jan 2, 2013 at 12:22 PM, Ron Simpson <n6gkj.cm98 at yahoo.com 
> <mailto:n6gkj.cm98 at yahoo.com>> wrote:
>
> Hey guys, Happy New Year!
>
> Looking for ideas to cleanly phase lock a MAXTRAC. I have the boards, 
> I have an idea on how I want to do it. Just would like input from 
> those who already have done it. I looked online for some info but 
> found nothing.
>
> I can break the ref osc tune line and take that signal out. I can pick 
> off the 14.4 mhz and bring that out, but I want to do it cleanly, not 
> a hatchet job.
>
> Anyone have pics?
>
> 73,
> Ron, N6GKJ
>
> Sent from Yahoo! Mail on Android
>
>
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