EMRFD Message Archive 1009

Message	Date	From	Subject
1009	2007-09-03 20:30:56	Hari G	Adding a PLL for the POS200.
Wes/All ,               I would like to know if you ever tried using the POS 200 in a PLL arrangement with a DDS as the prog divider, i would like to know how easy it will be to do that and if there is any ref design available for that.The plan is to know the exact freq and to select so that along with the AD8307 its easy to plot the BPF. -- De Hari VU2GHB
1015	2007-09-06 10:52:56	Wes Hayward	Re: Adding a PLL for the POS200.
Hello Hari, et al, I have not done it, but it would certainly be a worthwhile project to add phase lock to the POS200 oscillator. It presently suffers from poor phase noise, and this is the dominant mechanism that does not allow you to go to much narrower resoluti
1016	2007-09-06 11:41:54	Hari G	Re: Adding a PLL for the POS200.
Wes ,     Sure i will update as i progess, four of the boards are ready need to drill and start soldering. My plan is to get things going and then sit and add an additionaI PLL and then get the plot on the PC as done by Scotty.   I will be using a 6Khz 10.7 Filter , my IF will be 10.7Mhz.   For phase comparator two options for me either i need to use the 7474 as given in EMRFD or a CD4046 , 10Khz or more will be my Ref freq.   Many Thanks  Hari       On 9/6/07, Wes Hayward <wesw7zoi@gmail.com> wrote: Hello Hari, et al, I have not done it, but it would certainly be a worthwhile project to add phase lock to the POS200 oscillator. It presently suffers from poor phase noise, and this is the dominant mechanism that does not allow you to go to much narrower resoluti