Re: [Discuss-gnuradio] How many multiple/simultaneous PLLs can I have running on USRP2?

[LD Zhang]

I guess there may be an issue that since different PLLs will lock up at different time, so there are unknown amount of initial phase offsets for each PLLs. Would love to know if there are any ways around that.

 

LD

 

From: LD Zhang [mailto:address@hidden
Sent: Wednesday, May 08, 2013 3:32 PM
To: 'Marcus D. Leech'; 'address@hidden'
Subject: RE: [Discuss-gnuradio] How many multiple/simultaneous PLLs can I have running on USRP2?

 

Thanks for your prompt answer. I have a 1MHz band of signals from which I would like to extract say 30 carriers. Is it possible to set up say 30 PLLs in the flow graph and each will extract its own phase (and locked frequency), and there are no additional phase offsets between/among the different PLLs? What I mean by phase offsets is that the different PLLs preserve the original phase relationships in the original 1MHz band of data stream. Is it difficult or easy?

 

Thanks much,

 

LD

 

From: address@hidden [mailto:address@hidden] On Behalf Of Marcus D. Leech
Sent: Wednesday, May 08, 2013 3:27 PM
To: address@hidden
Subject: Re: [Discuss-gnuradio] How many multiple/simultaneous PLLs can I have running on USRP2?

 

Dear Community,

 

I have a question: I want to run multiple (as many as possible) PLLs that track the phase of multiple carriers in my band using the USRP N210. How many can I have running in real time simultaneously? If I use the phase from these loops, are there unknown (gotcha) phase offsets between/among them?

 

Thanks for reading,

 

LD

Could you clarify your question?

Do you mean software PLLs in a Gnu Radio flow-graph?  As many as you want until your computer runs out of steam.

-- 

Marcus Leech

Principal Investigator

Shirleys Bay Radio Astronomy Consortium

http://www.sbrac.org