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Re: [Discuss-gnuradio] Frequency Lock Times


From: Richard Bell
Subject: Re: [Discuss-gnuradio] Frequency Lock Times
Date: Fri, 4 Mar 2016 02:39:30 -0800

Ooops.

Rich

On Thu, Mar 3, 2016 at 8:35 PM, Marcus D. Leech <address@hidden> wrote:
On 03/03/2016 11:30 PM, Ian Buckley wrote:
errrrr 0.8mS is 1250Hz.....
We were told there'd be no arithmetic....




On Thu, Mar 3, 2016 at 6:30 PM, Richard Bell <address@hidden> wrote:
I see thanks. My BW is several hundred MHz wide, so no all DSP tuning for me.

Rich

On Thu, Mar 3, 2016 at 5:57 PM, Derek Kozel <address@hidden> wrote:
Also if your frequency hopping is within the analog bandwidth of the radio you may be able to use DSP tuning, which has almost instantaneous reactions.


On Thu, Mar 3, 2016 at 5:39 PM, Marcus D. Leech <address@hidden> wrote:
On 03/03/2016 08:35 PM, Richard Bell wrote:
I was reading in a separate thread that soon to be released UHD code will allow lock times on the order of 0.8 ms. Does this mean the fastest we should expect to get a frequency hopping radio to work is at a hop rate of 1/0.008 = 125 Hz?

Thanks,
Rich

With that particular radio, yes.

That was for the B2xx series and E3xx series, which are based on the AD9361/AD9364 chips, which were never really designed for
  fast frequency-hopping applications.

The other RF cards, like WBX, SBX, CBX have faster PLL synthesizers, so faster hopping is possible, although there are host-to-radio
  transaction times to consider as well.



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