With regards to the Whitebox switching times: Right now, it is the case
that the PLL parameters are the same for both tx and rx on the same
frequency. This works on 144/440/900MHz bands, but not 50MHz. The next
version it will be the same for 50MHz, too.
The CMX991 touts itself as usable for "APCO Project 25 (P25) Phase 1 and
Phase 2 TDMA: TIA-102.CAAB" and I know of this project which has been
working on using it for TDD (with the ADF4351, too) [1]. The switching
time is going to depend on how quickly we can program the SPI registers
(upto 5MHz clock); but sadly the datasheet is light on details about how
much time it takes for each configuration change to take effect, so I don't
have hard numbers yet.
[1] http://www.skagmo.com/page.php?p=projects/21_superhettrx
On Sun, Apr 20, 2014 at 7:47 PM, Bruce Perens <[email protected]> wrote:
>
>
>
> On April 20, 2014 7:18:07 PM PDT, David Rowe <[email protected]> wrote:
>
> >Bruce - I don't think TDMA will require PLL locking, tx and rx would be
> all on one frequency.
>
> Not sure this is always the case for Whitebox. And we are looking at
> low-phase-noise DDS chips, and they still have a VCO. If you know of a
> really good NCO chip without one we'd like to know.
>
> Thanks
>
> Bruce
>
> --
> Sent from my Android device with K-9 Mail. Please excuse my brevity.
>
>
> ------------------------------------------------------------------------------
> Start Your Social Network Today - Download eXo Platform
> Build your Enterprise Intranet with eXo Platform Software
> Java Based Open Source Intranet - Social, Extensible, Cloud Ready
> Get Started Now And Turn Your Intranet Into A Collaboration Platform
> http://p.sf.net/sfu/ExoPlatform
> _______________________________________________
> Freetel-codec2 mailing list
> [email protected]
> https://lists.sourceforge.net/lists/listinfo/freetel-codec2
>
------------------------------------------------------------------------------
Start Your Social Network Today - Download eXo Platform
Build your Enterprise Intranet with eXo Platform Software
Java Based Open Source Intranet - Social, Extensible, Cloud Ready
Get Started Now And Turn Your Intranet Into A Collaboration Platform
http://p.sf.net/sfu/ExoPlatform
_______________________________________________
Freetel-codec2 mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/freetel-codec2
