On Jul 9, 2008, at 6:41 PM, Leigh L. Klotz, Jr. wrote:
Is this to minimize a constant frequency shift between TX and RX....
It's to ensure *no* frequency shift between the two (just in -S mode),
which minimizes T/R delays because we don't have to switch crystal
filters.
AMTOR and related modes can also be used without engaging SYNC DATA,
assuming a suitable value of CONFIG:PLL RLS is set up. I'll expand on
this topic in an application note when I get a chance.
73,
Wayne
N6KR
wayne burdick wrote:
MCU 2.15 / DSP 1.84, 7-8-08
...
* SYNC DATA: Selecting sync data or “-S” now ensures that the
same crystal filter will be used for both RX and TX -- either 2.7
or 2.8 kHz.
(Sync data mode, enabled by assigning PF1 or PF2 to CONFIG:SYNC DT,
can be
used to minimize the error rate of AMTOR, PACTOR, ARQ, and similar
modes.)
While -S is in effect, the receive crystal filter cannot be changed
with
XFIL, and SHIFT/LOCUT/HICUT are unavailable. WIDTH can still be
changed,
but it will affect only the DSP IF, not the crystal filter. The RX
and TX first I.F.s will thus remain identical, a requirement for -S
operation.
---
http://www.elecraft.com
_______________________________________________
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com
