The XY RTTY tuning ovals are based on the mark and space signals
which are 170 Hz apart. I can easily tune RTTY signals with the
10 Hz tuning step in the K3, so 10 Hz stability on both the
transmitter and the receiver should be good enough for reliable operation.
With the low stability TCXO and no external reference, I get
good results with RTTY. I don't notice shifts in the ovals.
73 Bill AE6JV
On 3/14/16 at 12:10 AM, [email protected] (Gary Smith) wrote:
Something I have wondered since running MMTTY and looking at
the XY scope is, why do I see the XY ovals shifting clockwise
as the station is transmitting. I find decoding is best when
the ovals are as close to straight vertical & horizontal. If I
let them rotate, I lose the cypher so I have to actively adjust
VFO A to maintain their proper spacing.
-----------------------------------------------------------------------
Bill Frantz |The nice thing about standards| Periwinkle
(408)356-8506 |is there are so many to choose| 16345
Englewood Ave
www.pwpconsult.com |from. - Andrew Tanenbaum | Los Gatos,
CA 95032
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