[Elecraft] 10 MHz external reference - GPSDO

[Bill Frantz]

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, Gary at ka1j.com (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.

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