[Moon-net] Radio Drift problems

[Lance Collister]

Dave Anderson, K4SV wrote:
> Hi All,
>  
> Since I am new to EME JT65B  I have a question.  In trying to work some stations, can not decode,  I have noticed frequency shift of the center frequency. I tried one station for 40 minutes trying to decode.  As the data is sent the modulation extends higher in frequency and usually the center frequency is stable and lays in a straight line down the waterfall display.  On only a few stations have I noticed this drift.  It varies with successive transmissions.  It looks like a J or L and sometimes a S but each time my WSJT JT65B decoder can not decode this drifting signal.
>  
> I have a few questions
>  
> Can I do something to compensate for this drift on my end enabling an option or something?
>  
> Is this drift indicative of some transmitters?
>  
> Is this FSK of the FSK atmospheric?
>  
> Thanks in advance,
>  
> Dave Anderson, K4SV
> Tryon, NC
> 828 777-5088
>  
> www.K4SV.com
>
> _______________________________________________
> Moon-Net posting and subscription instructions are at http://www.nlsa.com/nets/moon-net-help.html
>
>
>   
Hi Dave,

No - that is a problem indicative with many 2m rigs.  You can try to 
check the little AFC box on the JT65B screen and sometimes that will 
help.  That is the reason I make sure both my XMTR and RCVR are well 
warmed up for several hours before I run any JT65 skeds.

On 6m, there is much less of this frequency instability, which permits 
the slightly more sensitive JT65A mode to be used.  GL and VY 73, Lance

-- 
Lance Collister, W7GJ (ex: WN3GPL, WA3GPL, WA1JXN, WA1JXN/C6A, ZF2OC/ZF8)
P.O. Box 73
Frenchtown, MT  59834  USA
QTH: DN27UB
TEL: (406) 626-5728
URL: http://www.bigskyspaces.com/w7gj
2m DXCC #11/6m DXCC #815