Re: [amsat-bb] In-band Doppler correction

["Al Lawler (laptop)" <al.lawler@xxxxxxxxxx>]

  Also, at least on the FT736r, which 
uses a similar controller,  repeater
offset changes were ignored while the rig
was keyed...   For packet use, this is 
seldom a problem,  but for ragchewers,
it was more so.  I don't remember what
the minimum offset increment was...)

  The best workaround I had found was
to send the command several times (in
hopes that the mic would be unkeyed at least
once), and/or software key the rig, so
that the program knows when it can
change frequencies safely.

  The good news is that FM offsets 
and rx frequencies have to be set explitly,  
so if one offset is missed,  the next one 
should put you back on frequency 
(unlike a mic-click scheme, where a few 
missed clicks can put you permanently 
behind the 8 ball...)

  -al

Wayne Estes W9AE wrote:
> 
> Anthony Monteiro wrote:
> 
> I recall working on this on the FT-847 using the repeater offset to
> control it and I ran into some strange problem (the radio ignores
> the CAT commands sometimes???) so it will not work on an FT-847.
> 
> Wayne replies:
> 
> The problem with the FT-847 is that the CAT interface only allows the repeater offset to be programmed in large increments (10 kHz, I think).   Far too coarse for Doppler tuning.  I learned this while testing DK1TB's attempt to get ISS Doppler tuning to work on my FT-847.
> 
> Wayne Estes
> Mundelein, IL, USA
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