[Yaesu] 856D on Digital modes?

[Dr. Gerald N. Johnson]

Looks to me like the different modes offered, PSK U and L, RTTY U and L, 
and USER U and L allow setting different gains and offsets besides the 
obvious sidebands. Modern software with more modes, I suspect is more 
tolerant of sideband, though I usually run USB for RTTY and PSK and let 
the software take care of any needed inversions. PSK modes work on the 
change of phase, not the absolute phase so the sideband doesn't affect 
operation. It may in other modes. Likely some software will work better 
with the lowest audio frequency set for 1000 kHz than for 200 kHz, hence 
the availability of setting the offsets.

In PSK and some other modes you have to keep the drive down to minimize 
intermod, which is monitored by PSK receiving software and if you drive 
too hard your signal will show up as being exessively broad and users 
will chomp on you for driving the rig too hard. RTTY doesn't do that so 
you can drive the transmitter harder for RTTY, until you run up against 
thermal limits of the PA. Many AFSK computer modes use their own 
internal selectivity so you can see half a dozen signals in the SSB 
filter passband yet the software happily copies just the one you want 
copied.

Receiver selectivity is set independent of the digital modes, so the 
modes can be as wide as the SSB filter or in really bad QRM if the mode 
will pass through the CW filter you can tune to use the CW filter. The 
waterfall display most use will clearly show the filter bandwidth.

I say go to digital mode USER-H, hook up the computer with the line leve 
ints and outs, no need for a rig blaster, and get on the air.

73, Jerry, K0CQ

On 2/22/2013 12:08 PM, David VE3VID wrote:
> Hi everybody,I have a question about using an FT857D on digital modes.  The rig has a "digital-mode" selection for AFSK sound card modes.  Some of the selections are PSK and RTTY.
> Can I work wider digital modes such as OLIVIA or HELL with the same 857-rig settings set in the PSK preselect?
> Any advice would be helpful, thanksDavid
>
>
>      VE3VID
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