Topband: 160M JT65HF

[Joe Subich, W4TV]

 > Why not allocate digital mode above 1900 KHz?

Because 1900 and up is not available in many areas of the world.
Although I'm not happy with TJ65 at 1838 - it's far better than
the over driven SSB, ESSB and AM that was the norm between 1830
and 1850 a few years ago (and still exists in some areas).

Of course 600 Watt JT65 is nothing more than an alligator ...
it causes a tremendous amount of QRM from all the stations calling
that the high power station can't hear.  When someone  on the East
Coast (or Caribbean) hear a west coast station they don't bother to
think that the west coast (or Pacific) station is running 10-12 dB
more power than "normal."

I don't think that anyone on 160 wants a JT65 "arms race" where 1500 W
outputs become normal.  Not only will the perception of interference to
other operations become worse, the very strong signals will cause AGC
issues that will make copying the weaker signals much more difficult
for everybody.

73,

    ... Joe, W4TV


On 12/31/2011 11:27 PM, n4is wrote:
> Happy New Year to all
>
> Jim, I'd love to have you as a neighbor. You know how to set up a station
> for best performance. I had experience with some stations in my area that
> wants to get long DX increasing power without knowing how to do it. I was
> able to hear the guy on several  different frequencies and plenty of phase
> noise.  Digital modes using AF can be very noisy if you don't know what you
> are doing.
> I have a DDR SDR and I can see the noise across the band on the water fall
> associated with the shift on the digital signal.
>
> Why not allocate digital mode above 1900 KHz?
>
> I know JT65, FSK441, etc. very well.  I was very active on MS on 2 and 6m
> when we transitioned from fast speed cw to JT modes 10 years ago. Also I did
> EME CW and some JT65 on 144 MHz.
>
> Regards
> Jose Carlos
> N4IS
>
>
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