On Sat, 3 Jan 2004 00:20:14 -0800 R.Measures <r@somis.org> writes:
Hi Craig & Rich,
> >I have not read or seen data on the ALC overshoot problems. The
> ARRL reviews seem to politely ignore the issue.
>
> ** I see c. 20% overshoot on my TS-440S on the first syllable.
> Running almost no ALC helps.
Same radio here; same problem.
NEVER running into "factory" ALC helps more. :-)
> >My main interest in this area is
> >too emit the cleanest possible signal. Its becoming a uphill battle to
find
> >a new model radio with a clean transmitter without ALC, key clicks
and bad
> >IMD problems.
>
> ** Without some form of ALC, excess IMD is a virtual guarantee --
Not necessarily. Just use some form of hard limiting before the
"box". I run a RF clipper with 20 dB of headroom.
A great (fast) audio limiter (i.e. an ancient Spectrasonics 610) is
also a possibility.
With the mike level under control, one can set the power level just
like a real radio station and never experience any ALC action; nor
clipping.
73 & Happy New Year,
Marv WC6W
*
________________________________________________________________
The best thing to hit the internet in years - Juno SpeedBand!
Surf the web up to FIVE TIMES FASTER!
Only $14.95/ month - visit www.juno.com to sign up today!
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|