> What is the TX IMD on this amp, when running full bore at
> 1200 w pep out ?? I suspect it won't be good. The
> ALS-600 is only -25db
The ALS-1300 is effectively two ALS-600 amplifier boards in
parallel with splitter/combiner on the input/output. There
are some minor changes in bias and control but they should
not effect operation/performance.
> I wonder if this new ALS-1300.. or any of the existing KW
> output SS amps have the same reduction in eff... when
> power reduced.
That's inherent in a fixed tuned (e.g. "broadband") design.
The voltage remains the same while the current changes so
the input/output impedances become significantly higher
than the design point. Try tuning your tube amplifier
for 1500 Watts into a dummy load then reduce the drive by
75% without retuning and calculate efficiency ... you will
see a similar decrease in efficiency.
73,
... Joe, W4TV
> -----Original Message-----
> From: amps-bounces@contesting.com
> [mailto:amps-bounces@contesting.com] On Behalf Of Jim Thomson
> Sent: Wednesday, December 30, 2009 6:19 AM
> To: amps@contesting.com
> Subject: [Amps] ALS-1300... IMD ??
>
>
> Gents
>
> I understand the new ALS-1300 uses 8 x finals. Are
> these MRF-150's ?? At 1200 w pep out... that's 150 w
> pep out per device. That's a bunch.
>
> What is the TX IMD on this amp, when running full bore at
> 1200 w pep out ?? I suspect it won't be good. The
> ALS-600 is only -25db
>
>
> On a similar note, I noticed that the eff on my 1000-MK
> -v is aprx 50%... at 200 w out. With power reduced
> to 100 w...... eff is down to 36%
>
> At 50w, it's worse still.
>
> I'm not impressed with the SS finals so far.... eff wise.
>
> I wonder if this new ALS-1300.. or any of the existing KW
> output SS amps have the same reduction in eff... when
> power reduced.
>
> Tnx......... Jim VE7RF
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