[NLRS] 432amp

[Dave Aho]

My thumbs don't believe in rules..*LOL*  I didn't say
a whole lot more, but in the instances that I have
observed with various solid state amps over the years,
one does get a bit of a gain in power by going SSB
over FM...even with solid state.  I think one of the
reasons they listed it with a rating in FM power is
that it has a constant carrier instead of a SSB signal
voice peak, thus is easier to read at a glance and
more consistant in power readings.  One can set
carrier power on input at the specified range and get
the quoted output, but when running SSB, the modulated
power input does fluctuate above and beyond the carrer
set power, thus giving, in essence, more drive and
causing the output to jump up also.  Again, I have no
idea on how well this brand works for UHF, but the VHF
amps have seemingly been used with good results.  I am
basing these on practical observed results over the
years...and as I have said I personally would steer
toward the mirage/TE systems brand amps, but it may be
worth it to look at this KLV amp.

      Dave...N9TTX


--- "Dr. Gerald N. Johnson, electrical engineer"
<geraldj@isunet.net> wrote:
> As a rule of thumb, a solid state amplifier will not
> produce a greater
> peak power on SSB than on FM or CW. Not even with a
> great deal of
> distortion. The tube linear often did because of
> poor long term power
> supply regulation that the short peaks of SSB could
> get out before the
> power supply drooped and also because of the long
> thermal time constant
> of the tube, especially sweep tubes with large peak
> plate current
> capabilities allowed larger peaks than key down CW.
> And to run those
> tubes at those conditions one didn't want to say
> "AHHHH" too long or the
> glowing plate might melt the glass. That's not to
> say that the tube
> driven that hard is still truly linear.
> 
> On the other hand a solid state amplifier is
> generally limited by a
> regulated power supply and by peak collector
> current. Linearity as it
> approaches saturation power (the FM rating) is often
> poor. We used to
> get 3rd order intermod values in the -30 dB range,
> sometimes nearly -40
> with 5th order generally 45 or 50 dB down. Now the
> latest super duper
> rice boxes have 3rd order intermod only 25 dB down,
> with 5 th order only
> 35 dB down and higher order intermod showing well
> above the spectrum
> analyzer threshold. This leads to polluted ham bands
> with splatter from
> end to end and beyond.
> 
> UHF amplifiers are often more expensive than VHF
> amplifiers because they
> need more stages to get the same power gain.
> 
> 73, Jerry, K0CQ
> 
> -- 
> Entire content copyright Dr. Gerald N. Johnson,
> electrical engineer.
> Reproduction by permission only.


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