[Amps] Why hasn't solid state replaced tubes?

[Radio WC6W]

On Tue, 04 Mar 2003 07:32:09 -0500 Zyg Skrobanski <af4mp at mindspring.com>
writes:
> >IMD (splatter) is not considered spurious emissions by ICOM. All 
> that tells
> >you is harmonic suppression.
> 
> Is the IMD normally measured by using a two-tone test?  If so, does 
> the
> particular frequency of the tones (within a normal audio 3KHz 
> bandwidth)
> change the IMD, i.e. which two tones would give the worst case 
> reading?
> --
> Zyg AF4MP
> Roswell GA USA

Hi Zyg,
   Yes.

   400 & 1800 Hz are used for the FCC (US) tests.

   If moving those frequencies a little changed the IMD, I would suspect
the SSB generating stages rather than the amplifier.

   A pair of CW signals run through a power combiner is a better source
for testing power amps than any amateur exciter.   Even if an exciter has
reallllly good IMD it may add to the IMD of the amplifier under test in a
non-linear fashion making it hard to discern the true figures for the
amplifier being tested.

73 & Good morning,
   Marv  WC6W









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