[AMRadio] Side band power with increased carrier/was clipperton onAM

[Jim Wilhite]

Nice explanation of the test Gary.  Maybe this will clear up some of the 
confusion.  It is too bad that test equipment like spectrum analyzers 
are so expensive.  I have wanted one for a very long time, but just 
don't have the extra cash.

Everyone remember this description as you work toward maximum PEP. 
There are two flies in the ointment.  Your voice isn't like a 1000 cycle 
symmetrical tone and your antenna may not be 50 ohms resistive. 
Explaining these two variables will make it as muddy as water in the 
Mississippi at New Orleans.

Almost all of us must relay on meters.  If you expect any form of 
accuracy then the meters must be capable of .25 sec time response.  They 
also must be in good repair and when the book says that you will have 
.300 ma. for full power, that means that you meter will go only to .300 
ma on those infrequent excursions up to that point.  The meter will not 
be there very many times as you talk.

If you follow good engineering practice, as the FCC like to specify, 
then you signal will be clear and very understandable.

Jim/W5JO



----- Original Message ----- 


> Today I warmed up the HP141 spectrum analyzer and made some power
> measurements of my Kenwood TS-430 in the AM mode. The TS-430 was fed 
> into a
> 200 watt 30 db attenuator and another 20 db of attenuation was added 
> to feed
> the spectrum analyzer. Also used a scope to see when 100% modulation 
> was
> achieved. Also used the PEP wattmeter in the kenwood tuner. A function
> generator was used to generate a 1000 Hz tone for modulation.
>
>
> 73
> Gary  K4FMX