Jerry did answer the question very well but let's try another approach.
Using a 100 watt max power rig as our base, no SWR foldback, no circuit breaker
tripping,
the rig can produce a max of 100 watts to a 50 load. That is 70.7 volts of RF
to the 50 ohms.
That's (70.7 X 70.7) / 50 or 500/50 or 100 watts. On CW that's fine but what
about AM? On
AM we must reduce the carrier to 1/2 voltage or 35.35 volts. Using
P=E(squared) divided by
R, that is 35.35 X35.35 = 1,250. 1,250 divided by 50 ohms = 25 watts. So the
carrier power
is as Jerry stated, 25% of the max power available. On AM modulation, the
carrier voltage
swings from the 35.35 volts with no modulation to 0 to 70.7 volts under full
modulation.
Hence, the instantaneous power varies from 0 watts to 100 watts under
modulation. I have
noted some of the import rigs rate AM carrier at 40 watts out. Don't know how
they do that
without creating clipping under full modulation. I guess maybe they do not
allow 100%
modulation. Anyone know for sure?
73,
-Lee-
WA3FIY
On 30 Sep 2007 at 16:59, john ferro wrote:
>
> actually you have not helped me out - you still have not answered the
> question - whats the difference between an am carrier and cw carrier? if it's
> the same as some people say why on a japanese radio the am carrier is only 25
> to 50 watts (depending on the radio) when the mic is keyed vs. 100 watts on
> the same jap radio cw mode keyed down - all assuming swr is 1? i understand
> the swr fold back issue.> From: OTAKEBI@aol.com> Date: Sun, 30 Sep 2007
> 16:39:52 -0400> To: tentec@contesting.com> Subject: Re: [TenTec] ten tecs
> have 100 watts out on carrier??> > Yes, Mike.> Now we know what was going on
> once he explained it a little better.> I had a TS 180s that at had to see a
> perfect, flat, SWR to put out full > output.> Like Ten Tecs better.> Glad we
> were able to help him.> Dan/N4VET> > > >
> ************************************** See what's new at http://www.aol.com>
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