[AMRadio] Power Levels

[Steve Cloutier, 978-597-3311]

Thanks for the info... My understanding of the BC610 and the 250 TH is that 
at 2000 V. you should run about 250 mA.  This would be 500 watts DC 
input.  If your final is operating more or less properly, you might get 350 
watts or so output from the final - NOT including tank circuit losses.  My 
suspision is, IF you are running 2000 V at 250 mA, you MIGHT be getting 300 
watts out to the feedline.  You then need to deduct your feedline losses, 
antenna tuner losses, etc...

Bottom line is, I guess - is that you shouldn't have to reduce the power 
input to a BC610 at all to stay legal.  The rig already IS legal, unless it 
is being run very incorrectly and at a power level it is not designed to 
handle, and if it is, you won't be able to modulate it correctly anyway, so 
the point will be moot.

Measuring power output with great accuracy is almost impossible without 
pretty sophisticated instruments.  The whole FCC decision to measure output 
- and PEP output at that - even harder to measure correctly - was pretty 
foolish in the first place.

Oh well!

Regards,

Steve WA1QIX


At 07:57 PM 6/23/2002 -0400, you wrote:
>Steve,
>
>     I have a Heathkit HV Probe.  It isn't the most wonderful thing on the
>earth, but I read right about 2KV to 2.2KV using the Mark I Eyeball.
>There is some debate as to the Plate Current.  It reads about 100ma,
>so it CAN'T possibly be correct.  I have to get another meter, try and
>test the installed one, or another solution of sorts.
>
>[Now it is PROPERLY answered!]
>
>Bob - N0DGN
>
>----- Original Message ----- From: "Steve Cloutier
>
>
> > That's good power (500w)!  Hey, what is the DC power input to the RF final
> > stage?
> >
> > Regards,
> >
> > Steve
> >
> > >Steve,
> > >
> > >     I've measured the output with at least three different RF power
>meters
> > >including a Bird 43.  My carrier on 40m using full line voltage has
>always
> > >shown 500W or better.  That is one of the two reasons for adding the BIG
> > >variac.  I don't EVEN want to go into what the PEP output can hit with
>that
> > >carrier.
> > >
> > >Bob - N0DGN
> >
> >
> >
> >
> >
> >
> > >----- Original Message From: "Steve Cloutier
> > >
> > > > Hmmmmmmmmmmm... I bet it doesn't!  The BC-610 is a pretty inefficient
> > > > transmitter - I bet not much better than 60% - MAYBE - DC input to
>carrier
> > > > output.  Does your BC610 run 600 watts input?  Maybe it does... the
>ones
> > > > I've seen don't run that much power :-)
> > > >
> > > > Regards, and hope to hear that 610 on the air.
> > > >
> > > > Steve, WA1QIX
> > > >
> > >
> > >
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