A handy tool for checking amp component temperature is an infra-red
thermometer. These are available from a variety of sources. I got one from
sears that goes up to 1400f and also includes a thermocouple for air
temperature or other contact reading(NOT in contact with HV or other
energized components though!!). Two big deciding factors are the diameter
of the spot it reads, smaller is better for amp use I think, and the
temperature range... having a laser spot for aiming is nice also.
David Robbins K1TTT
e-mail: mailto:k1ttt@arrl.net
web: http://www.k1ttt.net
AR-Cluster node: 145.69MHz or telnet://dxc.k1ttt.net
> -----Original Message-----
> From: Carl [mailto:km1h@jeremy.mv.com]
> Sent: Sunday, December 07, 2008 18:30
> To: OZ1AXG Flam; amps@contesting.com
> Subject: Re: [Amps] Plate choke resonanse and safe operation
>
> I agree that a GDO is only an approximation. Try running the amp at 500W
> to start at 28.0 mHz and then feel the choke for excessive heat. Go up
> in 250W steps and check each time.
>
> Of course be sure all safety rules are followed!
>
> Carl
> KM1H
>
>
>
> ----- Original Message -----
> From: "OZ1AXG Flam" <oz1axg.nospam@dxmail.dk>
> To: "Carl" <km1h@jeremy.mv.com>; <amps@contesting.com>
> Sent: Sunday, December 07, 2008 6:06 AM
> Subject: Re: [Amps] Plate choke resonanse and safe operation
>
>
> > the RFC is Installed
> >
> > I will try to measure the resonans again. For 27 MHZ i did the
> > measurement 3 times. A grid dip meter is not the most accurate
> > instrument, so i will try it again. but how close is "safe" ? what
> > would the symptoms be at tuneup if resonans is close by ?
> >
> > Then old RFC fried (broke a wire) when i accendential tranmitted 125
> > watt (1/2 second) in the amplifier. Had forgotten to reduce the drive
> > before tuning :=( This has happened before on other band - but this
> > was a first for 30 meters ...
> >
> > OZ1AXG Flam
> >
> > ----- Original Message -----
> > From: "Carl" <km1h@jeremy.mv.com>
> >
> >
> >> Is that installed or on the bench? That first one is too close for
> >> comfort for 10M CW.
> >
> >
> >
> >
>
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