[Premium-Rx] My assistant and heat sink thoughts

[John Perlick]

oh, be carefull with bucking transformers, guys!  Running a power supply at
a lower voltage can actully increase it's power dissipation!  It depends on
the type of power supply, but in the case of switchers, low line can be the
worst case.

John Perlick
----- Original Message -----
From: "Paul Wende" <pwende at arrow.com>
To: "'Premium-Rx (E-mail)'" <premium-rx at ml.skirrow.org>
Sent: Wednesday, April 16, 2003 11:26 AM
Subject: RE: [Premium-Rx] My assistant and heat sink thoughts


> Well, speaking of spectrum analyzer. Here is Michael giving my IFR1500 a
> workout.
>
> http://www3.telus.net/ve7khz/Dscn5155.jpg
>
> Just had a reply from Craig re: the power supply issue I mentioned and he
> reminded me of an old trick that I have used in some of my Collins 51J
> series of radios in the past. A bucking xfmr. Well, that's what happens
when
> the brain gets full. Some of the simple things get shoved out the left ear
> onto the floor and forgotten.
>
> I will find a little xfmr to fit inside the radio try knocking the voltage
> down to 100 or so. Will certainly be easier than a new supply and simpler
> than liquid Nitrogen. :-)
>
> I also thought that perhaps spraying water based paint or similar
material,
> through the holes in the lid above the heatsink, (wash off the lid right
> away) and drilling out the marked holes in the heatsink might be a simple
> way to improve air flow through the radio. That solid slug of aluminum is
> quite ineffective as a sink, containing the heat and restricting air flow
> and thus heat dissipation.
>
> Kind regards,
>
> Paul
>
> >-----Original Message-----
> >From: premium-rx-bounces at ml.skirrow.org
> >[mailto:premium-rx-bounces at ml.skirrow.org]On Beh
> >Sent: April 16, 2003 9:05 AM
> >To: 'pwende at arrow.com'; 'Premium-Rx (E-mail)'
> >Subject: RE: [Premium-Rx] My assistant
> >
> >
> >Paul,
> >Nothing beats a little helper in the shack. Just make sure he
> >learns the
> >soldering iron is a hot thing. I had my son put his lips
> >across a 9 volt
> >battery to understand tricity. My guy
> >likes the spectrum analyzer the best.
> >Last night he mentioned the base line looked like grass. My
> >response was,
> >that's correct it is called grass.
> >Then you need to have somebody sell all your toys when you get
> >too old to
> >lug them to the flea markets.   fc
>
>
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