On 4 Dec 2006 22:20:34 -0800, "
wrote:

Long live four wire resistance measurements!

Hi Dan,

A Cigar to the man who knows how to parlay Radio Shack into a winner!

73's
Richard Clark, KB7QHC

In my usual habit I'll reply off the bottom of the que... Lots of good
comments and suggestions...
In no particular order:
I suspect the surface of the black tire had cooled below ambient by
convective radiation... Happens to my windshield on mornings above
freezing ambient whilst the windshield will be a skim of ice...
Though the thought of what the tire might read under non-convective
conditions occurred and was duly filed away in that great container in
my head for further inspection... Actually I use the Rubble Method for
filing information.. That is everything in my head is tossed on a
great heap of rubble, and as I stir through the pile looking for one
item, interesting bits of flotsam and jetsam flow back to the top of
the heap for inspection, "oooh ya, I remember that!"

Yes, the thought that there might be unwanted resistance in the
connections to the condenser plates occurred and remains to be
investigated... The connecting wire is the #10 magnet wire forming the
coil and is firmly bolted with #8 brass hardware and flat washers to a
1"x1" tab formed on the edge of the plate when I cut the plates from a
sheet...

For Yuri, congratulations on the CQ160 win(s), nice job my friend...
Drop me a description of his antenna setup... Wanna be's like me are
always looking for an edge...
On the IR gun, it was in the ~$65 range on sale, as their economy
model, I don't remember who the internet vendor is, I can get you the
make and model if you need it... But just do a search, lots of sources
and prices... The little bit I have used it I have been satisfied with
the readings - nothing rings my 'no-way, Jose!' meter, so far... The
35' long radiant tube heater in my shop shows ~375-385 F at the mid
point from 8 feet away, which is about right as it will not ignite
paper on contact I tried though it makes it brown - paper has an
ignition temp of ~454 F per Ray Bradbury at least... The gun has a
laser spot so you can see where the detector is aimed and the size of
the spot is proportional to the area being measured at that distance...

I suspect that dielectric loss in the soda glass is the prime
contributor to the temperature rise on the plates... There is a
significant amount of joules passing through the glass as strain in the
dielectric..

Oh yeah, the question on the type of glass... Bad habits as an old lab
rat surfaced when I wrote that... Common window glass is float formed
on molten tin, and that is what my old chemical stained brain popped
out as 'stannous'...

On differential IR readings from the surface of various materials -
well I can't say for sure as my credentials in thermodynamics are shaky
at best (picture me shuddering in pain at the memories of Schrodinger
equations and those IBM punch cards we used to program the computer in
the physics lab 40 years ago - 'the horror, the horror'..... But, all
the materials in the tuner were within a few tenths when at ambient, so
I have no reason to suspect a gotcha when midly warmed...

denny / k8do - often confused but never in doubt...

Brain fart - substitute "radiation cooling" for 'convective cooling' in
my last post..
The thought struck me as I was wandering down the hallway that I had a
senior moment when I used the term convective for cooling to the sky by
radiation, duh...

denny - hey, even Einstein had his moments see Cosmological Constant

Denny wrote:
Brain fart - substitute "radiation cooling" for 'convective cooling' in
my last post..
The thought struck me as I was wandering down the hallway that I had a
senior moment when I used the term convective for cooling to the sky by
radiation, duh...

denny - hey, even Einstein had his moments see Cosmological Constant


Denny:

Maybe try a peltier junction next? grin

Regards,
JS

K8DO wrote:

For Yuri, congratulations on the CQ160 win(s), nice job my friend...
Drop me a description of his antenna setup... Wanna be's like me are
always looking for an edge...
On the IR gun, it was in the ~$65 range on sale, as their economy
model, I don't remember who the internet vendor is, I can get you the
make and model if you need it... But just do a search, lots of sources
and prices... The little bit I have used it I have been satisfied with
the readings - nothing rings my 'no-way, Jose!' meter, so far...

Any info on the IR gun would be appreciated, sounds, like right one for what
I want to use it (check the loading coils etc.)

Thanks! Wal's station rocks, even with this rusty OF. I put some pictures on
our Tesla web site www.TeslaRadio.org, click on PHOTOS and W8LRL. It will be
our goal to beat it from N2EE. We just came back from some slave labor of
love, clearing more brush in freezing windy WX, leveling the field for RF
:-) Waitng for the swamp to freeze so we can walk around and fix the
antennas.

73 Yuri, K3BU

He has quite a receiving system... makes my active array look puny..
I did not get out to the radio station yesterday... I will today and
will TRY to remember to make note of the IR Gun for you.. I am
satisfied with it...

ORION problems !?! I hope not... I have a brand new one as the #1
radio... It seemed to work well in CQWW CW.. As a SO SB 80M LP entry I
worked 69 countries, a new high for me from the RF hole of Michigan...
The score will not be impressive as I made zero effort to run stations,
instead cruised the band for multipliers as a test of my new antenna
arrays for 80M this year...
Last nite I kept waking up thinking about 160 antennas and I can feel a
new plan coming together in the hidden recesses of my twisted mind...
Why oh why, can't my brain do this in June? Gawd I hate climbing
towers in blowing snow and 20 degrees...

denny / k8do

Yuri Blanarovich wrote:
K8DO wrote:

For Yuri, congratulations on the CQ160 win(s), nice job my friend...
Drop me a description of his antenna setup... Wanna be's like me are
always looking for an edge...

... paper has an ignition temp of ~454 F per Ray Bradbury at least....

Actually, the name of his book is/was "451 Fahrenheit", not 454,
but you were close!

--
--Myron A. Calhoun.
Five boxes preserve our freedoms: soap, ballot, witness, jury, and cartridge
NRA Life Member and Rifle, Pistol, & Home Firearm Safety Certified Instructor
Certified Instructor for the Kansas Concealed-Carry Handgun license