Speaking of I2R losses
 

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

Speaking of I2R losses
 

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

Speaking of I2R losses
 

... 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

Speaking of I2R losses
 

"Denny" wrote in message
ups.com...

Well, there are dielectrics and there are . . . ummm well you get the
point...

In this case the main dielectric of my condensers is glass, probably
stannous float bath soda glass... 0.100" thick with an aluminum plate
on each side... After my fingers had found the disparate temperature
rise on an early test I did a literature search for the dielectric
constant and loss factor of glass and discovered that not all glass is
equal - or as Orwell put it, some of the animals are more equal than
the others...

Anyway, Soda glass has a loss tangent of 0.01 to 0.05 and a dielectric
constant of 6 - and Borosilicate glass (Pyrex) has a loss tangent of
0.001 to 0.002 and a dielectric constant of 4... So, it would appear
that Borosilicate glass is better as a low loss dielectric... The
trade off is that with 1/3 lower Dielectric Constant I would have to
increase my plate areas by 1/3 to maintain the same capacity... The
jury is out on this... 3.5 mc is relatively low frequency... I am not
sure how much of the heating is due to the loss factor of the glass and
how much is I2R heating from the current flowing across the plates...
I spoze I could order some custom made 8" X 10" X 0.100" Pyrex plates
and compare otherwise identical condensers... OTOH, I spoze some of
the more equal animals in my house would complain over sticks and
stones in their xmas stockings after I pay for the Pyrex...

denny / k8do

Could you use some Pyrex disk, I think I have some that are about a foot in
diameter. If I can find them they are yours for the postage.

Speaking of I2R losses
 

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...