Andrey Stoev wrote:
In the same
Physics 101 class they teach that black painted objects radiate heat
better - one reason why the anode of a tube and also heatsinks are black.
Sort of true, but is "blackness" at near infrared, for the valve, and
far infrared, for heat sinks (also near infrare
Folks:
At 22:05 06/27/2007, Fred (FL) wrote:
If anyone remembers their Physics 101 "Painted Tin
Can" experiment - one painted light, and one painted
dark - the K3 will naturally be an internally hot
rig, on field days. In Physics 101 class - the
can painted black - took on like 20% more interna
int the K3 once I get it in Grey. :-))
73
AE1Z
- Original Message -
From: "Fred (FL)" <[EMAIL PROTECTED]>
To:
Sent: Wednesday, June 27, 2007 11:05 PM
Subject: Re: [Elecraft] K2 Glitch on Field Day
If anyone remembers their Physics 101 "Painted Tin
Can" exp
If anyone remembers their Physics 101 "Painted Tin
Can" experiment - one painted light, and one painted
dark - the K3 will naturally be an internally hot
rig, on field days. In Physics 101 class - the
can painted black - took on like 20% more internal
heat, than did the can painted light. Heat
ref
Was the case exposed to sun heating during the operating period? A dark
case, or any non reflective painted case, can develop quite a bit of heat
from sun exposure even in mild weather. That coupled with high duty cycle
of FD might have triggered the hi temp condition.
Stuart
K5KVH
___
Easier than that - Work in :
Degrees
Metres
Litres
Euros
Way to go.
A young (62) G3SJJ. Chris Burbanks. Postal code NG12 5NX, D. O. B.
20-04-1945. Info freely given because I have no hangups about not
signing emails.
Ian Stirling wrote:
On Wednesday 27 June 2007 12:00:40 Don Wilhelm wr
On Wednesday 27 June 2007 12:00:40 Don Wilhelm wrote:
> There is also the conversion I use because I never can remember when and
> where to add or subtract 32 degrees without thinking about it.
The way I remember is that the freezing point of water
is zero degrees C and 32 degrees F - and conve
Larry, WR1B'; elecraft@mailman.qth.net
Subject: Re: [Elecraft] K2 Glitch on Field Day
There is also the conversion I use because I never can remember when and
where to add or subtract 32 degrees without thinking about it.
Both scales coincide at -40 degrees, so simply add 40 degrees to the
t
There is also the conversion I use because I never can remember when and
where to add or subtract 32 degrees without thinking about it.
Both scales coincide at -40 degrees, so simply add 40 degrees to the
temperature to start with, then multiply by 5/9 or 9/5 depending on
whether you are conve
Hi Larry:
I've gotten the "PA HOT" warning when my K2/100 was in the car and had
been left outside on a less-than 40-degree F night!
The problem, in my case, was that the firmware (unfortunately, I can't
recall the version number, but it was relatively new) wasn't able to
account for REALLY LOW
]
[mailto:[EMAIL PROTECTED] On Behalf Of Don Wilhelm
Subject: Re: [Elecraft] K2 Glitch on Field Day
... read the temperature (convert to deg. C if the reading is in deg. F) and
enter that value into the CAL tPA menu parameter.
___
Elecraft mailing list
Larry,
In the past, I have seen several reports of the erroneous PA HOT message
behavior - it seems to me that it typically happens during a portable
operating situation - perhaps caused by some mysterious power glitch or
something like that. I really don't know the reason behind this loss of
Larry,
Seems strange that this came up after your rig was sitting but I will
tell you about my experiences with a toasty PA
I have not ever seen the message PA Hot but I certainly have noticed the
PA getting hot and in a couple of instances cause the rig to shut
down/reboot. I opera
I've seen a couple of posts about folks having some interesting
"problems" with their K2s on Field Day. I also had an "event," and
wonder if anyone else has seen this problem before.
After operating most of Saturday afternoon, I turned off my K2/100
around 6 to break for supper. Since my wife had
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