GPS? Antenna
It is amazing what is available for 10 - 20 dollars. Some of the LED
drivers have a dimming input on the low voltage side. Not sure of the
detailed implementation of a din temperature controller with 4-20 mA
output, but it might be as simple as tl431 shunt reference and a resistor
network to map 4-20 mA to the 1 - 10 VDC analog input of an LED driver
(there are a plethora available "Meanwell led driver" is one that comes to
mind).
On Tue, Sep 6, 2016 at 12:05 AM, jimlux jimlux@earthlink.net wrote:
On 9/5/16 8:52 PM, Scott Stobbe wrote:
The bargain price mini coolers are often peltier cooled, they appear to
fall under the marketing term "thermoelectric mini-fridge". I can't think
of a project name, but I'm sure I've seen this done before using a mini
fridge.
https://www.amazon.com/AGPtek%C2%AE-Digital-Temperature-Cont
roller-Alarm/dp/B005NGL5AK
Not used this particular one, but i have some that look quite similar, and
work well.
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Hi Rick:
I've used two types.
- Most of the replies have been for controlled air temperature devices. These are by far the most common but also they
take a long time to change temperature. - Hot/Cold plates are much faster since the DUT is in close contact with the plate. We used these with a PID
controller and liquid Nitrogen gas. Just toss a towel over the DUT and you have very fast cycle times.
I built a DIY version for heat only using a couple of flexible heater strips glued to aluminum blocks, a PID controller
and a 10k thermistor embedded in one of the blocks. The Steinhart-Hart thermistor equation is of the third order with
respect to R but it is linear with respect to the coefficients making it easy to fit.
http://www.prc68.com/I/Sensors.shtml#Temperature
The unit is hiding from me, maybe it's photo shy.
--
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
The lesser of evils is still evil.
-------- Original Message --------
As we all know, step #1 in making a clock is NOT
to build a thermometer :-)
I thought I would check the brain trust here to see
if anyone has seen a hobbyist grade temperature
testing chamber or kit or homebrew design. I
have some crystals, oscillators, and other
electronics I would like to characterize over
temperature. I know this reflector has discussed
homebrew stabilization ovens; however, they
have tended to have very long time constants
(which makes sense for that application). I
need to be able to change temperature in a
reasonable amount of time, and I don't need
extreme stability. Looking for any ideas,
maybe in the "maker" spirit. I think the
size I need would be perhaps 1/2 the size
of a shoebox.
BTW, in case someone has a chamber to sell,
let me know...
Rick Karlquist N6RK
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As far as the warm end of the temperature spectrum goes, I have used a
Crockpot without the crock and put a thermometer probe inside. when I
wanted it to stay at a specific temperature I threw a blanket over it and
shut it off. I suspect you could get it to hold temperature better by
simply controlling the voltage to it.
For the cold end perhaps, you could put the ceramic crock in the freezer
(roughly 0°F). It would warm slowly enough that you could perform testing
along the way.
On Mon, Sep 5, 2016 at 9:48 PM, Richard (Rick) Karlquist <
richard@karlquist.com> wrote:
As we all know, step #1 in making a clock is NOT
to build a thermometer :-)
I thought I would check the brain trust here to see
if anyone has seen a hobbyist grade temperature
testing chamber or kit or homebrew design. I
have some crystals, oscillators, and other
electronics I would like to characterize over
temperature. I know this reflector has discussed
homebrew stabilization ovens; however, they
have tended to have very long time constants
(which makes sense for that application). I
need to be able to change temperature in a
reasonable amount of time, and I don't need
extreme stability. Looking for any ideas,
maybe in the "maker" spirit. I think the
size I need would be perhaps 1/2 the size
of a shoebox.
BTW, in case someone has a chamber to sell,
let me know...
Rick Karlquist N6RK
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ailman/listinfo/time-nuts
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Thanks for all of the help.
I contacted Huber Suhner and now have the data sheet and radiation
patterns for this antenna.
73
Glenn
WB4UIV
On 9/6/2016 4:25 AM, Szeker K. wrote:
Yes its H-S model, and it must be a GPS antenna...
http://www.cafr.ebay.ca/itm/Ericsson-KRE-1012082-1-GPS-Antenna-26dBi-For-HUBER-SUHNER-84097323-/182012930579?hash=item2a60d0ea13:g:MAMAAOSwZd1Vdn6-
Regards
Karl
2016-09-06 5:12 GMT+02:00 Chris Waldrup kd4pbj@gmail.com:
It's a Huber Suhner.
Chris
On Sep 5, 2016, at 21:26, Glenn Little WB4UIV <
glennmaillist@bellsouth.net> wrote:
Pete,
I do not know if I can send a picture to the mailing list.
I am sending this to you and the list.
The antenna is 4 inches from tip of cone to bottom of type-N connector.
It is 2 5/8" in diameter.
Thanks
Glenn
On 9/5/2016 8:25 PM, Pete Lancashire wrote:
Nemko is the Norwegian "UL", my guess is the numbers are the
test/certification numbers. A picture would help
-pete
On Mon, Sep 5, 2016 at 5:14 PM, Glenn Little WB4UIV
<glennmaillist@bellsouth.net mailto:glennmaillist@bellsouth.net>
wrote:
At the last hamfest that I attended, I bought an antenna that looks
like a GPS antenna.
The price was right.
This is a Nemko Article number: 84097323, Type number 1315.17.0018.
It has a manufacturing date of 09/2012.
Can anyone tell me if this is in fact a GPS antenna and what voltage
wold be required.
I would suspect that it would be either 5VDC or 3.3 VDC based on the
date.
Any help appreciated.
Thanks
73
Glenn
WB4UIV
--
------------------------------------------------------------
Glenn Little ARRL Technical Specialist QCWA LM
28417
Amateur Callsign: WB4UIV wb4uiv@arrl.net
<mailto:wb4uiv@arrl.net> AMSAT LM 2178
QTH: Goose Creek, SC USA (EM92xx) USSVI LM NRA LM SBE ARRL TAPR
"It is not the class of license that the Amateur holds but the class
of the Amateur that holds the license"
------------------------------------------------------------
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--
Glenn Little ARRL Technical Specialist QCWA LM 28417
Amateur Callsign: WB4UIV wb4uiv@arrl.net AMSAT LM 2178
QTH: Goose Creek, SC USA (EM92xx) USSVI LM NRA LM SBE ARRL TAPR
"It is not the class of license that the Amateur holds but the class
of the Amateur that holds the license"
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