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ZL3AI > APRDIG 02.04.03 14:37l 251 Lines 9077 Bytes #999 (0) @ WW
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Subj: TAPR Digest, Mar 24, 3/4
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From: ZL3AI@ZL3VML.#80.NZL.OC
To : APRDIG@WW
Subject: RE: Radiation monitoring and APRS
From: "Mark Fellhauer" <sparkfel@qwest.net>
Date: Mon, 24 Mar 2003 14:05:34 -0600
X-Message-Number: 19
At 01:17 PM 3/24/2003, Miller Scott Contr 30SCS/FTI wrote:
>Equipment for monitoring atmospheric contamination isn't cheap, though. I
>built my computerized Geiger counter for under $50.
I seem to recall that Radio Shack used to make a geiger counter that looked
like a smoke detector. That was back right after the Three Mile Island
Days... :)
I suppose anyone living near Davis Besse would probably want one of those now.
Many years back I was afilliated with Burge Instrument. They make portable
ground water monitoring equipment. They were looking for a way to do
real-time RF reporting of TCE blooms in groundwater from multiple well
points in an APRS like environment. TCE was then reduced by the "Burge
Purge."
http://www.burgenv.com/system.htm
73,
Mark
KC7BXS
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Subject: Re: CWxxxx named WX stations
From: John Mc Hugh <johnk.mchugh@worldnet.att.net>
Date: Mon, 24 Mar 2003 17:17:27 -0500
X-Message-Number: 20
Hi,
I was out of town last week when all this CWxxxxx discussion showed up. For
those that care to be informed please go to our web page (see below) and
lookup the CWOP section. This program was developed by hams as a public
service to those tracking hurricanes, forest fires, tornadoes etc. It has
NOTHING to do with CBers
John
--
John Mc Hugh, KU4GY
Coordinator for Amateur Radio
National Hurricane Center, W4EHW
Home page:- http://www.fiu.edu/orgs/w4ehw
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Subject: Re: Radio Shack WX Station & APRS?
From: "Jacob Tennant" <k8jwt@ntelos.net>
Date: Mon, 24 Mar 2003 17:27:23 -0500
X-Message-Number: 21
Let me clarify my question...
I was wondering about using the Radio Shack WX station with only a
TNC/PIC-Based device to send out WX data.
My idea was to install this at my sisters house (better location) using as
little power as possible and making it as compact as possible.
Jacob Tennant K8JWT
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Subject: Re: Radio Shack WX Station & APRS?
From: "Mike Yetsko" <myetsko@insydesw.com>
Date: Mon, 24 Mar 2003 18:11:07 -0500
X-Message-Number: 22
>My idea was to install this at my sisters house (better location) using as
>little power as possible and making it as compact as possible.
>
>Jacob Tennant K8JWT
Actually... I wonder if anyone has considered a PIC based 'minimal'
wx interface station? Like the T238 but PIC based, no display,
STRICTLY for interfacing to a radio...
Mike
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Subject: Re: Radio Shack WX Station & APRS?
From: "Daron J. Wilson" <daron@wilson.org>
Date: Mon, 24 Mar 2003 15:26:46 -0800
X-Message-Number: 23
>Actually... I wonder if anyone has considered a PIC based 'minimal'
>wx interface station? Like the T238 but PIC based, no display,
>STRICTLY for interfacing to a radio...
Excellent point. The T238 is out of stock as I understand it, I have an
immediate need to put a weather station on our digi, but I've seen too
many of the Peet Bros sensors go flying by when the wind reaches
extremes, and our site dictates a more substantial sending unit like the
one-wire.
Perhaps most of the work is done, being as the T238 did just what we
needed, maybe the code can be reduced to conversion and not bother with
the display, or possibly even a few LED's to indicate sensor status for
easy testing, and made available. I'd take a couple.
73's N7HQR
Daron J. Wilson, RCDD
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Subject: Re: Radio Shack WX Station & APRS?
From: "Ramon F. Kolb" <ramon@ieee.org>
Date: Mon, 24 Mar 2003 18:30:45 -0500
X-Message-Number: 24
You may want to look into WXTRAK. Its website
(http://www.byonics.com/wxtrak/) says:
"WXTrak is the upcoming device that interfaces a weather station to a
radio transmitter to broadcast weather data. It will be available as a
kit, or as an upgrade chip for a TinyTrak kit. The initial release will
support the Radio Shack WX200, the Oregon Scientific WM-918, and Peet
weather stations. Future version should add support for Davis and Dallas
1-wire stations. The WXTrak is currently being beta tested, and is
expected to be available in Feburary, 2003."
I'm not sure what the current status is, but an email to Byon
(byon@byonics.com) should resolve your question...
(I have no relation to the WXTRAK author, other than that I am a
TinyTrak user and subscribed to his mailing list for that subject)
--Ramon
Ramon F. Kolb, KX1T, PA3EUG, Boston, MA, USA [FN42KI]
ICQ:77117744; MSNMGR:legalalien30@hotmail.com
http://kx1t.webhop.org
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Subject: AX.25, HDLC, KISS, and bit stuffing
From: Miller Scott Contr 30SCS/FTI <Scott.Miller@vandenberg.af.mil>
Date: Mon, 24 Mar 2003 23:53:00 -0000
X-Message-Number: 25
Ok, I'm working on a tracker design using an HC08 that's going to be talking
to a KISS TNC. One thing that's not clear from the documentation is where
the bit stuffing gets done. The AX.25 spec says the sender should monitor
the bit sequence and insert a '0' after a run of five '1's to prevent the
flag from appearing in the frame contents. The KISS protocol says that
frames are passed directly to the HDLC layer and that AX.25 must be
implemented entirely on the host, which I take to mean that the device
talking to the KISS TNC is responsible for bit stuffing. But that doesn't
make much sense, since bit stuffing is a synchronous trick and the whole
point of KISS is to provide an asynchronous interface.
So I'm assuming that what really happens is that I just pass 8-bit async
data to the TNC using KISS, and when the TNC gets around to spitting it out
the modem port it takes care of the bit stuffing. Is that correct?
Thanks,
Scott, N1VG
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Subject: Re: Radio Shack WX Station & APRS?
From: "Spider" <spider@rivcom.net>
Date: Mon, 24 Mar 2003 16:59:03 -0700
X-Message-Number: 26
----- Original Message -----
From: "Jacob Tennant" <k8jwt@ntelos.net>
To: "TAPR APRS Special Interest Group" <aprssig@lists.tapr.org>
Sent: Monday, March 24, 2003 3:27 PM
Subject: [aprssig] Re: Radio Shack WX Station & APRS?
>Let me clarify my question...
>
>I was wondering about using the Radio Shack WX station with only a
>TNC/PIC-Based device to send out WX data.
>
>My idea was to install this at my sisters house (better location) using as
>little power as possible and making it as compact as possible.
>
>Jacob Tennant K8JWT
Byon's PIC project supports the radio shack/Oregon Scientific WM-918 type WX
stations.
Jim, WA6OFT
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Subject: Re: Radiation monitoring and APRS
From: Steve Jones <s.jones@rogers.com>
Date: Mon, 24 Mar 2003 19:00:09 -0500
X-Message-Number: 27
on 3/24/03 12:12 PM, Miller Scott Contr 30SCS/FTI at
Scott.Miller@vandenberg.af.mil wrote:
>-Different detectors have different levels of sensitivity to different
>types of radiation (alpha/beta/gamma/neutron). How do you communicate that?
>Should the report include information on the detector type?
I wouldn't worry about alpha or beta particles much. They both have a very
short range and are easily stopped (air stops alpha, plastic stops beta).
Of most concern would be gamma radiation if you're just measuring the
general background levels around your house.
>-What units to use? i.e., counts, Roentgens, Rads, Rems, Grays, Sieverts,
>and so on. Roentgens would make the most sense to me, since it's generally
>adirect conversion from counts/minute, and doesn't require a quality factor
>like Rems.
Isn't the Sievert an SI unit? Most radiation monitors setup to monitor a
general area output a counts per second (or minute) rate. You also need
someway to show what the general background is for the area you are
monitoring.
>-What time period? Counts from a GM tube are discrete events - it's not an
>analog value. What period of time should the measurement be averaged over?
I think most people working in the nuclear industry are more familiar with a
rate based value i.e. Cps, cpm, mrem/hour.
>My personal feeling is that for simplicity it could just be
>milliroentgens/hr, averaged since the last transmission. I've got an HC08
>microcontroller based Geiger counter ready to go that I might just go ahead
>and hook up to experiment with. It'd be kind of cool to watch changing
>radiation levels in real time over the whole country during solar flares and
>such.
I'd go for cpm with an indication of normal background levels somehow. The
background in your area might be higher then mine.
--
Steve <s.jones@rogers.com>
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