| |
ZL3AI > APRDIG 01.04.03 13:17l 130 Lines 4974 Bytes #999 (0) @ WW
BID : 1074-ZL3AI
Read: GUEST
Subj: TAPR Digest, Mar 24, 4/4
Path: DB0FHN<DB0ZWI<DB0HST<HB9OK<HA3PG<7M3TJZ<SP7MGD<VK7AX<ZL2BAU<ZL3VML
Sent: 030331/1923Z @:ZL3VML.#80.NZL.OC #:62956 [Chch-NZ] FBB7.00i $:1074-ZL3AI
From: ZL3AI@ZL3VML.#80.NZL.OC
To : APRDIG@WW
Subject: Re: Radiation monitoring and APRS
From: "Spider" <spider@rivcom.net>
Date: Mon, 24 Mar 2003 17:09:39 -0700
X-Message-Number: 28
----- Original Message -----
From: "Mike Yetsko" <myetsko@insydesw.com>
To: "TAPR APRS Special Interest Group" <aprssig@lists.tapr.org>
Sent: Monday, March 24, 2003 12:05 PM
Subject: [aprssig] Re: Radiation monitoring and APRS
>Maybe what's needed is a whole class of 'environmental contaminants' that
>would include specifics such as various radiations with 'exposure rates'
>and things like 'biological hazard' and 'chemical hazard' ratings.
>
>Mike
check out www.wa6oft.com/npc
Jim, WA6OFT
----------------------------------------------------------------------
Subject: Re: AX.25, HDLC, KISS, and bit stuffing
From: John Hansen <hansen@fredonia.edu>
Date: Mon, 24 Mar 2003 20:01:19 -0500
X-Message-Number: 29
At 11:53 PM 3/24/03 +0000, Miller Scott Contr 30SCS/FTI wrote:
>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?
Correct. You don't have to worry about either bit stuffing or the CRC
calculation.
John W2FS
----------------------------------------------------------------------
Subject: Re: AX.25, HDLC, KISS, and bit stuffing
<LYR30523-125732-2003.03.24-18.43.04--kb2scs#optonline.net@lists.tapr.org>
From: kb2scs@optonline.net
Date: Mon, 24 Mar 2003 20:16:16 -0500
X-Message-Number: 30
Hi Scott
You are correct a TNC in KISS mode Takes care of the Bit
Stuffing. What you have to program is the encoding and decoding
of the AX25 frame on the serial connection to and from the TNC.
----------------------------------------------------------------------
Subject: Re: Radiation monitoring and APRS
From: psschwarz@kellnet.com
Date: Tue, 25 Mar 2003 02:48:33 GMT
X-Message-Number: 31
Steve Jones writes:
>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.
Alpha is of great concern. Air does not stop alpha particles, but skin does.
Alpha particles are far more dangerous than gamma radiation WHEN inhaled or
ingested. It has more to do with time of decay than ability to penetrate.
Radon gas is a good example. Gamma radiation penetrates through the body as
do neutrons resulting in a short exposure time. Alpha particles that are
inhaled or ingested stay in the body for a significantly greater length of
time causing long-term damage. Enough...
>Isn't the Sievert an SI unit?
Scouring through my books didn't produce Sievert being an SI unit, but I
won't discount it.
>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.
Correct. mrems per hour is the standard exposure rate taken in nuke plants.
And becquerels are disintegrations per second often used in nuclear medicine
or to determine the length of time an amount of substance will decay to x%,
often the number of half-lifes.
As for Davis Besse, that's a whole separate argument. The situation, while
dangerous, was certainly not unnoticed. It's unfortunate that the
maintenance crew is under such strict rules via the NRC and management that
they were caught in the middle. Silently, the head of Nuclear Power was
canned, but publicly he was "moved to a new position."
Patrick...KB8RTZ...
----------------------------------------------------------------------
Subject: OT - Repeaters accessable from Disney World Parks
From: kd4ydc@juno.com
Date: Tue, 25 Mar 2003 03:00:05 GMT
X-Message-Number: 32
Sorry for the off topic question.
I am taking my band down to Disney this weekend. I know some of you are
down in that area. Have any of the repeaters changed? Interested in 2 /
440. Any better than others?
Thanks,
Robert Burton
---
END OF DIGEST
Read previous mail | Read next mail
| |
