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ZL3AI > APRDIG 03.01.07 20:49l 242 Lines 9310 Bytes #999 (0) @ WW
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Subj: [APRSSIG] Vol 31 #2, 1/2
Path: DB0FHN<DB0MRW<DB0SON<DB0ERF<DB0FBB<DB0IUZ<DB0GOS<ON0AR<VK6HGR<ZL2BAU
Sent: 070103/1925Z @:ZL2BAU.#79.NZL.OC #:24825 [Waimate] $:9461-ZL3AI
From: ZL3AI@ZL2BAU.#79.NZL.OC
To : APRDIG@WW
Today's Topics:
1. Re: Re: power poles (oh noooo) (Steve Dimse)
2. Re: Re: power poles (oh noooo) (Dale Blanchard)
3. [OT] TI MSP430/EZ430 Target Boards now available (Brian B. Riley)
4. RE: [Kenwood_TH-D7] TH-D7 Power up problem (Herb Gerhardt)
5. Re: power poles.......... (Al Wolfe)
6. RE: UPS (Dave Baxter)
7. Happy New Year from the Tier 2 Network! (Phillip B. Pacier)
----------------------------------------------------------------------
Message: 1
Date: Mon, 1 Jan 2007 14:24:42 -0500
From: Steve Dimse <steve_at_dimse.com>
Subject: Re: [aprssig] Re: power poles (oh noooo)
On Dec 31, 2006, at 8:43 PM, Dale Blanchard wrote:
>power poles can not cause a fire.
>something else has to be involved.
Yes, electricity. A corroded connection will have a non-zero resistance. As
current flows through it, the resistance causes the generation of heat.
Enough heat can cause plastic insulation to catch fire.
>Mine get wet all the time on my motorcycle.
There is a huge difference between fresh and saltwater. Until you have
tried to maintain electronics on a boat kept in the ocean you cannot begin
to appreciate the corrosiveness of saltwater.
I have no idea if PowerPoles are more or less likely to succumb to
corrosion and fire than other connectors, but I have no doubt it could
happen.
Steve K4HG
------------------------------
Message: 2
Date: Mon, 01 Jan 2007 13:48:39 -0800
From: Dale Blanchard <wa7ixk_at_earthlink.net>
Subject: Re: [aprssig] Re: power poles (oh noooo)
Steve Dimse wrote:
>
>On Dec 31, 2006, at 8:43 PM, Dale Blanchard wrote:
>
>>power poles can not cause a fire. something else has to be involved.
>
>Yes, electricity. A corroded connection will have a non-zero
>resistance. As current flows through it, the resistance causes the
>generation of heat. Enough heat can cause plastic insulation to catch
>fire.
>
>>Mine get wet all the time on my motorcycle.
>
>There is a huge difference between fresh and saltwater. Until you have
>tried to maintain electronics on a boat kept in the ocean you cannot
>begin to appreciate the corrosiveness of saltwater.
>
>I have no idea if PowerPoles are more or less likely to succumb to
>corrosion and fire than other connectors, but I have no doubt it could
>happen.
>
>Steve K4HG
>
>There are connectors more suitable for marine use and should be used.
Power poles should be ok for temporary use with removable equipment.
There is a reason I live in the desert.
But if desert alkali dust gets wet it is as bad as saltwater.
I just don't see blaming stupidity on power poles.
Dale
------------------------------
Message: 3
Date: Mon, 1 Jan 2007 17:50:08 -0500
From: "Brian B. Riley" <brianbr_at_mac.com>
Subject: [aprssig] [OT] TI MSP430/EZ430 Target Boards now available
"QRP-L(QTH)" <qrp-l_at_mailman.qth.net>, njqrp_at_njqrp.org, TAPR APRS TAPR
APRS Sig <aprssig_at_lists.tapr.org>
I just got my January '07 issue of Nuts and Volts and on page 7 there was a
TI ad for MSP430F2012 'target boards.' These are directly compatible with
the EZ430 USB key programming debugging tool. The price is 3 boards for $10
which is a pretty good price.
Screen=PROD&Product_Code=EZ430-T2012>
Now, the '2012' is not a misprint or one of my infamous typos.. The
original EZ430 USB key unit had a target board with MSP430F2013. The F2013
and F2012 are almost identical. The sole difference is that the
MSP430F20123 has a single channel 16 bit sigma-delta a/d converter and the
MSP430F2012 has instead an 8 channel 10 bit fast a/d converter.
[commercial content deleted]
---
cheers... 73 de brian riley, n1bq, underhill center, vermont
Home of the
K107 Serial LCD Controller Kit FT817 Power Conditioner Kit
Tab Robot Laser Tag Kit MSP430 Chips and Connectors
Propeller Robot Controller SX48 "Tech Board" Kit
------------------------------
Message: 4
Date: Mon, 1 Jan 2007 15:26:22 -0800
From: "Herb Gerhardt" <hgerhardt_at_wavecable.com>
Subject: [aprssig] RE: [Kenwood_TH-D7] TH-D7 Power up problem
SAR_APRS_at_yahoogroups.com
Since I did not get any responses to my original post, I finally got around
to opening up this radio to see if it was anything obvious. I could not see
anything obvious and to take the bottom PC board off, I would have to
unsolder some shielding. Am not willing to go that far at the moment unless
our county DEM authorizes it first.
From what I have figured out so far is that the problem appears to be part
of the disconnect tab inside the external power connector. It appears this
disconnect remains in the disconnected position with an external power
connector connected or not. Connecting external power to the external power
connector does put 12 volts to the normal battery tabs on the back of the
radio. This is the normal charging voltage for the battery, so it appears
that I would need to replace the external power connector.
Has anyone ever had this connector fail? Has anyone ever replaced it?
Where did you purchase the replacement connector? How difficult of a job is
it to replace this power connector? Has anyone ever sent their radio to
Kenwood to have this connector replaced? If so, what did they charge for
the repairs.
I am looking for answers to these questions so that I can better discuss the
next COA with my local DEM.
Thanks,
Herb
>-----Original Message-----
>
>Our county recently tried to use their TH-D7 SAR tracker I set up for them
>several years ago and they could not make it work. I did my darnedest to
>try to talk them through all the possible problems. I did not
>succeed. So,
>I now have the entire tracker here at my house for troubleshooting.
>
>Here is what I discovered so far:
>
>1. Even with a good fully charged battery attached, it will not power up.
>I bent the radio contacts out some more but that did not help.
>
>2. With 12+ V attached to the external plug, I can read voltage (11.6 V,
>which is normal since a diode is involved) on the normal battery connection
>terminals.
>
>3. The external battery pack cable that I made for them years ago, causes
>intermittent connection to the radio. It does the same when connected to my
>radio. I built a new cable using the power connectors I bought from Mouser
>and those are also too loose and work intermittently. This
>looseness/intermittent connection was experienced on both the county's SAR
>TH-D7 and my personal TH-D7 radio.
>
>4. I supplied external power to the normal radio battery terminals on the
>SAR TH-D7 and it will NOT power up. Applying the same power to the battery
>terminals on my radio makes mine work just fine.
>
>So, it appears that there is a problem between the normal battery terminals
>on the back of the DEM radio to the circuit board inside the radio. Joy,
>joy...... I have never seen or heard of such a problem. Is there anyone
>that has seen this problem before? If so, what did you do to fix it?
>
>My late elk hunting season starts tomorrow, so this radio problem will have
>to wait till after my hunting season. Any inputs in the mean time would be
>appreciated.
>
>The unfortunate part of this problem is that this is the first time that
>they really tried to use this TH-D7 tracker during an actual search. Sure
>would have been nice if it had worked. I have been trying for years to get
>them to use this tracker during an actual search and now when they finally
>tried it, it would not work. It worked just fine about a year ago when I
>checked it out. As far as I know, no one has used it since then.
>
>Herb, KB7UVC
>Mason County ARES/RACES ex-President & APRS Coordinator
>
>Mason County ComVan: http://map.findu.com/KB7UVC-1
>Mason County Relay Truck: http://map.findu.com/KB7UVC-2
>Mason County EOC: http://map.findu.com/KB7UVC-3
>Mason County Foot Tracker: http://map.findu.com/KB7UVC-6
------------------------------
Message: 5
Date: Mon, 1 Jan 2007 23:25:29 -0600
From: "Al Wolfe" <awolfe_at_Route24.net>
Subject: [aprssig] Re: power poles..........
If you are concerned about power pole connectors in a damp environment
just fill them with silicon grease before you shove them together.. Can be
messy but it works well. Vaseline, Penatrox, axle grease, etc, have been
used as well.
Al. K9SI
------------------------------
Message: 6
Date: Tue, 2 Jan 2007 09:23:33 -0000
From: "Dave Baxter" <dave_at_emv.co.uk>
Subject: RE: [aprssig] UPS
Sorry to go back to this, but only just seen the thread.
As others have said, the best way to use a UPS, is use it as it was
designed, to back up 115 (or 230) Volts AC, for equipment that needs it,
and use more regular or custom devices to "float charge" dedicated 12V
battery or batteries for radio's TNC's and whatever.
Note also, that in many UPS's the internal batteries (again as already
said) are not always 12V (never seen one with less than 24V myself over
hear in the UK) and also not always if ever "Ground Referenced", so hanging
other equipment off the UPS's battery could (as also mentioned) not only
screw up the UPS's internal battery sensing for charging, but could also
risk all sorts of DC ground offset and loop problems, ranging from at best
odd noises to smoke!
Best use them as the makers intended....
Take care..
Dave G0WBX.
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