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ZL3AI > APRDIG 02.04.04 14:51l 288 Lines 10541 Bytes #999 (0) @ WW
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To : APRDIG@WW
TAPR APRS Special Interest Group Digest for Tuesday, March 30, 2004.
1. Re: New tracker design suggestions
2. Re: New tracker design suggestions
3. Re: New tracker design suggestions
4. Re: New tracker design suggestions
5. Re: Dual Band On The Glass Antennas
6. Re: New tracker design suggestions
7. RE: Satcom Gates
8. Re: New tracker design suggestions
9. Balloon recovered - thanks for all help!
10. Re: New tracker design suggestions
11. Re: New tracker design suggestions
12. Re: New tracker design suggestions
13. Re: New tracker design suggestions
14. Re: New tracker design suggestions
15. Re: New tracker design suggestions
16. Re: New tracker design suggestions
17. Kenwood TM-D700A as a DIGI?
18. RE: Kenwood TM-D700A as a DIGI?
19. Re: New tracker design suggestions
20. RE: Kenwood TM-D700A as a DIGI?
21. Re: New tracker design suggestions
22. Re: New tracker design suggestions
23. RE: Kenwood TM-D700A as a DIGI?
24. Re: New tracker design suggestions
25. RE: Kenwood TM-D700A as a DIGI?
26. RE: [despammed] RE: Kenwood TM-D700A as a DIGI?
27. Re: New tracker design suggestions
28. Re: New tracker design suggestions
29. Re: New tracker design suggestions
30. Re: Kenwood TM-D700A as a DIGI?
31. Re: New tracker design suggestions
32. Re: New tracker design suggestions
33. [Fwd: pm maps 6.0 problem]
34. RE: [Fwd: pm maps 6.0 problem]
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Subject: Re: New tracker design suggestions
From: Derek Koonce <redderek@jps.net>
Date: Mon, 29 Mar 2004 21:13:36 -0800 (PST)
X-Message-Number: 1
I am involved with a couple of projects that require high power off batteries.
In my search for a good battery I have found that alkalines have a better power
density than NiCADs. You can stack up NiCADs for a particular voltage, but to
get to the same AHr as alkaline you will need more volume. This is not good for
a SAR team.
SAR teams use AA because they are readily available. I have a redesigned TT3
board that uses a single AA battery. I have gotten over 24 hours on a single AA
battery - I am sure it could double this time if the LEDs were disconnected. I
use a small switcher on the back of the PCB that uses 4 external components.
Derek.
KE6JTP
-----Original Message-----
From: "Curt, WE7U" <archer@eskimo.com>
Sent: Mar 29, 2004 9:49 AM
To: TAPR APRS Special Interest Group <aprssig@lists.tapr.org>
Cc: TAPR APRS Special Interest Group <aprssig@lists.tapr.org>
Subject: [aprssig] Re: New tracker design suggestions
On Mon, 29 Mar 2004, David VanHorn wrote:
> At 09:23 AM 3/29/2004 -0800, Scott Miller wrote:
>
> >> 1) An extremely low-power digi, that we can throw into an ammo-can
> >> with a low-current handheld and a gell-cell.
> >
> >Yeah, that's one of the planned uses. I've been considering a built-in NiMH
charger circuit. Probably not worth it though, considering you still have to
power the radio and doing that with a gel cell in an ammo can is fairly easy to
do.
>
> Twice the weight for same power, or half the power per unit volume though.
>
> NIMH charging isn't too hard, but start with fully spec'd cells.
> Sanyo "C" series cells can be used with Nicad charger circuits, long term low
overcharge dosen't bother them much.
>
> Radio power is interesting as well. Lowest possible current on receive, not
very important what it draws on transmit.
>
> Maybe no receiver at all, though you pay for it in collisions.
That's fine for _some_ portable trackers (although not what I
envision long-term for SAR), but doesn't work for a repeater, which
was what the ammo-can setup I mentioned is for.
The same setup (ammo-can with TX/RX radio/TNC) can be used as a
quick-to-setup mobile rig for SAR, so we can move it to whatever
vehicle we're using at the time. There it's better to use a
gel-cell, a cigarette-lighter plug, and a mobile rig though.
I'd like to see TX/RX for portable trackers as well, so that the
positions of nearby teams can be displayed on the Garmin map screen.
Yes, this involves more complexity in the TNC and radio, and higher
current consumption hence extra battery weight, but I think it's
worth it.
Those that don't want to pay the cost/weight penalty can run
something more like the pockettracker (TX-only radio/TNC) and a GPS.
--
Curt, WE7U archer at eskimo dot com
Arlington, WA, USA http://www.eskimo.com/~archer
----------------------------------------------------------------------
Subject: Re: New tracker design suggestions
From: "Stephen H. Smith" <WA8LMF2@aol.com>
Date: Mon, 29 Mar 2004 22:05:41 -0800
X-Message-Number: 2
David VanHorn wrote on 3/29/2004, 11:47 AM:
> We'd have a revolt if I asked one person from each team
> >to carry a tracker using a set of D's. AA's and a tracker I think I
> >can get away with.
>
> AAs make a lot of sense. I'm trying to keep all my emergency gear in AAs.
I just discoverd an improbable source for cheap alkaline AA cells.
Last week I was in IKEA (the Swedish home furnishings chain) and was
amazed to see them selling 10-packs of German-made Varta AA alkalines
for only $1.99! Similar low prices on AAAs and Cs but I didn't see any
Ds. This seemed to be an everyday price; not a promotion or special,
btw.
Stephen H. Smith wa8lmf (at) aol.com
Home Page: http://wa8lmf.com
Ham Radio/Mobile SSTV page: http://members.aol.com/wa8lmf/ham
APRS Stuff
http://members.aol.com/wa8lmf/aprs
Radio Communications Systems Personal Computers
Consulting and Systems Integration
GPS Custom Mapping & Radio Coverage Surveys
File Conversions MS-Windows Setups Networking
----------------------------------------------------------------------
Subject: Re: New tracker design suggestions
From: Dale Blanchard <wa7ixk@earthlink.net>
Date: Mon, 29 Mar 2004 22:27:18 -0800
X-Message-Number: 3
Stephen H. Smith wrote:
>I just discovered an improbable source for cheap alkaline AA cells.
>
>Last week I was in IKEA (the Swedish home furnishings chain) and was
>amazed to see them selling 10-packs of German-made Varta AA alkalines
>for only $1.99! Similar low prices on AAAs and Cs but I didn't see any
>Ds. This seemed to be an everyday price; not a promotion or special,
>btw.
>
>
I found some AA nicads in a Aroma Therapy shop for 50 cents ea. They
were not the newer hi cap type ,
but good enough for my Ant analyzer. They advertised them in the local
paper or i would have have been in there.
Forgot to get some for my Solar lights.
----------------------------------------------------------------------
Subject: Re: New tracker design suggestions
From: "Mike Yetsko" <myetsko@insydesw.com>
Date: Tue, 30 Mar 2004 04:12:35 -0500
X-Message-Number: 4
Just keep in mind that alkaline batteries have a MUCH higher internal
resistance than NiCads, and you can very quickly hit current limit
issues when you start trying to draw too much power out of a stack
of AAs.
Mike
----- Original Message -----
From: "Derek Koonce" <redderek@jps.net>
To: "TAPR APRS Special Interest Group" <aprssig@lists.tapr.org>
Cc: "TAPR APRS Special Interest Group" <aprssig@lists.tapr.org>
Sent: Tuesday, March 30, 2004 12:13 AM
Subject: [aprssig] Re: New tracker design suggestions
> I am involved with a couple of projects that require high power off
batteries. In my search for a good battery I have found that alkalines
have a better power density than NiCADs. You can stack up NiCADs for a
particular voltage, but to get to the same AHr as alkaline you will need
more volume. This is not good for a SAR team.
>
> SAR teams use AA because they are readily available. I have a redesigned
TT3 board that uses a single AA battery. I have gotten over 24 hours on a
single AA battery - I am sure it could double this time if the LEDs were
disconnected. I use a small switcher on the back of the PCB that uses 4
external components.
>
> Derek.
> KE6JTP
>
>
> -----Original Message-----
> From: "Curt, WE7U" <archer@eskimo.com>
> Sent: Mar 29, 2004 9:49 AM
> To: TAPR APRS Special Interest Group <aprssig@lists.tapr.org>
> Cc: TAPR APRS Special Interest Group <aprssig@lists.tapr.org>
> Subject: [aprssig] Re: New tracker design suggestions
>
> On Mon, 29 Mar 2004, David VanHorn wrote:
>
> > At 09:23 AM 3/29/2004 -0800, Scott Miller wrote:
> >
> > >> 1) An extremely low-power digi, that we can throw into an ammo-can
> > >> with a low-current handheld and a gell-cell.
> > >
> > >Yeah, that's one of the planned uses. I've been considering a
built-in NiMH charger circuit. Probably not worth it though, considering
you still have to power the radio and doing that with a gel cell in an
ammo can is fairly easy to do.
> >
> > Twice the weight for same power, or half the power per unit volume
though.
> >
> > NIMH charging isn't too hard, but start with fully spec'd cells.
> > Sanyo "C" series cells can be used with Nicad charger circuits, long
term low overcharge dosen't bother them much.
> >
> > Radio power is interesting as well. Lowest possible current on
receive, not very important what it draws on transmit.
> >
> > Maybe no receiver at all, though you pay for it in collisions.
>
> That's fine for _some_ portable trackers (although not what I
> envision long-term for SAR), but doesn't work for a repeater, which
> was what the ammo-can setup I mentioned is for.
>
> The same setup (ammo-can with TX/RX radio/TNC) can be used as a
> quick-to-setup mobile rig for SAR, so we can move it to whatever
> vehicle we're using at the time. There it's better to use a
> gel-cell, a cigarette-lighter plug, and a mobile rig though.
>
> I'd like to see TX/RX for portable trackers as well, so that the
> positions of nearby teams can be displayed on the Garmin map screen.
> Yes, this involves more complexity in the TNC and radio, and higher
> current consumption hence extra battery weight, but I think it's
> worth it.
>
> Those that don't want to pay the cost/weight penalty can run
> something more like the pockettracker (TX-only radio/TNC) and a GPS.
>
> --
> Curt, WE7U archer at eskimo dot com
> Arlington, WA, USA http://www.eskimo.com/~archer
>
>
> ---
> You are currently subscribed to aprssig as: myetsko@insydesw.com
> To unsubscribe send a blank email to leave-aprssig-22306P@lists.tapr.org
> Questions regarding the SIG go to the SIG administrator: wa1lou@tapr.org
>
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