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ZL3AI > APRDIG 21.03.07 09:05l 229 Lines 9076 Bytes #999 (0) @ WW
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Subj: [APRSSIG] Vol 33 #18, 1/3
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From: ZL3AI@ZL2BAU.#79.NZL.OC
To : APRDIG@WW
Today's Topics:
1. Balloon Paths again... (Robert Bruninga)
2. Re: Balloon Paths again... (Robert Rochte)
3. TM-D710A? is TH-D7a(g) MKII on the way? (Thomas t)
4. Re: TM-D710A? is TH-D7a(g) MKII on the way? (Keith VE7GDH)
5. Re: D700 bugs (Keith VE7GDH)
6. Road Trip - Lessons Learned (Joel Maslak)
7. Does anyone have a fix for the intermittant tone encoder on the TH-d7ag
70cm side? (Thomas t)
8. Re: Re: D700 bugs (Rich Mulvey)
9. D710A ports - was Re: D700 bugs (David Flood)
10. Re: Does anyone have a fix for the intermittant tone encoder on the
TH-d7ag 70cm side? (Keith VE7GDH)
11. Re: Does anyone have a fix for the intermittant tone encoder on the
TH-d7ag 70cm side? (Thomas t)
12. Re: TM-D710A? is TH-D7a(g) MKII on the way? (Jan T. Pharo)
13. Re: Does anyone have a fix for the intermittant tone encoder on the
TH-d7ag 70cm side? (Keith VE7GDH)
14. Re: Does anyone have a fix for the intermittant tone encoder on the
TH-d7ag 70cm side? (Robbie, wa9inf)
15. Re: D710A ports - was Re: D700 bugs (Chuck Gooden)
----------------------------------------------------------------------
Message: 1
Date: Sat, 17 Mar 2007 18:28:57 -0400
From: "Robert Bruninga" <bruninga_at_usna.edu>
Subject: [aprssig] Balloon Paths again...
The recommendation for Balloons is to use the path of VIA WIDE2-2.
This limits QRM yet provides good tracking on the ground:
1) At altitude it hits every digi IN RANGE ONCE.
2) The N-N dupe-elimination works perfectly. Minimum QRM.
2) It does not bring up every home station (running WIDE1-1)
3) Yet the balloon goes 2 hops on the ground for finding it.
Using the path of WIDE1-1,WIDE2-2 is as *bad* as using the old RELAY,WIDE
was before! This is because it brings up every home digi over a dozen
states plus all big digis causing significant QRM.
The recommendation for Balloons is to use the path of VIA WIDE2-2.
WIDE1-1 is not supposed to be used other than the first hop so that only
one WIDE1-1 digi at most is ever involved in any packet.. Using WIDE1-1 at
altitude does not have this inherent limiting of QRM to only one home digi
and in fact has an amplifying effect of maximum QRM from all fill-in digis.
The recommended path for Balloons is WIDE2-2. This has been worked out
over the last 15 years of APRS experience as the best for the balloon
opeprator and the best for the APRS network and all other users too. The
probability of falling near a WIDE1-1 digi is so small that the tiny
benefit of using the W1-1,W2-2 path is not generally worth the significant
increase in QRM over a dozen states throughout the flight.
Bob, Wb4APR
-----Original Message-----
Sent: Saturday, March 17, 2007 3:16 PM
>... I'm trying to estimate the final landing spot of the KC8UCH-11
>balloon...... I see from... FindU:
>
>KC8UCH-11>APOT02,VE9GFI-2,WIDE1*,WIDE2-1,qAS,VE9APR:!3537....
------------------------------
Message: 2
Date: Sat, 17 Mar 2007 18:04:26 -0500
From: "Robert Rochte" <rochte_at_gmail.com>
Subject: Re: [aprssig] Balloon Paths again...
The Open Tracker in this balloon was set to switch to WIDE2-2 above 1000
meters altitude. The GPS failed, however, shortly after flight and so the
Open Tracker never switched to the other path.
Stuff happens, ya know... :)
73,
Robert KC8UCH
------------------------------
Message: 3
Date: Sat, 17 Mar 2007 17:46:27 -0700 (PDT)
From: Thomas t <hamaddict2001_at_yahoo.com>
Subject: [aprssig] TM-D710A? is TH-D7a(g) MKII on the way?
Does anyone know what the difference is between the Kenwood TM-D710A (see
FCC ID:K44397400 -
https://gullfoss2.fcc.gov/prod/oet/forms/blobs/retrieve.cgi?attachment_id=76850n
4&ative_or_pdf=pdf)
and the D700? The 710 manual isnt up on the FCC website yet, but a picture
of it is.
Is this a prelude to a bug free TH-D7a(g)?
73,
Tom - N2YTF
------------------------------
Message: 4
Date: Sat, 17 Mar 2007 18:52:14 -0700
From: "Keith VE7GDH" <ve7gdh_at_rac.ca>
Subject: Re: [aprssig] TM-D710A? is TH-D7a(g) MKII on the way?
Tom N2YTF wrote,,,
>Does anyone know what the difference is between the Kenwood
>TM-D710A (see FCC ID:K44397400 -
>https://gullfoss2.fcc.gov/prod/oet/forms/blobs/retrieve.cgi?attachment_id=7685&
04native_or_pdf=pdf)
>and the D700? The 710 manual isnt up on the FCC website yet, but a
>picture of it is. Is this a prelude to a bug free TH-D7a(g)?
Dunno about a D7 replacement, but I take it that the D710A is awaiting type
acceptance and that it will be a D700 replacment. I didn't have any success
with your link, but there are some pics courtesy of James VE6SRV at
http://members.shaw.ca/jewen/NWAPRS/external%20photos.pdf
73 es cul - Keith VE7GDH
--
"I may be lost, but I know exactly where I am!"
------------------------------
Message: 5
Date: Sat, 17 Mar 2007 20:11:23 -0700
From: "Keith VE7GDH" <ve7gdh_at_rac.ca>
Subject: [aprssig] Re: D700 bugs
Mark WA2MCT wrote...
>There are no bugs in the D700. It is the perfect APRS mobile radio.
>If it doesn't do what you want or need, you're using APRS incorrectly.
>At least that's what a guy with APR in his call claims! :-)
>I'd certainly welcome some improvements.
Lemme see... it doesn't do SmartBeaconing. Not a factor for stand-alone use,
but the small buffer is sometimes a big problem in KISS mode. Then there's
the male DB-9 (DE-9) connector on it. I wouldn't turn down a D700 if you
gave me one, but see the HamHUD for improvements. I'm sure the D710A
will be a step up from the D700, but I'm also sure it will leave room for
improvement too!
PS - I assume you meant to send your note to the APRS SIG and not direct to
me, so I posted my reply there.
73 es cul - Keith VE7GDH
--
"I may be lost, but I know exactly where I am!"
------------------------------
Message: 6
Date: Sat, 17 Mar 2007 21:17:24 -0600
From: Joel Maslak <jmaslak-aprs_at_antelope.net>
Subject: [aprssig] Road Trip - Lessons Learned
I tried a small caravan with another family member this weekend. I decided
to use APRS to track the other vehicle (I have a dash-mounted GPS unit
hooked up to the D700, so I was planning on using it to track the other
vehicle).
The tracker was a Garmin eTrex (yellow one) hooked to a D7 with an external
antenna (1/4 wave magmount).
Lessons learned:
Portability of the tracker is nice, but not nearly as important as
robustness and difficulty for accidental reconfigurations. I might go to a
business class radio next time, with only one channel programmed into it.
Early in the trip, I realized I wasn't seeing the other vehicle, so we
stopped and took a look. I was off- frequency, as a control got bumped. I
fixed that and the trip went pretty well.
Taking off-the-shelf batteries (AAs) in the radio and the GPS was very
handy. They work. Rechargables should work but often don't (probably
because I can just buy AA batteries while I have to care for and charge
rechargables).
Ready made cables were a big plus. Yes, I could solder the connectors
together. But not having to do that meant I had a cable that I actually
trusted to stay connected.
I did 1 minute beacons for the "dumb" vehicle. I am not sorry about that
at all. Even one minute at 70 MPH is quite some distance. Smart beaconing
would be better. Too bad my GPS+D700 doesn't do dead reckoning. I figured
back east we are out of an area's coverage relatively quickly, minimizing
QRM. Obviously I shut things off when stationary for more than a few
minutes.
I used a path of WIDE1-1. I also set the mobile D700 (50 W vs 2.5 W!) to
digi WIDE1-1 (yes, I know, bad practice in general), to let the packets
from the dumb tracker get a bit further in the boondocks (most of the trip
had no local digi coverage even with a 50 W mobile). I might do
WIDE1-1,WIDE2-1 next time to let it reach into the internet easier (I can
pull up findu via my cell phone, so if we got seperated, couldn't hear a
common digi, but the other tracker was within range of some digis, it'd be
good to make it into the inet). This was handy because at one point we were
separated by about 8 miles, outside of simplex range, but a local digi was
hearing the dumb tracker and my vehicle heard that fine. I was able to
meet up with the dumb tracker reasonably easy even with both of us moving
down an interstate. It was nice for one party to be able to do a quick
stop without fear of being separated. We had cell phones as backup, but we
didn't need them.
We also used FRS between the vehicles. That didn't work nearly as well -
after more than 1/4 mile or so at the most, we lost communication that way.
One of the neatest examples was when we arrived at our destination and
needed to find a hotel. The other car was separated from me (I took a
wrong turn). I was able to still use FRS to talk to them, but their
directions made no sense to me. But I saw them on my GPS and drove right
to the hotel parking lot that they were in.
This was hardly a life-and-death situation, and we would do fine without
having APRS, but it was a nice thing to play with.
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