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ZL3AI > APRDIG 20.03.07 12:13l 277 Lines 9939 Bytes #999 (0) @ WW
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Subj: [APRSSIG] Vol 33 #15, 1/1
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From: ZL3AI@ZL2BAU.#79.NZL.OC
To : APRDIG@WW
Today's Topics:
1. mobile antenna for D7? (Chris Kantarjiev)
2. Re: mobile antenna for D7? (Tyson S.)
3. Re: mobile antenna for D7? (w2pi_at_optonline.net)
4. Re: mobile antenna for D7? (Mark Earle)
5. RE: mobile antenna for D7? ('Scott Miller')
6. Re: APRS at Dayton (Joel Maslak)
7. APRSPOINT (Edwards, Chris)
8. RE: APRS at Dayton (Robert Bruninga)
----------------------------------------------------------------------
Message: 1
Date: Wed, 14 Mar 2007 11:10:22 -0700 (PDT)
From: Chris Kantarjiev <cak_at_dimebank.com>
Subject: [aprssig] mobile antenna for D7?
I'll ask this on the D7 list as well, but I think I'll get a more useful
response here.
I'm revisiting my antenna choice for my vehicles. I've been using a couple
of different mag mount antennas which are very flexible. That's nice from a
stealth point of view (they're pretty much invisible), but the flex causes
enough frequency shift that the D7 doesn't decode most packets while in
motion.
I'm giving up on mag mounts, and will probably use a Diamond K600 trunk lid
mount. The question, then, is what antenna to attach to it.
On another vehicle, I'm probably stuck with a through-glass antenna, though
I'm not sure of that yet.
I'd really like to hear from folks that have had good luck with a mobile
D7.
Thanks!
73 de chris K6DBG
------------------------------
Message: 2
Date: Wed, 14 Mar 2007 11:57:52 -0700 (PDT)
From: "Tyson S." <timbercutter_at_yahoo.com>
Subject: Re: [aprssig] mobile antenna for D7?
One thing to keep in mind is that NMEA data entering a D7 from the cable
will degrade your reciever. There are various web sites that explain how
you are usually transmitting better than you think while mobile. But I use
a regular dual band antenna on my truck with an adapter from SMA to BNC and
it works pretty good.
------------------------------
Message: 3
Date: Wed, 14 Mar 2007 19:16:00 +0000 (GMT)
From: w2pi_at_optonline.net
Subject: Re: [aprssig] mobile antenna for D7?
I use a glass-mount dual band antenna with good success. It's actually
mounted near the bottom of the window, to keep the top of the antenna below
the 6'4" height of the garage I park in at work.
Paul, W2PI (-7)
------------------------------
Message: 4
Date: Wed, 14 Mar 2007 14:24:03 -0600
From: Mark Earle <wa2mct_at_mearle.com>
Subject: Re: [aprssig] mobile antenna for D7?
Tyson S. wrote:
>One thing to keep in mind is that NMEA data entering a D7 from the cable
>will degrade your reciever. There are various web sites that explain how
>you are usually transmitting better than you think while mobile. But I use
>a regular dual band antenna on my truck with an adapter from SMA to BNC and
>it works pretty good.
Huh? I'm not trying to pick a nit, but low speed serial data causes
receiver degradation how?
What do you mean degradation? Reduced sensitivity? Reduced selectivity?
Intermodulation distortion? Overload?
------------------------------
Message: 5
Date: Wed, 14 Mar 2007 12:59:29 -0700
From: "'Scott Miller'" <scott_at_opentrac.org>
Subject: RE: [aprssig] mobile antenna for D7?
I wasn't aware of the D7 issue, but I know the Alinco DR-135 tends to get
some noise on the speaker from the GPS serial data. There's definitely
some crosstalk going on.
Don't forget that even with low-speed serial data, you can have fast slew
rates. A MAX232 will slew from -6 volts to +6 volts in about 1
microsecond. I wonder if adding some capacitance to the line would help...
just dampen the slew rate out until it's just good enough for the RS-232
receiver in the radio to work reliably.
Scott
N1VG
------------------------------
Message: 6
Date: Wed, 14 Mar 2007 22:23:29 -0600
From: Joel Maslak <jmaslak-aprs_at_antelope.net>
Subject: Re: [aprssig] APRS at Dayton
On Mar 14, 2007, at 8:24 AM, Robert Bruninga wrote:
>I hope to go to Dayton this year and hope to see lots of APRS
>activity.
>
>I hope all travelers will set for VoiceAlert while enroute.
And *EVEN MORE IMPORTANT*: DON'T SET VOICE ALERT WHEN NOT PRESENT AT THE
RIG, ABLE, AND WILLING TO ANSWER CALLS.
How I do that is switching between two memory channels based on whether or
not I feel like answering calls.
And of course it never hurts to try 146.52 if you see a nearby mobile (on a
GPS screen if so equipped). I had a nice QSO last week as a result of
giving a call on 52 after seeing their station icon. I encourage people to
also monitor 52 simplex if not monitoring a local repeater (the D700 makes
this rather easy to do - I typically keep one side on 144.39 and the other
on 146.52).
------------------------------
Message: 7
Date: Thu, 15 Mar 2007 07:58:42 -0500
From: "Edwards, Chris" <cedwards_at_trane.com>
Subject: [aprssig] APRSPOINT
We are starting to setup for our annual June Triathlon here in Macon, GA. I
was looking into whether or not my APRS+SA would do what I need it to do for
the race and I ran across APRSPOINT. Any body use that program? It would
make me bail out on Delorme Street Atlas by having to purchase another
mapping program, but I wondered if it would be better for what we need to
do.
Please contact me if you have some experience with this program. Thanks!
Chris ae4xo
------------------------------
Message: 8
Date: Thu, 15 Mar 2007 11:09:35 -0400
From: "Robert Bruninga" <bruninga_at_usna.edu>
Subject: RE: [aprssig] APRS at Dayton
To Dayton, we also need all SYSOPS within 500 miles of Dayton to make sure
their DIGI is putting out the LOCAL recommended Travelers Repeater freq
objects to inform all travelers where to find other travelers.
These objects show up on the front panel of the APRS radios and the HAMhud.
See the details on: http://www.ew.usna.edu/~bruninga/localinfo.html
>-----Original Message-----
>From: Robert Bruninga
>Sent: Wednesday, March 14, 2007 11:51 AM
>
>The Good news: Dayton has excellent APRS coverage potential
>for Hamvention with existing stations and hardware. Only new
>hardware needed is an Igate that is simplex to the arena.
>
>The Bad news: A quick look on FINDU reveals that less than 10%
>of the digis in and around Dayton are New-N compliant. Without
>New-N, it is impossible for users or anyone looking at FINDU to
>tell what the local Dayton network supports:
>
>>30% lack any PHG antenna height info
>>80% don't show their path support "W#" or "W11"?
>>20% still using RELAY and WIDE
>
>TYPE CALL HAAT DIS DIR Comments
>---- ------- ---- --- --- --------------------------------
>DIGI W8GUC 160' 4 NE No new-N, no path info, no Ovrly
>Home WA8ZWJ 40' 8 NW no indication of W1-1 support
>Home KA8C 20' 8 E no indication of W1-1 support
>Home N8QNM ? 8 NW no indication of W1-1 support
>Home WA8VIW 80' 12 S no indication of W1-1 support
>DIGI KC8QBL-3 ? 19 SE no PHG no New-N no path info
>DIGI WB8BLV 160' 19 SW New-N with "S" overlay, shows W3
>DIGI KC8KQE 40' 31 NE home stn, no new-N, no info
>DIGI WA8SDF-1 ? 32 SW no new-N no info, no W1-1?
>DIGI KC9CJJ-3 40' 36 W New-N. recommends "W3"
>DIGI KA8ZNY10 160' 40 SE old W-R-T, no New-N no W1-1
>
>Simple fixes for Dayton Hamvention:
>
>1) Have all HOME stations support WIDE1-1 as an ALIAS.
>2) Have home digis show "W11" at start of position txt.
>3) Have W8GUC support only W1-1 during hamvention weekend
>and keep its current "support" whether W# or W11 always
>updated in its position text.
>4) put Overlays on all digis and include W# or W11 in texts
>
>The nomencalture "W#" means for the digi to indicate the
>maximum number of hops recommended in the area. If that is
>2 hops, then put in "W2" if it is 3 hops, then "W3". Only
>if it is unlimited use "Wn".
>
>The absence of any HIGH and wide area digis is ideal for a
>high density situation like Hamvention, since it avoides the
>problem of bringing in too much out-of-area QRM. But this
>then requires many home station or fill-in WIDE1-1 digis. It
>appears to me that two more home-stations or fill-in W1-1's
>are needed to the SW and SE about 8 miles or so.
>
>Is there anyone local to Dayton that will take on these
>challenges, at least to contact all of the above stations
>and do the simple changes to W1-1 support, and update
>position-texts PHG's and W#'s so that the network is self-
>explanitory?
>
>Thanks.
>Bob, WB4APR
>
>>-----Original Message-----
>>On Behalf Of Robert Bruninga
>>Sent: Wednesday, March 14, 2007 10:24 AM
>>
>>I hope to go to Dayton this year and see lots of APRS...
>>I hope all travelers will set for VoiceAlert while enroute.
>>
>>The operations of APRS in the center of Dayton can be
>>greatly enhanced by just a few SYSOP settings at the major
>>DIGI's in the area. With these remote-sysop settings,
>>hundreds of APRS mobiles can be accomodated. See:
>>
>>http://eng.usna.navy.mil/~bruninga/aprs/dayton.txt
>>
>>Do we have the Dayton SYSOPS on here? Do they see this
>>as a viable approach? Who can guarantee an Igate in simplex
>>range of HARA arena?
>>
>>Mobiles do *not* need to change their mobile settings
>>enroute Dayton, assuming they are using the receomended
>>New-N settings already (WIDE1-1,WIDE2-1 or 2-2). That is
>>the power of the New-N paradigm is that the local SYSOPS
>>can make a few simle changes to accommodate these hundreds
>>of users without expecting the users to change anything.
>>
>>Either 1) TURN OFF your tracker when parked, or 2) Set
>>packet rate to 30 minutes while parked. At Dayton, it is
>>nice to see parked vehicles on all the screens, but only
>>at the low 30 minute rate.
>>
>>Since 52 will be useless, do we want to designate another
>>simplex APRS Voice frequency in the immediate area? Why
>>not the 445.925 alternate APRS channel?
>>
>>Anything else?
>>
>>Bob, Wb4APR
------------------------------
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