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ZL3AI > APRDIG 03.08.06 00:09l 245 Lines 9590 Bytes #999 (0) @ WW
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Subj: [APRSSIG] Vol 25 #26, 2/2
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From: ZL3AI@ZL2BAU.#87.NZL.OC
To : APRDIG@WW
Message: 8
Date: Wed, 26 Jul 2006 08:50:47 -0400
From: "Robert Bruninga" <bruninga_at_usna.edu>
Subject: Re: [aprssig] using beacon text to advertise voice repeaters
>>>cak_at_dimebank.com 07/24/06 8:53 PM >>>
>I'd like to use an XDigi (four beacons) to advertise a voice repeater
>at the same site, as well as show that it's a W11. I recall that
>one of the concerns is having the text show up well on a D7 screen.
>
>W1 W6WGZ/R 147.180+ info: k6dbg_at_arrl.net
>441.175+ PL146.2 W1 info: k6dbg_at_arrl.net
>W11 Oakhurst Fill-in info: k6dbg_at_arrl.net
>W11 Oakhurst Fill-in info: k6dbg_at_arrl.net
Sorry, but only one of these can be correct, since in APRS a station or
object can only have one POSITION-COMMENT. Anything with multiple POSITION
COMMENT's just eats up everyone's LOG files because every single time the
POSITION-COMMENT changes, that is a "change" and is a new LOG item.
If you want to advertise a different object, then it needs its OWN POSITION
too so that it also has its own objet name.
>my inclination is to make the first two direct, every 30 minutes,
>and the others W2-1 and W2-2, as usual.
If it is a W1 digi, then it should go direct only and every 10 minutes. So
here is my suggestion:
>W1,147.180k6dbg_at_arrl.net
>!DDMM.HHN/DDDMM.HHWmW1,441.175+PL146.2 k6dbg_at_arrl.net
Set BOTH paths to DIRECT and set both to every 20 minutes.
Set one to BEGIN at 00:00:00 and the other at 00:10:00
People passing through will see both of them once every 20 mins.
Or IN THIS CASE, rather than having two beacons and the 20 minuete cycle
time, I think better would be best to put it all in a single packet once
every 10 mintes (direct).
>W1,147.180 441.175+ PL146.2 k6dbg_at_arrl.net
This will show up nicely on the D700 as:
>W6WGZ:
W1,147.180
441.175+
PL146.2
Which is just about perfect. Everything is there, it is well spaced for the
10x10x8 line display of the D7 and D700 (though the D7 will not show the
last line) But most mobiles are D700's...
And it is refereshed every 10 minutes direct for anyone in view. Since it
is mostly a FILL in and Voice repeater advertisement, it makes no sense to
send the packet anywhere except direct to minimize QRM. Since only direct
stations can use either one.
BUT... Since packet only has about half the range of voice and for mobiles,
it might be OK to send this packet via a single HOP. There are two ways
to do this. One is to use WIDE1-1 if there is only one digi that will hear
it. But if it will hit multiple digis in all directions, then it is better
to select only the one digi that best matches the RF coverage of this
digi/rptr and only hit it. IE, by digipeating only via that one digi...
Good luck.
Bob
------------------------------
Message: 9
Date: Wed, 26 Jul 2006 09:53:13 -0400
From: "Wes Johnston, AI4PX" <wes_at_kd4rdb.com>
Subject: Re: [aprssig] using beacon text to advertise voice repeaters
The WIDE1-1 path element below.... should it be WIDE2-1. We are
talking about a digipeater "advertising" an object, so if I've
understood the source of the packet correctly, it would seem that
sending WIDE1-1 from a digi would be a bad thing.
Wes
On 7/26/06, Robert Bruninga <bruninga_at_usna.edu> wrote:
>BUT... Since packet only has about half the range of voice
>and for mobiles, it might be OK to send this packet via
>a single HOP. There are two ways to do this. One is to
>use WIDE1-1 if there is only one digi that will hear it. But
>if it will hit multiple digis in all directions, then it is better to
>select only the one digi that best matches the RF
>coverage of this digi/rptr and only hit it. IE, by digipeating
>only via that one digi...
>
>Good luck.
>Bob
------------------------------
Message: 10
Date: Wed, 26 Jul 2006 10:15:12 -0400
From: "Robert Bruninga" <bruninga_at_usna.edu>
Subject: RE: [aprssig] Mounting 2M Xcvr in '05 Toyota Camry
>Has anyone had any RFI trouble with mounting any of the new
>model 2M transceivers in a late model Toyota Camry ?
I wonder if the ARRL or someone has a WEB page where all problems with RFI
can be documented so that hams can go to one source and see comments from
everyone else on particular problems. If not, it would be a good idea to
start one.
I was taling just this morning to a chap who spent 6 months trying to get
HF mobile and finally just gave up. There was just so much RIF coming from
the car systems, that he couild hear nothing on HF, and when he
transmitted, the car heater or AC would come on and lock up on maximum (hot
or cold) And he would have to shut off the engine to re-boot the system
before it would work again...
These problems in consumer items, especially expensive cars should be
DOUCMENTED!
Bob
------------------------------
Message: 11
Date: Wed, 26 Jul 2006 10:39:54 -0400
From: "Robert Bruninga" <bruninga_at_usna.edu>
Subject: Re: [aprssig] using beacon text to advertise voice repeaters
Yes, normally sending WIDE1-1 is not a good idea from a digi, but in this
case, it is a fill-in digi, and if there is another fill-in digi in range,
then presumably that is also a black hole and so it makes sense to let that
area also see this fill-in digi too... But I agree, generally, WIDE2-1 is
better than WIDE1-1 for high sites.
>>>wes_at_kd4rdb.com 07/26/06 9:53 AM >>>
>The WIDE1-1 path element below.... should it be WIDE2-1. We are
>talking about a digipeater "advertising" an object, so if I've
>understood the source of the packet correctly, it would seem that
>sending WIDE1-1 from a digi would be a bad thing.
>Wes
>
>On 7/26/06, Robert Bruninga <bruninga_at_usna.edu> wrote:
>>BUT... Since packet only has about half the range of voice
>>and for mobiles, it might be OK to send this packet via
>>a single HOP. There are two ways to do this. One is to
>>use WIDE1-1 if there is only one digi that will hear it. But
>>if it will hit multiple digis in all directions, then it is better to
>>select only the one digi that best matches the RF
>>coverage of this digi/rptr and only hit it. IE, by digipeating
>>only via that one digi...
>>
>>Good luck.
>>Bob
------------------------------
Message: 12
Date: Wed, 26 Jul 2006 15:56:01 +0100
From: "Dave Baxter" <dave_at_emv.co.uk>
Subject: RE: [aprssig] Mounting 2M Xcvr in '05 Toyota Camry
Hi...
As an EMC type, and a QRO RF technician, plus knowing more about some
vehicle electrics than I care to admit, I say this...
If you get *Any* "odd" behaviour of the car when transmitting, either stop
transmitting or reduce power levels till the "Odd" behaviour goes away.
Then, at the earliest possibility, review the radio installation to keep RF
away from whatever vehicle system was affected. Until such time, do not
use the radio at those power levels, or at all, if the problem is really
bad.
You are unlikely to "Fry" a car's electrics, or (any of the many)
computers, but you could in extreme cases cause the engine management to go
funny, or cut the motor if it gets really upset. The worst could be that
you are left stranded with a fault light on, and being unable to restart
the engine until a dealer or other techie type resets the management fault
log.
That is for any vehicle, petrol(gas) or diesel with a fly-by-wire engine,
as most are built nowadays. Such problems as your dealer says, if
attributed to your after marked radio installation are unlikely to be
covered by the makers (dealers, or third party) warranty scheme.
The usual things that can happen, are indicators flashing too fast, or not
at all in the presence of high levels of RF, false indications of engine
revs or other information, and things like wipers, window or seat controls
not working as intended. Not usually a safety critical problem, but the
distraction it can cause can be a safety issue.
You are more likely to suffer higher than expected levels of QRM from the
car, to the radio on RX, than cause the car problems. Particularly bad,
are some common rail diesel engines, as the injectors use a high voltage to
operate, and the SMPS in the management box, can radiate somewhat on HF.
In EMC terms, things don't radiate much (if at all) below 30MHz, but there
again, those test limits are set to protect broadcast signals, not the low
level comms stuff we are interested in.
As has all been discussed at length here and on other lists, take great
care with the DC power feed, and RF grounding. In particular, if you run
the -ve lead for the radio direct from the battery, fuse it! You wouldn't
be the first to melt a radio or accessories when starting the engine if the
normal battery ground strap is anything less than perfect...
Take care..
Dave G0WBX.
------------------------------
Message: 13
Date: Wed, 26 Jul 2006 11:47:34 -0400
From: Bob Burns K4RXR <k4rxr__at_rlburns.net>
Subject: RE: [aprssig] Mounting 2M Xcvr in '05 Toyota Camry
Quoting Robert Bruninga <bruninga_at_usna.edu>:
>I wonder if the ARRL or someone has a WEB page where all
>problems with RFI can be documented so that hams can go
>to one source and see comments from everyone else on
>particular problems.
Not exactly the database you are talking about, but the ARRL does have a
web page where they list the responses they got from various car
manufacturers when surveyed about amateur radio installations and
automotive RFI.
The web page is: http://www.arrl.org/tis/info/carproblems.html
Bob...
------------------------------
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