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PA2AGA > HDDIG 26.09.00 23:42l 196 Lines 7030 Bytes #999 (0) @ EU
BID : HD_2000_263I
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Subj: HamDigitalDigest 2000/263I
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Sent: 000926/2038Z @:PI8HGL.#ZH1.NLD.EU #:18368 [Den Haag] FBB $:HD_2000_263I
From: PA2AGA@PI8HGL.#ZH1.NLD.EU
To : HDDIG@EU
Date: Tue, 26 Sep 00 19:51:40 MET
Message-Id: <hd_2000_263I>
From: pa2aga@pe1mvx.ampr.org
To: hd_broadcast@pa2aga.ampr.org
X-BBS-Msg-Type: B
>
> I think contacting a coordinator was a good suggestion, as they
> will know the unpublished aux links, and help you from causing a
> big stink. Even then I would put a recorder on the freq for a few
> days (I use one of those radio-shack recorders that record when
> the squelch breaks (get to hear the cops for a whole day in 15
> minutes, ha), as there may be an un-coordinated Ham doing their
> thing right smack dab where you want to do your thing.
>
> "Fred Mahone" says:
> > I have not been following the APRS talk close enough to know if there
> > has been any discussion about a dedicated 70cm. APRS frequency.
Note that here in Southern California, the entire 440-450MHz segment, except
for about 4 pairs, are coordinated to repeaters. Out of those 8 frequencies
which are not, only one is allocated to any digital mode (and it is used for
BBS mail forwarding only).
The "socal" digital allocations are at 431 MHz and 439 MHz.
As for antennas, Comet and Diamond do make antennas that are resonant in the
435 MHz range, but one has to order them with a slightly adjusted part number.
Using the normal part number will result in an antenna centered around 445
MHz,
as you found out.
Lastly, although some people may be uncoordinated, I believe you meant to
refer
to an uncoordinated radio operation, not the person, unless you were referring
to a specific situation. ;-)
------------------------------
Date: Mon, 25 Sep 2000 20:01:29 -0500
From: "Steve Sampson \(K5OKC\)" <ssampson@nospam.radio-link.net>
Subject: UHF APRS frequency?
"Dana H. Myers K6JQ" says:
> I tend to suspect almost any location in the United States has local RADAR
> often enough to notice.
I think it's mostly a Navy thing anymore. The USAF has pretty much
abandoned the UHF band for radar, other than some of the missile
detection systems (which I hear have been mothballed mostly). More
likely to find wind profilers from the Weather Service than a pulse radar :-)
I think the E-2 Hawkeye can do 460 MHz, I don't know about lower, but
we hardly see them around here anymore. The nearest radar to me is a
1.2 GHz FAA Long Range Radar (LRR) about 4 miles east, and the rest
are S band around here.
------------------------------
Date: Tue, 26 Sep 2000 01:27:51 -0500
From: "Charles Brabham" <n5pvl@swb.net>
Subject: UHF APRS frequency?
"Steve Sampson (K5OKC)" <ssampson@nospam.radio-link.net> wrote in message
news:ssvtci7qbu2d2d@corp.supernews.com...
> "Dana H. Myers K6JQ" says:
>
> > I tend to suspect almost any location in the United States has local
RADAR
> > often enough to notice.
>
> I think it's mostly a Navy thing anymore. <snip<
For years, the radar planes sent out to interdict drug smugglers have
regularly trashed out the 440 MHz 9.6kb "backbone" links of the TexNet
Packet network, from central Texas, all the way down to the border. (300 mi.
footprint affected) Why the TexNet folks used 440Mhz for their backbone
links in the first place, then continued to put new ones in after this
problem came up is hard to understand. SEDAN does just fine with their
6-meter 9.6kb backbone, with no comparable interference problems. Other nets
do just fine, using the 220 MHz stuff.
--
73 DE Charles Brabham, N5PVL
n5pvl@swbell.net
http://home.swbell.net/n5pvl/
------------------------------
Date: Tue, 26 Sep 2000 07:53:15 GMT
From: horseshoestew@my-deja.com
Subject: UHF APRS frequency?
In article <39CFE155.C15DAA4@Source.Net>,
"Dana H. Myers K6JQ" <Dana@Source.Net> wrote:
> So, in the context of a nationwide APRS context, a single frequency
> makes sense, but there's no reason why regional frequencies could
> be used for sub-sets of the nationwide context.
I agree.
> > It will be harder to standardize on a UHF nationwide frequency,
because
> > there isn't even a single standard UHF 9600bps coordinated frequency
> > yet.
>
> This doesn't make much sense to me. It didn't seem all that easy to
move APRS
> to 144.39MHz just because they'd set up camp elsewhere. So, I tend
to disagree.
>
> > I think the ARRL came up with some "suggested" ones in the early
> > 90's - but they weren't any good for the Southern California area,
> > because of the Pt. Mugu radar problem.
>
> Is APRS really *that* old that the ARRL would have proposed
nationwide frequencies
> in the early 1990s? I think APRS itself was only hatched around
1992. OK, enough
> of the hair-splitting.
I was referring to 9600bps frequencies - this should have been obvious
contextually as well as grammatically.
> Pt. Mugu is only one of many areas in SoCal plaugued by primary users
of the
> UHF band (of which amateurs are secondary users). Edwards AFB and
Palmdale
> Plant 42 frequently encounter RADAR interference - the only thing
that's made
> RADAR interference better is the number of base-closings during the
1990s.
>
> I tend to suspect almost any location in the United States has local
RADAR
> often enough to notice.
The Southern California area is one of a few that was "specifically"
referred to in older editions of the Part 97 FCC rules. There were
others - i.e., there was one area centered in Eastern New Mexico(White
Sands). I think the FCC has deleted many of the specific geographic
references. My FCC manual is old enough that it still has them. In
any event, we are "secondary" on 420-430, and this part of the 70cm
band gets "blasted" in SoCal. I'm sure it gets hit in other parts of
the country as well. My point is - the frequencies that this old ARRL
article tried to coordinate for packet were in this "bad" area. The
net result is that there are NO useful coordinated standard 9600bps or
higher 70cm frequencies in the US. Pretty ridiculous.
By the way, we've standardized on frequencies around 439.000 in SoCal.
I think there were 438.950, 438.975, 439.000, 439.025, 439.050. If you
were getting a TEKK radio crystal cut - 439.025 was your best bet.
> Dana K6JQ
> dana@source.net
> (DM04 from 1990 to 2000, now CM88)
------- Stewart - N0MHS --------
Wireless High-Speed Networking and
Public Radio Services Information(MURS,FRS,GMRS,ARS,CB):
http://www.pubcel.com
Sent via Deja.com http://www.deja.com/
Before you buy.
------------------------------
Date: Mon, 25 Sep 2000 16:12:53 -0400
From: "Timmins" <timmins@penn.NOSPAM.com>
Subject: Wanted - ACARS 900 Software
I found out the name - of the AEA software, that has been discontinued for a
few years (according to the support people at Timewave) . It's called ACARS
900 - this alllows the PK 900 to monitor ACARS....
Anyone have a copy of this they aren't using??
de N3DDY
------------------------------
End of Ham-Digital Digest V2000 #263
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