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ZL3AI > APRDIG 09.04.07 04:21l 259 Lines 7784 Bytes #999 (0) @ WW
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Subj: [APRSSIG] Vol 34 #5, 1/1
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From: ZL3AI@ZL2BAU.#79.NZL.OC
To : APRDIG@WW
Today's Topics:
1. Re: Deviation meters (Jim Campbell)
2. Re: Deviation meters - Corrected URL For WaveTools download
(Stephen H. Smith)
3. Re: Deviation meters (John)
4. Re: Deviation meters (Ray Wells)
5. Re: Deviation meters (Ray Wells)
6. RE: Deviation meters (Ray McKnight)
----------------------------------------------------------------------
Message: 1
Date: Thu, 05 Apr 2007 13:03:55 -0400
From: Jim Campbell <jim_c_at_bellsouth.net>
Subject: Re: [aprssig] Deviation meters
Stephen,
The URL that you provided didn't work for me. This one did:
http://wa8lmf.net/downloads/index.htm
Tnx es 73,
Jim - W4BQP
Stephen H. Smith wrote:
>johnk.mchugh_at_att.net wrote:
>
>>
>>
>>The Bezzel function for the first carrier null is 2.405. The formula
>>is (Required Dev/ 2.405). So if you want to set the deviation to
>>3.5KHz, use an audio tone of 3.5/2.405 or 1.455KHz. Oh, you don't
>>have a 1.455KHz tone, then use the mark tone from a KAM, usually
>>1600Hz on HF. There must be software that will produce variable audio
>>tones from a sound card, anyone know of such a program?
>>
>>John
>
>
>
>The freeware utility bundle "Wavetools" on my web site downloads page
>will do this.
>
>It bundles 4 applications that use the sound card: an audio function
>generator, an audio level (a.k.a. "V.U.) meter, a dual trace scope and
>an audio spectrum analyzer.
>Go to < http://wa8lmf.com/miscinfo > and look for the file
>"Wavetools.exe" near the bottom of the list.
>
>
>By the way, it's Bessel, not Bezzel. Incidentally, the
>traditional RTTY mark tone of 2125 Hz produces a Bessel null at 5.1
>KHz deviation.
>
>
>--
>
>Stephen H. Smith wa8lmf (at) aol.com
>EchoLink Node: 14400 [Think bottom of the 2M band]
>Home Page: http://wa8lmf.com --OR-- http://wa8lmf.net
------------------------------
Message: 2
Date: Thu, 05 Apr 2007 10:16:07 -0700
From: "Stephen H. Smith" <wa8lmf2_at_aol.com>
Subject: [aprssig] Re: Deviation meters - Corrected URL For WaveTools
download
jim_c_at_bellsouth.net wrote:
>Stephen,
>
>The URL that you provided didn't work for me. This one did:
>
>http://wa8lmf.net/downloads/index.htm
>
>Tnx es 73,
>
>J
OOPS! I accidentally substituted .COM for .NET ! (I have both WA8LMF.COM
and WA8LMF.NET domains registered.)
The correct URL is:
Then look near the bottom of the list for " WAVEtools.EXE ".
--
Stephen H. Smith wa8lmf (at) aol.com
EchoLink Node: 14400 [Think bottom of the 2M band]
Home Page: http://wa8lmf.com --OR-- http://wa8lmf.net
NEW! World Digipeater Map
http://wa8lmf.net/APRSmaps
JavAPRS Filter Port 14580 Guide
http://wa8lmf.net/aprs/JAVaprsFilters.htm
"APRS 101" Explanation of APRS Path Selection & Digipeating
http://wa8lmf.net/DigiPaths
Updated "Rev H" APRS http://wa8lmf.net/aprs
Symbols Set for UI-View,
UIpoint and APRSplus:
------------------------------
Message: 3
Date: Thu, 05 Apr 2007 13:53:51 -0400
From: John <johnk.mchugh_at_att.net>
Subject: Re: [aprssig] Deviation meters
Stephen H. Smith wrote:
>By the way, it's Bessel, not Bezzel.
Thanks Steve, I was thinking of the thing that goes on the front panel.
Thanks for the software download, the audio generator works great.
John
--
John Mc Hugh, K4AG
Coordinator for Amateur Radio
National Hurricane Center, WX4NHC
Home page:- http://www.wx4nhc.org
------------------------------
Message: 4
Date: Fri, 06 Apr 2007 15:17:53 +1000
From: Ray Wells <vk2tv_at_exemail.com.au>
Subject: Re: [aprssig] Deviation meters
Ray McKnight wrote:
>>Like yourself, I have a service monitor, a Motorola R2400, but we're
>>amongst a lucky minority.
>>
>>I think that an oscilloscope is the most useful tool one can have for
>>making audio adjustments, and with software scopes available, such a
>>tool is within the reach of most.
>>
>>Ray vk2tv
>>
>
>The sad reality is that 90% of US Hams are not accessing APRS
>Via RF, but the Innerdnet. Yes, simple basic test equipment is
>Useful for setting things like deviation. Most Hamfests *used*
>To have test benches set up to do stuff like that.
>
>In the US, the vast majority of APRS Hams are No-Code Technician's,
>And the use of o-scopes and service monitors is well beyond their
>Level of skill. If they won't invest in a VHF radio/TNC, why bother
>With test equipment?
>
>Sadly, 99.9% of Hams are more concerned with the number of minutes
>In their cell phone plan, not their deviation on APRS. Find a way
>To make their cell phone work better and they'll pay attention.
>
>This is why not a single solitary APRS message was sent from
>Downtown New Orleans over the sole surviving Digi during the
>Aftermath of Hurricane Katrina. And that Digi was up at like
>550ft!
>
>So as an Emergency Service, Amateur Radio might as well
>Be a drum and smoke signals...
If I had not worked in the two-way radio repair industry for thirty years,
the last thirteen for myself, I probably would not have test equipment. My
eyes prevent me from doing commercial repairs anymore but I kept one
service monitor plus the CRO and other assorted small items to allow me to
repair and align my own amateur equipment.
I have one user on VHF on my packet bbs, and that same user is also the
only other APRS user in these parts. However, I'm not going to let that be
a disincentive to me installing an APRS digi to cover part of the most
significant highway in this country - that's country, not county! If the
digi does nothing else it will be available for travellers passing through.
I'm also going to put in a 30m HFgate because there's a shortage of those
around VK.
My hope is that by providing facilities, rather than joining the crumble of
AR, it may promote a bit more activity. Amateurs can't use facilities if
they don't exist. Futile? Maybe, but nothing ventured, nothing gained.
Ray vk2tv
------------------------------
Message: 5
Date: Fri, 06 Apr 2007 15:26:47 +1000
From: Ray Wells <vk2tv_at_exemail.com.au>
Subject: Re: [aprssig] Deviation meters
Stephen H. Smith wrote:
>johnk.mchugh_at_att.net wrote:
>>
>>The Bezzel function for the first carrier null is 2.405. The formula
>>is (Required Dev/ 2.405). So if you want to set the deviation to
>>3.5KHz, use an audio tone of 3.5/2.405 or 1.455KHz. Oh, you don't
>>have a 1.455KHz tone, then use the mark tone from a KAM, usually
>>1600Hz on HF. There must be software that will produce variable audio
>>tones from a sound card, anyone know of such a program?
>>
>>John
>
>The freeware utility bundle "Wavetools" on my web site downloads page
>will do this.
>
>It bundles 4 applications that use the sound card: an audio function
>generator, an audio level (a.k.a. "V.U.) meter, a dual trace scope and
>an audio spectrum analyzer.
>Go to < http://wa8lmf.com/miscinfo > and look for the file
>"Wavetools.exe" near the bottom of the list.
Those tools work extremely well - love the VU meter.
Thanks, Steven, for putting them there for download.
Ray vk2tv
------------------------------
Message: 6
Date: Fri, 6 Apr 2007 00:38:50 -0700
From: "Ray McKnight" <shortsheep_at_worldnet.att.net>
Subject: RE: [aprssig] Deviation meters
YES! And you must find ways to disseminate that info to others, so
travelers will know they exist. The one thing I *loved* about the USA
repeater network was the publication of a small, pocket-sized directory
every year you could carry in your car to quickly reference repeater
locations, sorted by state, town and frequency.
HEY - WHY ISN'T APRS INCLUDED???
ARRL - DUH???
BROADCAST APRS OBJECTS TO SHOW ASSETS!
------------------------------
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