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ZL3AI > APRDIG 13.10.03 06:05l 273 Lines 9265 Bytes #999 (0) @ WW
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Subj: TAPR Digest, Oct 10, 2/4
Path: DB0FHN<DB0RGB<OK0PPL<DB0RES<ON0AR<ZL3VML
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From: ZL3AI@ZL3VML.#80.NZL.OC
To : APRDIG@WW
Subject: Re: Tweak your TNC
From: Wes Johnston <wes@johnston.net>
Date: Fri, 10 Oct 2003 10:44:20 -0400
X-Message-Number: 10
First, I need to say that I referred to my rig last night as a 252, that is
not correct... I have two and got the model numbers confused. The rig all
the testing was done on was a HTX-242.
I realize there are two parts to TXDelay... The most obvious is the time it
takes the PLL on the transmitting rig to shift frequencies, turn on the PA
and stabilize. The second part is the time it takes the receiving station
to sense a signal, open it's squelch and to receive about 50 bits in the
clear for synch.
For all you guys out there who say closed squelch rigs can't receive short
TXDelays....
The neighbor I used to test TXDelay on the 242 rig is running an alinco
dr140 with *closed* squelch. I was able to get in *sometimes* with my TXD
set as low as 40mS against a closed squelch. Maybe tonight I'll have him
switch to open squelch and run the same test again. 70 or 80mS was rock
solid into his rig.
So here's the first entry in the chart...
RADIO SHACK 242 = 80mS txd.
Wes
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Subject: Re: Weather banners for your web pages
From: "Bruce Martin, KQ4TV" <aprssig@almostanywhere.com>
Date: Fri, 10 Oct 2003 10:34:17 -0500
X-Message-Number: 11
This is great Jim. I am already taking advantage of it but I would like
to replace lat & long. with a grid (4 or 6 digit). Can you give an
example with changed lables?
Bruce, KQ4TV
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Subject: WARNING - an OT question about FRS
From: "JBCrafts" <jbcraft@adelphia.net>
Date: Fri, 10 Oct 2003 11:56:40 -0400
X-Message-Number: 12
I know there are FRS users here, so I have a question...
Which brand/model should I get?
I KNOW, this is like asking "Which HF rig should I buy", but I have read
reports that not ALL FRS radios/brands meet specifications for .500W out
and very poor receivers...
One requirement that I have is that it MUST have a drop in charger, and
charge off 12v or less.
I plan to put a couple in the camper and they are going to float on a
charger MOST OF THE TIME.
I am not locked into FRS, I could also use MURS, but they sell FRS
everywhere, even found a bin of them at MicroCenter and a rack of them at
Meijer's (a regional department store).
Suggestions??
Bob K8YS
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Subject: Re: Weather banners for your web pages
From: Dennis Hudson <n2lbt@n2lbt.com>
Date: Fri, 10 Oct 2003 12:00:08 -0400
X-Message-Number: 13
Thanks, I've added it to my page as well. Looks cooler than the weather
underground one I had.
http://www.n2lbt.com/
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Subject: Re: Tweak your TNC
From: "Scott Miller" <scott@opentrac.org>
Date: Fri, 10 Oct 2003 09:04:28 -0700
X-Message-Number: 14
>to sense a signal, open it's squelch and to receive about 50 bits in the
>clear for synch.
Does anyone have stats on various TNCs and how long they take to sync up?
When I was doing some testing with AGWPE, I had an input sample trimmed down
with only a few bits before the start of the frame and it decoded just fine.
Scott
N1VG
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Subject: Re: Tweak your TNC
From: "Phil Pacier, AD6NH" <ad6nh@arrl.net>
Date: Fri, 10 Oct 2003 11:4:5
X-Message-Number: 15
On 10/10/03, "Wes Johnston <wes@johnston.net>" wrote:
>RADIO SHACK 242 = 80mS txd.
ADI AR-146 = 90mS txd.
73
Phil - AD6NH
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Subject: Re: Dwait Hacks kill APRS
From: Henk de Groot <henk.de.groot@hetnet.nl>
Date: Fri, 10 Oct 2003 14:24:19 +0200
X-Message-Number: 16
Hello Tim,
At 18:13 9-10-03 -0500, Tim Cunningham wrote:
>SLOTTIME can only be set as low as 1 on the UIDIGI firmware.
That's close enough I guess. There is some delay between subsequent
transmissions anyway. Even if a digipeater keys its transmitter directly
after the channel becomes free, then it still takes about 100ms or so for
an avarage 2m FM PLL system before the next carrier becomes visible (and
150..300ms before it is stable enough for AFSK data). It will take for sure
more than 10ms. Since after 10ms UIdigi already desides to key the
transmitter, so you will have overlapping transmissions even with a 10ms
SLOTTIME setting.
Kind regards,
Henk.
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Subject: Re: Tweak your TNC
From: Henk de Groot <henk.de.groot@hetnet.nl>
Date: Fri, 10 Oct 2003 14:46:03 +0200
X-Message-Number: 17
Hello Wes,
At 21:00 9-10-03 -0400, Wes Johnston wrote:
>The default was set to 350ms by kantronics, mine _was_ 250ms because I
>figured that was a safe number. Tonight I played "lets see how low we can
>go" and simply kept lowering my txd until I noticed the digi wasn't
>hearing me _reliably_. I noticed that my 100% sucess rate stayed until
>TXD was at or below 70ms. The local digi would copy me 20% of the time
>with txdelay as low as 50ms. I have since set my TXD to 80ms (TXDELAY 8
>in kantronics-speak).
Beware that although the TXD is in 10ms units, the accuracy of the internal
timer might not be, the clock could be 18Hz like for example the standard
PC timer has; that are 55ms steps. If the timer just decrements on every
55ms interrupt, a setting of 80ms may well mean "somewhere between 55ms and
110ms"! The 80ms setting expires after 55ms if the timer is started just
before the timer interrupt occurs, the next timer interrupt will timeout
the 80ms timer about 55ms later. Likewise it is 110ms if the timer is
started just after a timer interrupt occured. It is possible that 80ms
means "at least 80ms" and that 55ms is added to the timer before it is
started compenstate for the accuracy of the internal timer.
I don't know what the internal timer of a Kantronics TNC is, but it is
something to be aware off.
Also be aware that not only your station has to key up and get stable
output, but also that the receiver has sufficient time to synchronise to
your signal. Setting TXDelay too low may cause excellent reception for one
station and poor or no reception for another (and running with closed
squelch makes it worse). I would leave a good margin to keep it reliable
for everybody.
Kind regards,
Henk.
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Subject: Re: Radio
From: Henk de Groot <henk.de.groot@hetnet.nl>
Date: Fri, 10 Oct 2003 15:23:51 +0200
X-Message-Number: 18
At 00:09 10-10-03 -0500, Adi Linden wrote:
>Oops, sorry! This went to the wrong email address. Can you tell? Man, this
>is embarrassing. My apologies.
Don't be embarrassed, it sure looked like it was on topic here too...
Kind regards,
Henk.
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Subject: Re: Tweak your TNC
From: "Matt Werner" <kb0kqa@arrl.net>
Date: Fri, 10 Oct 2003 11:25:53 -0500
X-Message-Number: 19
I have tried this some a while ago with GE Mastr II radios. I found that
the radio has a very fast turn-around - I could get it as low as 50 ms,
although a lot of receivers won't open the squelch that fast (the only way I
got it down to 50 ms was to have the squelch open on the receiving radio).
I think I settled eventually on 70 or 80 ms, as that seemed a good number
for the receivers that were receiving me as well.
My point is that it may not pay to drop below 70 or 80, as some receivers
won't open up that fast.
73 - Matt
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Subject: Re: WARNING - an OT question about FRS
From: Dale Blanchard <wa7ixk@earthlink.net>
Date: Fri, 10 Oct 2003 09:36:50 -0700
X-Message-Number: 20
I personnally think the Motorola is best. They have better audio because
of the voice compander. Available with dual drop in charger. More
money,better radio.
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Subject: TH-D7 Question
From: Adi Linden <adil@adis.on.ca>
Date: Fri, 10 Oct 2003 14:07:04 -0500 (CDT)
X-Message-Number: 21
I understand the TH-D7 can simulataneously receive voice on one VHF
frequency and data on the other frequency. Can the TH-D7 also
automatically beacon on the data frequency while the local repeater is
being monitored on another VHF frequency?
Thanks,
Adi
--
Adi Linden | va3adi | va3adi@adis.ca | http://adis.ca
+-----------------------------------------------------------------+
IRLP Node 2590 in Sioux Lookout, Ontario
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Subject: RE: TH-D7 Question
From: <BobDonnell@arkalmus.com>
Date: Fri, 10 Oct 2003 13:08:23 -0700
X-Message-Number: 22
Yes, it can, though it'll interrupt reception on the other receiver if
the other receiver is set to the same band as the data transmissions.
With APRS transmissions (the only ones a D7 does well at) that's
500-1000 ms - as much as a couple of sylables.
73, Bob, KD7NM
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