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ZL3AI > APRDIG 30.10.06 21:45l 262 Lines 7636 Bytes #999 (0) @ WW
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Subj: [APRSSIG] Vol 28 #27, 1/1
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From: ZL3AI@ZL2BAU.#87.NZL.OC
To : APRDIG@WW
Today's Topics:
1. RE: PHG calculation formula? (Dave Baxter)
2. Source for VHF Txcvr board (Peter Devanney)
3. Re: PHG calculation formula? (Gregg Wonderly)
4. RE: PHG calculation formula? (scott_at_opentrac.org)
5. RE: Source for VHF Txcvr board (scott_at_opentrac.org)
6. RE: Source for VHF Txcvr board (tprinty)
7. Re: PHG calculation formula? (Jason Winningham)
8. RE: PHG calculation formula? (scott_at_opentrac.org)
9. KENWOOD TM D700A TNC SET UP (julien mervyn dedier)
----------------------------------------------------------------------
Message: 1
Date: Fri, 27 Oct 2006 09:21:45 +0100
From: "Dave Baxter" <dave_at_emv.co.uk>
Subject: RE: [aprssig] PHG calculation formula?
OK...
Typical impenetrable C gibberish again. As usual, without the details of
the library used, one has no idea whatsoever what the function does. What's
wrong with the ^ character in any case I wonder, and why it's not used to
designate raise to a power, like just about every other programming
language.
I wouldn't have had to ask the question if someone had posted the actual
math functions of course, or said what environment and library was used.
Cheers Steve.
Alan. Thanks for the snippet of Bob's site, still cant get to it from
here, if you mess on any of the DNS manipulation websites, I can find
many potential addresses for that, but like the one often posted, I
can't get into it. It may be a local problem here of course, but
sitting behind a proxy, not a lot I can do about it.
Thanks..
Dave G0WBX.
>On 10/26/06 5:17 AM, Dave Baxter wrote:
>>OK, so what exactly do you do with...
>>power = pow(base_power, 2.00)
>>Comma 2.00? Is there a function designator missing
>somewhere, as that
>>looks like you're calling a function "pow" with two indipendant
>>values, "base_power" and the value of 2.
>
>You are:
>
>POW(3) BSD Library Functions Manual
>POW(3)
>
>NAME
>pow -- power function
>
>SYNOPSIS
>#include <math.h>
>
>double
>pow(double x, double y);
>
>long double
>powl(long double x, long double y);
>
>float
>powf(float x, float y);
>
>DESCRIPTION
>The pow() functions compute x raised to the power y.
------------------------------
Message: 2
Date: Fri, 27 Oct 2006 06:38:31 -0400
From: "Peter Devanney" <pdevanney_at_rogers.com>
Subject: [aprssig] Source for VHF Txcvr board
I am looking for a small VHF transceiver (Po in the 2-5 Watt range ) board
to integrate with a TT3 or OT in as small a form as possible.
Any information on a source for these appreciated?
73
Peter
VA3YOW
------------------------------
Message: 3
Date: Fri, 27 Oct 2006 08:34:48 -0500
From: Gregg Wonderly <gregg_at_wonderly.org>
Subject: Re: [aprssig] PHG calculation formula?
Dave Baxter wrote:
>Typical impenetrable C gibberish again. As usual, without the details
>of the library used, one has no idea whatsoever what the function does.
>What's wrong with the ^ character in any case I wonder, and why it's not
>used to designate raise to a power, like just about every other
>programming language.
In C, ^ is exclusive-or...
Gregg Wonderly
W5GGW
------------------------------
Message: 4
Date: Fri, 27 Oct 2006 07:01:36 -0700
From: <scott_at_opentrac.org>
Subject: RE: [aprssig] PHG calculation formula?
>In C, ^ is exclusive-or...
And in the .NET CLR, Microsoft has overloaded it to mean a pointer to an
object on the managed heap. I'm really starting to hate their stupid
'language extensions'.
I thought the pow() manpage was pretty clear...
"The pow() functions compute x raised to the power y."
So pow(x, y) returns x ^ y. Exponentiation just isn't one of the basic math
operators built into the language.
Scott
N1VG
------------------------------
Message: 5
Date: Fri, 27 Oct 2006 07:09:19 -0700
From: <scott_at_opentrac.org>
Subject: RE: [aprssig] Source for VHF Txcvr board
Got a 6-watt transceiver about the size of a pack of cigarettes sitting on
my desk here. No tracker in it yet, but I'm laying out a Tracker2 board for
it. The RF board alone (no tracker or enclosure) is more expensive than a
ham monoband HT. More expensive than a lot of mobiles, in fact. It's a
nice unit, though - frequency agile, with coverage from 136 to 162 MHz.
Very fast TX and RX. Give me a few weeks and maybe I'll have some beta
units available.
Scott
N1VG
------------------------------
Message: 6
Date: Fri, 27 Oct 2006 11:04:12 -0500
From: tprinty <tprinty_at_mail.edisonave.net>
Subject: RE: [aprssig] Source for VHF Txcvr board
When you get the Beta units running let me know I would be interested in
purchasing one.
Thanks
-Tom
>Got a 6-watt transceiver about the size of a pack of cigarettes sitting
>on my desk here. No tracker in it yet, but I'm laying out a Tracker2
>board for it. The RF board alone (no tracker or enclosure) is more
>expensive than a ham monoband HT. More expensive than a lot of
>mobiles, in fact. It's a nice unit, though - frequency agile, with
>coverage from 136 to 162 MHz. Very fast TX and RX. Give me a few
>weeks and maybe I'll have some beta units available. Scott N1VG
------------------------------
Message: 7
Date: Fri, 27 Oct 2006 11:02:19 -0500
From: Jason Winningham <jdw_at_eng.uah.edu>
Subject: Re: [aprssig] PHG calculation formula?
On Oct 27, 2006, at 9:01 AM, <scott_at_opentrac.org>
>So pow(x, y) returns x ^ y. Exponentiation just isn't one of the
>basic math operators built into the language.
.... and that's most likely because it isn't one of the operators typically
built into hardware.
-Jason
kg4wsv
------------------------------
Message: 8
Date: Fri, 27 Oct 2006 09:16:03 -0700
From: <scott_at_opentrac.org>
Subject: RE: [aprssig] PHG calculation formula?
>... and that's most likely because it isn't one of the operators
>typically built into hardware.
I consider myself lucky that I have an integer multiplier available in the
chips I use! It'd be harder to do PSK31 (or audio level control for AFSK)
without it.
The use of exponents in several portions of the APRS spec shows that it
really wasn't designed with embedded hardware in mind. A calculation that
might be trivial in BASIC on a PC can eat up a large chunk of your code
space on a chip with no native floating point support, using the standard
libraries.
Though I suppose it's not as much of a pain as Garmin's
position/velocity/time format, with the trig required to convert x/y
velocities to course/speed. It DOES give you a z (vertical) velocity
component, though - I'm thinking about using that to get a climb rate
indication on my upcoming balloon launch.
Speaking of which, anyone who wants to join us on the morning of Nov. 11 at
Red Rock Canyon State Park in the Mojave desert is welcome to. We could
use more chasers.
Scott
N1VG
------------------------------
Message: 9
Date: Fri, 27 Oct 2006 12:21:16 -0400
From: "julien mervyn dedier" <julien9z4fz_at_gmail.com>
Subject: [aprssig] KENWOOD TM D700A TNC SET UP
Hi any one in the group have or know where the tnc parameters to be change
or are they to remain as is in the Kenwood tm-d700 radio.
I wan to fully maximize on the use of the radio i know tnc set may vary from
person base on what one is wanting to do,for both packet and aprs i want to
ensure that i have done the changes right in the tnc if any is to be done at
all
Thanks
Julien
9z4fz
--
THANKS
JULIEN
9Z4FZ//TRINIDSA & TOBAGO.
M0JDD//UNITED KINGDOM.
M0JDD/J3//GRENADA.
------------------------------
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