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PA2AGA > HDDIG 17.07.00 16:05l 181 Lines 6363 Bytes #-9395 (0) @ EU
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Date: Mon, 17 Jul 00 01:30:35 MET
Message-Id: <hd_2000_190A>
From: pa2aga@pe1mvx.ampr.org
To: hd_broadcast@pa2aga.ampr.org
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Ham-Digital Digest Sat, 15 Jul 2000 Volume 2000 : Issue 190
Today's Topics:
12 Khz digital IF filter (2 msgs)
BASIC ham software?
CW versus hi speed digital etc. (2 msgs)
Forget HF & CW - Think Digital (7 msgs)
Help - Naval Academy ham radio club in danger! (2 msgs)
psk31 and vox (4 msgs)
vend sur place
Voice Recogition & PSK
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We trust that readers are intelligent enough to realize that all text
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policies or positions of any party. Your mileage may vary. So there.
Loop-Detect: Ham-Digital:2000/190
----------------------------------------------------------------------
Date: Sat, 15 Jul 2000 01:53:53 GMT
From: sdeyoreo@my-deja.com
Subject: 12 Khz digital IF filter
I'm looking for a program that can do IF filtering at 12 Khz. I can do the
math for the filter, but I need a program I can use or edit that can fill a
buffer full of soundcard samples, and also output a buffer full of samples to
the loudspeakers. Any help? Ultimaly, I'ld like to do a PC radio with all IF
and AF done in the computer with a DDS for local osc.
Sent via Deja.com http://www.deja.com/
Before you buy.
------------------------------
Date: Sat, 15 Jul 2000 07:04:54 GMT
From: nomail@rob.knoware.nl (Rob Janssen)
Subject: 12 Khz digital IF filter
sdeyoreo@my-deja.com <sdeyoreo@my-deja.com> wrote:
>I'm looking for a program that can do IF filtering at 12 Khz. I can do the
>math for the filter, but I need a program I can use or edit that can fill a
>buffer full of soundcard samples, and also output a buffer full of samples to
>the loudspeakers. Any help? Ultimaly, I'ld like to do a PC radio with all IF
>and AF done in the computer with a DDS for local osc.
What you are looking for is not "a program", but the API (application
program interface) to the sound system in your computer.
It is made available by the operating system, when that supports sound.
Documentation is usually found at the site of the company or group
supporting your operating system.
Rob
--
+----------------------------------+--------------------------------------+
| Rob Janssen pe1chl@amsat.org | WWW: http://www.knoware.nl/users/rob |
| AMPRnet: rob@pe1chl.ampr.org | AX.25 BBS: PE1CHL@PI8WNO.#UTR.NLD.EU |
+----------------------------------+--------------------------------------+
------------------------------
Date: Fri, 14 Jul 2000 17:05:38 -0500
From: "Jim" <jim@taborsoft.com>
Subject: BASIC ham software?
Howdy,
Try the ARRL Operating Manual. Last one I saw had quite a bit of code in
basic.
Regards,
Jim
--
http://www.taborsoft.com
Communications Analysis Prediction Wizard
CAPMan HF Propagation Prediction & System Analysis Software
Will <wcwhite@mindspring.com> wrote in message
news:396CC9C6.9FB9271A@mindspring.com...
> I want to find BASIC programs for ham radio use. I need these in text
> form, for input into Chipmink Basic for Macintosh. Anyone know any
> websites that may have some of these? Thanks.
>
> de Will KD7BFX
------------------------------
Date: Fri, 14 Jul 2000 18:41:09 -0400
From: "Ed Hare, W1RFI" <w1rfi@arrl.net>
Subject: CW versus hi speed digital etc.
Klein Gilhousen <kleing@NOSPAMqualcomm.com> wrote:
> In principal, OOK (CW) ought to be poorer in performance than PSK in a
> Gaussian channel by a few dB. But we have anecdotes claiming that
> human operators can match the performance of some of the digital
> modes.
Actually, most of the anecdotes about human ability to copy CW signals "10
dB below the noise" are referring to the ability to copy a slow OOK CW 10 dB
below the noise *in a 2000 or perhaps 500 Hz bandwidth." If the necessary
BW of a slow OOK CW signal is 50 Hz, I don't think that that many (or any?)
of these operators could copy a signal that is 10 dB below the noise in the
necessary bandwidth of 50 Hz. Yet some of the digital systems can manage
that, no?
73, Ed Hare, W1RFI
------------------------------
Date: Fri, 14 Jul 2000 23:10:49 GMT
From: kleing@NOSPAMqualcomm.com (Klein Gilhousen)
Subject: CW versus hi speed digital etc.
On Fri, 14 Jul 2000 18:41:09 -0400, "Ed Hare, W1RFI" <w1rfi@arrl.net>
wrote:
>Klein Gilhousen <kleing@NOSPAMqualcomm.com> wrote:
>
>> In principal, OOK (CW) ought to be poorer in performance than PSK in a
>> Gaussian channel by a few dB. But we have anecdotes claiming that
>> human operators can match the performance of some of the digital
>> modes.
>
>Actually, most of the anecdotes about human ability to copy CW signals "10
>dB below the noise" are referring to the ability to copy a slow OOK CW 10 dB
>below the noise *in a 2000 or perhaps 500 Hz bandwidth." If the necessary
>BW of a slow OOK CW signal is 50 Hz, I don't think that that many (or any?)
>of these operators could copy a signal that is 10 dB below the noise in the
>necessary bandwidth of 50 Hz. Yet some of the digital systems can manage
>that, no?
>
>73, Ed Hare, W1RFI
>
Right. In my case, when I listen to a weak CW signal, I don't see
much difference between the 2K filter and the 500 Hz filter in the
absense of interference. But then, I am not one of those "skilled
operators." I think the human ear and brain probably has the ability
to do a certain amount of band pass filtering.
In any case, for an optimal implementation, OOK is worse the PSK but
not all that much.
Klein, WT6G
------------------------------
Date: Fri, 14 Jul 2000 06:25:28 -0500
From: "Steve Sampson" <ssampson@usa-site.net>
Subject: Forget HF & CW - Think Digital
"Paul Keinanen" wrote
>
> <8 km link>
>
> >I think the maximum range at my antenna altitude is 12 km.
>
> >1.6 Mbps at 500 mW.
To be continued in digest: hd_2000_190B
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