For information, to avoid looking for a non-issued program.
73
Patrick
----- Original Message -----
From: Patrick Lindecker
To: [EMAIL PROTECTED]
Sent: Saturday, July 22, 2006 6:19 PM
Subject: Re: [multipsk] MULTIDEM 1.0 ?
Hello Andy,
>Does anyone have a URL for Patrick's MULTIDEM 1.0? I did not see it
>at his web site.
It is not yet on my WEB site as it is already under test.
I send you directly the ZIP application (in the test version state).
For information, hereafter is the description of the program.
In abstract, it permits, from a DSB receiver, to demodulate a transmission
selected on a waterfall through a computerized tuning, with possibility to
decode it through Multipsk.
73
Patrick
This program ("freeware") permits to:
- extract any USB or LSB transmission present in the AF band of a direct
conversion receiver, up to 20 Khz,
- to reverse, if necessary, the direction of reception (USB<>LSB),
- to band-pass filter the received signal,
- afterwards, to forward it to amplified loudspeakers and to Multipsk (for
decoding) through a TCP/IP link.
For this, the program manages the PC sound card, the card being linked to a
direct conversion receiver thanks to a cable connected to the AF output of the
DSB receiver and to the Microphone in connector of the sound card.
Note: this software can be associated to any DSB receiver if its AF output is
either not filtered or lowpass filtered at 20 Khz (and not 3 Khz, as usual).
This software digitizes (to 44100 samples/sec, 16 bits) the signal coming from
the DSB receiver, gives the possibility to select a signal on the waterfall and
demodulates this signal for a USB or LSB reception according to the
transmission to receive (CW in USB, digital in USB, phone in LSB). The AF
signal resulting from this demodulation is decimed (to 11025 samples/sec, 16
bits), band-pass (200-3300 Hz for example) filtered, before being forwarded
under two possible forms:
- acoustic by directing the signal to the sound-card output,
- digital by directing the signal to the Multipsk software, the transmission
protocol being TCP/IP type, as described hereafter.
TCP/IP protocol between MULTIDEM and MULTIPSK: each sample is sent as a byte (8
bits). The bytes transmission is done through the port 3020 and the host adress
127.0.0.1. The bytes transmission frequency is equal to 11025 per second. There
is no control from Multipsk. It is better to send data by group (200 bytes per
group, for example) to avoid a CPU saturation. This protocol is free: other
software than Multipsk could use this protocol to receive samples coming from
MULTIDEM. For the TCP/IP link, one could take inspiration from the
"Multipsk_client" software availlable (source and .EXE) on the author's site:
http://f6cte.free.fr
IMPORTANT: in a DSB receiver, the user can't know without going into the
subject if he is listening a USB or a LSB transmission because, in this type of
receiver, there is a folding of the negative frequencies on the positive
frequencies around the reception frequency.
----- Original Message -----
From: Andrew O'Brien
To: [email protected] ; [EMAIL PROTECTED]
Sent: Saturday, July 22, 2006 4:33 PM
Subject: [multipsk] MULTIDEM 1.0 ?
Does anyone have a URL for Patrick's MULTIDEM 1.0? I did not see it
at his web site.
--
Andy K3UK
Fredonia, New York.
Skype Me : callto://andyobrien73
Also available via Echolink
[Non-text portions of this message have been removed]
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