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To : PSK31@WW.SYD.NSW.AUS.OC
De: Psk31 Digest <owner-psk31@bipt106.bi.ehu.es>
Para: <psk31-digest@bipt106.bi.ehu.es>
Asunto: Psk31 Digest V1 #247
Fecha: miércoles 1 de diciembre de 1999 4:41
Psk31 Digest Wednesday, December 1 1999 Volume 01 : Number 247
In this issue:
RE: [psk31] Ground loops
[psk31] PSK31SBW and DBCS
[psk31] G3KNU & Optocouplers
See the end of the digest for information about psk31-digest
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Date: Tue, 30 Nov 1999 00:53:46 -0600
From: Keith Parris <parrisrk@dallas.net>
Subject: RE: [psk31] Ground loops
By "commercial interfaces" do mean commercial interfaces for applications
other than PSK31?
Keith, WB5RBA
At 09:58 AM 11/29/99 -0500, Charles Greene wrote:
>At 12:05 PM 11/29/99 +0000, Adrian Rawlings wrote:
>>Transformers are one solution. The problem is that they, themselves, can
>>pick up hum.
>>
>>I was wondering about using an Op Amp pre-amp with high-Z differential
>>inputs. The reasoning behind this is that the hum would be a common mode
>>signal and would not, within certain limits, get through.
>>
>>Has anyone been down this road before? Am I missing something?
>Yes, works fine. Some commercial interfaces use an op-amp
>instead of a transformer.
>____________
>
>Try PSK31. Check: http://aintel.bi.ehu.es/psk31.html
> and May 99 QST. K2 S/N 462.
>
>Chas, W1CG
>
>Rhode Island TCPIP Address Coordinator
>w1cg@arrl.net
>_____________
>
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Date: Tue, 30 Nov 1999 15:57:05 +0900
From: Atsushi Nishio <anishio@yamato.ibm.co.jp>
Subject: [psk31] PSK31SBW and DBCS
Hello,
I would like to send/receive DBCS characters on PSK31.
The DBCS is Double Byte Character Sets which are used in JA, HL, BV, BY.
The current PSK31SBW 1.08 can handle 255 characters, so we
can send DBCS(Double Byte Character Sets = AKA Kanji)
via the "File->Send File" menu to other station. But we can not see these DBCS
characters at a receiving time, and by typing a keyboard we can not see the
sent DBCSs on the context area.
On Windows systems(3.1,95,98,NT), a DBCS character is divided into
two WM_CHARs. One is a DBCS 1st byte WM_CHAR, another is a DBCS
2nd byte WM_CHAR. If we want to display the DBCS characters, save the DBCS
1st byte WM_CHAR, get DBCS 2nd WM_CHAR and must do TextOut(length 2)
at one time. G3PLX Peter, would you handle DBCS in your code ? If I can get the
part of the source code, I can explain the DBCS handling to you.
The followings is a pseudo code:
UCHAR DBCS1stByte;
while(1){
GetMessage(WM_CHAR);
if(DBCS1stByte == 0){
if(isDBCS1stByte(WM_CHAR)==TRUE)
// Save the DBCS 1st byte, and do nothing
DBCS1stByte = WM_CHAR;
else
// Display SBCS(English) character
TextOut(WM_CHAR, length 1);
}else{
// DBCS 1st byte had been saved
TextOut(DBCS1stByte+WM_CHAR_2nd, length 2);
DBCS1stByte = 0;
}
}
de 7M4KSC/AC5RX Atsushi Nishio
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Date: Tue, 30 Nov 1999 12:01:01 -0600
From: Bud Patten <bud.patten@worldnet.att.net>
Subject: [psk31] G3KNU & Optocouplers
Peter:
If you want to use an optocoupler for audio, you will have to bias the LED up
to something approaching linear
operation and AC couple the audio into it. The main problem will be
linearity/distortion. I'm sure there are
some devices out there that would pass ac with a reasonable level of distortion
if the input signal is kept
low. Doing this will also considerably increase the level of complexity since
you will now need two isolated
power supplies for the O/C.
Regards,
Bud, w0lcp
bud.patten@worldnet.att.net
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------------------------------
End of Psk31 Digest V1 #247
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