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EB2DVY > PSK31 26.07.99 22:55l 342 Lines 12537 Bytes #-9954 (0) @ WW.SYD.NSW
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To : PSK31@WW.SYD.NSW.AUS.OC
De: Psk31 Digest <owner-psk31@aintel.bi.ehu.es>
Para: <psk31-digest@aintel.bi.ehu.es>
Asunto: Psk31 Digest V1 #118
Fecha: miércoles 21 de julio de 1999 4:26
Psk31 Digest Wednesday, July 21 1999 Volume 01 : Number 118
In this issue:
[psk31] Fw: why not pactor-2 on ur URL ???
[psk31] MixW32 and RTTY
Re: [psk31] MixW32 and RTTY
[psk31] Mix32 Auto freqency shift adjustment??
[psk31] Hellschrieber Software
Re: [psk31] MixW32 and RTTY
Re: [psk31] PSK Overdrive
Re: [psk31] PSK Overdrive
[psk31] RF suppression
Re: [psk31] PSK Overdrive
See the end of the digest for information about psk31-digest
----------------------------------------------------------------------
Date: Mon, 19 Jul 1999 22:32:30 -0400
From: "mills-owen" <mills-owen@email.msn.com>
Subject: [psk31] Fw: why not pactor-2 on ur URL ???
Hello PSKer's,
I recently received this e-mail off a ham who read my web page at
http://www.qsl.net/wm2u and hey! I have never used pactor-2. Can anybody
comment on the Pactor-2 vis PSK31 attributes so I can answer this?
Many thanks in advance, 73 Ernie
Ernest Mills
ICQ #3948450
http://www.qsl.net/wm2u
http://www.n2ty.org
- ----- Original Message -----
From: Alf <kruse@gsf.de>
To: <wm2u@qsl.net>
Sent: Monday, July 19, 1999 6:02 AM
Subject: why not pactor-2 on ur URL ???
> HI dr OM ,
> why we never find Infos abt pactor-2 ???
> one of the best digital HF sytem in the world ????
>
> in comparison to PSk31 : dit u not know that the pactor-2 controller
> has implemanded already since 1995 a better PSK -mode called :
> PSK100 to 800 with a lot of FEC softswiches ... make its much more
> errorfree then psk31
> 2. Pactor-2 works dwn to -18db in to the noise [4kc]
>
> Why u "forget" in ur page this UFB Digital-system ????
> maybe because it is developed in Germany ???
> vy strainged to see that all US Modems are on ur page only ...
>
> 73 Alfred
>
>
>
------------------------------
Date: Mon, 19 Jul 1999 23:40:21 -0400
From: "Andrew J. O'Brien" <obrienaj@netsync.net>
Subject: [psk31] MixW32 and RTTY
I have been using my rig in USB mode while using the MIXW32 software with my
soundcard. Works fine. Today a RTTY veteran said (via Email) that the
convention is LSB for RTTY and he is surprise I tuned anyone in.
The MIX32 help file said use USB, and one needs to check the INVERT box in
MIX32 if using the FSK or LSB settings on my rig.
So, the question is...IF LSB is the normal setting why does MIX32 require
the INVERT to be checked except for USB? Shouldn't it be the other way
round?
Just wondering.
Andy.
------------------------------
Date: Tue, 20 Jul 1999 09:51:33 +0200
From: "Kjell W. Strom" <strom@lime.demon.nl>
Subject: Re: [psk31] MixW32 and RTTY
Andy,
Don't worry, the only universal standard is that MARK is the HIGHER RF FREQUENCY
and SPACE is 170-200 Hz LOWER. It does not matter how you arrive at this
relation. When amateur RTTY started there were no LSB and USB buttons on the
radios and the RTTY signals were generated by shifting the frequency of the VFO
on the transmitter. Still it worked!
The one thing to remember when using AFSK is that LSB is inverting the relation
between MARK and SPACE, so that the MARK AF TONE sent over LSB must be LOWER
than the SPACE AF TONE.
PSK31 has no "polarity", so there is does not matter if you are usin LSB or USB
in that mode, but for QPSK it does matter. If one station is using G3PLX
SoundBlaster software on LSB and the other is using the same on USB, one of the
two must use the inverted QPSK setting.
73
"Kel"
__________________________________________________
Kjell W. Strom, LIME Consulting, SM6CPI - PB3SM
P.O.Box 597, NL-2130 AN Hoofddorp, The Netherlands
Fax & Phone: +31-252-412 736, GSM +31-653-870 195
------------------------------
Date: Tue, 20 Jul 1999 19:57:46 +1000
From: Steve & Debbie Leatheam <sleatheam@mis.net.au>
Subject: [psk31] Mix32 Auto freqency shift adjustment??
Can anybody tell me if Mix32 has an auto frequency shift adjustment facility in the RTTY mode that can be initiated...Most stations these days due to the nature of the software they are using do not use exactly 170hz shift.. RITTY (bless it's departed soul) did have this and was a very useful feature.
Regards,
Steve Leatheam
M.T.E.T.I.A. VK2BGL
http://www.mis.net.au/leatheam
sleatheam@mis.net.au
ICQ: 16710195
------------------------------
Date: Tue, 20 Jul 1999 10:14:22 -0400
From: Vince <wa2rsx@worldnet.att.net>
Subject: [psk31] Hellschrieber Software
FYI, visit the URL given below.
See ya in HELLschrieber !
73s AND, Have Fun out there !
~Vince~
Nino Porcino wrote:
> From: "Nino Porcino" <ninopo@tin.it>
>
> Hello folks,
>
> the new V2.1 release of the Hellschreiber program is available for download
> at: http://ninopo.freeweb.org
>
------------------------------
Date: Tue, 20 Jul 1999 15:35:20 -0400
From: Charles Greene <cgreene@loa.com>
Subject: Re: [psk31] MixW32 and RTTY
HI Andy,
MixW32 does not require you to set invert for LSB, for psk31. It
does require you to set invert for qpsk31. These same conventions
also apply to PSK31SBW. I know, because I use LSB all the time.
The reason I use LSB instead of USB is because the filters in
my receiver are set up for digital modes using LSB instead of
USB. If I use USB, I cannot use both of my 250 Hz filters,
and it requires large offset tuning to use a single 500Hz
or 250Hz filter in USB. My transceiver is a Ten Tec Omni VI.
However, I do not know how Nick set up RTTY for mark and
space tones. He could have set it up so that USB gives
the right "polarity" for mark and space tones, in which case
you would have to use invert for the right "polarity" for the
tones if you used LSB. My advice is find out which works
correctly for you and then use that setup.
____________
Try PSK31.
Chas, W1CG
Rhode Island TCPIP Address Coordinator
w1cg@arrl.net
_____________
------------------------------
Date: Mon, 19 Jul 1999 18:59:30 +0000
From: Peter Martinez <Peter.Martinez@btinternet.com>
Subject: Re: [psk31] PSK Overdrive
From Peter Martinez G3PLX
Overdrive of the transmitter audio input is the number one problem
for newcomers on PSk31. It's not just the Mike input that gets
overdriven - it's not difficult to overdrive the phone-patch input either.
But the number two problem is RF feedback, and it might be this that
WB4YDY is experiencing. Soundcards are not designed for amateur
radio, and can suffer from high levels of RF, usually getting into
the card via the audio input and/or output cables from the
transceiver. The high level of RF causes non-linear rectification in
the soundcard circuitry, and the envelope of the rectified RF gets
fed, as audio, to the transmitter again. This creates a loop which
can result in a parasitic oscillation on the audio output of the
soundcard, and hence also on the transmitter output. It usually takes
the form of an extra tone that is exactly one-half of the wanted
output audio. Thus, if the soundcard is outputting 1000Hz, the
spurious is 500Hz and just sounds like an added richness to the
sound. Alternatively the feedback may just create a jumble of noise.
The way to check if you have RF feedback is to listen to the
soundcard output as you are transmitting, not by turning up the
speakers (which may not be sufferring) but by connecting headphones
across the line to the transmitter. First listen with the transmitter
NOT radiating, then see if there's any 'added richness' in the sound
as you switch the transmitter on and wind up the power. You may find,
if there is RF feedback, that at a certain power level, there is a
sudden change in the sound as the parasitic oscillation starts.
Another way to detect RF feedback is if you have an old wavemeter
with a headphone socket, intended originally for checking the audio
of an AM transmitter. Alternatively you can make one yourself with
just a pair of headphones and a single diode. The idea is simply to
detect any amplitude modulation on the transmitter output. A clean
transmission will give no sound at all (no amplitude modulation) when
radiating a 'tune' carrier, and a very low-frequency buzz (31.25Hz)
when idling. RF feedback will give you a tone in the headphones which
starts suddenly as you wind up the power past the critical
parasitic-oscillation point.
The cure is almost always to stop the RF getting down the audio cable
from the transmitter to the sound card. Ferrite rings, with both the
audio input and audio output wrapped together through the ring as
many times as you can, will usually fix it. It's possible that the
PTT cable from the transmitter to the COM port might need treating in
the same way.
73
Peter
------------------------------
Date: Tue, 20 Jul 1999 15:26:24 -0500
From: Ken <kg0wx@swbell.net>
Subject: Re: [psk31] PSK Overdrive
Peter Martinez wrote:
<snip>
>
> The cure is almost always to stop the RF getting down the audio cable
> from the transmitter to the sound card. Ferrite rings, with both the
> audio input and audio output wrapped together through the ring as
> many times as you can, will usually fix it. It's possible that the
> PTT cable from the transmitter to the COM port might need treating in
> the same way.
>
> 73
> Peter
Hey Peter what do you think about the 100 uh inline chokes that radio
shack sells? Could you use them instead of the wrap around devices?
For a picture, see the RS 1999 cat page 181 item 5 (273-102).
Also, does it make a difference where a choke is mounted on the cable?
Should I mount them at the soundcard or the radio end?
73's Ken
------------------------------
Date: Tue, 20 Jul 1999 18:23:06 -0500
From: Elaine and Ronald Waxman <erwax@interaccess.com>
Subject: [psk31] RF suppression
Using a "choke" (inductor) is problematical. This component
is designed, ordinarily, to be energy efficient. Hence it
doesn't absorb much of the RF you want to suppress. So it
may or may not decrease the amount of RF arriving at the
sound card. The effect of the load impedance of the sound
card needs to be taken into effect.
Some RF may be the result of "common mode" signals. A
ferrite core with both wires passing through it will
suppress "common mode" conduction. A ferrite core on each
signal wire will suppress differential mode conduction
(Signal measured across the input wire pair).
Be sure the ferrite core is made up of the proper material
for the frequency range and it's intended use.
Ferrite's are designed especially for this task. They have
good permeability and high loss, which is key to this
application.
A ground loop is created when the ground connection from
individual equipment is connected to more than one common
point. An example would be when the xcvr and PC are
connected to a power ground and to each other through an
audio connection. A transformer will solve this problem at
least at low frequencies. However take care to be sure that
the two grounds (XCVR and PC) are isolated from each other
and connect only to the primary and secondary of the
transformer. The transformer will not be an effective common
mode isolator especially at high frequency unless it has a
faraday shield. On the other hand at high frequency the loss
of the core will absorb a great deal of the energy. At 50 or
60 Hz. the common mode could be a problem. If, after
connecting the transformer properly, hum is detected
investigation of the common mode coupling of the transformer
might bear scrutiny.
Ron
de W9KNB
------------------------------
Date: Tue, 20 Jul 1999 17:53:10 -0600
From: "Bill Bierly" <bbierly@access1.net>
Subject: Re: [psk31] PSK Overdrive
I have a RF problem in my cables. It is only on frequencies around 3.2mhz
(Mars freq). When I transmit running 50 to 100 watts IT really blasts my
speakers. I don't have to be operating PSK31, it does it regardless of what
the computer is doing, it only has to be on and the speaker power is on or
off.
The first time this happened I was sure I blew the speaker cones but they
are ok. I have some of the Radio Shack clamp on ferrite's plus a ring with
a few turns and it is still there. I am using RG-174 coax for the sound
card cables with the 1:1 transformers with a connector in to the box. I try
to remember to disconnect it when operating around that frequency. The
cables are approximately 6ft long.
Bill
------------------------------
End of Psk31 Digest V1 #118
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