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De: Psk31 Digest <owner-psk31@aintel.bi.ehu.es>
Para: <psk31-digest@bipt106.bi.ehu.es>
Asunto: Psk31 Digest V1 #374
Fecha: martes 25 de abril de 2000 11:38
Psk31 Digest Tuesday, April 25 2000 Volume 01 : Number 374
In this issue:
[psk31] PSK31 bandplans again.
Re: [psk31] Small gun, better aim
Re: [psk31] Small gun, better aim
[psk31] psk31 and icom 735
Re: [psk31] new to list and need help
[psk31] FT-890 help
Re: [psk31] Small gun, better aim
RE: [psk31] Small gun, better aim
Re: [psk31] Small gun, better aim
[psk31] RE: Amplifiers
Re: [psk31] RE: Amplifiers
Re: [psk31] RE: Amplifiers
[psk31] filters
Re: [psk31] filters
See the end of the digest for information about psk31-digest
----------------------------------------------------------------------
Date: Sun, 23 Apr 2000 19:29:09 +0000
From: Peter Martinez <Peter.Martinez@btinternet.com>
Subject: [psk31] PSK31 bandplans again.
From G3PLX
This subject comes up again and again. 14070-14080 is NOT allocated
to Pactor/Amtor etc. either in Australia or anywhere else. There has
been talk by the PACTOR mailbox operators of a "gentleman's
agreement", but no-one has ever seen a copy of it or identified the
gentlemen who signed it.
The real problem is that the PACTOR stations do not listen before
transmitting and therefore are completely incompatible with
one-to-one RTTY (and I include PSK31) operations where
listening-before-transmitting is well-established practice.
This incompatibility has long been recognised by the IARU, and a note
to the 20m bandplan recommends operation which doesn't listen before
transmitting to take place in the top half of the RTTY band, that is,
between 14089 and 14112 (with a gap for the beacons). The Packet
operators have always respected this. The FCC, a few years ago,
strengthened this principle further by ruling that mailboxes which
transmit without warning should operate in a sub-section of the top
of the RTTY bands. Unfortunately an escape clause got into the rule
and all PACTOR activity has "escaped" through the loophole which
permitted narrow-band mailboxes which "respond to calls" to operate
anywhere. Unfortunately the interference caused to live operators by
narrow-band respond-only mailboxes is still severe.
There is still a strong principle that unattended operation of
digital stations should take place in the top half of the 20m RTTY
band. The fact that PACTOR mailboxes use 14070-14080 means that
THREE-QUARTERS of the RTTY band is used by unattended mailboxes.
I have written to QST proposing that the FCC rule which constrains
mailboxes up at the top end should be strengthened. Not just to
constrain ALL unattended operation above 14089, but to actually
recognise for the first time that unattended stations CAN transmit
without listening, so that live operators who stray into the mailbox
sub-band will NOT be able to complain if they get hit by a mailbox.
Hopefully this proposal will gain acceptance from both sides,
worldwide and not just in USA, and we can make some progress. Only by
accepting that mailbox and live-QSO operations are completely
incompatible and forcibly separating them can we solve this problem
once and for all.
73
Peter
------------------------------
Date: Mon, 24 Apr 2000 13:08:01 -0100
From: "Julian" <julian@tech-pro.co.uk>
Subject: Re: [psk31] Small gun, better aim
Bob,
Too right a beam is not always an option. Like most G stations I have a
small garden and would not get permission to erect a tower and beam. You
can see it and the antenna I have to work with on my web page. But the
difference a linear makes is less than 2 S-points. If they can't hear you
without the linear they won't copy you much better with it. The main
trouble, in my opinion, is caused by people with beams who would be putting
out a big signal in any case but still insist on running high power. It may
get them a few more contacts, but how many other people *lose* contacts as
a result?
- --
Julian, G4ILO
http://www.tech-pro.co.uk/
"Bob Lewis" <aa4pb@erols.com> wrote:
What if he's working 160, 75 or 40 meters? What if he has a small lot
or antenna restrictions? A beam is not always an option.
------------------------------
Date: Mon, 24 Apr 2000 10:44:21 -0400
From: Harvey Fisher <harvee1@optonline.net>
Subject: Re: [psk31] Small gun, better aim
HERE HERE... BRAVO...
I OFTEN WONDER, DOES AN AMPLIFIER LET YOU HEAR MORE??
SO, THEY
HEAR YOU... THEN WHAT IF YOU CAN'T NEAR THEM?
73
HARVEY-K2CJP
Julian wrote:
>
> Bob,
>
> Too right a beam is not always an option. Like most G stations I have a
> small garden and would not get permission to erect a tower and beam. You
> can see it and the antenna I have to work with on my web page. But the
> difference a linear makes is less than 2 S-points. If they can't hear you
> without the linear they won't copy you much better with it. The main
> trouble, in my opinion, is caused by people with beams who would be putting
> out a big signal in any case but still insist on running high power. It may
> get them a few more contacts, but how many other people *lose* contacts as
> a result?
> --
> Julian, G4ILO
> http://www.tech-pro.co.uk/
>
------------------------------
Date: Mon, 24 Apr 2000 11:20:54 -0700
From: Henry Schickler <w2icw@juno.com>
Subject: [psk31] psk31 and icom 735
Read this great article on psk31 in QST. Said to myself this is for me to
try. Has anyone the dope on connecting up an ICOM 735. Perhaps using the
acc 1 connection. I am going to down load DIGIPLAN. Would like to hear
from someone using this setup.
Hank, W2ICW
------------------------------
Date: Mon, 24 Apr 2000 12:04:07 -0400
From: Vince <wa2rsx@worldnet.att.net>
Subject: Re: [psk31] new to list and need help
Hi Joe:
Welcome to PSK31 mode. I will address some of your concerns as best that I can.
I do not use DigiPan for my PSK31 operation, so, I hope my comments hold true
for your use of DigiPan.
W8JOE@aol.com wrote:
> Hello: Name here is Joe, N8TI. I heard about PSK31, and decided to try it
> today using digipan. What a great mode!
>
> I have some basic questions and I wonder if you guys can help me out:
>
> 1. What are the "calling frequencies" for psk31 on each band, 160 through 10
> meters?
>
> 2. I noticed that I heard everyone on LSB on 20 meters. What is the
> sideband that people use for each frequency, if it is not LSB all the time?
When decoding BPSK, it does not matter which sideband position your radio is
using. If you were to switch to USB, you should still be able to decode BPSK
signals (unless Digipan does not allow this). However, with QPSK, USB is needed
or a REVERSAL/INVERT by software is needed for proper decoding.
> 3. I just Listened today, but want to hook up output from my FT-1000D. Now,
> the help information on the digipan software says you should make up an
> attenuator with a couple of resistors so you can feed directly into the
> microphone. But, the help information also states that if you have some sort
> of advanced mic input, you don't have to use the attenuator. I have a plug
> on the back of my FT1000 which is called "patch in." The FT-1000 manual
> states that the patch in plug is a mic plug that mixes with the mic input
> from the front mic plug, and the FT1000 manual states that the input
> impedance is 500-600 ohms.
>
> Could I just plug into that patch in plug directly? What if I lowered my
> output on my sound card, or would I still have too much microvolts going into
> the FT-1000?
I use a FT1000D here on PSK31, FeldHell and RTTY with the soundcard as an
interface.
Unless you have sufficient amplitude control of the soundcard output audio
level,the attenuation is required when using the PATCH IN jack on your FT1kD
radio. If
you trace the signal path from the PATCH IN and also trace from the MIC
connectoron the schematic diagram, you will find that the signal reaches the
samemicrophone preamplifier transistor stage, in an almost identical manner.
I apply the output from my soundcard via a fixed ratio resistive voltage divider
to the PATCH IN jack on my radio. I use a 100 to 1 attenuation ratio made with
100k and 1k fixed-value resistors; I dont believe that impedance matching is a
critical issue.
That preamplifier stage is expecting an audio level input via a station
microphone or perhaps from a telephone mouth piece. In both cases, the expected
amplitude is approximately 20 millivolts. The output from a LINE jack on a
soundcard is, on the otherhand, in the order of 2 Vrms. The gain provided by the
microphone preamplifier stage is fixed, thus, the need to avoid overdriving that
preamplifier stage by use of an attenuator/voltage divider. (2 Vrms applied via
a 100 to 1 attenuator/voltage divider will result in approximately 2x1/100= 0.02
Vrms , or 20 millivolts.)
You will surely need to adjust the amplitude output from your soundcard by use
ofthe Windows98 mixer software. Without the use of an voltage divider, it is
morelikely that the range of adjustment provided by the software mixer controls
will
not be adequate to prevent/avoid overdrive of the radio's mic preamp stage.
> 4. I used a stereo plug into the output on my sound card and a stereo plug
> into the phone jack on my radio to get the output to the computer sound card.
> With the input, is the computer sound card input a stereo or mono. I am
> afraid that I don't know what a line input or output really is on the
> computer. By the way, I am running a fairly new computer using windows 98.
Basically, LINE IN and LINE OUT amplitude levels are in the order of 2 Vrms (see
the specs for your own soundcard), whereas the microphone input is designed to
receive a much lower amplitude audio signal level; approximately 20 mVrms
(similar to the transmitter microphone preamplifier stage in you FT1000D radio).
To the best of my knowledge, each jack connector on a soundcard is of the stereo
(tip, ring, body) type. Even the soundcard's mic jack is a stereo ckt
connector;however, that connector should not be in use.
You will have to pay attention to the Balance slider controls within the
Windows98 soundcard mixer software when setting up for proper audio amplitude
levels (both for transmit as well as for receive).
> 5. Should I set my sideband offset to zero, so the freq reads true?
It is not clear to me what you mean by this? Perhaps this is a Digipan
issue....
Whenever using your soundcard software, the RX-CLAR and TX-CLAR LEDs on the
FT1000D radio should not be lit The software includes AFC functionality. BTW,
the speech PROC on the FT1000D radio should (must) also be disabled.
Whenever I use PSK31/FeldHell/RTTY, my voice/SSB radio station microphone is
disconnected from the FT1kD and my PC's Internet/Speaker telephone microphone is
disconnected from the soundcard input. This avoids undesirable modulation from
these microphones. Also, I enable the MONItor function on the FT1kD radio so
thatI can hear my own decoded PSK31 tones via the FT1kD's internal speaker.
Furthermore, I use isolation transformers in the rcvd and the xmitr LINEs here,
because of apparent ground loop problems, but that is another story...
> Thanks a lot in advance for this information. 73, Joe. N8TI
I hope that this information is a help to you Joe. Things have worked well for
me and I think will also work well for your FT1kD setup. Good luck.
73s and Have Fun, OM,
~Vince~
------------------------------
Date: Mon, 24 Apr 2000 10:58:35 PDT
From: "Jim Hyatt" <k4jdh@hotmail.com>
Subject: [psk31] FT-890 help
Could someone please help me with specific instructions for connecting a
FT-890 for PSK31.
TNX
Jim Hyatt
------------------------------
Date: Mon, 24 Apr 2000 15:11:23 -0400
From: "Bob Lewis" <aa4pb@erols.com>
Subject: Re: [psk31] Small gun, better aim
> I OFTEN WONDER, DOES AN AMPLIFIER LET
> YOU HEAR MORE??
It does if both stations are running an amp. I'm not pushing amps
here - I don't even own one at the moment. However, there are times
such as trying to overcome noise on 160, 75, or 40 Meters where an amp
can help out. The key is to use the amp only when it is needed (and
there are times like that).
------------------------------
Date: Mon, 24 Apr 2000 16:00:48 -0400
From: "Richard B Drake" <rbdrake@erols.com>
Subject: RE: [psk31] Small gun, better aim
Reciprocity generally holds, that is, two stations radiating the
same power will have the same signal strength to each other. There
are exceptions due to local conditions etc., but generally that
holds true. So, when you hear a station who is just barely above
noise level and he is running a KW ERP (includes antenna gains and
transmission line losses etc.), and you go back to him with 100W
or less ERP, he probably won't hear you. Is there anyone here
going to claim that they have never had that experience? But, go
back to him with a KW ERP and he'll likely get you just barely
above noise level, assuming of course that the noise levels are
about the same. No booming signals but you're talking.
Someone mentioned the Cliperton Island DXpedition earlier. I
worked them on several bands and modes too using 100W (I didn't
have a linear then), but only at times when their signal to me was
at least an S4. At times when they were weaker than that, jumping
into the pile up with 100W was a waste of time. They, and most all
DXpeditions run KW's across the board. Why? Well, would you go to
all the expense and trouble to take a trip like that and then
limit your capabilities for the lack of a linear? I don't think
so. They took one low power rig to run PSK with and made a total
of 4 contacts with that rig. Enough said, I think we have beat
this horse to death, and I see that there are two camps who may as
well just agree to disagree.
- ---
73, Rich - W3ZJ
> -----Original Message-----
> From: owner-psk31@aintel.bi.ehu.es
> [mailto:owner-psk31@aintel.bi.ehu.es]On Behalf Of Julian
> Sent: Monday, April 24, 2000 10:08 AM
> To: PSK31 Mailing List
> Subject: Re: [psk31] Small gun, better aim
>
> But the
> difference a linear makes is less than 2 S-points.
------------------------------
Date: Mon, 24 Apr 2000 18:56:09 -0500
From: "Marcus C. Leatham" <leatham@flash.net>
Subject: Re: [psk31] Small gun, better aim
Sometimes I feel like firing up my linear,
sometimes I work my QRP rig. Sometimes
I work SSB, sometimes I work PSK or CW.
I'm glad I have the freedom to run whatever
kind of rig I want to!
By the way, a 16-gauge shotgun is a BIG
gun even if you only get one shot. What
happened to your .410?
Marcus KR5N
Gettin' fairly tired of this thread.....
------------------------------
Date: Mon, 24 Apr 2000 17:11:41 -0700
From: "Carl Croci" <crocifam@jps.net>
Subject: [psk31] RE: Amplifiers
I wonder HOW an Amplifier can "help" you hear more if you are the one using
the Amp???
I realize that many Amps also have "reciever" preamps which may "help" or
just increase the noise floor..
When a "local" comes on with their KW about all you can do is go for
another band... I think its called selectivity...
73 de NI6Z Carl
------------------------------
Date: Mon, 24 Apr 2000 21:26:20 -0400
From: "Bob Lewis" <aa4pb@erols.com>
Subject: Re: [psk31] RE: Amplifiers
> I wonder HOW an Amplifier can "help" you hear more if you
> are the one using the Amp???
Why do we assume that only one station can use an amp?
------------------------------
Date: Mon, 24 Apr 2000 22:50:32 -0400
From: Harvey Fisher <harvee1@optonline.net>
Subject: Re: [psk31] RE: Amplifiers
I FIND IT AMAZING, HOW THE AMPLIFIER ADVOCATES FIND EVERY EXCUSE IMAGINABLE.
EVER HEAR OF ONE WAY SKIP?
WHAT ABOUT TERRAIN?
THERE ARE MANY MORE, BUT THEN I'D LOS THE POINT.
YOU HEAR THEM. THEY DON'T HEAR YOU.
THEY HEAR YOU. YOU DON'T HEAR THEM.
MEANWHILE FOR THE SAKE OF SAYING "GEE I ALMOST GOT THAT RARE ONE.
MEANWHILE THAT PORTION OF THE BAND, FORGET THE FILTER, (IF YOU ARE HONEST),
IS A TOTAL MESS.
IF YOU CAN'T DO IT WITH 90/100 WATTS AN AMP WILL NOT EITHER.
I MAY NOT BE AN ELECTRONICS ENGINEER NOR A COMMUNICATIONS EXPERT. I HAVE
BEEN ON THE AIR LONG ENOUGH TO UNDERSTAND HOW TO SET-UP, AND USE MY
EQUIPMENT.
THIS AFTERNOON I HEARD A K8 WORKING A STATION IN TURKEY. HE WAS PROUD OF
HIS 200 WATT SIGNAL. HE DID NOT SEE HIS PATTERN. I DID. NEEDLESS TO SAY HE
WOULD HAVE DONE THE SAME
THING WITH 50 WATTS.
OH WELL... AND HO-HUM. WHAT WILL BE WILL BE.
73
HARVEY-K2CJP
Bob Lewis wrote:
>
> > I wonder HOW an Amplifier can "help" you hear more if you
> > are the one using the Amp???
>
> Why do we assume that only one station can use an amp?
>
------------------------------
Date: Tue, 25 Apr 2000 00:13:42 -0400
From: Fran Flynn <fflynn@together.net>
Subject: [psk31] filters
I have my email filter set to "amplifier = trash".
Enough already, please.
- -km1z
------------------------------
Date: Mon, 24 Apr 2000 22:50:06 -0600
From: "Gary McDuffie, Sr." <mcduffie@scottsbluff.net>
Subject: Re: [psk31] filters
On Tue, 25 Apr 2000 00:13:42 -0400, Fran Flynn wrote:
> I have my email filter set to "amplifier = trash".
>
> Enough already, please.
Amen!
ag0n at arrl dot net
- --
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End of Psk31 Digest V1 #374
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