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Subj: PSK31 Digest V1 #430
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To : PSK31@WW.SYD.NSW.AUS.OC
De: Psk31 Digest <owner-psk31@aintel.bi.ehu.es>
Para: <psk31-digest@bipt106.bi.ehu.es>
Asunto: Psk31 Digest V1 #430
Fecha: miércoles 21 de junio de 2000 4:28
Psk31 Digest Wednesday, June 21 2000 Volume 01 : Number 430
In this issue:
Re: [psk31] 60 Hz hum
[psk31] Re: [RigBlaster] RIGblaster, PSK31 and Laptops
Re: [psk31] Fwd: [hfsig] First PICCOLO 2000 QSO
[psk31] Grounds and PC to Rig interconnections
[psk31] Phone Patch?
[psk31] New QSL's
Re: [psk31] PSK and Field Day
Re: [psk31] Phone Patch?
Re: [psk31] Phone Patch?
[psk31] Fwd: [hfsig] Piccolo 2000 Tentative Spec
Re: [psk31] Phone Patch?
See the end of the digest for information about psk31-digest
----------------------------------------------------------------------
Date: Mon, 19 Jun 2000 19:21:12 -0700
From: "Dick Hughes" <rahughes@worldnet.att.net>
Subject: Re: [psk31] 60 Hz hum
I just got through with a 60 hz hum session that was coming from my Hygain
Ham-IV control box. I determined through the use of jumper cables that I
had some kind of ground loop problem. I had not finished grounding my new
station layout. Tonight, I grounded everything in the shack of any
significance, including the control box and computer to my common rf ground
plate (PolyPhaser stuff). Hums gone. Quiet as a mouse. I'm just getting
too old to crawl around under tables hooking up ground cables. :-)
Dick Hughes - W6CCD
- ----- Original Message -----
From: "berferd" <jrp@dimensional.com>
To: "PSK 31 Reflector" <psk31@bipt106.bi.ehu.es>
Sent: Monday, June 19, 2000 12:19 PM
Subject: [psk31] 60 Hz hum
> Hi,
>
> I've been operating PSK31 for about a month now. The txcr is
> an Icom IC-756 and I use the accessory jack with 1:1 audio
> transformers. The schematic I used is located at
> http://www.packetradio.com/sb16rads/ic8acc.gif
>
> Last night I was operating voice and the person I was talking
> to said there was a 60Hz hum in my audio. I shut down
> everything in the shack except for the txcr, but the hum
> was still there.
>
> The last thing I tried was unplugging the DIN plug for my psk31
> interface from the rig. The hum disappeared. What confuses
> me is that my computer was powered off (although it was still
> plugged into the power strip). I didn't get a chance to try it
> with the DIN plug connected to the txcr and the computer
> unpluged from the power strip.
>
> All my radio equipment is connected to an RF ground, but
> the computer isn't. I was wondering if anyone else has
> experienced this problem.
>
> 73,
> Jeff KI0RO
>
>
> +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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> +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>
>
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------------------------------
Date: Tue, 20 Jun 2000 08:07:26 -0400
From: "Larry Van Horn (Monitoring Times)" <larry@grove-ent.com>
Subject: [psk31] Re: [RigBlaster] RIGblaster, PSK31 and Laptops
Just a quick note in support of John's post. I am using one of the most
possessed laptops ever (an EDS 200 MHz), and have had problems with
interfacing software and hardware before with this unit. RigBlaster
performed flawlessly and was sooooo easy to setup. They have a top notch
product and I am glad I made the purchase (I avoided the Dayton rush, hi,
hi). Standard disclaimer applies: I have no financial association with West
Mountain Radio, just a very very satisfied customer.
Larry Van Horn
N5FPW/NNN0JVP: Member-ARRL/Navy-MC MARS/10-10 Intl/Triode ARC
Monitoring Times Magazine - Grove Enterprises Publisher, Brasstown, NC
MT Assistant Editor-Fed File/Milcom/Scan Logs/Service Search Columnist
V-828-837-9200/F-828-837-2216/800-438-8155, http://www.grove-ent.com
- ----- Original Message -----
From: <Jkn1olo@aol.com>
To: <psk31@bipt106.bi.ehu.es>; <psk31@qth.net>; <RIGblaster@qth.net>
Sent: Monday, June 19, 2000 7:57 PM
Subject: [RigBlaster] RIGblaster, PSK31 and Laptops
>
>
>
> There have been posts to several news groups and reflectors stating that
the
> RIGblaster does not work with laptops. This is not true. While the early
> version of the RIGblaster had difficulties with audio from 1 particular
> laptop this should not be considered an indictment of all laptops or the
> RIGblaster. The current version of the RIGblaster takes into consideration
> the variation of audio output in the majority of machine. Since the design
> change we have not had any complaints of low audio output due to the
> attenuate network design.
>
> Invariably the problems have been due to bad audio cable, misadjusted
> computer audio setting or attempting to transmit at a frequency outside
the
> audio band pass of the computer (e.g.: 100hz from DIGIPAN).
>
> If there are any problems with the earlier version there is a easy field
> modification. Please feel free to contact me directly for the instructions
on
> identifying the early models and the fix. You can also see the support
page
> at www.westmountainradio.com.
>
>
> 73 and thanks for the bandwidth
>
> John Kalotai
> N1OLO
> West Mountain Radio
>
> ______________________________________________________
>
> To leave RigBlaster , send mailto:majordomo@qth.net
> with the BODY of the message containing:
>
> unsubscribe rigblaster
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------------------------------
Date: Tue, 20 Jun 2000 07:29:00 -0700 (PDT)
From: Carl Hyde <cshyde@yahoo.com>
Subject: Re: [psk31] Fwd: [hfsig] First PICCOLO 2000 QSO
What the heck is PICCOLO 2000?????
- --- Eduardo Jacob <edu@kender.es> wrote:
>
> As Murray or Nino didn't crosspost here I forward
> it:
>
> >From: "Nino Porcino" <porcino@sysonline.it>
> >Subject: [hfsig] First PICCOLO 2000 QSO
> >Date: Sun, 18 Jun 2000 12:15:56 +0200
> >I'm proud to announce that today me (IZ8BLY) and
> Murray (ZL1BPU) have made the first Piccolo 2000
> QSO! It was a 17,000 Km DX, nice result eh?
> >
> >The new mode showed great advantage over PSK
> modulation and performed quite error-free with
> barely audible signals.
> >
> >Among the various combinations the most interesting
> was: 32-tones MFSK running at 7.8125 baud, spaced
> 7.8125 Hz each for a total bandwidth of 250 Hz. The
> use of Varicode and FEC convolutional code (R=1/2,
> K=7) provided a reasonably good typing speed of
> approx 20 WPM.
> >
> >This mode promises well!
> >
> >- Nino IZ8BLY
>
>
>
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>
> More instructions on PSK31 Webpage:
> http://aintel.bi.ehu.es/psk31.html
>
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>
=====
Carl HYDE
W2CSH
__________________________________________________
Do You Yahoo!?
Send instant messages with Yahoo! Messenger.
http://im.yahoo.com/
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------------------------------
Date: Tue, 20 Jun 2000 11:06:48 -0400
From: "Robert Lay" <w9dmk@crosslink.net>
Subject: [psk31] Grounds and PC to Rig interconnections
Dear Fellow Warblers,
Some additional comments and explanation on my suggestion to use a "ground
breaker" adapter plug are in order.
First, I do not reccommend having the PC ungrounded - I just prefer to have
it grounded through other than the green wire on the power cord. My PC has a
large, braided ground strap connecting from the chassis to the transceiver,
and from there to the amplifier and from there to the tuner and from there
to the earth rod which is also the ground point for the Service Entry Panel.
As you can readily see, that is a good earth ground.
Everything in a hamshack has sneak paths (usually through the interwinding
capacitance of power transfromers) to grounds other than the direct path
through the main ground strap that you put in specifically to ground the
hamshack equipment. These additional paths can produce so-called "ground
loops" that lead to hum and other problems.
Any time a 1:1 isolation transformer is used and the schematic shows that
one side of each winding is being grounded, it is not a good idea to take
that literally. I may connect the "ground" side of a winding back to the
equipment ground for that side of the transformer, but that does NOT mean
that the "ground" of one piece of equipment and the ground of another piece
of equiipment are necessarily the same ground, or that they are even
connected together, and it certainly does not mean that the two "grounds"
are necessarily at the same potential. So, the last thing that I would do is
to connect the "ground" leads of a 1:1 isolation transformer together at the
transformer. That would be a good way to INSURE that undesirable ground loop
currents WILL be MIXED IN with the signal. The whole purpose of the
isolation transformer is to BREAK that direct connection.
In other words, there are grounds and there are grounds, and saying that
something is "ground" or "grounded" or naming a point as a "ground" DOES NOT
necessarily make it a "good" ground nor does it insure that all such points
are at the same potential.
PLEASE do not wave the National Electrical Code around as if it has all the
answers. The NEC is a necessary standard, and it has the respect of the
insurance companies, etc., but it is not infallible, and it can be very
difficult for a ham station to be in full compliance with all of its
provisions at once. For example, I believe it requires that your antenna
system be earthed at the same single point where your Service Entry Panel is
earthed. How many hams actually connect their antenna systems to that ground
rod before it enters the house?
(By the way, mine does.)
73 de Bob, W9DMK, King George, VA
http://www.qsl.net/w9dmk
http://www.fortunecity.com/meltingpot/albania/784
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------------------------------
Date: Tue, 20 Jun 2000 10:24:46 -0500
From: Robbie Robertson <mwrobertson@mediaone.net>
Subject: [psk31] Phone Patch?
Hi fellers,
Thinking of Field Day 2000, and what equipment I was
going to take to the site, I wanted to set something up
that would allow me to stay on PSK with different rigs
or what ever, I came upon my old Heathkit Phone patch..
Audio from PC to phone line in, Phone Patch microphone
out to TXcvr, Micropone to Phone Patch.. THis gives me
Null balance, Level monitor, PSK or Mic mode with just
a flip of the switch, nice clean audio with
unbelieveable audio control.
Sure glad I didn't throw the Phone Patch away!
Robbie
- --
- ----------------------------
Are we having fun yet?
73 - Robbie - WA9INF
******* --... ...-- *******
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------------------------------
Date: Tue, 20 Jun 2000 16:42:35 +0100
From: Mike Sloan <gu3whn@gtonline.net>
Subject: [psk31] New QSL's
Hello all. GU is rather like being on a DXpedition all the time. Great
but lot's of contacts, all expecting QSL cards.
Have reorganised the shack and hope to get back up to speed on PSK31.
New computer expected so not quite there yet.
Please note that my QSL condx have changed after 35 years and 100% QSL.
Direct with postage or www.eQSL.cc only please.
SWL's via Buro as the one exception.
QSL's uploaded at least once a week. PSK31 contacts since the New Year
already available for download.
Have operated almost exclusively on PSK31 since last Summer hence my
posting to this group.
Thank you for the space.
Vy 73
Mike GU3WHN Ex 9V1OB DA2XS
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------------------------------
Date: Tue, 20 Jun 2000 12:52:25 -0400
From: "Carl J. Denbow" <ka8jxg@callsign.net>
Subject: Re: [psk31] PSK and Field Day
For the first time in my "ham life" I'm free to work FD, but (Murphy's law
working perfectly), all of the "old FD hands" in our local club are not
available so the club is not -- for the first time in memory -- having a FD
event. However, since this is the first year I'm available, I'd like to do
some FD work from home. I've never even heard FD on the air because I've
always had a business convention this weekend -- which was moved up a week
this year. How about that for coordinating schedules? Any guidance that
could be given would be appreciated. I'm a new general but a FD "novice"!
; - )
73
Carl -- KA8JXG
- ----- Original Message -----
From: "Kenneth Wolfe" <n8gcdken@mpdr0.detroit.mi.ameritech.net>
To: <Ebruchac@aol.com>
Cc: <psk31@bipt106.bi.ehu.es>
Sent: June 15, 2000 9:54 PM
Subject: Re: [psk31] PSK and Field Day
> Hey Gang;
> This will be my first participation in Field Day with our local club in
> Michigan, in my 27 years as a Ham, and volunteered to run the PSK31
> stations public event area, I want to know what exactly do I have to
> program into the Macros for the Digipan program, You know like RST, your
> 589, operating mode i.e. 5A etc. just don't want to muck it about as it
> were. Any help would be appreciated, just tell me if qst had it in what
> issue, or something similar.
>
> Thanks, Tons..N8GCD Ken
>
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>
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> +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>
>
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------------------------------
Date: Tue, 20 Jun 2000 11:23:44 -0600
From: "Gary McDuffie, Sr." <mcduffie@scottsbluff.net>
Subject: Re: [psk31] Phone Patch?
On Tue, 20 Jun 2000 10:24:46 -0500, Robbie Robertson wrote:
> Audio from PC to phone line in, Phone Patch microphone
> out to TXcvr, Micropone to Phone Patch.. THis gives me
> Null balance, Level monitor, PSK or Mic mode with just
> a flip of the switch, nice clean audio with
> unbelieveable audio control.
I can just see the waterfall on that one!
gm
ag0n at arrl dot net
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------------------------------
Date: Tue, 20 Jun 2000 13:46:25 -0400
From: "Fred Decker" <fdecker@csi.com>
Subject: Re: [psk31] Phone Patch?
I guess *any* autopatch should work then? I have a big old one from a
Yeasu FT-101E, and one Kenwood PC-1A. I will have to try it.
Fred
N4IXL
>
> Hi fellers,
>
> Thinking of Field Day 2000, and what equipment I was
> going to take to the site, I wanted to set something up
> that would allow me to stay on PSK with different rigs
> or what ever, I came upon my old Heathkit Phone patch..
>
> Audio from PC to phone line in, Phone Patch microphone
> out to TXcvr, Micropone to Phone Patch.. THis gives me
> Null balance, Level monitor, PSK or Mic mode with just
> a flip of the switch, nice clean audio with
> unbelieveable audio control.
>
> Sure glad I didn't throw the Phone Patch away!
>
> Robbie
>
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------------------------------
Date: Tue, 20 Jun 2000 21:47:29 +0200
From: Eduardo Jacob <edu@kender.es>
Subject: [psk31] Fwd: [hfsig] Piccolo 2000 Tentative Spec
Posting from Murray ZL1BPU on hfsig
>PICCOLO 2000 TENTATIVE SPECIFICATION
>====================================
>
>An 8FSK mode for HF DX nets and rag-chewing. A platform on which to test
>various associated data code and FEC techniques. Very low speed options
>for weak signal LF and VHF use.
>
>A. General Description
>======================
>
>An easy to use Amateur chat mode (suitable for nets, but not intended
>for contesting), with comfortable typing speed and modest latency
>(turn around time). Performance as good or better than existing
>techniques for long-haul DX, such as long path 20 metres. Robust in
>fading conditions and in moderate QRM such as is prevalent in Europe.
>A very low speed option would provide good performance for LF or VHF
>weak signal use where superior signal path stability can be assured.
>
>It is believed that an M-ary FSK system can fulfill these requirements.
>
>B. Transmission Technique
>=========================
>
>Transmission to be based on 8FSK (8 tone sequential FSK), with continuous
>phase (CPSK) tones shaped for reasonable bandwidth and if necessary to
>allow data clock recovery. Transmission bandwidth to be preferably less
>than 300 Hz when properly adjusted. Transmitter linearity requirements
>to be modest.
>
>The system is to offer symbol rates related to the tone spacing at
>(tone spacing / n) baud steps where n = 2 to 8.
>
>Transmission tones (and receiver as well) should be adjustable to suit
>different transceiver IF filters. Low (~1kHz) and high (~2 kHz)
>alternatives to be accommodated without change of actual tone spacing.
>
>Bit stream oriented transmission, allowing convolutional code FEC,
>Varicode and binary transfer options. This approach would also allow
>data block transmission over sequential tones, such as is used in
>Piccolo (two sequential tones per character).
>
>The actual buad rate and coding technique in use should preferably
>be obvious from the nature of the signal, or indicated by the receiver
>software. I guess a fallback position would be CWID with mode. The fewer
>the modes, the lesser the problem of course.
>
>C. Receiver
>===========
>
>Receiver to use non-coherent demodulation, probably using an FFT filter
>and demodulator, integrating the signal over the whole symbol tone
>period by sampling the complete period. Decoder to use bit-wise soft
>decisions and offer various data and FEC decoding options.
>
>Decoder to provide tuning indication, AGC and AFC as well as signal
>performance metering. This mode will be very sensitive, so consideration
>needs to be given to accurately tuning inaudible signals.
>
>The symbol rate (and FFT solution rate) should be settable at
>(tone spacing / n) baud steps in concert with the transmitter, where
>n = 2 to 8 to ensure orthogonality.
>
>D. Other Requirements
>=====================
>
>Symbol synchronisation using detected bitstream metrics or other
>techniques not reliant on signal amplitude. A user interface with
>the now-expected features such as waterfall display, point and click
>tuning, signal strength and quality meters, separate TX and RX windows,
>type-ahead buffer and simple macros.
>
>Mode menu offering the different symbol rates and coding options.
>CWID and a transmitter tuning signal. Transmit control via VOX or
>serial port. Receiver squelch option.
>
>E. Platform
>===========
>
>Pentium class PC with SB16 sound card or equivalent and VGA display.
>Serial port PTT control as per GNR. Operating system Win95, 98 or NT.
>Should operate on at least a Pentium 60. Design, specifications and
>source code to be open. Parallel development of a Linux alternative
>would be ideal. How about the Motorola EVM or the PTC-II?
>
>User software to be copyright, all rights retained by the various
>authors, but for free use by all Amateur users. No commercial or
>military use permitted and no responsibility for damages or lack of
>performance assumed.
>
>F. Project Plan
>===============
>
>Following acceptance of this broad specification by those volunteers
>involved in the project, a system block diagram would be issued and
>agreed. At this point system software writer(s) and integrator(s) would
>be selected or volunteer, and other jobs apportioned accordingly. The
>integrator(s) would probably issue requests for suitable algorithms,
>and a certain amount of testing and research would take place.
>
>Also at this point a detailed specification for Phase 1 would be issued.
>Specifications for Phase 2 and Phase 3 would follow discussion of
>results of the previous stages.
>
>Phase 1: a test platform with selectable baud rates, simple ASCII
>coding and no error correction. Intended to optimise symbol
>synchronisation and demodulator performance. User interface can be
>incomplete.
>
>Phase 2: a test platform for FEC and Interleave options. User interface
>should be reasonably complete, with creature features and tuning display.
>Metering (especially decoder metrics) should be operational. At this
>point a beta version might be released.
>
>Phase 3: a released product for general Amateur use. This will be
>thoroughly tested and debugged, have optimised performance and a
>limited set of the best FEC, data code and baud rate options. This
>version will be fully documented prior to release. Hopefully performance
>comparisons with other codes will have been completed prior to release.
>
>========================================================================
>Notes
>
>1.
>MFSK has very good performance on fading channels when using
>non-coherent demodulation. The performance improves as the number
>of channels (tones) increases. Because no assumptions of signal
>phase are made, provided the phase errors introduced by the path
>do not lead to excessive cross talk in the receiver filters, the
>technique is essentially immune to "Ionospheric Doppler" effects.
>The sensitivity and crud rejection of MFSK is also very good, since
>(a) the bandwidth per detected tone is low, (b) the signal is
>integrated over the whole symbol duration, and (c) the soft decision
>bitwise decoder provides best possible S/N of the result.
>
>Typing speed of around 25 WPM would be adequate. Faster options
>would be preferable when conditions allowed. Slow alternatives for
>the QRP/LF/VHF folk.
>
>2.
>8 tone MFSK allows transmission of three bits per symbol.
>Tone spacing of 31.25 Hz would allow baud rates as high as 1/2T
>(15.625 baud - 47 bps) and a transmission bandwidth of about 300 Hz.
>47 bps with a 5 bit data code and R=1/2 FEC coding would provide
>4.7 characters / sec (47 WPM). Mere mortals would use lower baud
>rates to achieve better performance at more modest typing speeds.
>
>Although not part of this specification, the transmitter, the
>receiver technique and the soft decoder would all permit n-of-8
>tone operation, with improved throughput at a modest power penalty.
>For example 2-of-8 would allow at least 4 bits/symbol and 64 bps.
>
>Also not part of this specification, addition of an ARQ layer
>would permit a similar mode to be used for very effective automatic
>link applications.
>
>Speed suggestions are based on an 8 kHz sound card sample rate.
>Modest linearity requirements imply a certain tolerance of poor
>transmitter adjustment by amateurs who know no better (c.f. the
>problems with PSK31). Use of continuous phase tones with no AM
>would help in this regard.
>
>3.
>A bit stream receiver with soft decoding will allow very good
>FEC to be deployed. A R=1/2 K = 7 Viterbi system with very fast
>decoder is offered by Phil KA9Q. Interleaving is recommended.
>
>Lower baud rates could be simply achieved by summing sequential
>results from the decoder prior to the soft decision point. This
>technique would of course require logic to decide which samples
>belonged together (correct samples will have high cross
>correlation).
>
>4.
>A "Costas Signal" synchronising system is suggested by Phil Karn
>KA9Q. This consists of a unique symbol sequence interleaved with the
>data that has a strong correlation response. Such a system is very
>robust in multi-tone orthogonal systems, and does not have any
>transmission symbol envelope shaping requirements. It also does not
>rely on an independent AM detector of lesser performance (c.f. PSK31).
>The system must cope with 0.1% sound card sampling rate errors.
>
>The FFT receiver would also provide the information for a waterfall
>display, AFC, the signal strength meter (actually an Eb/No meter
>approximation), possibly squelch and a peak signal level for AGC use.
>
>5.
>Acceptance by the widest cross-section of the Amateur community
>is more likely if the system requirements are universally available,
>specifications and source are open, if the software exists on multiple
>platforms, and is well documented and presented. Of course the coding
>details must be made public in any case.
>
>6.
>All stages of the project should be open to comment. Volunteers are
>sought for research, coding, system integration, UI design,
>documentation, publicity and testing. Testing should include
>ionospheric simulation tests (please note Johan KC7WW).
>
>A closed Reflector might be started for detailed discussion of the
>development by those who have agreed to have input or provide output.
>
>Author:
>
>Murray Greenman ZL1BPU
>06/06/00
>
>Note that the author is a digital mode enthusiast and technical writer,
>not a whizzo digital signal processing or programming expert. The author
>is prepared to coordinate and document the effort, and would prefer the
>driving of the spec and the programming of this project to be coordinated
>by folk with more experience.
>
>All suggestions in this document are open to constructive criticism.
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------------------------------
Date: Tue, 20 Jun 2000 15:58:52 -0600
From: "Gary McDuffie, Sr." <mcduffie@scottsbluff.net>
Subject: Re: [psk31] Phone Patch?
On Tue, 20 Jun 2000 11:23:44 -0600, Gary McDuffie, Sr. wrote:
> I can just see the waterfall on that one!
Sorry... I thought you were going to REMOTE your PSK via the phone
patch! Silly me.
Gary
ag0n at arrl dot net
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End of Psk31 Digest V1 #430
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