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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 #97
Fecha: domingo 4 de julio de 1999 4:59
Psk31 Digest Sunday, July 4 1999 Volume 01 : Number 097
In this issue:
[none]
[psk31] September PSK31 Contest...correction
Re: [psk31] PSKGNR + ADIF logging
[psk31] PTT Circuit pin out for FT-990
[psk31] CW Receive and LSB Transmit with the IC-765 (long)
See the end of the digest for information about psk31-digest
----------------------------------------------------------------------
Date: Fri, 02 Jul 1999 22:24:12 -0400
From: Daryl <jdc@cfw.com>
Subject: [none]
If nothing major goes wrong I will hopefully make my first PSK31 contact
tomorrow evening. I have about got my little interface curcuit built and am
painting the housing for it. I am assuming 7035.150 is still the unofficial
Hailing freq. for 40 meter ????? By the time I get on I imagine 20 will be
dead. I finally found the mounting plate for my motorola maratrac I use for
a 2-meter mobile so I need to get that reinstalled and take a spare power
supply to another city to get the computer that controls the Local DX
Cluster UHF backbone back up and running. I'll have a full day of it
tomorrow. I usually have to go back to work on mondays to rest up from the
weekend.
:-)
*************************
Daryl Cline WB4YEX
Homepage: http://www.cfw.com/~jdc
****************************************
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Date: Sat, 3 Jul 1999 08:14:54 -0400
From: "Andrew J. O'Brien" <obrienaj@netsync.net>
Subject: [psk31] September PSK31 Contest...correction
Two typos in the original text announcing the contest, the result of
relying on cut and paste and not paying attention, hi!
The bands of operation are 80, 40, 20, 15, 10 and do not include WARC bands
.
The homepage URL had a typo , it is:
http://www.netsync.net/users/obrienaj/carc.htm
73 de Andy KB2EOQ
------------------------------
Date: Sat, 3 Jul 1999 07:27:47 -0500
From: "hasan schiers" <schiers@netins.net>
Subject: Re: [psk31] PSKGNR + ADIF logging
I believe ADIF means Advanced Data Interchange Format and all new logging
(and old if they are updated) are supposed to support this universal data
format for exporting and importing logs. This means that no matter what your
favorite logging program is, you don't have to do double entry to get it
from one program or another should you change.
In my case, I use TRX Manager which has a mini-log built into it. I use it
because it is a fantastic rig control program for the Yaesu FT-847 (and
others), but it doesn't have the search/award tracking stuff in it that
Log-EQF has. When Log-EQF becomes a windows program (Tom is working on it),
then I can use it exclusively and on the same machine that psk31 is running
on. (Love USB ports!)
It should be noted that I am running Log-EQF and TRX Manager on a different
computer than psk31, hence the need for ADIF logging support in gnr's
program should he put logging into it, as he has proposed.
Interoperability is becoming a bigger feature all the time with these
machines and their software. One nice success story is WD5GNR's support for
the FCC database for U.S.A. callsigns. The database is free, updated weekly
and while it is a 25mb download (nice to use GetRight for a scheduled
download between midnight and 3:00 a.m.) and takes up 75 mb of hard disk
space, with the large size of hard disks today, it isn't a problem. The
other nice feature of the way various programmers are implementing the FCC
downloadable database, is we only need one copy of the database on our
system, including network!
Al's lookup engine for the FCC database runs perfectly across a network.
WinAPRS requires that the database be in \winaprs\data. I just point Al's
program at that directory on the server and it works perfectly. Tom Dandrea
(author of Log-EQF) has assured me that he will be putting out a version
"real soon now" that supports the FCC database as well. There we go...3
apps, one database in common!
We need to encourage software authors to use things like ADIF (make it
available, it doesn't have to be the routine data structure for their main
database), and the FCC Database. It makes our life easier, cheaper and more
accurate while consuming fewer precious resources (like a CD-ROM) on our
computers.
73
hasan schiers
schiers@netins.net
N0AN
hasan schiers
schiers@netins.net
N0AN
- ----- Original Message -----
From: Richard L. Mock <mock@teleport.com>
To: Al Williams <alw@al-williams.com>; PSK31 <psk31@bipt106.bi.ehu.es>; PSK
Tara <psk@n2ty.org>
Sent: Friday, July 02, 1999 1:39 PM
Subject: Re: [psk31] PSKGNR + ADIF logging
>
> I don't know what ADIF means, but my own logging program creation runs
> in DOS. Export/import via a file could be easily implemented. It would
> seem yo me that unless one's logging program is windows based, the file
> transfer method would be more universal.
>
> Thanks for asking.
>
>
------------------------------
Date: Sat, 3 Jul 1999 14:42:49 -0700
From: k3wj@arrl.net
Subject: [psk31] PTT Circuit pin out for FT-990
03 July 1999
Hi to all!
My Dad wants to get on PSK31 with his FT-990. I'm looking
at his manual and I don't see a jack that will allow PTT,
ground, AF in, AF out all in one jack except Packet which
only operates in LSB or FM when pushed from the front
panel. I know others have wired up the FT-990 because I've
seen the postings on here. Could someone that has please
reply with how you wired your rig?
Thanks in advance!
Jay K3WJ
k3wj@arrl.net
_______________________________________________________________
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------------------------------
Date: Sat, 03 Jul 1999 20:34:35 -0500
From: "George T. Baker" <w5yr@swbell.net>
Subject: [psk31] CW Receive and LSB Transmit with the IC-765 (long)
I have been asked by several fellow warblers to document the exact setup
I use with my Icom IC-765 that allows me to receive PSK31 signals using
the 500 Hz and 250 Hz filters. In the 765, and in many other rigs of its
vintage, filter selection is tied to mode selection, and the narrow
filters are available only in the CW Narrow or RTTY Narrow modes.
Additionally the 765 allows 250 Hz filter use only in CW Narrow mode in
which the 500 Hz filter is already engaged.
Peter (G3PLX) has made a strong case that narrow filters prior to the
filtering operations within PSK31 have little beneficial effect on
improving print in the face of strong adjacent signals. I agree
completely and defend my use of narrow filters only on the basis of (1)
they keep me from hearing a lot of QRM/QRN; (2) they possibly improve
copy somewhat by keeping strong nearby stations from controlling the
receiver AGC; and (3) I am accustomed to the sound of the receiver while
receiving CW, my other favorite mode, and find it more natural to tune to
a 700 Hz signal than to a 1000 Hz signal.
I had hoped to keep this note somewhat brief with only the procedural
steps being described, but the length of the end product confirms that I
failed.
A lot can be said on the theory of operation of the 765 which requires
that certain of these steps be performed, but that is the subject of
perhaps another note if enough folks are interested.
SETUP FOR THE PSK31 PROGRAM
1. Sample rate: whatever works for your system; 11025.0 works fine for me
and provides a transmitted tone that is within much less than 0.1 Hertz
of whatever PSK31 frequencies are selected.
2. Center Frequency: 700
3. Callsign
4. Inverted QPSK: checked, as we will be receiving on a lower-sideband
mode when we select CW for receiving
5. PTT control: as appropriate
6. Narrow filter: personal preference - I like to use it so mine is
checked.
7. On the main window, check AFC and NET. Tx and Rx frequencies will both
be 700 Hz initially but will change with AFC and NET action.
SETUP FOR 765
1. Select VFO operation
2. Select SPLIT mode to receive on VFO-A and transmit on VFO-B
3. Set VFO-A to CW Narrow mode
4. Using VFO-A, tune in a PSK signal to a tone of 700 Hz to be centered
in the waterfall display, much as you would tune a CW signal to that
beatnote. Since the 765 tunes only in 10 Hz steps, you must allow PSK31
to do the final tuning within a 10 Hz range with the AFC function. Give
the program a few seconds to AFC the signal to the center of the
waterfall - note the new Rx Frequency and its offset from 700 Hz.
(I find it convenient to tune the 765 dial such that the offset is less
than 10 Hz - more on this later: NOTE A)
5. With the PSK signal tuned in and centered in the waterfall, press
'A=B' and hold it until the function is completed (two beeps sound) in
usual 765 fashion.
6. Press 'VFO A/B' to transfer control to VFO-B
7. Change the mode to LSB
8. KEY STEP: *increase* the dial reading by 0.7 (700 Hz). Example: you
tune in the PSK31 station with VFO-A with the dial reading 14.071.53.
When you have switched to LSB on VFO-B, change the dial to read
14.072.23, which is 700 Hz higher.
(This is the crucial step which causes the 765 to transmit your PSK31
signal on very nearly the same frequency as you are receiving - more on
this later: NOTE B)
9. Return control to VFO-A with the 'VFO A/B' button
10. Continue, receiving in CW Narrow mode with VFO-A and transmitting in
LSB mode with VFO-B.
WHEN YOU TRANSMIT, USING VFO-B IN LSB MODE, YOUR ACTUAL TRANSMITTED
FREQUENCY WILL DIFFER SLIGHTLY (10 HZ OR LESS) FROM THAT OF YOUR CONTACT
SINCE YOU CAN ONLY SET FREQUENCY IN THE 765 TO THE NEAREST 10 HZ. DON'T
WORRY - ON AVERAGE YOU WILL BE OFF NO MORE THAN 5 HZ AND AFC AT THE OTHER
END WILL SHORTLY HAVE YOU TUNED IN ON THE NOSE! THE NET AND AFC
CAPABILITIES AT EACH END WILL KEEP THINGS TOGETHER.
Now, all that sounds complicated and long and tedious - it does because I
almost told you how to build a clock when you asked for the time.
Operationally, it is much simpler:
1. Tune in the PSK31 station with VFO-A
2. A=B and change to VFO-B
3. VFO-B to LSB and 0.7 higher dial reading
4. Back to VFO-A and carry on
That is the brief procedure that you do each time you change to a
different frequency/station, but in return for those few seconds of
button-pushing and knob-twisting, you get 500 Hz and/or 250 Hz
selectivity.
Now, for some fine print:
NOTE A
PSK31 can "grab" a signal anywhere in the waterfall, up to 250 Hz away
from center, and with a mouse click move it to the center and adjust the
Rx Frequency and Tx Frequency to match. That is good and convenient. But,
there are two possible "gotchas" here!
First, we have to be careful to ensure that our transmitted frequency
(which will be the LSB dial frequency less 700 Hz +/- the AFC-controlled
offset from 700 Hz) remains sufficiently within the transmitter LSB
passband to output the power we desire. The problem here is that 700 Hz
is down a bit on the SSB filter skirt and, on my rig, just barely puts
out full power as compared with a 1000 Hz signal which is well within the
filter passband and produces full power easily. Your mileage may vary as
not all filters are the same. I did find that lowering the Tx Frequency
to 600 Hz or below noticeably reduced the transmitter power output. In
any event, since most folks seldom run over 50 watts output on PSK31 this
small power reduction should not be a problem.
Second, the other side of this coin concerns the CW Narrow filters which
are effectively centered on 700 Hz. If we use a Rx Frequency very far
removed from 700 Hz, we run the risk of operating on or near the filter
skirts with decreased output and possibly some slight phase distortion.
My tests show that if Rx Frequency remains within about +/- 100 Hz of 700
Hz, the received signal remains well within the 765's 250- Hz filter
passband.
In summary of this point, you can operate with a Rx Frequency from about
600 Hz to about 800 Hz with no problem from the 765 receive filters. You
can transmit at any reasonable frequency *above* 700 Hz and again no
problem. But, if Tx Frequency is much below 700 Hz your transmitted
signal power will be decreased.
NOTE B
The procedure above specifies that 0.7 is to be added to the received
signal frequency when adjusting VFO-B in LSB mode.
THIS IS THE CORRECT NUMBER *ONLY* IF THE 765 BFO FREQUENCIES ARE
CORRECTLY ADJUSTED.
If your 765 has not been recently aligned, a simple test will enable you
to correct for any mis-alignment and still use the procedure.
In Step 10 above when you have returned to VFO-A, verify that the PSK31
signal is still centered in the waterfall and note the RX Frequency
reading in the window. In particular, note the offset from 700 Hz. Now,
press 'VFO A/B' to return to LSB mode. If your 765 is correctly aligned,
you will be within a few Hertz of the same Rx Frequency and within a few
seconds, the phase scope will be centered. Note the total frequency
difference between Rx Frequency with VFO-A and with VFO-B after the AFC
has settled down. That is the total frequency difference with which your
signal will be received at the other end and is the amount that the other
station's AFC will adjust for your signal.
If the required frequency change is over 10 Hz, then your BFO frequencies
are off. However, this is easily compensated for without realignment of
the 765. With VFO-B simply adjust the dial reading slowly up or down in
10 Hz steps until you find the dial reading in LSB mode that gives the
*smallest* Rx Frequency difference between using VFO-A and VFO-B. That
will also be the dial reading that comes closest to centering the phase
scope and gives you good print. When you have the right value, the signal
should sound exactly the same in either receive mode, except for the
added noise, etc. in the LSB mode. Subtract that dial reading from the
VFO-A dial reading, or vice versa, and that is the number that you add to
the VFO-A dial reading in Step 8, instead of 0.7.
An example: VFO-A dial is 14.071.53. You find that you have to set VFO-B
dial to 14.072.24 instead of the 14.072.23 we used in the example in Step
8. The difference is 14.072.24 less 14.071.53 = 0.71. So, the frequency
value for your radio to add to the VFO-A dial reading will be 0.71
instead of the ideal 0.7. It works the other way as well. Suppose that
your dial reading is 14.072.22. Subtracting this from 14.071.53 gives
0.69 for your number. In both cases, one of the BFO frequencies is off by
10 Hz one way or the other.
This change from 0.7 makes no difference in system performance -
you are merely correcting for a small discrepancy in 765 alignment.
However, if the correction is more than a few tens of Hertz, you probably
need to realign the BFO frequencies.
With the proper dial increment value in place, you can switch between
VFO-A and VFO-B and except for the few seconds it may take the AFC to
make its correction, you should get perfect copy while receiving in
either mode. Again, on average, you will almost always be within 5 Hz of
correct, centered tuning and that range will provide good print
throughout.
Should your rig drift about, you might find that you need to change the
actual frequency value you use as the "adder" but mine has remained very
constant at 0.7 since I last realigned it a few weeks ago. I should also
mention that my 765 stays on 24/7/365 as a precaution against drift and
in connection with some other activities. In any event, each time you set
up for another station, you will immediately find out if your adder is
correct, and if not what the correct one should be. Just use whatever
value gives approximately the same Rx Frequency values with CW Receive
and LSB Receive.
As a final disclaimer, please note that most if not all
micro-processor-controlled Icom rigs prior to the 765 change the dial
frequency reading by a fixed amount when the mode is changed. I know that
was true up through the 761. Obviously, the procedure given above would
have to be altered to take that dial reading change into account. Since I
do not have access to any other Icom rig, perhaps someone else can
pioneer one of the earlier Icom's for us.
I apologize for the length of this note, but I felt that more 765 owners
would feel confident to try this operating style if I provided a little
more than just a bare-bones "do this and then do that" procedure. I find
that the few seconds required to set up for a new station are well
invested in return for the capabilities provided by the narrow filters.
Please direct any questions to me privately unless you feel that others
might share your concern and would be interested in the answers. I
especially invite users of other makes of rigs to see how this procedure,
appropriately modified, works with their systems.
72/73, George AMA 98452 R/C since 1964
Amateur Radio W5YR, in the 53rd year and it just keeps getting better!
AutoPOWER Systems, Fairview, TX (30 mi NE Dallas) Collin County
QRP-L QRP-ARCI FISTS NORCAL ZOMBIE ARS 10-X 33.2 N 96.6 W EM13RE
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------------------------------
End of Psk31 Digest V1 #97
**************************
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