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PA2AGA > HDDIG 02.07.00 23:57l 198 Lines 7301 Bytes #-9413 (0) @ EU
BID : HD_2000_176D
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Subj: HamDigitalDigest 2000/176D
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Sent: 000702/1357Z @:PI8HGL.#ZH1.NLD.EU #:57650 [Den Haag] FBB $:HD_2000_176D
From: PA2AGA@PI8HGL.#ZH1.NLD.EU
To : HDDIG@EU
Date: Sun, 02 Jul 00 14:23:03 MET
Message-Id: <hd_2000_176D>
From: pa2aga@pe1mvx.ampr.org
To: hd_broadcast@pa2aga.ampr.org
X-BBS-Msg-Type: B
setting. Thus, I can see from about 14.070 MHz to about 14.073500 MHz.
Now, when I see a weaker station that I want to copy and there is a
strong station in the passband that is reducing gain through AGC action,
I just punch up a narrow filter, usually 100 Hz - (two keystrokes), and
use the IF Shift control to position the narrower passband directly over
the weaker desired signal. If the IF Shift range is inadequate, then I
grudgingly nudge the dial up 1000 Hz - but that occurs very seldom due to
the wide shift range of the Kachina.
With the panoramic frequency display of DigiPan or WinPSK or Zakanaka (my
current favorite) you can immediately see the effect of the translated
passband and position it very accurately. There is no need to retune the
radio or "touch that dial."
To return to "normal" operation requires only a keystroke or two to zero
out the IF Shift and return to the 3.5 KHz filter.
The remarkable new paradigm of this class of PSK31 program has made it
possible to perform almost all frequency operations in the software of
the control program. It has made it possible to use radios with 100 Hz or
even 1000 Hz tuning steps to be used very successfully on PSK31.
I sometimes chuckle that one of my motivations for getting the Kachina
last year was to take advantage of its one-Hz tuning step capability and
its remarkable frequency stability (seldom more than 2 Hz off of WWV).
About the time I got the radio, DigiPan and the others came out and with
them, the necessity for critical radio tuning went out the window. But, I
still enjoy all the other neat features of the Kachina that no other
radio, so far, has been able to offer.
Enough of Kachina drum beating! Sorry about that . . . but you really can
operate PSK31 without hardly ever touching the radio dial.
I agree with Bob that PTT operation is preferable for many radios. I use
VOX with the Kachina since it appears to work perfectly and does not
introduce any compromises in signal quality. As Bob points out, though,
you have to be careful to turn it off when not operating PSK31, or a lot
of sounds may get out over the air. Again, the Kachina is a big help
here: it allows 8 different complete station setups to be programmed and
selected with F1-F8. I have 20-meter PSK31 set up on one key with VOX,
and all the others for other bands and modes without VOX - saves me
having to remember! ;^)
72/73, George
Fairview, TX 30 mi NE Dallas in Collin county
Amateur Radio W5YR, in the 54th year and it just keeps getting better!
R/C since 1964 - AMA 98452 RVing since 1972 Kachina #91900556
Bob Lewis wrote:
>
> > would like to hear your comments on which program you
> > find best for which PSK-31 application
>
> I suppose you'll get many opinions on that - software is changing all
> the time. My personal preferences are DigiPan and WinPsk. Both have a
> very nice user interface. DigiPan has the advantage of displaying a
> "slice" of the band if you use wide receiver IF filters. You can then
> see all the signals in that "slice" displayed and click on any one to
> print it. The disadvantage of using a wide receiver filter is that
> your receiver AGC can be subjected to strong signals in the wide
> passband. Using a narrow filter in the receiver IF protects the
> receiver AGC from signals outside the narrow passband but now you have
> to tune in PSK signals with the receiver's tuning knob instead of
> clicking on them with the mouse. If I'm using narrow filters then I
> prefer WinPSK over DigiPan mainly because the smaller waterfall
> display seems better suited to the narrower IF.
>
> > Also, what seems to be the best method for keying, using
> > the computer's serial port or the rig's vox?
>
> I'd highly recommend PTT via the serial port. Some rigs work fine with
> VOX and some overdrive the audio in order to get reliable VOX keying.
> An additional problem with VOX can be that you forget to turn it off
> and end up sending all those nice computer sounds over the air. With
> PTT the computer sounds don't get transmitted because the PSK software
> does not key the rig.
------------------------------
Date: Fri, 30 Jun 2000 12:35:37 GMT
From: Den <dennis.spiess@reckitt.com>
Subject: Field day review (MixW rocks)(TrueTTY OK too!)
In article <395c3e08.5084445@news.earthlink.net>,
kf4sir@earthlink.net (Dale Coleman) wrote:
> Hi all, I had an interesting field day.
>
> Tried to run PSK31 at club site and due to major problems with QRM
> that I feel were not any fault of PSK31. I packed up my station and
> setup at home running 1E.
. . .
>
> Dale KF4SIR
I ran a digital all band station for the W2SE 11A effort in NNJ using
TrueTTY on PSK and RTTY. I had the same experience, the other station's
QRM (especially the 20M CW station!)at the site destroyed PSK. It has
NO tolerance for any background QRM! Traditional RTTY did much better
hearing through the noise. ended up with 65 Qs between the two modes,
most on RTTY on 20M.
When the QRM was down PSK worked great!
Ran 50 w into a ladder line fed 80M dipole @ 50 feet from a TS440 thru
a homebrew SPC tuner / 4:1 balun.
Will do it again next FD but will get as far away from the 20M CW
station as I can !!!
73
Den Spiess W2DEN -.-
Sent via Deja.com http://www.deja.com/
Before you buy.
------------------------------
Date: 1 Jul 2000 02:06:31 GMT
From: "Charles T. Young" <ctyoung@mtu.edu>
Subject: how does PSK31 really work?
I would like to know a couple of things:
How does PSK31 really work? Is it an ascii character set? How
is the modulation accomplished?
I have heard that DSP functions are present in a sound card.
Can someone tell me some more about that? Besides knowing how it
is used in PSK 31, I have another job for it. I want to do signal
averaging in the time domain. Another thing I would like to be able
to do is synchronous detection.
Anybody out there have any ideas on these questions? Could you please
send a reply to my email address? I look at that a lot more than
these newsgroups.
Thanks
Chuck KF8TI
ctyoung@mtu.edu
------------------------------
Date: Fri, 30 Jun 2000 13:34:45 -0400
From: "Mark Flanagan" <markf@cshore.com>
Subject: Icom 706 and Soundcard
Does anyone have the correct wirring to connect a sound card to the Icom
accessory port for mic, ptt, audio and ground?
Thank you,
--
Mark Flanagan, K1MKF
k1mkf@qsl.net
http://www.qsl.net/k1mkf/
------------------------------
Date: 01 Jul 2000 10:25:59 GMT
From: compcnsult@aol.com (CompCnsult)
Subject: NEW AMATEUR RADIO WEBSITE!
Please visit my NEW AMATEUR RADIO WEBSITE!
http://www/callingcq.com
Please post items for sale, wanted, clob info, links to your
personal web pages, etc. All FREE! Also please sign the guestbook!
Until I finish the submit item pages just send me an email to:
callcqweb@aol.com
Thanks
Chuck
W0CBF
------------------------------
End of Ham-Digital Digest V2000 #176
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