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PA2AGA > HDDIG 11.12.99 17:46l 233 Lines 7820 Bytes #-9654 (0) @ EU
BID : HD_99_311C
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Subj: HamDigitalDigest 99/311C
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Date: Fri, 10 Dec 99 20:08:33 MET
Message-Id: <hd_99_311C>
From: pa2aga
To: hd_broadcast@pa2aga
Subject: HamDigitalDigest 99/311C
X-BBS-Msg-Type: B
people talk about RC (raised cosine), then they mean raised cosine in
the TIME domain, so 2-RC is a raised cosine that spannes over 2 symbols.
The G3RUH baseband modem also features a raised cosine impulse, but in
the FREQUENCY domain...) .
The later realized "real-world" modem was unfortunatly worse than the
simulation (of course, this is what you expect the "real-world" to be),
but it still was quite good compared to the "simple" case with only a
linear post-detection filter (G3RUH/DF9IC type modems). There is still
room for improvement for this DSP based modem, but I have no time in the
moment...
73=B4 Alexander
=
-- =
*----------------------------------+-------------------------------------=
--*
| Alexander F. Kurpiers | Voice:
+49-6151-162369 |
| Institut fuer Nachrichtentechnik | Fax :
+49-6151-165545 |
| Merckstrasse 25 | EMail:
a.kurpiers@uet.tu-darmstadt.de |
| D-64283 Darmstadt (Germany) | Hamradio:
dl8aau@db0ais.#hes.deu.eu |
*----------------------------------+-------------------------------------=
--*
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>.
------------------------------
Date: Fri, 03 Dec 1999 10:51:09 -0500
From: Dave <floydboyz@hotmail.com>
Subject: good 9k6 pkt rig ?
a friend of mine picked up a couple of them @ the rochester ny
hamfest,earlier this year.they only put out 35 watts,he says' that it is
a simple mod.thats' all i know/can
tell you.
ttyl de dave
>.
------------------------------
Date: Fri, 03 Dec 1999 21:39:39 -0500
From: Dave <floydboyz@hotmail.com>
Subject: good 9k6 pkt rig ?
here is the 'mod' page:
http://www.packetradio.com/phnx96.html
the home page:
http://www.sedan.org/
ttyl de dave-n2rhl
>.
------------------------------
Date: Sat, 27 Nov 1999 14:52:14 -0500
From: "Rob" <NoEmail@NoWay.com>
Subject: good 9k6 pkt rig ?
Hi Cathryn,
I am curious. What type of antenna do you use and at what height?
Can you use the TEKK1000 on a 70cm freq with an offset (eg +5)?
I also notice it only has 5 watts out or so. If you need more power, can
you connect up an amplifier to the TEKK 1000 and still use it for 9600 baud
packet?? Or will an amp slow down the TR switching making 9600 baud packet
impossible?
73's
Rob
"Cathryn Mataga" <cathryn@junglevision.com> wrote in message
news:%Cp%3.1493$LK3.57743@nuq-read.news.verio.net...
> I like my TEKK 1000 from paccomm.com. It's extra tiny, and less
> than about $200 or so. I don't have any real measurements for
> how well it really works, but for me, I can connect to the
> station across the bay, about 30 miles line of site from me no problem
>
> "Dave" <floydboyz@hotmail.com> wrote in message
news:383DDD99.745BC278@hotmail.com...
> > What's a good 440mHz mono band rig for 9600 baud packet ?
> > Also needed to be taken into consideration is the modifications.
> > tnx de dave
> >
> >
>
>
>.
------------------------------
Date: Sun, 28 Nov 1999 09:00:44 -0600
From: "Steve Sampson" <ssampson@usa-site.net>
Subject: good 9k6 pkt rig ?
I have the same radio. K5HP in Oklahoma City has a 9600 repeater
on one of the TV towers. Basically he uses a repeater pair to make
it a coordinated frequency. I receive on 442.950 and transmit on 447.950.
I use an M^2 (M Squared) 11 el 70cm beam in my rafters pointed at it.
I just laid it across the cross braces of the roof. Works great when
the repeater is on frequency. One problem with those old radios used
in repeaters, is they require constant attention.
The 9600 repeater is built using the TAPR 9600 modem and it cleans
up any signal it hears. Since it repeats everything it hears, you don't have
to worry about hidden terminal problems.
I would also look at the hamtronics stuff: www.hamtronics.com
Steve
Cathryn Mataga wrote in message ...
>Okay, my antenna is one of those Cushcraft dual band yagis. It's
>like $69 or something. It's on an archerotor, that's on
>2 5 foot masts on the roof. Maybe 25 feet off the ground in the
>flats of Berkeley, which is a slight grade to the SF bay.
>Though lately, I've had the antenna pointed one way all the time,
>so I'm thinking of fixing that beam on another mast I have, and
>using the rotor for something else. Except it's just too cold to
>mess with it, nowadays.
>
> w6yx in Palo Alto, has a pretty good site, I understand
>on side of Black Mountain, that looks over most of the East Bay and South
>Bay, as I understand it.
>
>I'm pretty sure paccomm can put in crystals for whatever pair you want.
>So, the split should be no problem.
>
>Seems to be the common wisdom, that putting amps on 9600 baud
>channels isn't such a good idea, since the T/R switching slows things
>down -- though I'm just repeating what I've read and heard from others
>around here. I have considered running more power, though, to avoid
>'hidden transmitter' issues with stations farther south in San Jose. That
>is I want to blast out enough juice to keep their carrier detect going,
>even if they don't copy me. Though right now the channel is pretty quiet,
>so this isn't a huge issue.
>
>I think, if you want more power, the way to go is with the Mitek's err,
>I forget the other brand that people modify, but these guys put out
>near 80 watts.
>
>
> I do know that the station on other end runs 3 watts into
>a vertical, and I was initially worried about this, being 30 miles
>away and all, but it seems to basically work. I initially planned
>to move the radio up on the mast, if I had any trouble, figuring I'd
>eek out a db or so, saving the 9913 transmission line loss, but since
>it works where it is, I never bothered. The radio is tiny enough,
>it'd be easy enough to make a plastic box, and stick it up there.
>.
------------------------------
Date: Sat, 04 Dec 1999 11:12:52 -0600
From: Richard Kriss <kriss@spec.com>
Subject: Help Needed tuning a FSK Signal for HF Packet
I am having trouble working HF packet. The setup is a PK-232 and a
Kenwood TS-450. For reasons I would rather not discuss the Kenwood is
worthless in AFSK mode so I must use FSK. I want to work the NETWORK
stations on 14.105 MHz. The problem is when in FSK mode I print 99% of
the stations on 14.103.33 MHz. This is the frequency I have locked into
memory. The problem is the stations do not seem to hear my FSK signal
that is transmitting on 14.103.33. I have tried to use the XIT to move
my xmit up 1.1 and they still can't hear my station.
Any suggestions on how to put an FSK signal on freq will be appreciated.
73 de Dick , KD5VU
Austin, Texas
On Saturday, December 4, 1999 at 11:02:57 AM CST (or -6hrs UTC)
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