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PA2AGA > HDDIG 13.11.99 01:27l 155 Lines 5457 Bytes #-9686 (0) @ EU
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Subject: HamDigitalDigest 99/289B
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24 chans) and 1 200Khz Channel for high speed on 70cm. In the more dense
populated areas here all channels are in use. So the users can distribute
themselfes between the 9k6/1k2 user access, so that every access has at
max 10 simultanous Users. This is more effective than having 50 stations
on a single accesspoint, because there is lower probability for collisions.
And the more ambitious hams can use the high speed channels.
(which are rare currently, i have to admit). And most users donīt do packet
because they are interested in packet, but because they use it as information
source (DXClusters, convers, and bbs are very popular). For them 9k6 _is_
sufficient.
>> there is only one channel for this bandwidth on 70cm. Interlinks with
>> 76k8 are quite common, there are at least 15 of them. A very nice example
>> is DB0HUN which has 2 interlinks on 6cm, distance 23km and 68Km, running
>> at 76k8, no user access. On weekends there are usually abt 100-160 Qso
A
>> routed via this node, transferring about 500 Kbytes in 10 minutes.
>> The problem is, that there isnīt enough traffic to get those nodes to
>> their limits :-).
> with 9600 baud user links, I'm not surprised. In any case, I would like to
> speak with (email with? :-) folks running higher speed nodes to see if we
> can transport some of the technology to here in the states.
As I said, this node has no user access at all. It is a pure backbone node.
But
the user-accesspoints which are not more than 2 hops away accumulate to about
200Kbit/s (or more). So it is possible to saturate this node, but not with
those user profiles. There are applications such as FlexIP (tcp/ip for win) or
FlexTalk (Voice over ax.25) which are easy to install but people seem more
interested in huge, worthless discussions in bbs boards such as "debate". ;)
Most bbs here are Baycom BBS which you can access using http, nntp, smtp
and pop3. But people seem to like "good old packet" more than netscape. Donīt
know why.
If you are more interested in the technical details, have a look at
http://www.adacom.org. There are DF9ICs slides from various talks (everything
in German, sorry). And if you click at "Digi-Bilder-CD" you can access the
adacom-CD which contains layouts for modems and the 23/6cm-trxs as well as
EPROMS
and GALS for the various modems. There are pictures and data sheets of many
German nodes too, although a little outdated (end of ī96). And you can view
the front pages and table of contents of all "Adacom Magazin" which is the
medium where most of the concepts we are using here are published. (In German,
again).
- Hans-Peter
--
Hans-Peter Zorn *** eMail uhsm@rz.uni-karlsruhe.de
>.
------------------------------
Date: Thu, 11 Nov 1999 18:16:33 -0600
From: "Steve Sampson" <ssampson@usa-site.net>
Subject: German packet radio
Eric S. Johansson wrote
>Now, if one was to keep the deviation low and the consumed bandwidth
>smaller in relation to the filter, would that not help compensate for
>the drift?
Yes, but there is a trade-off. Think of your voice system through a repeater.
Running a low deviation means that others can barely hear what you have to
say. Also, little pops and cracks in the audio circuits themselves become
just as loud or louder than your voice (or data).
>Another way of asking the question is if the band pass filter is
>larger than the possible drift of the signal, would you still have the
>same problems with high bit error rate?
Yes, because the signal to noise ratio is lower in an underdeviated signal.
There's probably a chart somewhere (I'm not that much of an expert) that
shows the optimum deviation. I suspect it should be at an index slightly
greater than one, or about 6 sidebands of the modulating frequency.
Steve
>.
------------------------------
Date: Mon, 8 Nov 1999 07:56:17 -0700
From: "Gordon Yarte" <GYarte@worldnet.att.net>
Subject: PSK31 PROBLEM W/SOUND CARD
Please cancel my ad. Thanks
>.
------------------------------
Date: Thu, 11 Nov 1999 22:05:54 -0600
From: Amarpreet Singh <russi@worldnet.att.net>
Subject: vx-5R and cellular reception
YEp, Thats what they say, But I am pretty sure someone out there know
how to configure that.
Let me know if you come to know about it or any info. I will do the
same.
Russi
donmichaelo@hotmail.com wrote:
> I have heard that the cellular band which is blocked CAN NOT be
> restorable in the VX-5R....Is that true??
>.
------------------------------
Date: 11 Nov 1999 22:01:15 GMT
From: jdy18@aol.com (JDY18)
Subject: WTB Model 15 teletype
A friend who works for the AP in central New Jersey wants to borrow or buy a
Model 15 teletype machine for demonstration purposes. Must be in good working
order. If you still have one of these boat anchors, please let us know.
thanks,
Jay
W2KD
>.
------------------------------
End of Ham-Digital Digest V99 #289
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