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PA2AGA > HDDIG 24.03.00 10:14l 221 Lines 7451 Bytes #-9536 (0) @ EU
BID : HD_2000_83D
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Subj: HamDigitalDigest 2000/83D
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Message-Id: <hd_2000_83D>
From: pa2aga
To: hd_broadcast@pa2aga
Subject: HamDigitalDigest 2000/83D
X-BBS-Msg-Type: B
>Will pass six frames in connected mode, but only two at a time unconnected.
Maybe this is by design. I think the limits are a bit low, but you
certainly need to have those limits.
(I use something like 20+maxframe for connected, half of it for datagram)
>> Stupid TCP options like "no backoff" or "linear backoff" have been built
>> into some versions of NOS. This is lethal in any network environment
>> where hop-to-hop retries exist.
>Yes, something to be avoided at all cost! Can bring a NET/ROM network
>down in short order. Perhaps this is one reason tcp/ip has such a bad
>reputation in some areas (smile).
Sure. The problem was that the "inventors" of this stupidity (Mike
B. etc) would not listen to theoretical arguments from Phil and others,
but just went ahead.
>> There exists a German hack to send IP frames in normal pid-F0 packets.
>> It relies on packets being correctly re-assembled in the presence of
>> network level fragmentation. To assure this, the effective packet length
>> must be set very small, making it a very ineffective protocol.
>> (I think they recommend 88 byte MSS to have packets <= 128 bytes)
>Not so good. I may play with some ip-over-nr that uses NET/ROM
>connections to see how well that works. i.e. encapsulate in pid-CF frames.
But that can only work when you define a new protocol or the endpoints
agree that all traffic towards them is IP. The PID is not transported
in NET/ROM connections :-(
There will be not much difference anyway, unless you are using multi-hop
NET/ROM connections. With a single end-to-end connect the packets between
the nodes are datagrams anyway.
Rob
--
+----------------------------------+--------------------------------------+
| Rob Janssen pe1chl@amsat.org | WWW: http://www.knoware.nl/users/rob |
| AMPRnet: rob@pe1chl.ampr.org | AX.25 BBS: PE1CHL@PI8WNO.#UTR.NLD.EU |
+----------------------------------+--------------------------------------+
>.
------------------------------
Date: Sun, 19 Mar 2000 14:29:55 -0600
From: Charles Fregeau <n5hsr@sprynet.com>
Subject: Open bands last night.
I don't have an HF rig right now (drat and double drat) but was
listening to 13 meter short-wave (right next to the 15 meter ham band)
and was hearing stuff from Ecuador at about 05:30 GMT this morning here
in Chicago. Were the bands that wide open? I listened to 10 meters and
didn't hear a thing, though.
Charles R
N5HSR/9
>.
------------------------------
Date: Wed, 22 Mar 2000 10:17:47 -0500
From: junglejim <junglejim@deltacomm.com>
Subject: Opto APS-105 and RS232 ?
I'm trying to connect an Opto APS-105 to an OptoLinx. Opto customer
support tells me I have to use the "Scout" port on the OptoLinx. Anyone
have any experience connecting the 105 to a computer?
Thanks for your time,
junglejim
>.
------------------------------
Date: Thu, 16 Mar 2000 13:48:21 GMT
From: POSSUM BELLY ASSHOLE <one.big.asshole@ahole.com>
Subject: Packet on FRS?
'Please' read the rules for FRS....
horseshoestew@my-deja.com wrote:
>
> Has anyone done 1200bps or 9600bps packet on FRS or GMRS? The radios
> have MIC and SPEAKER connections.
>
> This would be a cool use for all those 1200bps TNCs gathering dust in
> the corner. Heck, you don't even need a TNC - most computers come with
> a sound card that should be able to do 1200bps packet. Kids would DIG
> being able to use their home computers to send e-mail over their FRS
> radios to other kids in their neighborhood. A few folks could set up
> some GMRS digipeaters or nodes and link a whole community! A GMRS base
> station could be a gateway to the Internet for those that have 24hr
> Internet access in their homes. Many possibilities exist here. And it
> wouldn't cost hardly anything!
>
> It will really freak the kids out to hear those packet tones on their
> FRS radios. Totally cool.
>
> Stewart Teaze - N0MHS
>
> Sent via Deja.com http://www.deja.com/
> Before you buy.
>.
------------------------------
Date: Thu, 16 Mar 2000 13:53:51 GMT
From: POSSUM BELLY ASSHOLE <one.big.asshole@ahole.com>
Subject: Packet on FRS?
horseshoestew@my-deja.com wrote:
>
> In article <8aoqg9$5o1$1@nnrp1.deja.com>,
> horseshoestew@my-deja.com wrote:
> > In article <1zRz4.4195$511.1252346@tw11.nn.bcandid.com>,
> > "Rick Ruhl" <ricker@cssincorp.com> wrote:
> > > I remember in the FCC rules that only voice was permitted on the FRS
> > > frequencies. We looked into it a while back to find out of we could
> do
> > a
> > > low cost FRS paging service.
> >
> > What about packet on GMRS? Is it permitted?
> >
>
> Forget it - I found the answer....
>
> 95.627 Emission types.
>
> (a) A GMRS transmitter must transmit only emission types A1D, F1D, G1D,
> H1D, J1D, R1D, A3E, F3E, G3E, H3E, J3E or R3E. A non-voice emission is
> limited to selective calling or tone-operated squelch tones to establish
> or continue voice communications. See 95.181(g) and (h).
>
> (b) [Pertains only to the Radio Control Radio Service.]
>
> (c) [Pertains only to the Citizens Band Radio Service.]
>
> (d) No GMRS or CB transmitter shall employ a digital modulation or
> emission.
>
> (e) No GMRS. CB or R/C transmitter shall transmit non-voice data.
>
> Bummer... What we COULD do with digital... Damn Qualcomm.
Well you have plenty of space on the amateur bands. What's holding
you?
>
> Sent via Deja.com http://www.deja.com/
> Before you buy.
>.
------------------------------
Date: Wed, 22 Mar 2000 19:56:39 -0600
From: Cal Kutemeier <ckuter@ix.netcom.com>
Subject: PSK31 on Laptop PCMCIA Sound Card
John, I started on PSK with a IBM 755CSE DX/4-100 with 8 meg of ram.
Upgraded to 40 meg of ram and am still using W3.1. May upgrade to W95
to try digipan. Using PSK31WSB v. 108. Works great, even of 8 meg of
ram.
JOHNL84238 wrote:
>
> I have a Compaq Contura (486-100Mhz) laptop, which does not have a sound
card.
> I am thinking of adding a PCMCIA sound card (Eiger Labs or equiv) to
> get on PSK31. Has anyone out there successfully used a PCMCIA soundcard
> with a laptop, especially a 100 Mhz 486 laptop, and been successful at
> operating
> PSK31?? I 'd like to know if it will work before I buy the sounds card.
> Thanks,
> John
>.
------------------------------
Date: Wed, 22 Mar 2000 19:54:50 -0600
From: drbadboy@hotmail.com (Badboy2)
Subject: Satellite Cable Length
""""Please forgive me if this is the wrong place to post""
This may be a stupid question but I would like to know if the RG-6u coax
length would make any difference in the signal strength of the DSS
SATELLITE and HUGHES DIRECPC SATELLITE if so does anyone know how each
should be configured so I might get a stronger signal Please e-mail me.
Thanks in Advance
>.
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End of Ham-Digital Digest V2000 #83
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