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PA2AGA > HDDIG 13.09.00 20:20l 216 Lines 7447 Bytes #999 (0) @ EU
BID : HD_2000_249F
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Subj: HamDigitalDigest 2000/249F
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Sent: 000913/1703Z @:PI8HGL.#ZH1.NLD.EU #:13667 [Den Haag] FBB $:HD_2000_249F
From: PA2AGA@PI8HGL.#ZH1.NLD.EU
To : HDDIG@EU
Date: Tue, 12 Sep 00 23:00:16 MET
Message-Id: <hd_2000_249F>
From: pa2aga@pe1mvx.ampr.org
To: hd_broadcast@pa2aga.ampr.org
X-BBS-Msg-Type: B
The World Chip came in a huge 28-pin DIP. I suspect there wasn't enough
demand to offer it in a smaller surface-mount package, but the majority
of the bulk was the package, not the chip. The only technology that needed
"upgrading" was the packaging.
However, the TCM3105 modem is/was available in a small-outline, surface-mount
package and also uses a single +5V supply (unlike the World Chip which
requires a
negative supply as well which adds bulk to a product).
> But the TAPR 9k6 modem has a bunch of discrete stuff, the thing costs
> $80 for a kit - and the thing is HUGE! Are there now commercially
> available modem chips(or chipsets) that will do the job for 9k6 packet?
Sure there are commercially available modem chips for GMSK 9k6. MX*COM
makes several suitable chips. The TAPR design is kind of neat if you want to
learn how a 9k6 base-band modem works, though.
> The TAPR 9k6 modem works well. Evidentally, it works better than its
> predecessor the TAPR K9NG 9k6 modem(I believe it is based on the G3RUH
> design, which is superior). However, it is MUCH bigger, and much more
> expensive($80 vs. $35) than the old K9NG. Why didn't they just work on
> improving this design - getting the cost and size down? Now that
> handheld wireless is becoming a reality, and the need for small,
> inexpensive and reliable 9k6 modems is upon us again - TAPR is left to
> play "follow the leader", when they could have had a 5 year jump on the
> industry!
I don't believe the TAPR modem performance is *that* much better than that of
the K9NG modem, but TAPR's modem has a better interface to the TNCs.
The TAPR modem is similar in some respects to the G3RUH modem but lacks
a couple of features - the G3RUH modem permits pre-distorting transmitted
data to compensate for receiver distortion, and the G3RUH modem has a fairly
sophisticated clock/data recovery design. The pre-distortion feature was neat
for point-to-point links but not practical for the real multipoint world, the
clock
recovery scheme was good.
What good is a 5-year jump in the Amateur Radio packet industry anyway?
I don't know if you've noticed, but extrapolating 5 years into to the future,
there
may not be any packet radio products being made. Hams are kind of fickle when
to comes to experimentation and the simple fact is the the wireless
professionals
are *way* ahead of packet. The cold, hard truth is that hams were excited to
send
data at all and were totally hung up on the neatness of sending data, and
that's
not what is exciting. Services, what it does for you, are what is exciting,
and services
require an infrastructure and services architecture. Ham radio has the BBS
system,
DX Packet Spotting Cluster and APRS. The only service that benefits from
being done
via radio is APRS and that's remarkable because it is effectively a one-way
service.
Dana K6JQ
dana@source.net
------------------------------
Date: Mon, 11 Sep 2000 19:42:16 GMT
From: nomail@rob.knoware.nl (Rob Janssen)
Subject: TH-D7A secrets
Mike & Theresa M. <mike-n-terri@erols.com> wrote:
>Rob Janssen wrote:
>> Mike & Theresa M. <mike-n-terri@erols.com> wrote:
>> > Has anybody here in the states bought/built one of these 'yam' modems?
>> >I did not see any reference to a KISS mode, anybody have any more info
than
>> >what's at the site listed??
>> The YAM modem is a MODEM, not a TNC. Thus, the reference to a KISS mode
>> is irrelevant. It does modulate and demodulate the HDLC bits.
>> This is in fact a situation preferable over KISS.
> I guess I worded my question wrong. I did see drivers / etc. to be able
to
>setup and operate this 'modem' in different modes. I guess I should have
asked if
>there was a DRIVER available to operate in KISS mode. It seems to be a less
>expensive alternative to the TAPR modem and looks to be less components so
easier
>to assemble.
You would not operate it in KISS mode, but use a driver specific to the YAM
modem and the mode of operation you want.
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: Mon, 11 Sep 2000 14:09:05 -0400
From: "Carlos Portela" <cportela@simple-sw.com>
Subject: WTB: small, capable, multimode HF / VHF TNC
Hi All,
I am looking for a TNC that is small and capable. New or used. Price is
not a big issue.
It must be able to handle HF and VHF an all or most modes.
If you have any suggestions or one for sale please let me know.
Thanks in advance.
Carlos
------------------------------
Date: Mon, 11 Sep 2000 16:41:34 GMT
From: horseshoestew@my-deja.com
Subject: YAM modem at 2400bps? and other YAM questions
Has anyone played around with trying to get the YAM modem working with
Manchester-encoded 2400bps? The Flexnet drivers only support 1200 and
9600 operations. I don't know about the Linux drivers, but I would be
most interested in them as they come with source code!
Could the YAM be used at 2400bps with unmodified commercial ham
radios? This would avoid the problem of having to modify radios to
hook directly into the varactor and discriminator.
Is it best to order the YAM's from Nico Palermo's site?
http://www.microlet.com/yam/
Does the PCB come with all the discrete parts other than the FPGA? Is
it better to get the FPGA along with the modem, or just get the FPGA
here in the USA through someone like DigiKey?
If Nico's PCB doesn't come with discrete parts, is it possible to order
them thru someone else? The following site mentions that a kit can be
ordered:
http://www.infracom-fr.com/yamg.html
If Nico's PCB doesn't come with all parts, does this one?
I would really appreciate feedback on this.
What about the Surface Mount Device(SMD) version of the YAM modem:
http://www.qsl.net/dg1scr/pr/yam/index_e.html
What ever happened to this? I don't see anyplace to order it online.
------- Stewart - N0MHS --------
Wireless High-Speed Networking and
Public Radio Services Information(MURS,FRS,GMRS,ARS,CB):
http://www.pubcel.com
Sent via Deja.com http://www.deja.com/
Before you buy.
------------------------------
Date: Mon, 11 Sep 2000 12:43:10 -0500
From: "Charles Brabham" <n5pvl@swb.net>
Subject: YAM modem at 2400bps? and other YAM questions
<horseshoestew@my-deja.com> wrote in message
news:8pj1vp$n6j$1@nnrp1.deja.com...
>
>
> Could the YAM be used at 2400bps with unmodified commercial ham
> radios? This would avoid the problem of having to modify radios to
> hook directly into the varactor and discriminator.
>
4.8kb is better. There is a 4.8kb soundcard driver for FlexNet. Soundcards
are even cheaper than YAMS, and come pre-assembled, ready to go.
--
73 DE Charles Brabham, N5PVL
n5pvl@swbell.net
http://home.swbell.net/n5pvl/
------------------------------
Date: Mon, 11 Sep 2000 19:17:59 GMT
From: horseshoestew@my-deja.com
Subject: YAM modem at 2400bps? and other YAM questions
In article <UL8v5.195$d42.17954@nnrp3.sbc.net>,
"Charles Brabham" <n5pvl@swb.net> wrote:
To be continued in digest: hd_2000_249G
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