[d-star] Fwd: Re: [illinoisdigitalham] D-STARHigh-Speed 1.2 GHz 128 Kb IP Data

[Mark]

--- In illinoisdigitalham at yahoogroups.com, "Tom Azlin, N4ZPT" 
<tom at ...> wrote:

Hi.

Last year a group of us purchased about 9 ID-1s in Northern
Virginia/Washington DC metro area getting one of the free access 
points
along the way. We used the Access Point and the ID-1s in a demo at 
half
of the Aid Stations in the marathon in the DD mode to provide 10-20
times the bandwidth and capability than in the past. We used 1200 and
9600 bps packet in the past. We had ID-1s at the other half of the 
AID
Stations but had a combination of path problems, laptop configuration
problems, and radio setup problems but getting half working was
considered a good first step and the medics were happy as we were 
using
9600 bps packet as primary using TM-D700As at the AID Stations and an
IC-208H/KPC-9612+ at the commo hub.

You should find the ID-1 and DD mode very useful. We did learn that 
we
had to be careful with how our laptops were set up, that we had to do
quality training of the hams at the aid stations, and that 23cm
propagation was not as bad as we had feared but could present 
problems.
 We did not use the DV mode in the marathon thought we did conduct 
some
simplex DV testing around the course.

We also had considerable help from Icom America (loaner radios) and 
the
Texas Interconnect Team (23cm Yagi antennas) in getting it all 
working.
 We are very appreciative of that help.

We will start this year with the ID-1s in DD mode as primary and 9600
bps packet as a back up.

73, Tom n4zpt
Packet Coordinator
(2006 Marine Corps Marathon Ham Radio Team)

Mark Thompson wrote:
> Hank - 
> 
> Although you can do both digital voice & slow-speed ansynchronous 
data with the 1.2 GHz ID-1 radio, the ID-1 also has the capability 
to do half-duplex 128 Kb IP data using the 130 KHz wide channel. 
> 
> The high-speed IP data capability is very interesting and some of 
us in the Chicago area are close to buying some ID-1s & start 
testing them. 
>  
> 73, Mark, WB9QZB
> Chicago, IL
> 
> 
> ----- Original Message ----
> From: Hank Greeb <n8xx at ...>
> To: illinoisdigitalham at yahoogroups.com
> Sent: Monday, January 15, 2007 4:22:15 PM
> Subject: [illinoisdigitalham] I agree, but lettuce stop "hyping" 
D* so continually
> 
> 
> Mark:
> 
> You have a good point, but there are many folks who are "hyping" 
the not 
> so novel D*.  I believe that perspective is required from time to 
time.
> 
> I have nothing against D*, I just don't see much advantage for it 
in the 
> VHF/UHF spectrum, since it only provides a few dB improvement over 
the 
> very poor performing FM, and is inferior by many dB and wastes 
more 
> spectrum in comparison to the tried and true SSB.
> 
> Now, on 1.2 GHz, there might be some advantages. Is Icom (or 
another 
> vendor) coming up with TCP/IP (or AX.25) or ?? over the D* 
asynchronous 
> 128 Kb channel?
> 
> 73 de n8xx Hg
> 
> Mark Thompson wrote:
> 
>> Icom claims D-STAR's slow-speed data in the digitial voice radios 
has 
>> an effective rate of 950 bps. With D-STAR you do not need an 
>> additional TNC as you do with packet radio. However the slow-
speed 
>> data is ansynchronous data with no forward error correction and 
no 
>> retries. Consquently, you need to have some type of software 
running 
>> on each end to handle the data transmission. In addition, D-STAR 
>> digital voice radios automatically support the connection of 
external 
>> GPS units to transmit callsign & GPS coordinates over slow-speed 
data 
>> without the need for a TNC.
>>  
>> The street price of the mono-band IC-2200H 2m mobile with the D-
STAR 
>> board is about $350 and the dual-band 2m/440 ID-800H mobile is 
$580. 
>> Of course you get digital voice capability in addition to the 
slow 
>> speed data.
>>  
>> I really think we need to quit comparing how one mode will 
replace 
>> another and instead discuss how we can use all of the modes we 
have 
>> most effectively depending on the situation and yet still be 
curious 
>> enough to adopt new technologies as they appear & evolve.
>>  
>> 73, Mark, WB9QZB
>> Chicago, IL
> 
> 
> 
> 
> Yahoo! Groups Links
> 
> 
> 
> 
>  
> 
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--- End forwarded message ---