On May 30, 2007, at 8:50 PM, mch wrote:
Actually correction for half of the 'other 2400' and the other 1200 is
for data.
Joe M.
Ahh yes, oops. You got it right. Thanks Joe.
--
Nate Duehr, WY0X
Hi all,
Thanks for the many responses, but guess no one had the answer to my
question.
So I will try again.
I am interested in the parameters of the D-Star vs analog test. It
seems the testees had 2 receivers at a site, one D-Star and one
conviental analog and made a transmission on each
On Sat, 2 Jun 2007, Ron Wright, Skywarn Coodinator wrote:
My question was the rigs/power/antennas/etc the same on both. A test
of 10 W with D-Star and analog 1 watt HT does not address the issue.
I had hoped the D-Star rigs could be changed to analog making the only
difference the
What test are referring to? If you find some documented test results of a
real field test then please let us know otherwise I for one don't know what
test you are referring to.
And what do you mean had hoped the D-Star rigs could be changed to
analog? D-Star is a digital audio format, analog
Ron,
When you wrote I am interested in the parameters of the D-Star vs
analog test. Weak Signal D-STAR versus FM.mp3' file located within
the 'D-STAR Digital Audio' directory of the Illinoisdigitalham yahoo
group? If so, please forward a copy of your findings to me as well.
The
Nate Duehr wrote:
Bob Dengler wrote:
Sounds like DStar MAY have an edge over P25 Phase I, at least in terms
of
occupied bandwidth.
No-there won't be any difference in bandwidth, since the only difference
is how the bits are arranged. The modulation technique is the same. Just
like Motorola
On May 29, 2007, at 11:42 PM, [EMAIL PROTECTED] wrote:
At 5/28/2007 12:27, you wrote:
Also, as you pointed out, D-Star digital voice is a narrowband signal
occupying only about 6Khz vs. the 25Khz or so that amateur
repeaters have
often required to date. It is difficult to do a comparison
] On Behalf Of Coy Hilton
Sent: Monday, May 28, 2007 6:42 PM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] Re: D-Star demo
It would seem that I left out analog in none of the D-STAR
repeaters that I know of (ICOM) have the ability to do ANALOG FM
repeat. I'm not confused ..my
, 2007 9:28 AM
To: Repeater-Builder@yahoogroups.com
Subject: RE: [Repeater-Builder] Re: D-Star demo
I went to the D-star site and looked for dealers for ham radio, all I got
were commercial radio shops here in Cheyenne. Do they sell the D-star for
the commercial line as well?
Thanks
Dakota
No they don't however, Icom recently teamed up with Kenwood to develop and
deploy another new digital mode (as yet unnamed last I heard) that reportedly
operates within the new FCC ultra narrow 6.25Khz channel plan. An Icom America
representative recently told me that this new digital mode in
At 5/30/2007 01:10 AM, you wrote:
While the typical 50 dB analog NBFM (5 kHz deviation) bandwidth is
~20 kHz,
the 50 dB bandwidth of DStar appears to be about 10 kHz. Here in
SoCal
we're proposing 10 kHz channel spacing for DStar, digital P25 any
other
very narrow band digital
At 5/30/2007 07:08 AM, you wrote:
No they don't however, Icom recently teamed up with Kenwood to develop and
deploy another new digital mode (as yet unnamed last I heard) that
reportedly operates within the new FCC ultra narrow 6.25Khz channel plan.
An Icom America representative recently told
(Good luck finding test equipment that supports D-Star. Ever.)
I guess you weren't at Dayton.
Nope. Want to share?
So IFR, Motorola, or similar were there with a commercial service monitor
or something equal to that quality level, that had a D-Star mode?
--
Nate Duehr, WY0X
Bob Dengler wrote:
Sounds like DStar MAY have an edge over P25 Phase I, at least in terms of
occupied bandwidth.
No-there won't be any difference in bandwidth, since the only difference
is how the bits are arranged. The modulation technique is the same. Just
like Motorola Astro and M/A-Com
Discussion here locally is leaning toward 12.5 KHz spacing for what's
really needed for P25 Phase I systems, not 10 KHz. The discussion
was also backed up with tests of real-world BER (bit-error rate) at
closer and closer spacings (overlapping) by a local Amateur with
access to the
Bob Dengler wrote:
Sounds like DStar MAY have an edge over P25 Phase I, at least in terms
of
occupied bandwidth.
No-there won't be any difference in bandwidth, since the only difference
is how the bits are arranged. The modulation technique is the same. Just
like Motorola Astro and
Don't forget that only HALF of the D-Star's 4800 signal is used for
voice data, so you have effectively 2400 used for voice.
Joe M.
Nate Duehr wrote:
Discussion here locally is leaning toward 12.5 KHz spacing for what's
really needed for P25 Phase I systems, not 10 KHz. The discussion
What do they do with the other half?
On 5/30/07, mch [EMAIL PROTECTED] wrote:
Don't forget that only HALF of the D-Star's 4800 signal is used for
voice data, so you have effectively 2400 used for voice.
Joe M.
On May 30, 2007, at 4:12 PM, DCFluX wrote:
What do they do with the other half?
On 5/30/07, mch [EMAIL PROTECTED] wrote:
Don't forget that only HALF of the D-Star's 4800 signal is used for
voice data, so you have effectively 2400 used for voice.
Joe M.
Forward Error Correction, I
Actually correction for half of the 'other 2400' and the other 1200 is
for data.
Joe M.
Nate Duehr wrote:
On May 30, 2007, at 4:12 PM, DCFluX wrote:
What do they do with the other half?
On 5/30/07, mch [EMAIL PROTECTED] wrote:
Don't forget that only HALF of the D-Star's 4800 signal
At 5/30/2007 13:54, you wrote:
(Good luck finding test equipment that supports D-Star. Ever.)
I guess you weren't at Dayton.
Nope. Want to share?
I wish I remember more of the details, but the best I remember it was not a
commercial unit in the usual sense, but rather something that one
At 5/30/2007 14:03, you wrote:
Discussion here locally is leaning toward 12.5 KHz spacing for what's
really needed for P25 Phase I systems, not 10 KHz. The discussion
was also backed up with tests of real-world BER (bit-error rate) at
closer and closer spacings (overlapping) by a local
At 5/28/2007 12:27, you wrote:
Also, as you pointed out, D-Star digital voice is a narrowband signal
occupying only about 6Khz vs. the 25Khz or so that amateur repeaters have
often required to date. It is difficult to do a comparison between a
While the typical 50 dB analog NBFM (5 kHz
This brings some questions to mind. none of the D-STAR repeaters that
I know of (ICOM) have the ability to do FM repeat, If the repeaters,
antennas and the rest of the equipment weren't the same or nearly the
same and coo-located how can the test be fair? Also the D-Star is
narrow band with
I too have tried to find out what equipment was used during the Weak
signal D-STAR versus FM.mp3 demo which is posted under the Files
sections of the Illinoisdigitalham yahoo group. I too first
inquired to Mark (WB9QZB), he had then asked me to contact John
(KC5ZRQ) directly. I received
If you want a fair test, find a P25 machine and barrow a radio. The
P25 machines have the ability to do mixed mode (that is conventional FM
and digital) and would be a better machine to compare digital versus
analog on the same frequency using the same infrastructure.
Dan
KA8YPY
On May 28,
You mean analog audio vs. digital audio, both are conventional FM in this
application.
Gary
Dan Blasberg wrote:
If you want a fair test, find a P25 machine and barrow a radio. The
P25 machines have the ability to do mixed mode (that is conventional FM
and digital) and would be a better
Coy,
it seems you are confusing technologies here. D-Star repeaters and the
analog repeater systems you are accustomed to are all FM and all
conventional. D-Star is a digital audio format, that's all. It still
operates on an FM carrier. What I think you mean to say is that the D-Star
repeaters do
duh..sorry, yep meant analog vs digital audioIt would help if I
wake up before I respond.
Dan
KA8YPY
On May 28, 2007, at 2:51 PM, Gary wrote:
You mean analog audio vs. digital audio, both are conventional FM in
this
application.
Gary
Dan Blasberg wrote:
If you want a fair test,
It would seem that I left out analog in none of the D-STAR
repeaters that I know of (ICOM) have the ability to do ANALOG FM
repeat. I'm not confused ..my fingers drop words at times;-)
I was in paging for many years we did both...ANALOG and digital
paging FSK NRZ...but D-STAR uses GSM,
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