[d-star] Fw: More on Analogue Radio D-STAR Adaptor Using UT-118

[Doug Reed]

That is interesting. It sounds like any radio with a 9600bps data port 
should probably work. Although I expect it would be best if the radio in 
question has the high-accuracy TCXO mod from the manufacturer. One thing 
I noted about the D-STAR radios is that most of them are around 2 to 
4PPM accuracy. The cheaper ones were out to around 20PPM. In contrast, 
the old crystal controlled radios were usually spec'ed at 50PPM. The 
technical specs we use for amateur-grade FM voice repeaters recommends 
20PPM or better but allows 50PPM frequency stability. That means a 
D-STAR radio is 10 to 20 times more stable and accurate than most FM 
voice repeaters. We've known for a long time that 9600bps radios need to 
be very accurately tuned for reliable decode. I would bet that D-STAR 
will turn out the same.

73, Doug Reed, N0NAS.

.005% = .000050 = 50 Parts Per Million
.002% = .000020 = 20 PPM
.0002% = .000002 = 2 PPM

Mark Thompson wrote:
> Analogue Radio D-STAR Adaptor 
>
> using Icom UT-118 
>
> http://d-star.dyndns.org/rig.html.en 
>
> ----- Forwarded Message ----
> From: jk1zrw <7m3tjz at jk1zrw.ampr.org>
> Sent: Thursday, October 25, 2007 7:45:00 PM
> Subject:  Re: UT118 Adaptor
>
> Hi Yuki & Brad,
>
> --- In dstar_digital at yahoogroups.com, "Brad Rehm" <bradrehm at ...> 
> wrote:
>
>   
>> I found your project very interesting, and I'm surprised to see
>> that you were able to interface the UT118 to an FT-817.  I know 
>> the radio has a "packet" port, but I wasn't aware that it would
>> support a 9.6 kbps data rate.  Did you modify the radio in any 
>> way, or did you find that the data port would run at D-Star speed?
>>     
>
> The modulation of D-STAR is 4800bps GMSK with 0.5 BT.  So if your rig 
> has bandwidth(in AF, not RF) from 20HZ to 2400Hz(2600Hz is better 
> than 2400Hz.), you can use D-STAR with my adapter. (Usally, 9600bps 
> packet is used G3RUH. And the bandwidth of this modulation needs more 
> wide than D-STAR.)    
>
>   
>>  Does it work properly at both 2m and 450MHz?
>>     
>
> Yes, it works any band. Only requirement is AF bandwidth of your rig. 
> If SBB of HF has above requirement, we can use D-STAR in HF. (I ma 
> nore sure now.)  
>
>   
>> Also, have you tried to use your "adapted adaptor" with any other
>> radio?  The Yaesu 2 meter FT-2600, for example, also has a data
>> port.
>>     
>
> Yes, alredy we (I and my friends) tested IC-910, FT-817, FT-8000, and 
> TM833 and so on. But my adapter needs the adjustment of in/out audio 
> level for each rig. I check the manula of FT-2600.
>
> Packet Tx Data Input (9600bps): Typ. 800mV/600ohm 
>
> So you need the adjustment of audio level.
>
> Satoshi 7M3TJZ
>
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