[amsat-bb] Re: DSTAR vs AO-51

[Luc Leblanc]

On 27 Apr 2009 at 6:42, Tony Langdon wrote:

> At 01:31 AM 4/27/2009, Luc Leblanc wrote:
> 
> >I was asking a question only to know if as AO-27 DSTAR can be pass 
> >through AO-51. I guess the answer is yes as per your offer to ask for it
> >in the monthly schedule? I choose this the last days of V/S mode to 
> >avoid "messing" with analog users.
> 
> I'm not sure that V/S is a good idea, with the extreme Doppler 
> shift.  Take Drew's suggestion and get some time scheduled on the 
> second transponder for D-STAR (preferably on mode V/U).  Having it in 
> the schedule means the rest of the world can give it a try as well. :)
> 
> 73 de VK3JED / VK3IRL
> http://vkradio.com
> 
> 
That's exactly what i discover compensating for doppler in 5kc steps is probably not enough on on the downconverter IF it puts the signal 
too much in the on an off state having to play back and forth with the knob.  My problem is a rig limitation i'm stuck with a monoband 
DSTAR radio making it useless on V/U mode. The only one way is to find a way to convert UHF to VHF in the 144mhz region to avoid desense. 
As far i remember it is far from an ideal solution but i think some are able to do it?

I note Drew's offer but due to my rig limitation i will not be able to use it. This don't mean if someone else with a DSTAR dual band 
want's to try i will not try to uplink few data stream but i will not be able to hear myself :(

Again with what i have here S mode can work as i will only have to change my Down Converter IF from 123mhz to 145mhz that can be done 
easily with but the 5kc steps issue. On some rig the steps are adjustable i don't know if the IC2200H can do that as the menus settings on 
this rig is probably the worse i never seen yet. You have to have  manual always with you...

P.S. I don't know why nobody never speak about DSTAR here on this BB as some are avid data satellites advocate and DSTAR can transmit APRS 
signal called DPRS plus voice at the same time even slow data messages? Is two DSTAR modules plus a controller unit operating cross band 
flying aboard ISS is possible? With an high speed data 1.2ghz module is it possible to have fast internet access from space? Tapping in the 
next internet ISS lan system? I'm guessing Icom can be interested to offer the hardware if it's to be flown aboard ISS!!
In bonus it will offer some spare/off time activities for the next 6 members crew. Could be ARISS can be interested too?

"-"


Luc Leblanc VE2DWE
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