> Its my understanding that when multiple simultaneously running applications > are using the soundcard with different sampling rates, that Windows delivers > a compromise sampling rate. Thus comparisons run on the same PC may not > accurately reflect each application's performance in isolation. >73, Dave, AA6YQ
Always wondered about that Dave. I ran several programs simultaneously while testing their ability to decode MT63 using an HF path simulator. It turned out that 3 out of the 5 programs tested performed exactly the same. They decoded error-free with a minimum SNR of -8db. The other two required an SNR of -5db and -6db. The outcome was the same whether I ran the programs simultaneously or one at a time. Tony, K2MO ----- Original Message ----- From: "Dave AA6YQ" <[EMAIL PROTECTED]> To: <digitalradio@yahoogroups.com> Sent: Monday, September 29, 2008 8:14 PM Subject: RE: [digitalradio] Comparing data modes > Its my understanding that when multiple simultaneously running applications > are using the soundcard with different sampling rates, that Windows delivers > a compromise sampling rate. Thus comparisons run on the same PC may not > accurately reflect each application's performance in isolation. > > 73, > > Dave, AA6YQ > > -----Original Message----- > From: digitalradio@yahoogroups.com [mailto:[EMAIL PROTECTED] > Behalf Of Rick W > Sent: Monday, September 29, 2008 7:23 PM > To: digitalradio@yahoogroups.com > Subject: [digitalradio] Comparing data modes > > > To do simple test comparisons of the modes, I will bring up two software > programs and visually see how the print compares between the two. The > main comparisons have been between Multipsk, HRD/DM780, and fldigi. For > most of these tests I have been using my emachines tower with Intel 2.93 > GHz running Windows XP. > > I also have an HP Pavilion tower with AMD 4600+ chip running Vista and > have been using it primarily for tests with my SignaLinkUSB interface to > my ICOM IC-7000, which also allows me to have two digital data stations > in the shack to perform ARQ testing with NBEMS. I can not view both > computers at the same time since I use a KVM switch to work between them. > > I have not been able to see any situations where one program is clearly > superior to another in decoding the signals. > > 73, > > Rick, KV9U > >> Rick previously had written: >> >> >>> When I have done some crude comparisons with actual off air tests >>> between different programs, there is usually not a lot of difference >>> >> Tony wrote: >> >> I'm interested in your test method. >> >> Tony, K2MO >> >> > > > > >
