>From a previous thread: > > and then sample rate was 11500 and I changed it to 48000 > > DigiPan says please enter an integer between 7000 and 12000 > so I changed it back to 11500 >
On the topic of sound cards for digital modes in general: While using a sound card with a wide frequency response, and using high sampling rates, might intuitively appear to be a good idea, I'd suggest this is not likely to be the case. Given that we tend to use the sound card to monitor a radio passband that's not (likely to be) more than 5KHz wide, sampling much above the Nyquist frequency for 5K (10K samples/second) seems counter-productive. It seems to me that the key criteria for choosing a sound card for digital use would be: - Flat frequency response from (some low frequency such as) 100HZ to 5KHZ - Dynamic range in the area of 100db (and hence, a very low noise floor) Additionally, it seems like it would probably be a good idea if the sound card had filtering to remove frequencies below 100Hz and above 5KHz. Thoughts? What am I missing in this logic? de Peter K1PGV
