Chen's explanation is quite accurate. I think I did try the MK2 sound card and it works, but not ideal for this application. Besides, unless you ONLY use LP-PAN, you will need another sound card for PSK, voice keyers, etc. You can use multiple sound cards... I have 6 on my system currently, including the MK2. The sound card for LP-PAN should be dedicated to LP-PAN for best results. The recommended sound cards for LP-PAN can be purchased for as little as $70 new, and less on eBay. The most often used one is the E-MU 0202, which costs $100 and is widely available online. It's USB, easy to install, but a little resource hungry, so it's best if you have a dual core system. The best card in terms of dynamic range is the E-MU 1212m PCI card at about $140, but it takes two slots. There are others.
73, Larry N8LP Kok Chen wrote: > > > On Mar 5, 2009, at 3/5 5:26 AM, Igor Sokolov wrote: > >> Bob, does it mean that the USB sound card built into MicrokeyerII >> cannot be >> utilized by LP-PAN? Why? > > > Not that you cannot use just any garden variety sound cards, but there > are at least two reasons to use a better sound card with an SDR. > > The dynamic range of the simple sound cards will be a limiting factor > when used with something like the LP-PAN. Although the digiKeyer and > microKeyer II have relatively low noise floors for a 16 bit codec, it > is still a reason to use better sound cards for an SDR. I had measured > the distance between the noise floor and the full scale of the sound > cards in both the microHAM keyers to be in the 95 dB region. > > You have an extra 10 dB or so of headroom with a sound card like the > EMU 0202 (USB) or Edirol FA-66 (FireWire). For an SDR type use, the > harmonic distortion from sound cards also factors into your choice. > If needed, you can move the harmonics of a strong station from > clobbering a weak station by turning the VFO knob on the K3 -- it is > just inconvenient to do so. > > A second big factor that influences the choice of sound cards for an > SDR is the highest sampling rate they can operate at, since that > determines the width of the "panorama" which you can see. The highest > sampling rate from the microKeyer II is 48,000 samples per second > which, when used in a quadrature fashion, limits the "panorama" to > about 40 kHz. Both the EMU 0202 and the Edirol FA-66 can go up to 192 > kilo samples/second. > > 73 > Chen, W7AY > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > > -- View this message in context: http://n2.nabble.com/K3-%2B-LP-Pan-%2B-Microkeyer-II-tp2425580p2429731.html Sent from the Elecraft mailing list archive at Nabble.com. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
