软件定义业余电台，越来越不像电台了。不过好像性能很不错，不知道实际效果怎么样。
http://www.flex-radio.com/products.aspx?topic=videos这个公司网站上有视频介绍，首页还能看到arrl测试数据。
youtube里也有不少视频，搜索flexradio。
transmitter specifications power output :
1 - 100 watts pep cw and ssb at 13.8vdc input voltage
25 watts am carrier
emission modes types :
a1a (cwu, cwl), j3e (usb, lsb),a3e (am), f3e (fm), digital
harmonic radiation :
better than –55 db (160 - 10mamateur bands)
better than –65 db (6m amateur band)
ssb carrier suppression :
at least 55 db below peak output
undesired sideband suppression :
at least 55 db below peak output
audio response (ssb):
flat response 10 hz to 20 khz,
3-band or 10-band software equalizer
3rd-order imd :
better than –33 db below pep @14.2mhz 100 watts pep
microphone impedance :
600 ohms (200 to 10k Ω)
balanced line in impedance :
600 ohms (200 to 10k Ω)
receiver specifications circuit type :
direct conversion, low if
intermediate frequency :
software selectable from dc to 20khz
mds:
14 mhz preamp off/on: 1.3/0.3 µv;
mds: -123 dbm/-133 dbm in 500 hzbw
ip3:
+30 dbm at 14 mhz with preamp off at 2 khz or less tone spacing (s5 im3 method)
selectivity (–6/–60 db):
cw 500 hz –6/-60 db: 500/640
ssb 2.4 khz –6/-60 db: 2.39/2.54
am 6.6 khz –6/-60 db: 6.60/6.74
image rejection :
70 db or better (160 - 6m amateur bands)
