![]() ![]() This bandwidth was suitable since most of the activity took place from 1810 to 1890 KHz.I used the main TRX for basic work and simultaneously watched at the waterfall display for weak stations orpile-ups. I do not know the reason for that but these few KHZ at the band edges were not very usable). (at the band edges some digital aliasing occurs. I had now 96 KHz bandwidth from 1806 to 1902 KHz. I tuned the VFO at 1854 KHz and entered this value in the software. QTHis KN12KD near Sofia, Bulgaria in a small village in a deep valley (not quite good for DX contacts). Running Rockie or Winrad occupied between 15-20% of the CPU resources at 96 KHz s/rate. The sampling rate was 96 KHz 16 bit resolution since this USB card uses USB1.1 and the bandwidth is insufficient for 24bits/96KHz resolution. ![]() Windows XP.Rockie 3.2 ( ) and Winrad 1.3.( ). The computer has internal Sigmatel High definition audio sound which appears to be useless for SDR since it was not possible to reach any I/Q balance by unknown reasons. Sound card is SoundBlaster Live! 24 bit USB external. ![]() I plan to translate them into English if the free time permits. Additionally I added a band pass input filter (1.8MHz 700 KHz bandwidth).Ī description of this radio and how it is measured can be found on my home page the articles are in Bulgarian language. It is expected this radio to have similar or better performance on 1.8 MHz band.It must be noted that the oscillator phase noise on this band will be very low. The simplest solution is used: the antenna input/output of the transceiver (TRX) and the antenna input of the direct conversion receiver (DC RX) are tied together in rx mode.In TX mode the DC RX input is grounded.A small fast relay (FRT5 telecom relay switch time = 15 dBm,Sound card saturation -26 dBm. I've made a small kit you can use to intergrate your SDR and transiver. ![]()
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