are the sound card used and not the SDR-1000 hardware itself. TX noise spectra shows a lot of DDS distortions which also affect RX performance. 73 de Mario, S56A, N1YU
converts the incoming signal directly to audio. Conversion or mixing is frequency translation (DC = 0 IF) with local oscilator and should not be confused with signal detection (BFO for CW/SSB or DSP
Some TT readers might be interested in RSGB review of IC-7800. G3SJX noted second oscilator noise being higher then IC-756 or Orion. There are 5 GIF files ending in 1-5 at: http://artinian.bit.si/ic7
options open to protect my American civil liberties. I humbly apologize for puting G3SJX IC-7800 review on my homepage and announcing it on TT forum in my European tradition of culture, sciences and
Similar ARRL Orion test shows first 20 msec dit halved on RF output and delayed 23 msec, just in the middle of RX time space! Second dit is delayed 22 msec and choped 30 %. It is still positioned wi
It is actually your brain crying "give me some music" instead of single breaking tone or 3 kHz limited audio. My ears have formed LPF with 3 kHz notch of -25 dB after 40+ years of hamradio even with
the Omni tells me something. Question is: What did it tell me? PRO has very fast AGC attack in order to prevent DSP ADC overflow. It also recovers more RX gain between dot pauses and therefore signa
signal processing." Some of the numerous functions you mentioned are NOT digital SIGNAL processing but general purpose digital control done by separate Motorola CPU. 73 de Mario, S56A, N1YU
Analog signals are first converted into digital form for DSP. DSP output can be a single control bit or another analog signal thru D/A converter. There is no need for DSP of digital impulses directl
simply does not allow the A to D and DSP stages to ever see signals that are outside of those component's own dynamic range. IF DSP is done on the upper end of audio frequencies (36 kHz) with 24 bit
It was nice to have two presentations on SDR from the world best young salesman and contester! I only wished Orion had pasive FET mixer with IP3=37 dBm :-) 73 de Mario, S56A, N1YU
I spoiled my English accent aquired in 1970/2 upon visiting USA in 1976 :-) Great on W4PA PPS presentations! You must add your intro photo in BV outfit. 73 de Mario, S56A, N1YU
community: -- VFO's are not receivers -- Once upon a time when IF was within HF working range, there were separate boxes for receiver, transmitter and later even VFO! But there is no "chicken or egg
Icom marketing hype about the 7800. Apart from +37 dBm IP3, I was amazed by IC-7800 nonexistent IMD3 AF products even with fast AGC. This alleviates the needs for expensive sharp front end filters.
P.S. Compare IC-7800 and Orion TX output spectra. Orion RX is the same on HF IF and image frequencies. Which radio would you prefer in multiband environment? 73 de Mario, S56A, N1YU