A perfect 16-bit ADC would have a difference of 97.8 dB between the average noise level and the level of the full-scale sinusoid. This is a basic fact, and it is NOT violated by ADCs used in SDR rece
As long as the quantization noise is not correlated with the signal, ADC will successfully convert signals much, much smaller than the quantization step. The noise effectively interpolates ADC steps
That is another matter. Dithering removes nonlinear effects of ADC steps, but it does not remove other forms of nonlinearities. Due to ADC nonlinearities (other than quantization steps), some distort
Filters like those have trouble in achieving 40 dB attenuation in the next/previous ham band. At +/- 750 kHz (or +/- 1.5 MHz) attenuation is practically non-existing. 73, Sinisa YT1NT, VE3EA
Hi Rick, that's what I had in mind. Taking the 7 MHz filter as an example, there is 40 dB attenuation on ~3.5 MHz. But on 6 MHz the attenuation is practically nil. Your preselector is the right tool
Hi Rick, that's what I had in mind. Taking the 7 MHz filter as an example, there is 40 dB attenuation on ~3.5 MHz. But on 6 MHz the attenuation is practically nil. Your preselector is the right tool
Does anybody know the location of diode D115 on rear I/O board A0, Orion 565? Diode type is CMR1-10, marking C10, 1 A, 1000 V, case SMB. This diode is connected anti-parallel with 13.8 V DC input, af
PBT (with constant filter bandwidth) is easily done with single conversion and single filter. Just vary VFO and BFO frequencies simultaneosly to keep the resulting carrier frequency unchanged. 73, Si
... Well, the terminology isn't standardised well enough. Orion's PBT works exactly as "IF Shift" in your description, and I'd guess that Palstar rig does the same, judging from LSB and USB marks aro
Can somebody recommend a 565 firmware version that has a reliable Sweep operation with 4.5 kHz Sweep Range? It will operate simultaneously with serial communication. It may slow down the things, but
The only thing that you can set separately is "Encoder Rate" in "Others" menu. It should be set to "Fast" for both internal and external encoders, providing 250 steps or 2.5 kHz per rotation with 10
Well, those graphs are not about TX wideband noise at all. They just show clicks. Are there any graphs that show the TX noise across the entire band, and even other bands? The levels are expected to
The usual practice is this: * TX on, say, 14 MHz, transmits through a 14 MHz bandpass filter, which attenuates the TX noise on 21 MHz. * RX on, say, 21 MHz, receives through a 21 MHz bandpass filter,
I had the same problem. VFO B encoder had a supply voltage of only 4.66 V. After tightening 4 fixing screws on the A9 board, the voltage at encoder rose to 4.77 V and it started workig. 73, Sinisa