Rome wrote:
Hello.
The correct way to adjust frequency is described in the UM,
eesdr.com/images/Document/SunSDR2_DX/SunSDR2_DX_User_Manual_ENG.pdf
Page 66.
The main idea is that you should set sample rate 32 kHz, max zoom, with as high frequency as possible, preferably with high precision signal generator, closer to 80 MHz.
That is NOT what he was asking,
Using the coefficent he is asking what the relationship of the coefient cumber mean in regards to frequency
Example if using coefient of say 0.0000112 ( that .000112 means what in terms of how many KC in change was made in terms of a 0.000000)
Cody I think this is what your asking corect? does 0.000100 mean 1 kHz or 10 or 100 -please explain Rome
And yes your correct a low number like 50/ 80 etc won't make much if any change, I didnt noitce a change when doing this a couple years ago until I hit over 100 in the last 3 digits, and found that 0.000112 put me spot on frequency
I also DISAGREE with Rome's comment, about using as high freq as possible- that means your LOW frequencice will be inaccurate
If you chose a frequency closer toward middle of the bands (say 20/40 meters) you'll find that your accuracy is more even across all the bands,
If you choose 10 meters for example then yes 6-30 maybe40 are good and fairly accutate but 60M+ is not going to be.
I also disagree with using the lowest kHz rate, I would think that a higher resolution will provide a more accurate outcome, as well as using the tightest skirting as possible (Think filter taps)
Using 3,000 for taps and a 312 Khz sample rate- when I use 20 or 40 meters, I can by ear adjust to damn near spot on, but it takes a good ear and time.
When I got my 2DX it was bad and far off, a good ear can easily tell 1-2 Khz of difference and it drives me nuts.
Im sure I'll get flamed for the above in disagrement and thats fine, I use my ears and compare that to test equipment and the above has given damn near spot on results every time. Not only with the 2DX but other SDR rigs, Flex- Annan, Hermes, SDR kits etc.