I've sent a few e-mail back and forth with the manufacturer but they have gone quiet. They will not admit there is any issue with the Firmware
this is the last reply I had:
I've just replied to the message of your friend.
We are indeed not aware of a firmware bug causing unstable reading -
however this does occur sometimes when the input preamp adjustment is
not spot on.
One of the things we will be changing in the future is a more detailed
instruction on how to do this in the manual, and also an emphasis on how
important this is for the correct operation.
If the adjustment isn't done as it's supposed to, issues like the one
showed here may occur.
My friend had a similar reply, but was told this "It could also be a problem with the BF256 JFET, you can test this by
measuring the signal behind it - it should be as stable as the input signal.
This part is very susceptible to ESD and requires careful handling
during assembly to not damage it."
It seems they are in denial of any issues of this product and not willing to rectify it
, such a shame as it could be a great product, especially with the 5.8GHz option.
And if the source code was published then someone would have fixed this by now. I can only assume who ever wrote the original code no longer works there or something.
Maybe another email to the maker of the unit advising that the issue is now being discussed and proven on the well known and respected EEVBlog.com forum where it will be seen by many. The thought of losing sales might encourage the maker to address the issue? If not, the maker is clearly not interested in supplying a quality product and does not deserve our money. I have not used my unit enough since building it to see this problem, but I am suitably displeased to hear that the maker thought such an issue was ‘OK’.
Fraser