On Mon, Jul 8, 2019 at 11:02 PM, <f4htq@...> wrote:
Dear Hugen,
I own the two versions ( your designed version, black, with battery and
shielded entries, and the "clone" white version ).
I noticed that the mixers used in white version are SA602A instead of SA612A.
Do you think that will be a issue ? have you put SA612A mixers on your model ?
I have a huge performance differencies betwen the black and the white version.
at 900MHz little more than 50 dB of dynamic range subsist with the black
version but no more than 30dB with the white version.
Do you think that can be only explained by the missing shielding ?
(However when i made some test on HF and VHF frequencies, the results seems
quite identicals).
regards,
David, F4HTQ.
Hi,David
NE602 = SA602 = NE612 = SA612
Adding shields should improve performance, but some bad modifications on the PCB can also reduce performance.
Thank you£¡
hugen
