Hi,? I'm considering purchase of an FT-818 but have? some potential concerns over the capability of the new 70cms RF filter design in the 818 vs the 817.?
The 817 had a 3 section helical filter that resulted in very good image rejection performance, mostly exceeding the 60dB spec by a significant amount.? Looking at the 817 vs 818 teardown at it looks like the 818 has replaced the helical filter with something that looks like a 2 section lumped filter (has anyone seen the schematic to confirm please?).
I noticed the 818 review in the Jan QST ( ) reported that the ARRL measured a 70cms image rejection of only 38dB, well below the 60dB spec.
Perhaps the ARRL sample unit was not correctly aligned, I would be most grateful if anyone has noticed this performance aspect please as 70cms performance is quite important to me.
Many thanks
Simon
M0AZR
