Hi Sholto, It is not normal specifications to have 12dB tilt (or more) within the passband of an SSB transmitter. The engineer's response to your measured graph of power vs passband frequency indicates that either the engineer is BS'ing you, or the engineer is unqualified to determine the problem.
Bonnie KQ6XA > Sholto wrote: > Now I am confused because I contacted Yaesu and sent > them this graph of my measured transmit passband: > > http://www.projectsandparts.com/misc/ft-450tx.gif > > And this is what the engineer told me: > "Your graph shows the typical audio roll off expected. > The bass band deviation for the FT-450 is 300-2500. > You would expect the dBWs to peak as the filter narrows > and conversely to drop off sharply as you approach > the band edges. That is exactly what your data shows. > Your FT-450 is performing within design parameters."
