All connections between RF parts, and also connections to ground
MUST BE as short as possible! This is VHF, not HF, in spite that designs
may looks like HF! Hi! See mechanical layout of PA
designs below!
If input
circuit trimmers, need to be at maximum or minimum capacity during adjusting, it
is necessary to change the length of the cable between the exciter and the
amplifier itself. The optimal length of the cable should be determined
experimentally to obtain adjustment with approximately the calculated values of
capacitances. This experimentally determined cable should always be used when
operating the amplifier. A change of exciter could occasionally require a new
length of cable to be determined.
For practical realisation please see the
drawings of Duobander PA with 1xGS31B!
