Rahul,
I came to the same conclusion a while ago.? Your estimates of loss are a bit higher than
my measurements but we are talking maybe 2-3db but its all the same in that there is?
way too much TX path gain.
However the spur is visible when the input to the last mixer is -10dbm.
Also the balanced mod can be pushed harder to? maybe -13dbm is not bad and it helps
the carrier to signal ratio some.? The 12mhz filter in mine measures under 4DB loss when
modded for 2160hz bandpass.? My 45mhz us less than 5db loss.
I have the gains for TX 12mhz of 7db and 45mhz of 8db and its still high but?
closer.? That much gain is not needed as the modulator is already a fairly
large signal.
Allison
