[Lowfer] Homebrewed SSB filter in the REAL world

[Andy - KU4XR]

Hello again All:

First, I want to thank everyone who responded to my question
about homebrewing an USB Crystal Filter for LOWfer work.
Now the real world discovery; the hombrewed crystal filter
idea will work, however !! it's not monetarily feasible to
accomplish. to have a crystal cut for the 150 - 500 KHz range
will cost in excess of $ 100.00. I'll admit; I wasn't expecting
that at all. I was thinking probably around 25 to 30 dollars,
so that came as a shock.

John A's approach is the most feasible. The LC filter. Being 
passive, it will possibly need a little extra amplification
in some stages to bring up the drive levels. On the positive
side, the LC filter can be built around my fixed Oscillator
for the right passband.

One more question about the audio. As John D mentions, the 
sine wave output must be noticably ampilified for a linear PA,
or converted to an amplified square wave to drive the popular
K0LR complimentary pair PA.
Will the conversion ( clipping ) process introduce distortion
products that might become a problem in the final stages of 
the system ?? 
Please elaborate from both the linear and non-linear outputs.

SIDEBAR !! Common sense engineering would put any audio
amplification stages " After " the LC filter once you have
attenuated the LSB component as much as possible, correct ??
otherwise, wouldn't you defeat some of the attenuation that 
the filter will do on the LSB audio ??  As John A  said; It's
going to be so small that it really won't matter from an
interference standpoint, but could it matter in affecting the
1 watt input level for the USB audio. If I'm correct, any 
LSB component left over will " add to " the USB which will
slightly lower your desired USB output.

73 everybody.

Andy - KU4XR - EM75xr - Friendsville, TN.
LOWfer Beacon " XR " @ 184.322 KHz ( QRSS-60 )
Coordinates:  N:  35* 43' 54" - W:  84* 3' 16"
http://www.myspace.com/beaconxr