[Hammarlund] Help with Sensitivity Chart

K3PID k3pid at sbcglobal.net
Sat Jan 13 14:41:22 EST 2007


Help me understand the sensitivity chart in my HQ-145 manual ( and probably
others). It has an X axis center zero and +/- 7 Kcs and a Y axis starting at
1 times resonance going to 1000 times resonance. Is the times resonance
scale in volts? That is, does the 20 times resonance line represent a signal
that is 20 times the voltage of a signal at the resonance peak? If so, does
that line up with -16 db. I am trying to determine the passbands for the
various filter settings. If I use the Times 20 line as -16 db sensitivity,
my HQ-145 has slightly narrower passbands for each switch position than
those charted. That's good in my book but I want to make sure I am
understanding the chart correctly!


K3PID
Ron H.




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