q
u
a
l
i
t
y
f
a
c
t
o
r
2
0
f
r
e
q
u
e
n
c
y
[
H
z
]
3
0
0
c
h
i
r
p
r
a
t
e
[
H
z
/
s
]
2
0
0
0