99RE255
TDFM-136 Installation & Operating Instructions
B-4
Technisonic Industries Ltd.
B.
Determine if the image frequency for the VHF Comm falls within the range of the TDFM-136. If so, select
a set of frequencies that will cause the TDFM-136 to be set as close as possible to the image frequency.
Any one of the many possible sets will suffice. Record those values in the spaces provided in the
following chart. Modulate the TDFM-136 transmitter on the following frequencies for at least 20 seconds.
Listen for any noise or detected audio signals on the VHF Comm.
Example
– Bendix/King KY 196A;
The first IF frequency is 11.4 MHz. The L.O. is above the receive frequency (high side injection),
therefore the image frequency is 22.8 MHz above the selected frequency. Set the KY 196A to
120.000 MHz and the TDFM-136 to 142.8000 MHz.
d p c o s c l a g c q
d p c o s c l a g c q
d p c o s c l a g c q
d p c o s c l a g c q
p c q s j r q
p c q s j r q
p c q s j r q
p c q s j r q
t f d > A O
t f d > A O
t f d > A O
t f d > A O
r b d k K O Q T
r b d k K O Q T
r b d k K O Q T
r b d k K O Q T
n _ q q
n _ q q
n _ q q
n _ q q
d _ g j
d _ g j
d _ g j
d _ g j
135.975 MHz
138.0000 MHz
121.150 MHz
157.5000 MHz
131.250 MHz
157.5000 MHz
Image
d p c o s c l a g c q
d p c o s c l a g c q
d p c o s c l a g c q
d p c o s c l a g c q
p c q s j r q
p c q s j r q
p c q s j r q
p c q s j r q
t f d > A P
t f d > A P
t f d > A P
t f d > A P
r b d k K O Q T
r b d k K O Q T
r b d k K O Q T
r b d k K O Q T
n _ q q
n _ q q
n _ q q
n _ q q
d _ g j
d _ g j
d _ g j
d _ g j
135.975 MHz
138.0000 MHz
121.150 MHz
157.5000 MHz
131.250 MHz
157.5000 MHz
Image
NOTES:
