Kenwood TM-741A User Manual
Page 63
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Some dial frequency relationships may result in internal heterodyne tones being generated by the TM-641A/ 741A/
741E. This is not a defect.
The following formulas may be used to determine if a tone will be present with a particular frequency relationship.
If any of the following equations are true, a tone may be generated that is strong enough for you to hear it in the
speaker of both bands. These tones can only be generated when more than one band is on at a time:
With the optional FM unit UT-1200;
((1.2GHz operating frequency) — 59.7MHz)
x
2 — ((70CM operating frequency) + 21.6MHz)
x
5 = 59.7 MHz
or
((70CM operating frequency) + 21.6MHz)
X
4 — (((1.2GHz operating frequency) — 59.7MHz) /2)
x3=
59.7 MHz
or
((1.2GHz operating frequency) — 59.7MHz)
x
2 — ((70CM operating frequency) + 21.6MHz)
x
5 = 21.6 MHz
For TM-741A/741E with the optional FM unit UT-220;
or
For TM-641A with the optional FM unit UT-440S;
((220MHz operating frequency) — 30.825MHz)
X
5 — ((70CM operating frequency) + 21.6MHz)
x
2 = 30.825 MHz
i
With the optional FM unit UT-50S;
((6M operating frequency)
T
10.595MHz)
X
7 — ((70CM operating frequency) + 21.6MHz) = 21.6 MHz
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