DANIELS
ELECTRONICS LTD.
TM
2-4
IM10-VR3H040-AB VHF Enhanced Extra Wideband Receiver Instruction Manual
2.3.2
Frequency Change
The receiver is initially aligned at the factory for the frequency stamped on the 'Factory Set
Operating Frequency' label (see section 3.1). This label should list the frequency at which the
last complete receiver alignment was performed. For a small frequency change, a simple channel
change (see section 2.2) may be all that is required. A larger frequency change may involve the
realignment of other modules. The frequency change in question is the
accumulated frequency
change
in relation to the frequency stamped on the label. For example, if the frequency is
changed by 0.5 MHz from that stamped on the label, then a second frequency change of 1 MHz
in the same direction would result in a total change of 1.5 MHz. The action taken would be on
the basis of the 1.5 MHz value. Failure to perform a realignment after a large frequency change
could result in unreliable receiver operation or operation that does not conform to the published
specifications.
Size of Frequency Change
Modules to be Aligned
less than ± 0.5 MHz, 29 - 39MHz (minor)
Receiver Main Board (Channel Change).
less than ± 1.0 MHz 38 - 50 MHz, (minor)
Receiver Main Board (Channel Change).
greater than ± 0.5 MHz, 29 - 39MHz (major)
Complete alignment.
greater than ± 1.0 MHz 38 - 50 MHz, (major) Complete alignment.
