DANIELS
ELECTRONICS LTD.
TM
VHF Enhanced Extra Wideband Receiver Instruction Manual IM10-VR3H040-AB
2-3
2.3
Receiver Assembly and Adjustment
All modules and the front panel are mounted on the Receiver Main Board which then forms a
single assembly. The FE3H Front End is attached with two front panel screws and one screw
through the rear F connector. Removal is required to access the Synthesizer for tuning. An
enclosure is formed by an extruded aluminum shell that slides over the Receiver Main Board as
illustrated in section 2.8). The enclosure is completed by the installation of side and front panel
screws (see section 7 in this manual for parts lists).
Receiver alignment is performed on a module by module basis and detailed steps are provided in
the respective manuals. Alignment is simplified by using an SR-3 Subrack, SM-3 System
Monitor, and RF extender cable to provide receiver power and signal interconnection.
Alternatively, +9.5 Vdc and +13.8 Vdc, as well as any required test signals, may be applied
directly to the individual modules. Refer to section 4.
Throughout the alignment procedure reference is made to a "standard signal". This refers to an
external generator signal source with FM modulation, 1 kHz tone, and 60% system deviation
connected to the receiver RF input type N connector (if a nominal receiver frequency is not
given, it can be assumed to be the selected receiver channel frequency).
2.3.1
Complete Receiver Alignment
A complete Receiver Alignment is performed at the factory and should not be required under
normal circumstances. A large change in operating frequency, as discussed in the next section,
may require a complete realignment operation. This operation requires that all the receiver
modules be aligned on a per module basis in the following order.
Sequence
Module
(1)
Front
End
(2)
Synthesizer
(3)
Receiver
Main
Board