Quantcast Chapter 3. FUNCTIONING OF EQUIPMENT 6625-01-098-2534)">

 

Click here to make tpub.com your Home Page

Page Title: Chapter 3. FUNCTIONING OF EQUIPMENT
Back | Up | Next

Click here for thousands of PDF manuals

Google


Web
www.tpub.com

Home

   
Information Categories
.... Administration
Advancement
Aerographer
Automotive
Aviation
Construction
Diving
Draftsman
Engineering
Electronics
Food and Cooking
Logistics
Math
Medical
Music
Nuclear Fundamentals
Photography
Religion
   
   

 

Share on Google+Share on FacebookShare on LinkedInShare on TwitterShare on DiggShare on Stumble Upon
Back
Table 2-2. Relationship Between RF Tune Control and Operating Frequency
Up
TM-11-5825-270-23 Monitor Radio Frequency R-2176/FRN (NSN
Next
Figure 3-1. Block Diagram, Monitor Receiver.


TM 11-5825-270-23
CHAPTER 3
FUNCTIONING OF EQUIPMENT
Section I. FUNCTIONAL DESCRIPTION
3-1. General
are above a predetermined threshold and the keyed
modulation is present, the operation is considered to be
a. The monitor receiver is a flux-tuned, non
normal.
However,  if  some  abnormal  operating
conditions cause the transmitter carrier level and/or
directional beacon (NDB) monitor specifically designed
modulation to fall below the predetermined threshold or
to verify continuously the operational readiness of an
the keying becomes continuous, the monitor receiver
associated NBD transmitter.
The monitor receiver
generates the following alarm output
consists of an antenna assembly and a receiver
(1) Visual alarm (red light on front panel).
assembly.
b. The antenna assembly comprises a one meter
(2) Aural alarm (3 kHz tone from built-in
loudspeaker).
long whip antenna and a matching module. The signal
(3) Alarm contacts (form-C contacts for remote
transmittal by the NBD transmitter is picked up by the
monitoring).
whip antenna and fed to the receiver through the
matching  module  which  transforms  the  antenna
3-2. Block Diagram Description
impedance to 50 ohms (nominal).
c. The receiver is a crystal-controlled, single
a. Figure 3-1 is a simplified block diagram of the
conversion superheterodyne unit, providing high degree
monitor receiver. The rf signal from the NBD transmitter
of selectivity and sensitivity. The receiver is fix-tuned to
is picked up by the whip antenna and applied to the
the same frequency as that of the associated NBD
matching  module  which  transforms  the  antenna
transmitter, over the range of 160 kHz to 535 kHz. In
impedance to approximately 50 ohms There is no signal
operation, the receiver continuously monitors the rf
gain in the matching module and its output is fed to the
carrier level and keyed modulation of the NBD
receiver through a coaxial cable.
transmitter signal. As long as the amplitude of the rf
carrier and modulation level of the signal being received
3-1


Privacy Statement - Press Release - Copyright Information. - Contact Us

Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business