2-8. The rf amplifier receives digital tuning
information that is generated in which of
the following units?
1. The receiver
2. The transmitter
3. The coupler control
4. The radio set control
2-9. In some installations tuning must be done
without the use of rf power, as rf is
suppressed except during brief
transmission periods. Under these
conditions, which of the following
methods of tuning should be used?
2-10. Operator controlled tuning of the antenna
coupler group by the use of front panel
controls is possible during which of the
following modes of operation?
1. Silent and manual
2. Manual and automatic
3. Semiautomatic and silent
4. Automatic and semiautomatic
2-11. Once tuned, the antenna coupler is able
to handle which of the following
maximum amounts of power?
1. 500 watts average
2. 2,000 watts average
3. 250 watts peak envelope
4. 1,000 watts peak envelope
2-12. The antenna coupler is pressurized with
dry nitrogen for which of the following
1. To prevent corona
2. To prevent arcing
3. To aid in internal heat transfer
4. Each of the above
2-13. You are using the cw mode of the radio
transmitter unit. The 500-kilohertz local
carrier is directly inserted into which of
the following circuits?
1. The rf amplifiers
2. The IF amplifiers
3. The modulator
4. The detector
IN ANSWERING QUESTIONS 2-14
THROUGH 2-16, REFER TO THE RADIO
RECEIVER DISCUSSED IN CHAPTER 3.
2-14. Adjacent-channel selectivity and image-
frequency suppression have been
improved in this receiver by the addition
of which of the following features?
1. Digital tuning
2. Triple conversion
3. Front panel readout
4. Very accurate frequency standard
2-15. The full accuracy of the frequency
standard is sacrificed when which of the
following types of tuning is used?
3. 1-kilohertz incremental
4. 100- or 500-hertz incremental
2-16. The receiver demodulates and provides
audio outputs for which of the following
types of received signals?
1. Fm, AM, and fsk
2. AM, cw, and isb
3. Cw, fm, and isb
4. Lsb, usb, and fm
2-17. A receiving antenna patch panel serves
which of the following functions?
1. Terminates lines leading to receivers
2. Terminates incoming antenna
3. Both 1 and 2 above
4. Physically connects transmitters to