Drake Q-X'er Receiver
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Attachment for Radio Receiver
The Q-X’er is an attachment for a radio Receiver
. Its main
purpose is to help discriminate between the wanted signal
and interfering signals. The purpose is the same as for a
crystal filter but the Q-X’er in operation is a much more
effective device. Three modes of operation are provided for
as follows :
1. NOTCH - With the selector switch set in the NOTCH
position, a very Sharp
rejection notch may be tuned across
the pass band of the Receiver
to eliminate an, interfering
carrier or heterodyne. The general shape of the Receiver
pass band is unchanged and the notch is so Sharp
that it is
almost imperceptible in the audio of the desired signal. See
2. BOOST - With the selector switch set in the BOOST
position again the general shape of the Receiver
is unchanged (though lower in amplitude) but a Sharp
is imposed on top of the response. This spike may be tuned
across the pass band to boost any single frequency. See Fig.
(2). Generally, this position of the switch is used to boost
the carrier of a weak Phone
or broadcast station to prevent
distortion due to selective fading, etc.
3. PEAK - With the selector switch in the PEAK position the
pass band of the Receiver
is narrowed to a very selective
response only a few hundred cycles wide. Fig. (3). This is
ideal for C. W. reception.
The Q-X’er TUNING control can be used for a fine adjustment
in tuning in the signal. (Tuning here does not change the
Beat Frequency note).
In principle of operation, the Q-X’er is simple. It is a two
terminal device shunted across an I. F. transformer ‘in the
to act as a gate letting through the desired
frequencies and stopping the undesired frequencies. The
Q-X’er achieves its performance through the use of an
efficient, stable Q multiplier circuit. The Q-X’er acts just
like a resonant circuit with a Q of approximately 3000. This
accounts for its Sharp
peak or notch.
Service and User Manual
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09 August 2017