R.L.DRAKE Q-X'ER Manuel utilisateur

INSTRUCTIONS

for

DRAKE

COMPANY

I. GENERAL DESCRIPTION OF

Q-X’ER

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

NOTCH

With the selector switch set in the NOTCH position, a very

sharp rejection notch may be tuned across the pass band of the re-

ceiver to eliminate an, interfering carrier or heterodyne. The gen-

eral 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 sig-

nal. See Fig. (1).

2. BOOST

With the selector switch set in the BOOST position again

the general shape of the receiver pass band is unchanged (though

lower in amplitude) but a sharp spike is imposed on top of the re-

sponse. 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.

note). (Tuning here does not change the Beat Frequency

In principle of operation, the

Q-X’er

is simple. It is a two terminal de-

vice shunted across an I. F. transformer ‘in the receiver 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 mul-

tiplier circuit. The

Q-X’er

acts just like

resonant circuit with a Q of approxi-

mately 3000. This accounts for its sharp peak or notch.

-1-

Connect power to the

Q-X’er

as follows:

Green wire to one side of

6.3

V. heater supply

White wire to other side of

6.3

V. heater supply

Note: Neither green nor white wire is grounded

in the

Q-X'er

so a

heater supply with cen-

ter tap ground or one side ground is 0. K.

Current required is

amps.

Red wire to B-t 100 to 300 VDC

Current required is

.25

to 2 ma.

Black wire to Ground or B-.

This

power can usually be taken from the accessory socket of the

receiver or slicer. The

Q-X’er

cable is supplied with a 4 pin

plug and socket

for

use when accessory socket is not available.

When a power or accessory socket is available, remove the 4 pin

plug which is supplied and replace it with one to match the acces-

sory socket. DO NOT connect coax cable yet.

Turn on receiver (if it has variable I. F. selectivity, set for most

tive position. If it has a crystal filter,leave it off. ) Carefully tune in and

center a steady carrier.

("S"

meter will show a peak.) DO NOT change

tuning again until

Q-X'er

is adjusted.

Slightly turn in each direction the adjusting screw on the 455 KC I. F. cir-

cuit to which the

Q-X'er

is to be connected to see that it is exactly peaked

to the rest of the set. This tuned circuit is preferably the one at the plate

of the mixer tube. Do not connect the

Q-X'er

to a low impedance point

such as the grid following a crystal filter or the plate or grid end of a

mechanical filter.

Connect the I. F. coax cable of the

Q-X'er

to the tuned circuit chosen above.

As stated, the mixer plate is ingeneral the best spot. If an octal based

tube is used, the connection can be made by removing the tube from the

socket, slipping the loop on the cable over the plate pin, and replacing the

tube in the socket. If a miniature tube is used, the coax connection should

be made by soldering directly to the socket under the chassis.

Connect

the coax direct; do not use a series condenser.

It should be noted here that there are three tuned

circuits involved in the operation: (1) in the I. F. trans-

former of the receiver,(2) the input coil of the

Q-X’er

which tunes out the capacity of the coax cable, and (3)

the

Q-X’er

tuning circuit. For proper operation it is

important that these three circuits be tuned to the same

frequency. Follow the installation instructions carefully.

II. INSTALLATION INSTRUCTIONS

selec

-2-

Ground the shield of the I. F. coax cable to the chassis unless the

receiver has a “hot” chassis as in an AC-DC set. In “hot” chassis

receivers do not connect the shield; cut it off and tape the end to

prevent accidental connection.

Remove two nuts on back of

Q-X’er

and pull off back cover and case.

7. Set

Q-X’er

switch to “OFF” position. Carefully adjust input coil,

L2 (see fig.5) for maximum

“S”.meter

reading.

8. Set

Q-X’er

switch to PEAK.

below oscillation. Set PEAK ADJ. control to a point just

Rotate

Q-X'er

TUNING knob to peak carrier

(maximum “S” meter reading). This should occur at the center of

the

Q-X’er

tuning range. If it does not, adjust the screw on the

shielded coil,

(see fig.

6),

to peak the carrier at this point.

Note

These two coils in the

Q-X'er

are factory adjusted to

455 KC. Your adjustment takes care of any small devia-

tion from 455 KC in the receiver I. F.

9. Replace cover and case.

Q-X’er

is now ready for use.

Changing length of I. F. coax cable will cause detuning

L2.

If the length must be changed, L2 must be re-

tuned as in Step 7 of “Installation Instructions”.

recommend that the unit be adjusted and operated as

shipped before a change in cable length is attempted.

III. OPERATING INSTRUCTIONS

Finding the Notch

When you first use your

Q-X’er,

you will probably have

trouble locating the notch. The NOTCH ADJ. control is a balancing adjust-

ment for which there is only one correct setting.

mum rejection for all conditions. This setting will give maxi-

For good notching, the NOTCH ADJ. con-

trol must be set to within about

l/16”

of this point.

set NOTCH

ADJ.

control for the first time follow these instructions:

Locate the approximate setting of the TUNING dial for some stable

heterodyne by using the BOOST or PEAK position.

Turn switch to NOTCH and carefully turn the NOTCH ADJ. control

until some rejection of the heterodyne is observed.

Slight adjustment alternately of TUNING and NOTCH ADJ. will give

maximum rejection of the heterodyne.

Leave the NOTCH ADJ. control set at this position. It will give best

notching over the entire tuning range of the

Q-X’er

and probably

never need to be changed very much.

-3

Notching Out a Heterodyne

Tune in desired signal with

Q-X’er

2. Switch to

_NOTCH

and turn TUNING

switch

“OFF”.

knob to the point where the

heterodyne disappears. No need to touch the NOTCH ADJ. con-

trol if it has been previously set properly.

Note: The heterodyne is caused by a beat between the desired

carrier and the interfering carrier. The removal of either

will stop the heterodyne but if you notch out the carrier of

the desired signal, the audio will become greatly distorted.

3. If the interfering carrier drifts in frequency, follow it with the

Q-X’er

TUNING; d0 not retune receiver. This flexibility is a dis-

tinct advantage over the crystal filter; i.

e.,

you tune receiver for

best signal; tune

Q-X’er

to remove interference.

Boosting Weak Carrier of AM Signal

Tune in signal with

Q-X’er

OFF.

2. Switch

Q-X’er

to BOOST and set

Q-X’er

TUNING at the signal

carrier as indicated by a peak

“S"

meter reading or the point

where the background noise drops away.

3. Turn up PEAK ADJ. control to the desired degree of boost. Maxi-

mum boost occurs just before

Q-X’er

goes into oscillation.

4. Adjust receiver gain control for desired audio level.

Peaking

Tune in a signal.

2. Switch

Q-X’er

to PEAK.

3. Tune

Q-X’er

to signal by noting a marked increase in signal level.

4. Set PEAK ADJ. for desired shapeness of response. Sharpest peak

occurs just below point where

Q-X’er

goes into oscillation.

Q-X’er

TUNING control can be used for a fine adjustment in tuning

a signal.

-4-

IV. MAINTENANCE

The

Q-X’er

circuit differs from other Q multiplier circuits published

in that the degeneration tube is neutralized. This is factory adjusted by

varying the spacing between a pair of ceramic disc capacitors. If these

capacitors are moved,this adjustment is lost and operation is impaired in

the notch position by a peak which will appear on one side of the notch.

(It

is also possible to get this unwanted peak if L2 is not adjusted properly in

Step 7.

)

Therefore,it is not recommended that repairs be attempted other

than replacing the tube.

Factory repair service is available to put your

Q-X’er

in “like new”

condition for $1.00 plus parts and postage.

Note: Please complete and return the enclosed registration card.

R.L. DRAKE COMPANY 18 E. CENTRAL AVENUE MIAMISBURG, OHIO

Fig.

Effect of NOTCH on Receiver Selectivity

Fig.2

Effect of BOOST

/’

‘\

Fig. 3 Effect of

PEAK

-L

2.7mmf

47K

nnr

T150 K

.AhA

r---

500mmf

RFC

-I

2.2

Meg

---._

l8K

.005

---0

t,-

_I_

-!I0

mmf

home

units)

l5K

(ap

prox.1

Cap. values in m

fd.

unless otherwisenoted.

PEAK o

POWER PLUG viewed

from pin end.

Fig. 4 Schematic Diagram of

Adjust L2

Adjust

QT@

IIII

lllIIll

Fig.5 Bottom of

QX’er

Fi q. 6 Top of

QX’er

Table des matières

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