Wavetek 3000 - OPTION -4 AUXILIARY RF OUTPUT; Introduction to Option 4; Option 4 Circuit Description; Option 4 Specifications

INTRODUCTION
This option provides a constantampli-
tude AuxiliaryRF Output signal on the
rear panel of the signal genera-
tor . The amplitude (-10
dBm) of
this
signal is sufficient to
drive
most fre-
quency counters . This auxiliary signal
does not contain
amplitude modulation,
however, it does contain frequency
modulation .
This
factory-installedoption entails
changing the M9W Oscillator to an
M9W-1,
the addition
of
an M37
Amplifier
module,
harnessing, and additionalcabling to
the rear panel . The additionandoper-
ation of this option has no effect on
the operation
or
specifications of the
signal generator . See Figure 5-6 for
location of the M37 and cable connections .
SPECIFICATIONS
FrequencyRange

1 to 520 MHz
Level

-10 dBm ± .5dB
(70 mV)
Harmonic output

25 dB belowfun
damentalfrom

1
to 520 MHz .
OPERATING INSTRUCTIONS
To
use the
Auxiliary
RF
Output, dis-
connect the 500 termination
on ttie rear
panel and connecta
frequency counter
or other monitoring
devicewith a
5052
coaxial cable . The
Auxiliary
RF Output
cableshould be kept
as short as possi-
ble . The
output is
controlled by a
rear-
panelon/off
switch .
IMPORTANT
When
not in fuse,
terminate the
Auxiliary RF
Outputwith
the
50 52 terminator
supplied .
Note :
Although thereverse isolation
of the
Auxiliary
RF
Output
is approxi-
mately 30
dB, a signal that is coupled
into the Auxiliary
RF
Output
could be
coupled to the main RF output on the
in-
strument's front panel . For example,
subharmonic signals at a counter's input
can be
coupledthrough the instrument
and applied to the
device under test .
CIRCUIT
DESCRIPTION
OPTION -4
AUXILIARY RF OUTPUT
The
M37 module contains a wide band
amplifier, monitor diode, an errorampli-
fier and a voltagevariableattenuator
.
The input signal to the
M37 module is
fed thru the VVA to amplifier IC1
.
The
approximate gain of the amplifier is
13 dB from 1 to 520 MHz . The monitor
diode,
CR2, detects the output from the
wide
band amplifier . This detected
level is compared to a DC referenceby
the error
amp, IC2 . The output of the
error amp is
fed
to the
PINdiode (VVA)
attenuatorwhich changes the input level
to the
wide band amplifieruntil the
monitored signal produces a DC level
equal to the reference level . This
ref-
erence level is adjusted by R5,
the
output level control .
The
output impedance is providedby the
resistor,R2,connectedbetween the moni-
tor and the
RF output connector .
MAINTENANCE
The only maintenance
for
the
Auxiliary
RF Output is a periodic
check of the
output level . If a malfunction
occurs,
a trouble canbe localized and repaired
with the aid of the theory of operation
and the schematics .
The M37 Schematic
is included in this section .

The M9W/
M9W-1 Schematic is located in Section 7
of this manual .
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