P & H Electronics 2-150 Converter
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Model:
2-150
Date:
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Description:
Transmitting Converter
Information
P & H Electronics, Pioneer in the field of transmitting
converters for the amateur VHP frequencies, has taken
advantage of their experience in presenting this new Model
2-150 two meter transmitting Converter. Developed primarily
for the single sideband VHP enthusiast, it is essentially a
linear mixing device followed by a linear RP Amplifier. This
unit permits the amateur to utilize his existing 20 meter
station equipment as a signal source for the 2 meter VHP
band. The features of his existing 20 meter equipment are
then available on the 2 meter band. For example, if his
exciter is SSB, voice controlled, and VFO with .5KC
coverage, then he may operate 2 meters with SSB, voice
control, VFO and ,5MC coverage with similar stability. The
owner of existing 20 meter Ail equipment with VFO or crystal
will be able to operate the 2 meter band, AM,
VFO, or crystal controlled.
This concept prevents costly duplication of equipment; for
many desirable features on two meters are included in many
modern new and used SSB, AM, PE, FM, RTTY, DSB, or CrJ 20
meter exciters.
A signal from the high stability Oscillator circuit may be
used to provide the injection for a receiving Converter,
thus preventing duplication of circuitry and correct
correlation between Transmitter and Receiver calibration.
Description
The Model 2-150 consists of a high stability Oscillator and
tripler circuit, employing a 6EA8, which will operate 011
any frequency from 130MC to 133.5MC. This will permit the
operator to select any segment of the 2 meter band in which
he wants to operate. The unit is normally supplied with a
crystal on 130 or 131 MC which, with most exciters, will
permit operation within the 144 MC to 144.5 or 145 MC to
145.5 MC band segments.
The 130 MC signal is available at a jack on the rear of the
chassis marked Osc. output. This permits the same Oscillator
signal to be used for a receiving Converter.
The 130 MC signal is then link coupled to the push-pull
grids of the 6360 balanced mixer stage. By adjusting the
injection and grid bias of this stage, compensation is made
for small variations in exciter output levels.
The external Pi section pad is used to attenuate the signal
from the popular 100 watt class exciters while maintaining
the exciter load impedance of 50 ohms. Exciters with outputs
from 5 watts to 25 watts may drive the unit at an impedance
of 50 ohms when connected directly to the RF III connector.
The 3 DB pad can be used to correct for large differences in
poirer levels or may be used in conjunction Tilth All
operation as described later in the operating instructions.
x'lo tuning of the 20 meter input signal is required in the
transmitting Converter. This exclusive passive screen single
ended injection circuit thus lends itself to more simplicity
of operation, as well as superior performance with respect
to mixing product attenuation.
Following the 6360 mixer is a second 6360 used as a Class A
buffer Amplifier. Reduced mutual coupling between the buffer
input and output circuits has been accomplished by shielding
and isolation, The buffer plate circuit is overcoupled to
the 7^54 grid circuit permitting further simplicity of
operation. The final Amplifier operates in class A3^ with
reasonable efficiency - up to 60/ . The quiet operating tube
cooling fan delivers up to 200 Cu. Ft./ min. of air flow in
the area of the Amplifier tube envelope and the push-pull
plate tank circuits. This air circulation also keeps the
cabinet temperature to a low value increasing component
life. The high level RF Amplifier circuit is completely
shielded within the cabinet.
The RF output passes through a harmonic filter to the
Antenna connector on the rear of the chassis. The RF output
is sampled, detected, and filtered for relative RF output
readings used in tune up.
Metering of the PA grid current, PA plate current and
relative RF output is provided. The meter scale is
calibrated accordingly.
The conservatively rated built-in Power Supply provides all
voltages for operation of the transmitting Converter. It
features separate high voltage, low voltage, and bias
rectifiers. 5ach source is separately filtered. The PA
screen voltage is regulated as well as the Oscillator
voltage. The mixer and PA bias voltages are variable. A
terminal strip, normally shorted, on the rear of the chassis
provides a PA plate current cut off bias when these
terminals are open. These should be connected to a normally
open relay contact on the exciter voice control relay if an
electronic TR switch Is used to switch the Antenna from the
Receiver to the Transmitter. This is necessary as the noise
generated by the electron flow through the 7854 under the
static current conditions of 50 Ui can be heard in the Receiver.
Manual type:
Service and User Manual
Pages:
16
Size:
6.51 Mbytes (6831072 Bytes)
Language:
english
Revision:
Manual ID:
Date:
Quality:
Scanned document, reading partly badly, partly not readable.
Upload date:
2017 01 01
MD5:
d71f8c233c976021de915b7d3dc68da7
Downloads:
449
Information
Application ... Page 1
Description ... ... Page 1
Specifications ... ... Page 3
Installation and Operating Instructions . . . Page 4
Alignment ... Page 6
Crystal Frequency & Coverage Chart ... Page 7
Interconnection Diagrams ... . Page 8
Tube Layout Diagram . ... Page 9
Parts List ... Page 10
Circuit Diagram ... . . Page 11