Copper Wire Table

NOTE Weights and resistances shown were calculated for wires of nominal diameter hence, variations from these values may be expected. A mil is approximately 1000th part of one inch. The Practical Solution To The Power Supply Problem J) ROB ABLY' the biggest bug-a-boo in radio is the ever-existing menace of obsolescence. Of course, in such a modern industry new developments are constantly being born, and the older methods are soon discarded to make room for the later developments. However, from...

Watt Phone And C W Transmitter

'T'HIS rig might be termed the most popular example of a medium power amateur transmitter. It is straightforward through the entire R.F. and modulator sections. This can be attested to by its universal acceptance by the large number of amateurs who are using this identical circuit. Functionally the xmitter is as follows a 59 tube is used as a tri-tet oscillator which is capacitively coupled to another 59. This stage is used as a doubler or straight buffer stage depending upon the crystal used...

Radiofrequency Power Supply

Tl Piatt transformer type T663 T2 Filament transformer type T366 T3 Plate transformer type T662 T4 Filament transformer type T362 T5 Filament transformer type T351 Tl P. P. Parallel 2A3's to P. P. H. D. 203A T2 P. P. H. D. 203A's to Class C A suitable speech amplifier to drive this unit is Ll. L2 Filter choke type Tl L-. L- Filter choke type Tl6 Cl. C 2 mfd. 2500 volt C3- O 2 mfd. 2000 volt type T470 Cl 0Q2 mfd 2500 vo t mica shown on pace 15. R. F. C. 2.5 millihenries Tl Filament transformer...

Watt C W Watt Phone Transmitter

ONE of the outstanding features of this medium power C. W. and low power phone transmitter is the use of the 803 type pentode tube. Though the initial cost of the 803 tube is much higher than triodes the relatively few parts required to construct this modern xmitter actually effects a saving. In addition to this the final amplifier requires no neutralizing which greatly simplifies putting it on the air. In the R.F. end of this transmitter one section of a 6A6 tube is used as a crystal...

Watt Amplifier

This amplifier will fully modulate a 75 watt transmitter. When used in conjunction with the transmitter described on page 24, use transformer type T260 instead of T456. 77 tubes 6 tubes 2A3 tubes 82 tube 85 tube Tl Input transformer type T3 T2 Input transformer type T256 T3 Modulation transformer type T456 T-4 Power transformer type T215 Ll Audio Reactor type T158 L3 Swinging choke type T510 A 150 WATT C. W. 35 WATT PHONE TRANSMITTER THIS transmitter is of particular interest to the amateur who...

Modulation Unit

T2 Interstage transformer type T51 T3 Modulation transformer type T490 Vl type 76 tube V2 type 76 tube V3 type 42 tube Tl 866 Filament transformer type T360 T2 Plate transformer type T658 T3 Filament transformer type T370 T4 203A Filament transformer type T365 Ll Filter choke type Tl68 L2 Filter choke L3 Filter choke L4 Filter choke Vl, V2 rype 866 tubes V3 type 83 tube Cl, C2 2 mfd. 1500 volt C3, C4 8 mfd. 600 volt

Rf Power Supply

2,500 ohm 50 watt 20,000 ohm 50 watt Vl Output transformer Power transformer Plate reactor Swinging reactor Filter reactor type T454 type T248 type T155 type T506 type T157 R2 1.500 ohm 1 watt R3 250 M ohm 1 watt Cl 10 mfd. 25 V electo. condenser C2 2 mfd. 600 V electo. condenser C3 .05 mfd. 600 V paper condenser C5 8 mfd. 600 V paper condenser C6 10 mfd. 50 V paper condenser Tubes V2 59 tube V3, V4 59 tubes V5 83 tube

Letter Symbols for Vacuum Tube Notation

Grid potential of grids 1, 2, 3, . . . Grids are Egi, Egt, numbered in order of proximity to cathode Eg, Grid conductance J . fire Plate-filament capacity Cpf Filament capacity Cgj Cpf Cy Small letters refer to instantaneous values. The inductance of single-layer coils for transmitters and receivers are easy to calculate from the following formula where L is the inductance in microhenrys -4 is the mean diameter of the coil in inches B is the length of winding in inches X is the number of turns....

Kenograf

OHMS-CURRENT-DECIBELS CONVERSION GRAPH This graph may be used to find ohms, current and level in decibels, e.g What is the level in decibels at 600 ohms at a current of 10 M.A. Enter the graph 0 db007 600 hmS ad rea lt i wherg the siant'S 10 M.A. line intersects. From this point, project horizontally to the left, and read Rtad Pout' Ratios Direct. Voltage and Current Ratios multipl db b

Kenyon Transformer Co.inc

Including fourteen pages of SEN-O-GMFS and useful radio data 840 3ARRY STREET, NEW YORK, N. Y. 25 Wdrren Sir e-t Cdblo Adders New York. N. Y. 5I.MONTRICE NEW YORK In addition to the T line products shown on pages 61, 62 and 63 of this manual the Kenyon Transformer Co Inc also manufacture a complete line of Laboratory Standard. Portable. Silver and Replacement units. Facilities are available to manufacture transformers and reactors up to 50 KVA. If interested in special broadcast or power...

Watt Meter Phone Transmitter

TTERE is a radio phone transmitter ideally suited to the beginner in amateur radio activities. Receiving type tubes are used throughout thus making the initial investment slight. Its features are as follows a minimum number of tubes, few components, simple construction, and stable dependable operation. The functions of the tubes as shown in the schematic diagrams as shown below and on the opposite page are a 2A5 oscillator link coupled to two 45's in parallel. These parallel tubes operate as a...

Meter Transmitter And Receiver

'T1 HIS circuit differs from the standard transceiver in that separate tubes are used for the oscillator of the transmitter and the detector of the receiver. Because of the difference in the requirements for these two components of the system, it was found that the common method of using only one tube for both operations with a change-over switch for shifting from one to the other, was not entirely satis-factor '. If the constants were adjusted for receiving, the oscillator characteristics were...

Vi

His knowledge and his station are always ready for the service of his country and his community. HIS manual has been prepared to serve a real and growing need among the amateur fraternity for a more practical transmitter manual than has heretofore been offered by existing publications. On the following pages will be found what is probably the most carefully selected and comprehensive group of transmitting circuits ever compiled in a single book. The various circuits...

Rf Operation Of Screengrid Tubes

Suppressor Grid Modulation

Notes on the Application oi Tetrodes and Pentodes to Amateur Transmitters. Screen-grid tubes are old in amateur practice as anyone who made use of the 865 at its introduction will testify. The general use of the screen-grid tube in the amateur transmitter did not become common, however, until the advantages of the 47 as a crystal oscillator were discovered, and the greatest step of all came with the introduction of suppressor-grid modulation to American amateurs by James Lamb in the early part...

International Amateur Prefixes

ABYSSINIA Ethiopia AF ET ALASKA NA _ 1K7 ALBANIA E . ALGERIA AF FA ANDORRA E ANGOLA AF I 7CR6 ANTIGUA NA _ VP2 ARGENTINA SA __ ' LU ASCENSION AF ZDS AUSTRALIA O I VK AUSTRIA E azores af . CT2 Ii AHAMAS NA BAHREIN ISLAND A 7vs8 barbados na BELGIAN CONGO AF ON BELGIUM E ON BERMUDA NA . _ VP9 BRAZIL SA BRITISH GUIANA SA _ VP3 BRITISH HONDURAS NA VP1 BR. SOLOMON ISLANDS 0 _ VR4 cameroon's British af i zd2 CANAL ZONE CAPE VERDE AF ______________ _ _ CR4 CEYLON A __ VS7 CHILE SA _ .CE CHINA A...