US 2697207 A
Description (OCR text may contain errors)
Dec. 14, 1954 N. J. THOMPSON 2,697,207
COMBINED RELAY AND DIRECTIONAL COUPLER Filed April 25, 1952 14' if 41 42 22 I 27 I 2 r Z3 Z] 36 5a 37 i 39 25 2a J0 9 Z9 1a 11;
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Wal z of Ziramwzsmy BY United States Patent Otiiice 2,697,207 Patented Dec. 14, 1954 COMBINED RELAY AND DIRECTIONAL COUPLER Noel J. Thompson, Cedar Rapids, Iowa, assignor to Collins Radio Company, Cedar Rapids, Iowa, a corporation of Iowa Application April 25, 1952, Serial No. 284,402 1 Claim. (Cl. 333-7) This invention relates in general to a combination switching and power measuring device.
It is oftentimes desirable in radio communications to use a single antenna for transmission and reception of energy.
It is an object of this invention to provide a combination power measuring and switching means.
Yet another object of this invention is to provide an automatic switching means wherein the contact switched is coupled to the power measuring device.
Further objects, features and advantages of this invention will become apparent from the following description and claim when read in view of the drawings, in which:
Figure 1 illustrates the apparatus of this invention, and
Figure 2 is a sectional view of the apparatus of Figure 1.
Figure 1 discloses a transmitter 10, a receiver 11, and an antenna 12 which are connected, respectively, to a switching and power measuring device 13. A pair of indicating dials l4 and 15 are mounted to a projection 16 attached to the member 13. A relay 17 is also attached to the member 13.
As shown in the sectional view, Figure 2, the body portion 13 is formed with an internal generally cylindrical opening 18. The input lines'19, 20 and 21 from the transmitter, receiver and antenna, respectively, have their outer conductors connected to the body portion 13. The body portion 13 might be made of copper, for example.
The inner conductor 22 of line 19 is connected to an internal contact 23 which is mounted within one end of the generally cylindrical opening 18. The center contact 24 of line 20 is connected to an internal contact 26 within the opening 18 and adjacent the contact 23.
The center contact 27 of the line 21 is connected to a contact 28 at the opposite end of opening 18.
A flexible conducting member or spring 29 is permanently fastened to the contact 28 and has an engaging portign 30 which may be moved between the contacts 23 and 2 An opening 31 is formed through the body portion 13 and an insulated plunger 32 is received therethrough. The plunger 32 engages the member 29. The spring 29 is made of conducting material and is normally biased so as to engage the contact 26. The plunger 32, however, can move it so that it engages contact 23. The relay 17 has a movable armature 33 that has a lever 34 attached thereto. The lever 34 is engageable with the plunger 32 to move it when the relay is energized.
A coupling loop 36 extends through a pair of openings 37 and 38 formed in the body member 13 and is insulated therefrom. A portion 39 of the conductor 36 is parallel to the spring 29. Opposite ends of the conductor 36 are attached to resistors R1 and R2 and diode rectifiers 41 and 42. Condensers C1 and C2 are connected across the other side of the diodes 41 and 42, and meters 14 and 15 are connected between the diodes and ground.
The conductor 36, in combination with the resistors R1 and R2, condensers C1 and C2, the diodes 41 and 42, and
the meters 14 and 15, form a double reflectometer capable of measuring reflected and incident power. Such directional couplers are known to those skilled in the art and for a more detailed description, reference may be made to Patent No. 2,423,390.
In operation, when it is desired to transmit, the relay 17 is energized, thus moving the spring 29 to engagement with the contact 23 and the directional coupler measures the incident and reflected power to and from the antenna 12. One of the meters 14 measures the reflected power and the other measures the incident power.
When it is desired to receive, the relay is de-energized and the spring 29 engages contact 26 and thus connects the antenna directly to the receiver 11.
Since directive couplers normally are used in the power range where more than a few watts are being transmitted or received, the coupler will be inoperative during the receiving portion of the cycle. This is true because generally energy received is at a very low level.
However, when transmission occurs the meter 14 and 15 will measure the reflected and incident power. It is to be noted that the spring 29 forms the center conductor between the line 21 and the lines 19 and 20. is required that the capacitive and inductive coupling between the loop 36 and the spring 29 be equal for the position in which contact 30 engages transmitter contact 23. This principle of directive couplers is more fully set forth in the above mentioned patent.
. It is seen that this invention provides means for reading power and simultaneously switching from transmit to receive.
Although this invention has been described with respect to a particular embodiment thereof, it is not to be so limited as changes and modifications may be made therein which are within the full intended scope of the invention, as defined by the appended claim.
Unitary apparatus for alternately switching a first conductor from a second conductor to a third conductor and measuring incident and reflected power when connected to the second conductor comprising, a body portion formed with a generally cylindrical opening, first, secondand third coaxial cables fastened to said body portion with the outer conductors grounded to said body portion, the inner conductors of said coaxial cables extending withinthe confines of said body portion and terminating withinsaid cylindrical opening, a flexible conductor connected to the first of said inner conductors within the cylindrical opening, the free end of said flexible conduc tor movable between first and second positions to contact the second and third inner conductors respectively, actuating means mounted on one side of said body portion for moving said flexible conductor, a coupling loop mounted on the opposite side of said body portion adjacent said flexible conductor, the inductive and capacitive coupling between said loop and said flexible conductor being of equal value when said conductor is in said first position, a directive coupler connected to said conductive loop the coupling between said loop and said flexible conductor being effective when said flexible conductor is in said first position to render said coupler operative to indicate the reflected and incident power.
References Cited in the file of this patent