Radio transmitter display indicator

• US 4,176,318 A
• Filed: 03/28/1977
• Issued: 11/27/1979
• Est. Priority Date: 03/28/1977
• Status: Expired due to Term

• Current Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Johnson, James A., Kerfoot, Paul E.
• Primary Examiner(s): Murray, Richard
• Assistant Examiner(s): Ng, Jin F.
• Application Number:
  US05/782,274
• Time in Patent Office: 974 Days
• Field of Search: 325/22, 325/25, 325/133, 325/176, 325/455, 332/38, 332/39, 340/660, 340/662, 340/715, 340/718, 340/719, 340/756, 340/760, 340/762
• US Class Current: 455/115.4
• CPC Class Codes: H04B 1/03 Constructional details, e.g. casings, housings
• CPC Class Codes: H04B 1/04 Circuits

Abstract

Apparatus for visually indicating a particular operational condition of a radio transmitter, such as the transmitter being activated or the percentage amplitude modulation of the transmitted carrier. An electrical or electronic character display module having an integral decimal point display portion is utilized to visually indicate a transmitter circuit condition. Transmitter activation may be shown by coupling the push-to-talk circuit to the decimal point display. More specifically, the character display module is oriented to be viewed with the decimal point portion in a superscript position relative to the character.

A method for visually indicating the operational status of a radio transmitter includes the steps of providing a character display module having an integral decimal point, generating a signal indicative of a transmit circuit condition, and activating the decimal point display in response to the indicative signal. The indicative signal may be a transmitter activation signal obtained from a push-to-talk circuit or it may be a signal indicating percentage amplitude modulation of the transmit signal. The method also includes the step of orienting the character display module such that it may be viewed with the decimal point portion in a superscript position with respect to the character.

Claims

1. Apparatus for visually indicating an operational condition of a radio transmitter comprising:

radio communication equipment having a transmit circuit for emitting a transmit signal;

at least one character display module coupled to said radio communication equipment, said module having an integral character display portion for visually indicating one operative condition of said radio communication equipment and an integral decimal point display portion;

transmit circuit condition means coupled to said radio communication equipment for deriving a signal indicative of a transmit circuit condition different from said one condition; and

means for coupling said indicative signal to said decimal point display portion to visually indicate said transmit circuit condition by said decimal display portion while said character display portion simultaneously visually indicates said one condition.

2. The apparatus of claim 1 wherein the radio communication equipment includes a push-to-talk circuit for activating said transmit circuit to a transmit condition.

3. The apparatus of claim 1 wherein the transmit signal is modulated by an information signal and wherein the transmit circuit condition means includes a circuit for deriving a signal indicative of the modulated signal condition and said indicative signal is coupled to said integral decimal point display portion for controlling the excitation thereof.

4. The apparatus of claim 3 wherein the transmit signal is amplitude modulated by said information signal and wherein the indicative circuit derives a signal proportional to the percent modulation of said transmit signal.

5. The apparatus of claim 4 wherein said indicative signal comprises a modulated DC signal which results in said decimal point display portion visually indicating during a portion of said modulated DC signal.

6. The apparatus of claim 5 wherein said modulated DC signal controls the conductive state of a transistor which controls the excitation of said decimal point display portion.

7. The apparatus of claim 1 wherein said character display module is oriented to be viewed with said integral decimal point portion in a superscript position relative to the character display portion.

8. The apparatus of claim 1 wherein said character display module is oriented to be viewed with said integral decimal point portion in a superscript position relative to the character display portion and said transmit circuit condition means comprising at least one of circuit means for deriving a signal indicative of a transmit mode operation and circuit means for deriving a signal indicative of the percent of modulation of the transmit signal having an output coupling its output signal to the decimal point display portion of said one character display module.

9. The apparatus of claim 8 which includes at least two of said character display modules, each having an integral decimal point display portion oriented in a superscript position, wherein one of said decimal point display portions receives a signal indicative of the percentage of modulation and the other decimal point display portion receives a signal indicative of the transmit mode.

10. The apparatus of claim 9 which includes a push-to-talk switch which controls the excitation of both of said decimal point display portions.

11. The apparatus of claim 10 wherein said character display portions indicate the operative channel frequency of said radio communication equipment.

12. The apparatus of claim 11 wherein said modulation indicative signal indicates the percent of amplitude modulation of the transmit signal.