Antenna system of a radio microphone

A technology of antenna system and microphone, applied in the direction of transmission system, electrical components, network improvement to reduce the influence of temperature changes, etc., capable of solving problems such as noise factor and/or intercepting adverse effects

Active Publication Date: 2015-06-03
AKG ACOUSTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Also, these controllable attenuators generally have an adverse effect on noise figure and / or intercept

Method used

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  • Antenna system of a radio microphone
  • Antenna system of a radio microphone
  • Antenna system of a radio microphone

Examples

Experimental program
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Effect test

Embodiment

[0050] If you have an amplifier with a gain of 17dB, a series circuit of amplifier, properly chosen slope attenuator and RF cable (length in 1dB steps) will always give a constant frequency response around 0dB.

[0051] However, since initially it is not known which adjustment should be chosen for the slope attenuator (cable length is unknown), it is necessary to simply compare the values ​​of the two RF level meters to each other and the slope attenuator to vary until the two measured values ​​are the same or until the difference is minimized.

[0052] By limiting the above-mentioned cable types to specified qualities, it is thus possible to use measurements at any frequency point to optimally tune systems with unknown cable lengths.

[0053] If this limitation does not apply to certain RF cables, the base attenuation and slope must be measured at at least two frequency points and adjusted separately from each other.

[0054] The antenna system may eg consist of a booster (=...

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Abstract

The invention concerns an antenna system of a radio microphone, containing an antenna path starting at an In port (2), and ending at an Out port (6), with an amplifier (3) and a RF cable (5). In order to compensate for various cable attenuations, an attenuator (4) is provided in series with a variable slope compensator (7) between the amplifier (3) and the RF cable (5). In order to avoid the negative effect on large signal behavior of variable slope compensators according to the prior art, FETs or pin diodes or similar "micro-switches" are used for switching of the resistances, but only as pure switches without an effect on the signal, so that an excellent large signal behavior is achieved.

Description

technical field [0001] The invention relates to a radio microphone, in particular its antenna system according to the preamble of claim 1 and US Pat. No. 5,144,267. Background technique [0002] Different cable attenuations occur in antenna systems of radio microphones. This has to be taken into account, in which case amplification control is required in the antenna to compensate for cable attenuation by means of active components in order to maintain the best possible combination of interception and noise figure. Due to the frequency-dependent attenuation of the cables in the antenna system, an optimal combination of interception and noise figure is only possible at one frequency point in a broadband amplifier, regardless of whether it is controllable or constant amplification. To this, it must be added that the slope of the frequency-dependent attenuation varies with the cable length, so that an additional parameter has to be considered. [0003] This so-called slope com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H11/02H03H11/54
CPCH04B1/18H04R2420/07H04R1/08H04R2499/11
Inventor H.科夫勒
Owner AKG ACOUSTICS
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