入力バンドパスフィルタ特性
Input Band Pass Filter Characteristics

Input Band Pass Filter consists of 3 sections. Each section is adjusted to tune some frequency so that best transmission characteristics are obtained. To do this, following two conditions are applied and measured.

Type A: 2210Hz--2125Hz--2295Hz
Type B: 2295Hz--2125Hz--2295Hz
入力のバンドパスフィルタの特性を調整。 フィルタは3セクションあり、次の2種類の特性を測定しました。

Aタイプ:2210Hz−2125Hz−2295Hzに調整。

Bタイプ:2295Hz−2125Hz−2295Hzに調整。

Measured BPF Characteristics
--Input Freq.(Hz) vs. BPF out (mV)--

Type A showed an excellent results and thus Type A is applied to proposed ST-6.
In type A measurements,

*:-3dB bandwidth is measured to be 280Hz. This corresponds to Quality Factor of Coil, Q, be 7.9 (= 2210Hz / 280Hz).
*:Loss is measured as 3.88dB from the ratio of Output(16mV) / Input(25mV).

For your reference, measured unloaded Q of experimental coil is 34, and the inductance is 22mH.

採用したのは、このAカーブの調整をしたもの。

−3dBバンドB幅は280Hzあるので、Q=2210Hz/280Hz=7.9となる。

損失は入力25mVに対して16mV出力なので、3.88dB.

コイルのアンローデッドQは実測で34。インダクタンスは22mH.

measured on Dec. 9, 1990 by JA1JTA, Home Page Revised on Oct. 10, 1996


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