JPH0131990Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to the structure of an adjustment knob that directly displays the receiver bandwidth and 1F shift amount. It is effective.

FIG. 1 is an exploded external view showing the structure of the knob of the present invention, in which a notch 12 is formed in the skirt portion 11 of the inner shaft adjustment knob 10 fixed to the inner shaft 1 of the double shaft.
(The outer periphery of the notch may be left as an opening.)
The skirt portion 21 of the inner shaft adjustment knob 20 fixed to the outer shaft 2 has a structure inscribed in the skirt 11 of the inner shaft adjustment knob, and the notch portion of the inner shaft adjustment knob is provided on its surface. 12 (or an opening) and is colored, for example, as an identification mark 22 of the position and size corresponding to the opening.

When in use, attach the above-mentioned knob 20 to the outer shaft of the two-axis double variable resistor for IF shifting and variable bandwidth in the above "Adjustment circuit configuration", and attach the knob 10 to the inner shaft. so that the identification display 22 appears to match the notch 12 at the center position of the rotation range.
Fix the knob as shown in Figure 2A. In this state, the receiver's bandwidth is at its specified maximum, and the receiver circuit is adjusted so that the center frequency of the IF filter matches the center of the sideband.

FIG. 2B shows a state in which the inner shaft knob is turned to the right and the left half of the identification display 22 is covered with the skirt portion 11.
In terms of circuit operation, this means that the bandwidth (from the low frequency side of the sideband, for example) is approximately halved. In addition, Fig. 2C shows that when the inner axis knob is turned to the left to cover the right half of the identification display 22, the bandwidth is almost halved (for example, from the high frequency side of the sideband) in terms of circuit operation. means. Furthermore, in Fig. 2 D, only the outer shaft is turned to the right to display identification 2.
The right half of 2 is hidden under the skirt part 11, but the display 22 is visible from the surface as shown in B and D.
If the position and width of the signals are the same, it means that the effect on reception will be the same, and the actual operation will also be the same. Similarly, C and E have the same effect.

In Figure 2 F, turn the inner shaft to the left and the outer shaft to the right.
This means that when the width of the display 22 is narrowed at the center position, the band is reduced from both heights and low sides with respect to the center of the sideband.

Next, in Fig. 2 G, the inner and outer axes are rotated counterclockwise in conjunction with each other, the bandwidth remains at maximum, and the relative position of the sideband with respect to the filter is changed.
It means IF shift operation. This can be done even when the bandwidth is narrowed, so you can arbitrarily adjust the bandwidth and IF shift by moving the double knobs separately or in conjunction with each other, and the result is This can be seen directly from the width and position of the knob identification display, so the practical effect is extremely large.

[Brief explanation of drawings]

FIG. 1 is an exploded external view of the knob of the present invention, and FIG. 2 is an explanatory diagram of the operation of the knob of the present invention. 1...Inner shaft, 2...Outer shaft, 10...Inner shaft knob, 11, 21...Skirt portion, 20...Outer shaft knob.

Claims (1)

[Scope of utility model registration request] An opening or notch is provided in the skirt of the inner shaft adjustment knob that is fixed to the inner shaft of the double shaft of the double variable resistor, and the outer shaft adjustment is inscribed in the skirt and fixed to the outer shaft of the double shaft. The skirt part of the outer axis adjustment knob is arranged, and the surface of the skirt part of the outer axis adjustment knob is marked with an identification mark of the position and dimensions corresponding to the opening or notch of the inner axis adjustment knob. and the structure of the knob that displays the 1F shift amount.