JPS5942768Y2 - SSB/CW transceiver - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to improvements in SSB/CW transceivers.

Conventional SSB/CW transceivers are configured so that when receiving CW waves, the bandpass filter in the intermediate frequency amplification stage can be switched between a wideband filter and a narrowband filter to change the bandwidth. Only the filter was connected to the line, making it impossible to switch between wideband and narrowband.

This invention is based on the above considerations, and is based on SSB/CW.
The purpose of the present invention is to provide an SSB/CW transmitter that can switch the bandwidth of an intermediate frequency amplification stage to a wide or narrow bandwidth with a simple configuration not only when receiving CW waves but also when receiving SSB waves. It is something to do.

The purpose of this is to connect the SSB wideband filter SB narrowband filter and CW bandpass filter provided in the intermediate frequency amplification stage, and the input and output sides of the SSB wideband filter SB narrowband filter and CW bandpass filter. A switching element is connected to each of the filters separately and selectively connects each of the filters to the line using an external control signal, and a switching element or a narrowband filter for SSB is connected to the line when receiving SSB waves. selectively gives a control signal to the switching element connected to
This is achieved by providing a switching means that selectively applies a control signal to a switching element that connects the SSB bandpass filter to the line, and also applies a control signal to a switching element that connects the SSB wideband filter in at the time of transmission.

The present invention will be explained below with reference to examples.

The figure is a block diagram of essential parts of an embodiment of the present invention.

1 and 2 are, for example, double conversion type SS
In a B/CW transmitter/receiver, it is a first intermediate frequency amplifier during transmission, and a second intermediate frequency amplifier during reception, and is switched depending on the transmission and reception, but in this specification, they are referred to as intermediate frequency amplifiers without distinction.

3.4 and 5 are a wideband filter for SSB, a narrowband filter for SB, and a bandpass filter for CW, respectively.

Broadband wideband filter for SSB 3 Narrowband filter for SB 4
Switching diodes 6 to 11 are connected to the input side and the output side of the CW bandpass filter 5, respectively. narrowband filter 4, diodes 8 and 1
1 is on, the CW bandpass filter 5 is connected between the intermediate frequency amplification circuits 1 and 2.

On the other hand, the SSB broadband filter 3 has a resistor R0,
When voltage element B1 is applied to R2, R3, R4, R5, capacitor C□C2, and resistor R1, diode 6
A first drive circuit 12 is provided which applies a voltage to the anodes of S and 9 to turn on the diodes 6 and 9.
Resistors R6, R7, R8 for SB narrowband filter 4
, R9, RIO capacitors C3, C4, and when voltage element B1 is applied to resistor R6, diodes 7 and 1
Applying (g) voltage to the anode of diodes 7 and 1
A second drive circuit 13 that turns on the CW bandpass filter 5 is provided with resistors R11, R□2R13, R
14, R15, capacitors C5 and C6, and resistor R
A third drive circuit 14 is provided which applies a voltage to the anodes of the diodes 8 and 11 to turn on the diodes 8 and 11 when the voltage element B0 is applied to the third drive circuit 11.

On the other hand, the switches 15, 16, 17, 19 and the diodes 20, 21 are connected to the first, second and third drive circuits 1.
2. A switch unit is configured that selectively applies a voltage element B1 to 13 and 14 to switch the diodes 6 to 11.

The switch 15 is a switch for switching between wide and narrow bands υ,
The switch 16 is for SSB when receiving the SSB/CW transmitter/receiver.
ss Bi (not shown) that switches between wave reception and CW wave reception
It is a switch that is switched in conjunction with changeover switch No. c, is turned on when receiving a CW wave, and applies a voltage element B1 to one common contact CB of the switch 15, and the switch 17 is used for receiving the above-mentioned SSB wave (not shown). It is a switch that is switched in conjunction with the changeover switch, is turned on when receiving an SSB wave, and applies voltage element B□ to the other common contact SB of the switch 15, and the output of the contact SSN of the switch 15 is the second drive The output of the contact SCW of the switch 15 is configured to be led to the first drive circuit 12 through a diode 20.

The switch 19 is switched in conjunction with a changeover switch (not shown) that switches between transmission and reception of the SSB/CW transmitter, and is switched to the T side when transmitting and to the R side when receiving. This switch applies voltage B1 to the cathode to turn off the diode 20, and applies voltage -B2 to the anode of the diode 21 during reception to turn off the diode 21.

Note that C7 to C1□ are DC blocking capacitors.

In this embodiment configured as described above, when the SSB/CW transmitter/receiver is on the receiving side, the common contact of the switch 19 contacts the contact R side, the diode 21 is turned off, and the diode 21 can be ignored.

Switch 16 is activated when receiving SSB waves in the state of the housing.
The common contact of the switch 17 contacts the contact TB side, and the common contact of the switch 17 contacts the contact SB side.

When the switch 15 is switched to the W side in this state, that is, when it is in the position shown in the figure, the voltage element B□ appears at the contact SCW via the switch 17 and the switch 15.

Therefore, a voltage element B0 is applied to the first drive circuit 12, that is, the resistor R1, through the diode 20.

Therefore, the diodes 6 and 9 are turned on and are connected between the SSB broadband filter 3 and the frequency amplification circuits 1 and 2.

When the enclosed switch 15 is switched to the N side, the voltage element B1 appears at the contact ssN via the switch 17 and the switch 15.

Therefore, the voltage +R is applied to the second drive circuit 13, that is, the resistor R6.
0 is applied.

Therefore, diodes 7 and 10 are turned on and SS
The B narrowband filter 4 will be connected between the intermediate frequency amplification circuits 1 and 2.

In other words, when receiving SSB waves, the switch 15 switches between the SSB wideband filter 3 and the SSB narrowband filter 4.
You can switch between and insert into the line.

Next, when receiving a CW wave, the common contact of the switch 16 comes into contact with the contact CB, and the common contact of the switch 17 comes into contact with the contact TC.

When the switch 15 is switched to the W side in this state, that is, when it is in the position shown in the figure, the voltage element B□ appears at the contact SCW via the switch 16 and the switch 15.

Therefore, the voltage element B1 is applied to the first drive circuit 12, that is, the resistor R1, through the diode 20.

Therefore, diodes 6 and 9 are turned on, and SSB broadband filter 3 is connected between intermediate frequency amplification circuits 1 and 2.

In this case, the intermediate frequency signal of the CW wave is filtered by the SSB band filter 3.

Next, when switch 15 is switched to the N side, voltage element B1 appears on CWN via switch 16 and switch 17.

Therefore, the voltage terminal B is connected to the third drive circuit 14, that is, the resistance color □.
1 is applied.

Therefore, diodes 8 and 11 are turned on and the CW
A bandpass filter 5 is connected between intermediate frequency amplification circuits 1 and 2.

That is, when receiving CW waves, switch 15. By switching, the SSB wideband filter 3 and the CW bandpass filter 5 can be switched and inserted into the line.

Next, the time of transmission will be explained.

During transmission, the common contacts of switches 16 and 17 contact the contacts TB and TC, respectively, the common contacts CB and SB of the switch 15 cut off the application of the voltage element B1, and the common contact of the switch 19 contacts the contact T side. do.

Therefore, even if the switch 15 is switched to the W side, the voltage element B1 is not applied to the anode of the diode 20, and the voltage element B1 that has passed through the diode 21 is applied to the anode of the diode 20.
is applied to the cathode of the diode 20, and the diode 20 is turned off.
A voltage element B1 is applied to the first drive circuit 12, ie, the resistor R1, through the diode 21.

Therefore, diodes 6 and 9 are turned on, and SSB
A broadband filter 3 will be connected between intermediate amplifier circuits 1 and 2.

At the time of disconnected transmission, the contacts CWN and S of the switch 15 are
Voltage element B□ does not appear on SN and SCW,
When transmitting, it is always connected to the 3-in broadband wideband filter for SSB and automatically becomes wideband.As explained above, according to the present invention, the SSB/CW transmitter can switch between transmitting and receiving, and when receiving, SSB wave reception and CW wave reception are possible. By using the switch to switch between wide and narrow bandwidth, even when receiving SSB waves with simple authority, CW
The bandpass filter can be switched even when receiving waves, and the operation for switching is simple, as it can automatically switch to a wideband filter when transmitting a wave.

[Brief explanation of drawings]

The figure is a circuit diagram of a main part of an embodiment of the present invention. 3... Broadband wideband filter for SSB...
・SSB narrowband filter, 5...CW bandpass filter, 12.13 and 14...1st,
Second and third drive circuits, 15... switch for wide and narrow band switching, 16 and 17... SS
Switch for switching B wave CW wave reception, 19...Switch for switching transmission and reception.

Claims (1)

[Scope of utility model registration request] In an SSB/CW transmitter/receiver, the SSB narrow band filter and CW band filter provided in the intermediate frequency amplification stage are connected separately to the SSB narrow band filter and the CW band filter, respectively, on the power side and output side of the SSB wide band filter. A first switching element is connected to the wide band wideband filter in for SSB by a control signal, and a first switching element is connected to the input side and output side of the narrowband filter for SSB to the outside, respectively, and the narrowband filter for SSB is connected to the line by a control signal. A second switching element to be connected, a third switching element which is connected to the input side and output side of the CW bandpass filter separately and connects the CW bandpass filter to the line by a control signal, A control signal is selectively given to the housing or the second switching element, a control signal is selectively given to the first or third switching element when receiving a CW wave, and a control signal is given to the first switching element when transmitting. An SSB/CW transceiver characterized in that it comprises a switch means for giving.