Kenwood DSP100, digital signal processor used. I used it for experiments before, but it is no longer necessary.
-455KHz output generator with AM, SSB. FM, CW, FSK mode specifications (can be received).
・ How to use this machine is described in detail in HAM Journal 74.
・ I think there is no problem as far as I notice. I think that the inside appearance is beautiful for the age.
-We will attach the jig that we made in the previous experiment. Up to the third photo is the exhibition item.
-It is a reference because it is an amateur measurement that measured in USB mode for exhibition.
Photo 3 and jig have a microphone input and clock reference input connector from the DSP3 connector on the main unit, so if you input a microphone and 10 MHz 0 dBm, a USB output of 455 kHz can be output in local mode.
Photo 4 shows the connection for this measurement. Some items that are not exhibits are included.
-Photo 5, the reference clock input to the main unit is set to the 10MHz side switch.
-Photo 6, Local mode When controlling TX / RX from the main DSP3-pin 13, this TXB-TX / RX jumper is required. IC pin socket is soldered so that this jumper can be connected easily. The pins are soldered to a different location from the original silk screen, but there was a mistake in the Kenwood silk screen.
-Photo IMD characteristics output with the two-tone function of the main unit turned on.
・ Photo 8 shows a characteristic screen with white noise added to the microphone input and averaged. The transmission band is at the widest setting of 100Hz to 3100Hz.
-Photo 9, IMD reference characteristics when 2 Tone is input to the microphone input.
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