Kenwood SM-230 Manual

Also see for SM-230: Instruction manual

5. DIRECTIONS FOR USE5-3-2. Initial SetupWhen using for the first time, observation can be conduct-ed immediately if the controls are set as follows:MONIMAXCenterFunctionRF ATTCenter10~ 100 HzCenterSWEEP RANGEH. VARIABLEFOCUSINTENSITYCenterCenterTable 3Note that when operating in the MONITOR mode, the fol-lowing controls do not operate:V. ATTV. VARI.GND switchAC/DC switch5-3-3. Observation of Transmitted WaveformsSet the controls of the SM-230 as shown in Table 1. Ad-just the transciever to the best possible settings for trans-mission and hook up the microphone. If the unit is set totransmit and sounds are spoken into the microphone, waveforms will appear on the SM-230’s CRT.If the waveforms do not appear, adjust the <1» andknobs so that the waveforms come to the center of the CRT.Next, adjust the INTENSITY of the trace as needed and ad-just the FOCUS so as to produce an easily-viewed image.Adjust the RF ATT, SWEEP RANGE, and H. VARI to bringthe waveform to the appropriate size.sareesgeCarrier leakage occuringSingleToneInputideal waveformFigure 6 shows the waveform that results if the transcieveris placed in the SSB mode, the SM-230’s TONE generatoroutput is input into the transceiver’s MIC terminal, and aSINGLE TONE modulation is applied. (Refer to Table 3 forthe knob settings, and set the TONE switch to either1,000 Hz or 1,575 Hz.)Figure 7 is the waveform that results when both the1,000 Hz and 1,575 Hz of the TONE SW are both set toON. In this case, waveforms such as Figure 10 (A) may oc-cur, that lack the constrictions. This indicates that thebalance has deteriorated slightly, due to factors such as thevalue of the transciever’s IF crystal filter or the frequencycharacteristic of the MIC AMP.Adjust the TWO-TONE balance knob to obtain a normalwaveform as shown in Figure 10 (B). Perform the adjust-ment in either the LSB or USB mode, whichever one is usedmore frequently.The amplitude of the TWO-TONE signal can be adjusted us-ing the TWO-TONE output voltage adjustment knob locat-ed on the side panel of the SM-230.Figure 9 shows representative waveforms that result fromspeaking into a microphone connected up to the transceiver.Figure 9 shows waveforms resulting from hooking a key upto the receiver and keying in the CW mode.(A) before adjustment(B) after adjustmentTWO-TONE OutputVoltage AdjustmentFigure 10. Two-Tone GeneratorWavformsOutputfor“‘AH’’Vowel Ideal waveformOX? OOMIC gain too highFigure7.TWO-TONEModulatedOutputIdeal waveform12| MIC gain too highGABAKeyingWaveformsIdeal waveform With key click Dirty contact points