I carried out some very basic tests today to determine whether the keying waveform and characteristics of my K2 (#5390) was acceptable. I set up the K2 in one room running at 10 watts output on 28200 into a dummy load, sending a string of cw dots. In another room I set up an Icom IC-781 on receive, preamp and spectrum scope on. The spectrum scope in the 781 has a dynamic range of 60db and sensitivity of 0.32 microvolt according to the spec. Receive antenna was 2 ft of wire in the 781. With no antenna connected to the 781 the 'residual' signal radiated by the dummy load (DL2500) was barely perceptible in the noise floor, with the 2 ft antenna the signal reistered about S9 on the 781 S meter with the preamp on.
With the spectrum scope bandwidth set to +/- 25khz the cw waveform of the K2 looked very clean, with smooth skirts, at least as narrow as the marker signal generated from the 781. No spurii, clicks or modulation detected either on the spectrum scope or audibly when tuning around in the vicinity of the K2 signal on the 781. I also checked the signal on the AM position on the 781 and it sounded clean with no trace of low frequency modulation.
Very basic admittedly but encouraging so far. A tropical cyclone has just arrived in Hong Kong so I have put off giving the K2 its first on air /P test until better weather prevails.
73
Wyn, VR2AX
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