Having finally got my KSB2 board working (it was a hi-resistance solder joint: enough to depress performance but not stop all signals), and calibrated the dial, I turned to setting up the filters.
I started with the filter widths and BFO settings in the KSB2 manual, but it didn't sound right. So I decided to use WWV and Spectrogram. Now that I knew that the VFO was OK, I set it to 10000.00. No audio on LSB or USB, which is good. I then tuned off by 600Hz to create a steady signal at 10000.60kHz (9999.40kHz on the other sideband) and displayed the audio on spectrogram with a 600Hz marker set. I then went through CAL FIL, adjusting the BFO so that the audio tone was exactly 600Hz. I did this on all modes and filter widths: except FL4 on LSB and USB, which I adjusted for a 1000Hz centre (so I can use them for PSK31). I was surprised how far off the displayed spectrum was with the factory settings. On USB FL4, the centre was at 400Hz with the manual’s suggested BFO setting. 73, Gareth M5KVK ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
