Band width was 6k Hz, offset 0. When I turn the band width knob I only get a spread of 5k. Any suggestion would help.
This is normal. The "BW" display shows the audio bandwidth not the IF bandwidth. Audio bandwidth is defined as FC + WIDTH/2 In the case of [double sideband] AM, the IF bandwidth is twice that of the audio bandwidth. Thus a "6 KHz" filter provides roughly 3 KHz of audio bandwidth at -6dB (the filter is nominally 6.125 KHz wide between the -6 dB points - about 7.5 KHz at -30 dB and 9.35 KHz at -60 dB) and rolls off rather quickly above 4.2 KHz due to the audio lowpass filter that follows the digital to analog converter. If you change Shift/Width to High/Low you will notice the maximum setting for "HIGH" is 4.2 KHz - a design limit in the DSP due to the clock frequency of the digital to analog converter. 73, ... Joe, W4TV On 8/8/2016 3:35 PM, Grady Harper via Elecraft wrote:
I have just installed a new 6K AM filter in my K3s. I configured the filter by computer, and checked using CONFIG . Band width was 6k Hz, offset 0. When I turn the band width knob I only get a spread of 5k. Any suggestion would help. The filter was put in slot 1. Sent from my iPad ______________________________________________________________ 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]
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