[Elecraft] K3 APF Adjustable Q

[juergen]

Hi Morris

The IC7600 has some kind of Q adjustment in its APF feature. The Icom IC7600 has "SOFT" and "SHARP"settings for the APF. This is also combined with the WIDE, MID  and narrow settings for the APF. This would be similar in operation to having a dedicated Q control. In all honesty the APF as implemented in the FT1000D works better than that in the IC7600. On any setting of the IC7600's APF control it is not worth  engaging most of the time.

APF has to be an instantaneous control that does not require a multiplicity  of settings. The one in the FT1000D is a  dream on the low bands. 

Out of curiosity what radio has a APF filter with a Q control? 

I have a old Mizuho AP-1D Audio Processor/peak filter. This APF filter has a fixed bandwidth of 900hz and its variable from 500 to 1000hz. It does not have a Q control however it works better than the one in the Icom 7600.


73
John



--- On Fri, 10/29/10, Roy Morris <w4wfb at carolina.rr.com> wrote:

> From: Roy Morris <w4wfb at carolina.rr.com>
> Subject: [Elecraft] K3 APF Adjustable Q
> To: elecraft at mailman.qth.net
> Date: Friday, October 29, 2010, 8:08 PM
> An adjustable Q would be a desirable
> APF feature.  Also the SHIFT control needs to be more
> responsive.  It sometimes doesn't keep up with changes
> while sweeping the peak frequency.  I hope these tweeks
> can be added in future firmware.  Thanks,  Roy
> Morris  W4WFB
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