[Elecraft] K3s Crystal Filter Config Qustion

[Dick Dievendorff]

Only one filter is used at a time. They are not cascaded. Check all the boxes for which the filter might be useful.  K3 firmware selects the crystal filter based on the bandwidth you choose with the width knob, from those filters you choose to enable for the mode you are in.

For example, if you enable all the filters for CW, you should be able to see which Xtal filter is used from the LCD display as you change the bandwidth knob.  If you have, for example a 250, 400, and 2.7 kHz filter and all are enabled in CW, then at bandwidths 250 and below the 250 Hz filter is chosen, bandwidth 300 to 400 the 400 Hz filter is chosen, and above bandwidth 450 the 2.7 kHz filter is chosen.

This all applies for receive.

For TX, the rules are pretty rigid, and only one filter is involved per mode.

73 de Dick, K6KR


73 de Dick, K6KR

> On Jul 3, 2016, at 07:23, Bill Leonard N0CU <billincolo73 at gmail.com> wrote:
> 
> I am uncertain on how to configure the radio's filters using the K3 Utility.
> I have the 6 KHz & 2.8 KHz filters. I am totally confused by Cady's book,
> which shows (pg 27) almost all of the ENABLE boxes checked. This doesn't
> make any sense to me since I doubt the hardware can be configured with all
> four filters inline, and even if it could, why would anyone want to use a
> 350 Hz filter on AM.
> 
> I assume that I check one box for each mode depending on which filter I want
> used.
> 
> Thanks,
> 
> Bill  N0CU
> 
> 
> 
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