On 6/24/2015 5:55 AM, Gee wrote:
with any filter selected using the XFIL button on the K3, there is only ONE crystal IF filter in the signal path.
Correct
In other words, there is no cascading or tail ending of the filters before and after the IF.
Semi-correct. If by filter you mean crystal roofing filter, and if by IF you mean 1st IF [8 MHz], correct. One roofing filter followed by 2nd IF filtering provided by the DSP.
2) if I select a 400 Hz filter
with the XFIL button then adjusting the DSP WIDTH control to any WIDER than 500 Hz is pointless.
Sort of. The K3 will automatically select a roofing filter from whatever you have that is wider than what the DSP is set to ... if it can.
3) can the DSP be bypassed to produce
a purely analog demodulated audio to the speaker?
No. Once the 15 KHz 2nd IF becomes number soup in the DSP, there are only two analog things left in the chain: The AF amplifier and you. The DSP contains a lot more than just adjustable filtering, such as AGC and demodulation.
It is interesting to note that there are new hams out there who have never listened to an analog receiver before.
True >It can be an eye opening experience! Possibly, although I doubt most would find that. 73, Fred K6DGW - Northern California Contest Club - CU in the 50th Running of the Cal QSO Party 3-4 Oct 2015 - www.cqp.org ______________________________________________________________ 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]
