Re: [Elecraft] (K3) APF and selected bandwidth

2016-10-17 Thread Bill W4ZV
(BTW I wrote the following ~3 years ago before APF was changed from HOLD to TAP on DUAL PB): ## I use APF virtually all the time and never use RIT, SHIFT, etc. Just HOLD DUAL PB to actuate APF and use the VFO to zero beat. COARSE (10

Re: [Elecraft] (K3) APF and selected bandwidth

2016-10-16 Thread David Blake via Elecraft
th.net] On Behalf Of brian Sent: Sunday, October 16, 2016 9:43 AM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] (K3) APF and selected bandwidth Part of the problem with narrower bandwidths is making sure the signal is at the APF peak. I had fits trying to use APF with 200-400 Hz dialed in until I la

Re: [Elecraft] (K3) APF and selected bandwidth

2016-10-16 Thread Robert W5AJ Wood
...@mailman.qth.net] On Behalf Of brian Sent: Sunday, October 16, 2016 9:43 AM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] (K3) APF and selected bandwidth Part of the problem with narrower bandwidths is making sure the signal is at the APF peak. I had fits trying to use APF with 200-400 Hz dialed

Re: [Elecraft] (K3) APF and selected bandwidth

2016-10-16 Thread brian
Part of the problem with narrower bandwidths is making sure the signal is at the APF peak. I had fits trying to use APF with 200-400 Hz dialed in until I launched Spectrogram and made sure the signal peak aligned with the APF peak. Weak signals still show even when you have trouble hearing

Re: [Elecraft] (K3) APF and selected bandwidth

2016-10-16 Thread Chip Stratton
I seem to recall a recommendation to use a 400 Hz bandwidth with APF. In my own exerience, narrowing DSP bandwidth much below this does not seem to help APF function and rather muddies it. Chip AE5KA On Sat, Oct 15, 2016 at 11:44 PM, Brian Hunt wrote: > On the other

Re: [Elecraft] (K3) APF and selected bandwidth

2016-10-15 Thread Brian Hunt
On the other hand, when used in conjunction with NR a wider DSP BW is desirable since NR works on uncorrelated noise. Try: BW= 700-1000 Hz, NR= ~ 5-3 APF= ON Great for pulling out weak signals on an uncrowded band. The NR settings of 5 and above mix processed and non-processed data so the APF

Re: [Elecraft] (K3) APF and selected bandwidth

2016-10-15 Thread Ken Arck
The narrower the bandwidth, the better signal to noise. That should answer your question :-) Ken At 07:39 PM 10/15/2016, Robert G Strickland wrote: When using the APF, does it make a difference which bandwidth has been selected? Or in other words, does APF work better on top of a narrow or