Re: [Elecraft] K3 5 pole vs 8 pole filters - attenuation in the passband

On Sat,2/27/2016 9:33 AM, Richard Ferch wrote: My solution for this is to configure the K3 to switch the 250 Hz roofing filter in at 350 Hz. A DSP filter of 250 Hz is a bit narrow, but with a 350 Hz DSP setting and the 250 Hz roofing filter, I still get good copy. WK6I wins RTTY contests.

Re: [Elecraft] K3 5 pole vs 8 pole filters - attenuation in the passband

I find that the biggest use for the "250" filter, which really is ~350, is to narrow a run station passband when the band gets crowded. These days that's almost always. I find a place where the "400" really 450, does not contain other stations, and then operate at 350 Hz bandwidth. I use the "400"

Re: [Elecraft] K3 5 pole vs 8 pole filters - attenuation in the passband

The Elecraft/Inrad "250 Hz" filter is actually 370 Hz at -6dB where the "400 Hz" filter is 435 Hz. That's not enough to make a real difference *as a roofing filter* since the primary selectivity of the K3/K3S is in the DSP. 370 Hz is the minimum necessary bandwidth for a 170 Hz shift 45.45

Re: [Elecraft] K3 5 pole vs 8 pole filters - attenuation in the passband

My solution for this is to configure the K3 to switch the 250 Hz roofing filter in at 350 Hz. A DSP filter of 250 Hz is a bit narrow, but with a 350 Hz DSP setting and the 250 Hz roofing filter, I still get good copy. That being said, most of the time I operate RTTY with a 500 Hz roofing

Re: [Elecraft] K3 5 pole vs 8 pole filters - attenuation in the passband

On Sat, Feb 27, 2016 at 7:56 AM, lstavenhagen wrote: > I'm 99.9986% CW, so that filter is adequate for me but if you're a PSK > hound, for example, I could see the 250hz filter. For RTTY, I think the > 250hz filter might be borderline, though... > For RTTY the sweet

Re: [Elecraft] K3 5 pole vs 8 pole filters - attenuation in the passband

I have both the 8 pole 400 Hz and 250 Hz filters. For CW, I just haven't found the 250 Hz filter that useful. For one thing, it's not really that much narrower than the 400 Hz filter. I do find that a bandwidth less than 400 Hz is sometimes useful in heavy QRM, but I think the 400 Hz filter

Re: [Elecraft] K3 5 pole vs 8 pole filters - attenuation in the passband

for what it may be worth, the 400hz 8 poles in my K3 and K3S are like brick walls. I haven't yet found a situation where the 400hz filter plus using the DSP to go narrower hasn't covered even the most crowded situations. I'm 99.9986% CW, so that filter is adequate for me but if you're a PSK

Re: [Elecraft] K3 5 pole vs 8 pole filters - attenuation in the passband

Well, no longer a question. The 5 pole 200 is no longer available. Sent from my iPhone ...nr4c. bill > On Feb 26, 2016, at 5:03 PM, Gary Smith wrote: > > Interesting timing for this thread. A friend wants to buy my K3 and > fit it with the most advantageous filters for his

Re: [Elecraft] K3 5 pole vs 8 pole filters - attenuation in the passband

Interesting timing for this thread. A friend wants to buy my K3 and fit it with the most advantageous filters for his contesting methods. I remember when selecting filters back in 2009, the consensus was the 8 pole 250 Hz filter was more desirable than the 5 pole 200 Hz filter. Now its 7 years

Re: [Elecraft] K3 5 pole vs 8 pole filters - attenuation in the passband

Well, yes, to spill the beans on this: it was when I was reviewing the filter gains on my K3 the other day that this came up. I built my K3 with the stock 2.7khz 5 pole filter in FL1 and an 8 pole 400hz in FL2 - however, to even out FL1 and FL2 requires the gain to be nearly maxed out for FL2 (8

Re: [Elecraft] K3 5 pole vs 8 pole filters - attenuation in the passband

On Fri,2/26/2016 8:50 AM, lstavenhagen wrote: Quick question - do the 8 pole roofing filters have more attenuation, as a general rule, in their passbands than the 5 pole? Yes, but the difference doesn't matter -- it's in the IF, not the front end. Further, there is an menu adjustment for each

[Elecraft] K3 5 pole vs 8 pole filters - attenuation in the passband

Hi all, Quick question - do the 8 pole roofing filters have more attenuation, as a general rule, in their passbands than the 5 pole? Long story on how I arrived at this question in terms of troubleshooting something I've noticed in my K3 and K3S, but I'm just curious if there's supposed to be a