Re: [Elecraft] K3: roofing filter configuration settings

2016-02-11 Thread Ed Muns
"Configuration bandwidth" is the DSP bandwidth at which the given crystal filter engages in the K3/K3S. This crystal filter remains engaged as the DSP bandwidth is narrowed, to the point where another crystal filter's "configuration bandwidth" is reached. In choosing the configuration bandwidth,

Re: [Elecraft] K3: roofing filter configuration settings

2016-02-10 Thread Joe Subich, W4TV
On 2/10/2016 11:12 AM, j...@kk9a.com wrote: > This sounds like a great idea. I used Inrad 250Hz filters in my Yaesu > FT1000MP Mark-V and they worked great on RTTY but I found the 250Hz > setting to be too narrow on my K3S. The INRAD filters are spec'd for -3dB bandwidth. This goes way back to

Re: [Elecraft] K3: roofing filter configuration settings

2016-02-10 Thread j...@kk9a.com
This sounds like a great idea. I used Inrad 250Hz filters in my Yaesu FT1000MP Mark-V and they worked great on RTTY but I found the 250Hz setting to be too narrow on my K3S. Is anyone doing this? John KK9A RLVZ at aol.com RLVZ at aol.com Wed Feb 10 00:05:30 EST 2016 A question regarding roofing

Re: [Elecraft] K3: roofing filter configuration settings

2016-02-10 Thread Guy Olinger K2AV
What the K3 contesters around here have done with the "400" and "250" roofing filters is assign them 450 and 350. For someone running in a contest, those are meaningful settings where is is *desired* to have the DSP and roofing skirts concurrent for sharp adjacent channel rejection. As to where th

Re: [Elecraft] K3: roofing filter configuration settings

2016-02-10 Thread Bob McGraw K4TAX
Filter bandwidth is defined by two points either across the top or at the knee of the filter. If the knee is 250 Hz wide at the 3 dB points then measuring the 6 dB points may be 370 Hz wide. So without the position of the filter where the measurement takes place, the number relating to bandwi

Re: [Elecraft] K3: roofing filter configuration settings

2016-02-10 Thread Arie Kleingeld PA3A
Hi Dick, Just do it. If you need a certain bandwidth for a certain mode, use the narrowest roofer you have in there; just like in any other conventional transceiver. So if you want 350Hz as bandwidth, use that 250 filter (which is actually 370). That's common sense. Don't let the 250Hz tag on

[Elecraft] K3: roofing filter configuration settings

2016-02-09 Thread Dick via Elecraft
A question regarding roofing filter "configuration bandwidth" settings on the K3: The factory default roofing filter "configuration bandwidth" setting is to set the 250hz filter at a setting of "250". Therefore, the 250hz roofing filter will engage at the same time as the 250hz DSP filter.