[Elecraft] Fwd: [Elecraft_K3] Filter Confusion

[westalto at comcast.net]

Jim... The XTAL filters ARE the roofing filters. Due to the low IF in the K3 it is 

possible to provide very narrow filters rather than the wide filters in the 

conventional YaKenIc radios with higher IFs. The ultimate selectivity as 

determined by the DSP filtering, which is perfectly adequate. Unless you 

live in an environment or operate in high QRM situations (e.g. contests) 

you can probably get away with the stock filter for SSB and perhaps the 

400 or 500 Hz filter for CW. If you're interested in AM you will need either the 

6 or 16 kHz filters. My filters are 2.7, 6, 1000Hz and 500 Hz. I actually have 

the 400 Hz also but find that I prefer the 500. 



When you configure the radio you specify which filter is in which "slot" (up to 5). 

You can select which filter you want to use by stepping through the choices 

by using the XFIL button. Also, when you select a bandwidth with the DSP 

the radio automatically selects the appropriate roofer. 



Hope this helps. 



73, 

Doug, W6JD 

K3 #23 

K2 #1626 
----- Forwarded Message ----- 
From: "Jim Rossell" <k3qyr at yahoo.com> 
To: "Elecraft K3" <Elecraft_K3 at yahoogroups.com> 
Sent: Monday, August 10, 2009 12:35:58 PM GMT -08:00 US/Canada Pacific 
Subject: [Elecraft_K3] Filter Confusion 

  






As I read in the owners manual the Xtal filters are the roofing filters.. Also mentioned is the availability of a variable bandwidth filter due to the low IF Freq.. I guess that is from someone else other than Elecraft ??? 

I expected to see a button marked roofing filter and then select the predefined width ie. 3,6  or 16. Guess thats not the way it is.. I am confused over the roofing filter implementation. Is there a true roofing filter and is there a variable receive bandwidth adjustment for SSB or is everything governed by the 1st IF xtal filter I purchase ?? 

Sorry if I am not explaining myself well.  I plan to order later this week and want to make SURE what I am purchasing. I downloaded and read the assembly and owners manuals but probably missed info. One other item. It seems one needs a dummy load to finish xmit setup. Well I sold mine YEARS ago. Is there a way around my having to purchase one ? 

Thanks, Jim K3QYR 




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