Fwd: [Elecraft_K3] Filter Confusion

[westalto]

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" <[hidden email]>
To: "Elecraft K3" <[hidden email]>
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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[Geoffrey Mackenzie-Kennedy]

Jim,

If you have a *long* length of old 50 ohm coax hiding somewhere, it might be
useful as a dummy load at some frequencies if its loss is high enough, but
make sure that its centre conductor and braid are not shorted.

IMHO a good dummy load is worth buying or building.

73,
Geoff
GM4ESD


> From: "Jim Rossell" <[hidden email]>
> Sent: Monday, August 10, 2009 12:35:58 PM GMT -08:00 US/Canada Pacific

>. 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 ?




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[Merv Schweigert]

Take a look at Ridge Equipment,  either on the web or ebay,  I bought a
really nice air dummy load from them, tested and certified, for 15 or 20
bucks,  100 watt.  Its small and works perfect for the K3 testing and
calibration,  sure worth 20 bucks to have a dummy with no oil or mess.
And its good into microwave freqs.
73 Merv KH7C

> Jim,
>
> If you have a *long* length of old 50 ohm coax hiding somewhere, it might be
> useful as a dummy load at some frequencies if its loss is high enough, but
> make sure that its centre conductor and braid are not shorted.
>
> IMHO a good dummy load is worth buying or building.
>
> 73,
> Geoff
> GM4ESD
>
>
>  
>> From: "Jim Rossell" <[hidden email]>
>> Sent: Monday, August 10, 2009 12:35:58 PM GMT -08:00 US/Canada Pacific
>>    
>
>  
>> . 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 ?
>>    
>
>
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
>  

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