[Elecraft] Benefits of Buying a Factory Assembled KX3

[Fred Smith]

All I can say about the filters in my KX3 is that they work and very well I
might add. This little radio never ceases to amaze me every day that I own
it.


73,
Fred/N0AZZ
K3 Ser #'s 6730/5299--KX3 # 2573--K2/100--KAT100
P3/SVGA--KPA500--KAT500--W2



-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Ron D'Eau Claire
Sent: Saturday, April 13, 2013 8:54 PM
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] Benefits of Buying a Factory Assembled KX3

Like many terms in Ham rigs today, "roofing filters" have taken on a whole
new identity that, in this case, has very little to do with their original
function. But there's a tenuous connection, just the same. 

As you probably know, "roofing filter" referred to a filter in the VHF
(typically 60 to 100 MHz) range for an H.F. rig that allowed a very high
I.F. to avoid image issues in an "all H.F. band" rig.

In the Elecraft rigs, people applied it to the 8 MHz I.F. filter. As bizarre
as that sounds, it was apparently in an attempt to show that the xtal filter
set the bandpass ahead of the 15 kHz DSP filters. 

Similarly, in the KX3 the name "roofing filter" is used to indicate the
filter in the audio range that comes ahead of the audio DSP filters. 

73 Ron AC7AC

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Fred Jensen
Sent: Saturday, April 13, 2013 4:53 PM
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] Benefits of Buying a Factory Assembled KX3

On 4/13/2013 4:49 PM, Walter Underwood wrote:

> I got a kit, partly because I did not get the roofing filters.
> Without those, a kit KX3 is fully aligned at the factory.

How do roofing filters work on a direct conversion radio?  That's not a
snarky question, I don't know and would like to.

73,

Fred K6DGW
- Northern California Contest Club
- CU in the 2013 Cal QSO Party 5-6 Oct 2013
- www.cqp.org

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft at mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft at mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html


-----
No virus found in this message.
Checked by AVG - www.avg.com
Version: 2013.0.2904 / Virus Database: 3162/6241 - Release Date: 04/12/13

-----
No virus found in this message.
Checked by AVG - www.avg.com
Version: 2013.0.2904 / Virus Database: 3162/6241 - Release Date: 04/12/13