On Fri, 9 Aug 2013, wrote:

On Friday, August 9, 2013 7:48:09 PM UTC-4, Oregonian Haruspex wrote:
On 2013-08-05 22:13:25 +0000, dave said:



On 08/05/2013 03:03 PM, DhiaDuit wrote:

On Monday, August 5, 2013 4:30:32 PM UTC-5, D. Peter Maus wrote:

On 8/5/13 11:45 , Hils wrote:



On 2013-08-05 16:15, D. Peter Maus wrote:



On 8/5/13 24:37 , wrote:

''Theater'', T'IS.



http://www.elecraft.com/elecraft_products_page.htm



http://www.electronickits.com/kit/complete/complete.htm



http://www.jameco.com/webapp/wcs/sto...jameco_page=54





etc. I bet there are way more kits today than there were during the

Eico Heath days. They just aren't for shortwave radios very much,

although the Elecraft radios are the best in the world and totally

suitable for serious SWL.



While the Elecraft radios can and do perform well on shortwave, the

widest crystal filter at 4.2 KHz (on the KX3) is still a bit narrow for

real hi-fi SWL. I say this as a very happy KX3 owner.



It gets the job done, but the Elecraft rigs are really meant for hams

and not SWLs.

Just looked at the KX3 schematic. It is a direct conversion receiver. Where is the crystal filter located ?

Is it one of those new wave radios that do most of the filtering
digitally? Perhaps the mentioned 4.2KHz filter is treated more like a
"roofing filter" to limit bandwidth, but real selectivity comes later. Or
maybe it's all done digitally, and there's no actual crystal filter, in
which case it would mean the radio needs new software for wider bandwidth.

Michael