[Elecraft] Son of K3??

[Geoffrey Mackenzie-Kennedy]

If the TS-590 uses only two roofing filters and has "the best receiver specs 
out there", then I speculate that it could be using an H-Mode mixer, that 
the roofers exhibit better than average in-passband and skirt IIP3 followed 
by a decent "strong" IF, plus a LO whose phase noise is suitably low 
e.g. -145 dbc/Hz at 1 kHz offset.

If they have gone down this route and if they have paid attention to 
important details such as core sizes and mix, then with the 500 Hz roofer in 
line we might be seeing spurious free IMDDR3 figures of 120db at spacings of 
1kHz, and a HF noise figure of 9-10db without a preamp, based on actual 
measurements made on a living "H-Mode" receiver.

73,
Geoff
GM4ESD



From: "William Ravenel" <wmrav at triad.rr.com>
Sent: Sunday, May 16, 2010 1:24 AM

>I talked to a Kenwood rep at Dayton this morning. He said the TS-590 would 
>have the best receiver specs out there. I asked if it would beat the K3 and 
>he said the TS-590 would have the best receiver specs out there. The radio 
>has an IF of 11MHz and two stock roofing filters - 2.8KHz and 500Hz - no 
>spare slots and no options.