[Elecraft] K3 or SDR-5000?

[Bill W4ZV]

W5WVO:

>One thing that must be pointed out, however: When W4ZV posted in early 
October, the FLEX-5000A was quoted as having an IMD3 at 2 kHz of 96 dB. 
According to the current FLEX website, they are now claiming a 14 MHz IMD3
at 
2 kHz spacing of >100 dB using ARRL measurement methods. This puts it 6 dB
(or 
more) better than the K3 at 2 kHz spacing, assuming identical measurement 
methods. I think it's arguable whether even a 6 dB difference in IMD3 is 
meaningful when both are well above 90 dB, but there it is. Comments on this 
thought would be interesting.

The FLEX website has always claimed >100 dB...but so does Ten-Tec for Orion
(101 dB) which has been measured by many independent testers in the 92-93 dB
range.  There are often differences in measurement equipment, methodologies,
personnel, etc that cause such differences.  This is why I pay little
attention to manufacturers' claims and specs and wait for independent tests
by ARRL, RSGB, Sherwood, W8JI, etc.

Regarding 6 dB IMD...I would say that difference would be marginally
noticeable.  2-3 dB is not significant and well within measurement error and
sample variation.  >10 dB is significant, which is the margin between rigs
like the K3, Orion, Flex and the better up-conversion rigs (IC-7800, Omni
VII, etc).

I'll again state that I feel it is very disingenuous for Flex to tout their
2 tone IMD claim so boldly but not even mention BDR performance.  It reminds
me too much of Detroit automobile advertising...  (Our Pinto has the same
trunk space as a BMW 530).

"The FLEX-5000™ is the Highest Performing HF + 6m Amateur Radio Transceiver
Available at Any Price with a 3rd Order Dynamic Range Using a 2 KHz Spacing
at 14 MHz Greater Than 100 dB*"

* - Using ARRL Lab testing methods

http://www.flex-radio.com/



Ten-Tec makes a similar since they measure 101 dB.  (Also using ARRL
methodology)

"ORION II is NUMBER 1"

IMD3 dynamic range: 101 dB typical, pre-amp off, 20-kHz and 5-kHz spacing.


The SDR-5000, Orion and K3 are all excellent products but I wish
manufacturers would give us credit for a little more intelligence than their
marketing departments and advertising agencies seem to have.

73,  Bill  W4ZV




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