Re: Transmit Phase Noise

southdaleus
 

Rob,

How about the K3 with the old bipolar transistors?  Is there much difference or none at all?

Dale, K9VUJ



On 12, Jan 2019, at 12:06, Rob Sherwood <rob@...> wrote:

Here is some data I have at both 100 watts and 30 or 35 watts for six rigs.
Different lab, different measuring equipment, different rig samples, so don’t expect absolute correlation with ARRL data.
ARRL lab data only measures phase noise, not composite noise (phase and AM noise).
Data from Contest University presentations of mine.
Note: While the listing are sorted by column 1, the ranking varies with frequency offset.
Rob
NC0B
 
Transmit Composite Noise Rig Comparisons 20 meters
Best at maximum power output, but degrades at lower power levels
 
Rig @ 100 watts                10 kHz offset, dBc/Hz     20 kHz offset, dBc/Hz     100 kHz offset, dBc/Hz
K3S                                         -141                                       n/a                                         -143
IC-7300                                 -130                                       n/a                                         -132
IC-7851                                 -129                                       n/a                                         -138
IC-7610                                 -127                                       -129                                       n/a
TS-890S                                -120                                       -129                                       n/a
FTdx-3000                           -120                                       n/a                                         -121
 
Rig @ 30 watts                   10 kHz offset, dBc/Hz     20 kHz offset, dBc/Hz     100 kHz offset, dBc/Hz
K3S                                         -132                                       n/a                                         -140
IC-7851                                 -123                                       n/a                                         -133
IC-7610                                 -122*                                     -124*                                     n/a
FTdx-3000                           -117                                       n/a                                         -117
TS-890S                                -113*                                     -122*                                     n/a
IC-7300                                 -112                                       n/a                                         -120
 
* = Power level was 35 watts
n/a = data not available
Rev D
 

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