[K3PZN-List] Additional transceiver tx spectrum data

[Peter Morton]

Following the meeting last night where co-location of radios at Field 
Day was discussed, I researched additional QST product reviews and added 
more transceivers to the list emailed previously.

The data below lists three parameters:  Keying sideband 4 KHz from the 
carrier, important for determining how "clicky" a radio transmitter is 
when receiveing at nearby frequencies; composite noise at 20 KHz offset 
from the carrier; and composite noise 100 KHz from the carrier. 
Composite noise is the hash heard in a receiver when a transmitter is 
operating key-down, and can be particularly strong when both are 
operating on the same band. Normally CW and SSB operation on the same 
band are separated by 100 KHz.

We use bandpass filters to reduce composite noise and harmonics when 
operating on different bands but these filters are ineffective when 
operating on the same band.

I sorted the list on the 20 KHz offset composite noise for comparison.  
Older QST reviews do not include the keying sideband and 100 KHz offset 
composite noise data.

The Yaesu FT-1000 seems to be the norm transceiver used by contesters 
and has worked well at collocated sites.  So, use the FT-1000 data for 
comparison.

The more negative a data number is, the better the performance. (Some of 
the newer rigs allow control of the keying rise and fall times which 
will affect the keying sideband data.)



                  keying   composite  composite
                 sideband  noise at   noise at
                 at 4 KHz   20 KHz    100 KHz
                  offset    offset     offset
Radio             (dBc)   (dBc/Hz)   (dBc/Hz)
---------------  -------  ---------  ---------
K3/100             -90       -147       -155
TS-950SDX MF/H      NA       -143        NA
TS-590S            -88       -135       -138
IC-7700            -83       -135       -137
TS-990S            -87       -133       -140
FT-1000MP           NA       -133        NA
OMNI VI Plus MF/HF  NA       -133        NA
FT-DX5000D         -81       -130       -130
FT-DX9000MP        -80       -128       -128
FT-857              NA       -128        NA
FT-897              NA       -128        NA
FT-950             -83       -125       -125
IC-7200            -88       -121       -121
FT--DX3000         -81       -119       -119
FT-450D            -70       -112       -121
Omni-VII HF/6      -84       -105       -127