Carrier spectrum at full power from a TS-700.
The serial number is 161193.
The same as above, but frequency shifted by 100 kHz and
with 10dB more signal into the RX144.
This particular unit was modified at the Annaboda meeting
in 1980. The modifications were described in
VHF communications in English
UKW berichte in German
Radio och Television in Swedish.
The unit measured above is the unit labelled "B" in the old
articles.
Offset 5kHz 10kHz 15kHz 20kHz 50kHz 100kHz 150kHz
2005 (dBc/Hz) 116.0 127.2 132.6 133.7 138.4 141.4 140.8
1980 (dB) - 97 100 102 105 106 107
Difference - 30.2 32.6 31.7 33.4 35.4 33.8
The old values were given in dB for SSB bandwidth (3kHz)
as stated in the Introduction:
English / /
German
and consequently the difference should have been 35 dB
except at 10kHz where the wider filter used in 1981
affects the result.
This unit has been modified several times over the years
and the final transistors are no longer the original ones.
It seems that the sideband noise has not changed much.
Zoomed in carrier spectrum at full power from a TS-700.
The serial number is 161193.