28-12-2018, 05:39 AM
Bo
No such luck: My spec analyser is currently in the to-be-fixed queue (has been for a while) and I might not see any close-in spurious on it anyway..
I will say that when I spin the dial on the Icom IC-7400 HF transceiver that I haven't noticed any strong spurs, given that the S-meter is showing full scale - S9+60 at the on-frequency signal. I might have to look again and look closer.
The unit will be powered off when I am actually operating on HF or VHF but otherwise should be on 24/7.
73 Doug
Edit:
Ref : Spurious
10139 @ S9+60 : 10091.2 @ S7, 10186.9 @ S8
14097 @ S9+60 : 14000.7 @ S4, 14048.7 @ S7, 14144.2 @ S8, 14191.9 @S6
18106 @ S9+60 : 17962.2 @ S4, 18087.5 @ S4, 18153.4 @ S5, 18200.7 @ S4
50293 @ S9+60 : 50150.6 @ S6, 50198.2 @ S7, 50245.9 @ S9, 50341.4 @ S9, 50389.1 @ S7, 50436.9 @ S6
The results are not really accurate as broadband noise effects mask the true minimum signal levels ( particularly on 50MHz ) - which are probably lower rather than higher.
The calibration of the S-meters is always in doubt but is indicative of the main signal level versus spurious.
No such luck: My spec analyser is currently in the to-be-fixed queue (has been for a while) and I might not see any close-in spurious on it anyway..
I will say that when I spin the dial on the Icom IC-7400 HF transceiver that I haven't noticed any strong spurs, given that the S-meter is showing full scale - S9+60 at the on-frequency signal. I might have to look again and look closer.
The unit will be powered off when I am actually operating on HF or VHF but otherwise should be on 24/7.
73 Doug
Edit:
Ref : Spurious
10139 @ S9+60 : 10091.2 @ S7, 10186.9 @ S8
14097 @ S9+60 : 14000.7 @ S4, 14048.7 @ S7, 14144.2 @ S8, 14191.9 @S6
18106 @ S9+60 : 17962.2 @ S4, 18087.5 @ S4, 18153.4 @ S5, 18200.7 @ S4
50293 @ S9+60 : 50150.6 @ S6, 50198.2 @ S7, 50245.9 @ S9, 50341.4 @ S9, 50389.1 @ S7, 50436.9 @ S6
The results are not really accurate as broadband noise effects mask the true minimum signal levels ( particularly on 50MHz ) - which are probably lower rather than higher.
The calibration of the S-meters is always in doubt but is indicative of the main signal level versus spurious.
Doug VK4ADC @ QG62LG51
http://www.vk4adc.com
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http://www.vk4adc.com
This Forum is only going to be as interesting as the posts it contains.
If you have a comment or question, post it as it may trigger or answer the query in someone else's mind.