01-06-2018, 07:30 AM
Jayson
The Yaesu rotator controllers I have seen have been purely analogue inside so unlikely to be a source of QRM, but you also mentioned a "Fox Delta ST3 computer interface" which will contain at least a microprocessor and it is likely to be the actual source of your problems.
Serial comms connections to any computer also typically contribute some noise in the receiver, USB connections are even worse - and it doesn't matter what device the USB lead is connected to. Many USB leads have minimal shielding so radiate as soon as they are active.
It might pay to just try the rotator stand-alone, and then with the ST3 connected, and try to define where/which device is actually generating the noise. Adding some shielding or ferrites just to the offending device may solve the noise completely. (just remember that aluminium foil from the kitchen makes a great, flexible, temporary shielding material)
Worth a few minutes experimentation 'cos that's what we do - experiment.
Doug
The Yaesu rotator controllers I have seen have been purely analogue inside so unlikely to be a source of QRM, but you also mentioned a "Fox Delta ST3 computer interface" which will contain at least a microprocessor and it is likely to be the actual source of your problems.
Serial comms connections to any computer also typically contribute some noise in the receiver, USB connections are even worse - and it doesn't matter what device the USB lead is connected to. Many USB leads have minimal shielding so radiate as soon as they are active.
It might pay to just try the rotator stand-alone, and then with the ST3 connected, and try to define where/which device is actually generating the noise. Adding some shielding or ferrites just to the offending device may solve the noise completely. (just remember that aluminium foil from the kitchen makes a great, flexible, temporary shielding material)
Worth a few minutes experimentation 'cos that's what we do - experiment.
Doug
Doug VK4ADC @ QG62LG51
http://www.vk4adc.com
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If you have a comment or question, post it as it may trigger or answer the query in someone else's mind.
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.