Well I didn't plug it into my K3 with the transformer isolation because my K3 is in its gestation period and I am waiting for delivery. But, I don't think that it would have avoided the problem. I was using transformer isolation with a Rascal Interface. The hum came through the push to talk ground circuit. One of my friends had to replace the transistor PTT interface with an Opto Isolator to eliminate his ground loop problem. I have a separate power feed for my radio equipment that comes from a box at my meter loop and quite different ground length from the house wiring. You need your computer fed from the same power source as the radio equipment even if you have a K3.
--- Brett Howard <[EMAIL PROTECTED]> wrote: > This is why we transformer isolate our audio. > If/when you get a K3 > you'll have this feature built right into the rig. > For me I just built > a cable for the PSK/RTTY and what not and put > transformers in a box in > the middle of the cable. > > > On Sun, 2008-03-16 at 05:57 -0700, WILLIS COOKE > wrote: > > > I don't know if it applies to your situation or > not > > Raymond, but I had a lot of hum on when I > connected my > > 110V Lap top to my TS-850 for PSK-31. I had the > > charger plugged into a house circuit and my radio > > equipment plugged into a separate circuit for the > > radio station. When I moved the charger plug to > the > > radio circuit the hum went away. > > > > --- Raymond METZGER <[EMAIL PROTECTED]> > wrote: > > > > > Hi Elecrafters, > > > > > > > > > > > > I am interested to know what solution can be > used to > > > avoid the noise > > > generated by the 220 V AC (OEM) UPS of my recent > > > Dell Latitude Laptop. > > > > > > For the time being, I can only use the laptop > with > > > my K2/100 if the laptop > > > is powered by its internal battery. > > > > > > > > > > > > Raymond METZGER > > > > > > F4FNT > > > > > > K2 5,636 - K3 expected at month end (ordered 8 > > > September, "Katiegram" > > > received last Friday) > > > > > > _______________________________________________ > > > Elecraft mailing list > > > Post to: [email protected] > > > You must be a subscriber to post to the list. > > > Subscriber Info (Addr. Change, sub, unsub etc.): > > > > http://mailman.qth.net/mailman/listinfo/elecraft > > > > > > > > > Help: http://mailman.qth.net/subscribers.htm > > > Elecraft web page: http://www.elecraft.com > > > > > > > > > Willis 'Cookie' Cooke > > K5EWJ > > _______________________________________________ > > Elecraft mailing list > > Post to: [email protected] > > You must be a subscriber to post to the list. > > Subscriber Info (Addr. Change, sub, unsub etc.): > > http://mailman.qth.net/mailman/listinfo/elecraft > > > > > Help: http://mailman.qth.net/subscribers.htm > > Elecraft web page: http://www.elecraft.com > Willis 'Cookie' Cooke K5EWJ _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
