Re:] Switch mode PSU I just read the comments and reply in the message below: I have both those PSU, the Sec 1223 is by far the oldest one. It has several" birdies" best described as rather Raucous Crows, which get worse as the frequency goes lower. 160m is pretty poor. I added several devices in attempts to quieten same, which was achieved to some degree. It is acceptable on all but 160m, where it appears in about 3 places across the band, (not always the same places) The Waters and Stanton Power Mite is cheaper device and does much the same although trips off when the full 20 amps is drawn quite often. It has similar noises on several bands, which I can live with but is about the same as the other on 160. I have not attempted to add filters due to the limited success of the other. There is little doubt the "proper" transformer PSU's I have are best but where weight is concerned the switch modes units are light and neat for the cost. - Ideal I guess for the VHF folk
73 David G3SCD / VK3DBD _____________________________________________________________________ Message-ID: <[email protected]> Iain, I use a Power Mite from Walters & Stanton when not in the shack - is very quiet, both physically and RF wise 73 de M0XDF, K3 #174, P3 #108, KX3 #??? -_______________________________________________________________ On 10 Sep 2011, at 22:58, Iain Haywood wrote: > Hi, > > Has anyone had any bad experiences using a K3 and a switch mode PSU?. > The SEC-1223 looks great aware some can cause problems.. > They say 'Totally noise free', that's some claim.. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
