tag:blogger.com,1999:blog-4901205574058136834.post411353466564788791..comments2024-03-26T20:17:30.126-07:00Comments on Every Blade of Grass: WHOO-HOO! Back On-The-Air!drjimhttp://www.blogger.com/profile/05647484115197408897noreply@blogger.comBlogger2125tag:blogger.com,1999:blog-4901205574058136834.post-17192552922436692702009-12-09T09:05:44.018-08:002009-12-09T09:05:44.018-08:00Hi, Mikey
What you're hearing is the fundament...Hi, Mikey<br />What you're hearing is the fundamental, and the harmonics, of the switching frequency. Mine did something else, broadband hash everywhere. It made most of HF useless. I have two SS-30 supplies, and the noisy one is the older of the two. I haven't tried the newer one, so I don't know if it's any better. I primarily use these supplies for Field Day, where I operate the satellite station for my radio club, so I never noticed the noise before. Makes me wonder if I was bothering the HF stations! <br />You'll have to find out if your noise is conducted (down the power cord and DC output leads) or radiated. If it's conducted, you can try adding some ferrite blocks on the power cord and output leads, placing them as close as possible to the case of the supply. If it's being radiated, make sure the case fits together tightly, and the paint is scraped/sanded from the metal parts where they fit together so you have good electrical contact between the case halves, and make sure the case of the supply is grounded to your station ground.<br />Industrial Communications Engineers ("ICE") makes an excellent 'Brute Force' powerline filter that will stop the noise if it's coming down the power cord. See http://www.iceradioproducts.com/filtersrf2.html#4 for more info. Ferrite blocks and cores are available from a large number of suppliers. There's a lot of info on Astron supplies at the Repeater Builder website, http://www.repeater-builder.com/astron/astron-index.html<br />As far as "fixing" mine, I swapped it out for a big Astron linear supply, and the noise went away. When I have some time, I'll try the newer SS-30, and if it's better, I'll open the two up and see what's different between them.<br />73, Jimdrjimhttps://www.blogger.com/profile/05647484115197408897noreply@blogger.comtag:blogger.com,1999:blog-4901205574058136834.post-46013334801468108242009-12-09T08:17:14.756-08:002009-12-09T08:17:14.756-08:00I own a SS-30M and have a harmonic problem with it...I own a SS-30M and have a harmonic problem with it. With the SS-30M hooked up to any radio, I hear a harmonic about every 40KHz, up thru 21MHz. Is this the same as you "hash"? If so, how did you fix it?<br /><br />73's....Mikey, WB8ICN<br />wb8icn@comcast.netAnonymousnoreply@blogger.com