Don, I would believe that hash is coming from devices used around the house (or your neighbor's). Ethernet modems and routers, computers, switching power supplies, wall-wart power supplies, touch lamps, lamp dimmers.
Anything that uses switching technology can produce such hash over a small frequency range and the range may shift with its load. You can verify that by killing all the power im your house and running the K2 on a 12 volt battery for the test. I hear hash of that nature on the simple antenna that I use at the workbench, but do not hear it when I use the 'proper' antennas in the shack - these antennas are located about 100 feet from the house so they do not pick up the noise sources. It also helps that I have a stucco house where the stucco wire mesh acts as a shield to keep the noise inside - but I don't dare consider inside antennas either, they too would be shielded. 73, Don W3FPR > -----Original Message----- > > > > New to the list, as I just completed #5885. With the exception of a > > couple of wrong turns, the build went great. My radio was completed > > about 1 week ago, and I recently noticed that I have some "hash", > > or "artifacts" on receive on specific frequency's. I.E., I don't > > have hash across an entire band, only on particular frequencies. > > Otherwise, the radio seems to be operating as expected. > > > > Eg. on 20 meters, the hash starts at about 14190, gets loudest at > > about 14200, and goes away at about 14212. I have other similar > > problems on other bands, but 20 seems to have the loudest > > occurrence of the problem, over the widest frequency span. > > (Although other bands have some noise, it doesn't span 20KHZ like > > it does in the aforementioned 20 meter example). > > > > Any help with where I might start looking for the source of this > > problem would be greatly appreciated! > > > > Thanks es 73 de Don > > W0DJC > > K2 #5885 > -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.432 / Virus Database: 268.15.27/602 - Release Date: 12/25/2006 10:19 AM _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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
