On Thu,10/29/2015 2:13 PM, Fred Jensen wrote:
The intermittent problem turned out to be paint under a lug with a loose screw.
That seems to be a very common problem with Astrons -- the power system "green wire" (safety ground) is soldered to the mounting lug of a terminal strip, which is insulated from the chassis by paint. This is a MAJOR violation of NEC. To make matters worse, the V- terminal is soldered to the same lug. The combination makes the unit susceptible to RFI.
In one of my Astrons, the two sections of the chassis are insulated from each other by paint, so the unit is essentially unshielded as well.
I do NOT recommend bonding V- to the chassis, so when you're fixing the paint problems, cut that jumper. There's no good reason for it.
73, Jim K9YC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
