[Amps] SB200 and Genie garage door opener

[Jim Brown]

On Wed, 4 Feb 2009 12:32:23 -0800 (PST), Dave Haupt wrote:

>I put a serious AC line filter on the garage door opener,

Great information, Dave. If this is what's happening to Frank, the 
SB-200 may be causing other problems via the power line that 
haven't yet been discovered. In that case, it would be good to put 
a power line filter on the SB-200. There's an old-fashioned 
electronics surplus warehouse in Silicon Valley called HSC (also 
known as Halted Specialties) that has a broad section of line 
filters from good companies like Corcom and Delta, nearly all of 
them rated for 250VAC. A month or two ago, I found several that 
are big enough to use on my Titan power amps and another that is 
big enough to put on the 6kVA generator that runs my well motors!  
I think I paid about $15 for the Titan-size filters, and maybe $25 
for the 40A filter. HSC has a web presence. Google to find them.

Another point though. Often, RFI problems that are blamed on the 
power line are really the result of improper grounding. All 
grounds in a home -- ground rods, antennas, towers, ham shack, 
telephone, CATV, and power system bond -- must be bonded together 
outside the home at a single point. This is critical for lightning 
protection, but it's ALSO critical to minimize RFI and hum/buzz 
problems. If one or more of those bonds is missing, that could 
easily cause problems with RFI, hum, and buzz. 

73,

Jim Brown K9YC