[Hallicrafters] computer noise

[Roger K8RI]

Thanks Joe, I'll have to remember that hard filtering just-in-case.  My 
biggest problem has been the mike cable picking up the AC in the room. The 
only way I could get rid of it was to ground the ... well... ground which 
really isn't a shield type ground and is used for several mike controlled 
functions.  I may have had to give up some functions on the 756 Pro, but at 
least it works.

"So far" even with this large 64 bit computer I've had no noise problems and 
had to take no action to prevent it.  Right now the two in here have the 
sides off as I've been doing some work on them.

Now I need to find a 32 Bit, 3.2 Gig XP+ for a MB that needs repairing out 
in the shop.  If I can't find a 3.2, 32 Bit then its a complete new 64 bit 
system and the only thing I'd be able to keep would be the empty case and 
the hard drives.

I'd like to get the rigs set up to work with the USB ports while they are 
currently set for the serial port and I only have one serial port. OTOH 
there are converters available to go from serial to USB.

Roger Halstead (K8RI and ARRL 40 year Life Member)
N833R - World's oldest Debonair CD-2
www.rogerhalstead.com


Lots of comments on fluorescent replacement bulb generated hash.  I recently 
purchased several 4 packs and 6 packs from Home Depot, installed them 
thoughout the house (including the radio shack) and have not experienced any 
hash from them.

There were also side comments on computer/monitor generated noise.  When I 
purchased my latest 64 bit processor super computer, it put signals all over 
the bands.  I made a simple "sniffer" coil pick up and plugged it into my 
756pro antenna socket and went sniffing.  I determined what every was 
generating the noise in the computer (most likely the switching power 
supply) it was being conducted through the computers power cord.  Various 
clamp on power cord ferrites didn't seem to suppression the noise at all.  I 
found a build project in my 1980 ARRL Handbook (that's right, 1980) for a 
brute force filter.  I built one in a Radio Shack plastic project box and 
wired it in series with the computers power cord.  All the computer 
generated noise is now completely gone.  Glad I didn't trash that old 
handbook, maybe I should buy a new one?
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