Another EBay absurdity - test-drb@ccmp.vtda.org

15 May 1998

The only problem I have with my rather conventional equipment in terms
of RFI is when my monitor changes modes, and I am using an AM
receiver right next to it. The sound flickers a bit. I would think
that the home computers and games systems like C64, PCjr, etc.
couldn't put out too much RFI, since they used TVs for monitors...

...

Maybe that's why the 5150 is more desirable :-). After all, you can 
always fix those given the techref - no custom chips, full schematics, 
etc. No problem...

> Now to add something new to the list... What are the best/worst for  RFI?
...

Well, my old Tandy model 1 radiates a bit.

I would think some of the old DEC backplanes with no metal screening at 
all (like the RK11-C and DX11, and even machines in the BA11-F, like  the 
...
 PDP11/45) would not be trivial to get through EMC
tests. I've never had 
problems running any of my machines with normal broadcast radio/TV in 
adjacent rooms, so it's not a big problem in that sense, but it may be  a 
...
 pain for amateur/SWL work.

Worst problem I know is that the harmonics of both the TV line scan and 
the VGA line scan are close enough to our standard time service (Rugby 
MSF on 60kHz) to totally swamp the RF stage of any such receiver. I 
generally have to put the aerial/RF stage in another room at least.

-tony

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