[R-390] Mounting Replacement EMI Filter

[Barry]

A few years ago, I designed some adapter plates that would accept a filter like the ones shown in the link below.  The plate accepted the face of the filter and had holes that matched the original filter's mounting holes.  The Corcom mounted to the plate and the plate then mounted to the inside of the rear plate on the R390A.  I used one and sold most of the rest to the list members (I hope they worked out for those who bought them).

http://www.cor.com/Series/IEC/EC/

This allowed the filter to be used with no modification to the rear panel on the R390A.  I think I had to trim just a very small amount of plastic away from the IEC cable to allow it to seat firmly and deeply in the Corcom but it was a negligible amount of material.

With a right-angle IEC cable, it made for a very neat connection that allowed the radio to be placed more flushly against the wall.

While I did this by designing the plate and having a local shop with a plasma cutter do most of the work, if you have access to a small milling machine, the plate would be easy to make.

Good luck with it.

Barry - N4BUQ


 On Tue 28/02/12 11:03 AM , "Charles Gessner" w3on at verizon.net sent:
> GM All
> 
> I have a question. What is the best way to mount one of those replacement
> EMI filters for the R-390a?I purchased a Corcom 6EHQ3 emi filter some time ago, as some has suggested
> in the past,  to replace the aging R-390a emi filter. The newCorcom unit is fairly large, as compared to the original emi filter, and
> does not easily fit in the cabinet. I probably could mount iton the outside rear panel, I really don't want to do that as I would like
> to keep the R390a as stock as possible.
> Some time ago, I think about a year ago someone announced that they had
> worked up some sort of mounting kit to mount these typefilters. Alas, no other details have emerged that I am aware of.
> 
> I have also been trying to figure out how to get the ac power to the new
> Corcom filter. I would prefet not to drill holes in the rearchassis. I have looked and looked for an a/c receptacle that will fit the
> one inch diamater hole at the rear of the R-390a.So far, I have not found any. Some have suggested using an desktop computer
> power supply a/c connector. I actually triedone of them, and found that they did not fit the one inch hole at the rear
> of the R-390a. Some have even suggested gettinga computer a/c connector with the emi filter. Again, same problem. How to
> mount it without cutting up the cabinet.
> I have read and re-read all of the emails about the emi filter. Both the
> pro and con about changing them or not changing them.I want to change mine.
> 
> I would appreciate any feed back about this project. I know that many of
> you folks reading the R-390a reflector have been throughthis at one time or another. I also realize that some do not want to touch
> this project with a ten foot pole. I also know that manyof you have overcome this. I would, as I am sure others would, like to know
> how you accomplished this feat.
> 73 de Chuck W3ON