[R-390] R-390A and GFI

[thoyer1 at verizon.net]

Attached are a couple pics from one of my 390A's. For this one I made a Delrin block and used screws as studs to feed the power in and then attached it to an off the shelf line filter. I fabricated a mount for the line filter as well.

On another unit I disassembled the line filter and gutted it. Connected the input to the output internally then sealed it back up and reinstalled.

Another I opened up and replaced the caps with AC line caps.

Experimenting with different approaches as you can tell.

Tom
W3TA

-----Original Message-----
From: r-390-bounces at mailman.qth.net <r-390-bounces at mailman.qth.net> On Behalf Of gary.biasini at shaw.ca
Sent: Monday, March 25, 2024 8:15 PM
To: Barry Scott <72volkswagon at gmail.com>; hamfish at comcast.net
Cc: R-390 at mailman.qth.net
Subject: Re: [R-390] R-390A and GFI

Barry,

Do you have any pictures?

Gary I. Biasini
________________________________
From: Barry Scott <r-390-bounces at mailman.qth.net> on behalf of Barry Scott <72volkswagon at gmail.com>
Sent: Monday, March 25, 2024 6:00:37 PM
To: hamfish at comcast.net <hamfish at comcast.net>
Cc: R-390 at mailman.qth.net <R-390 at mailman.qth.net>
Subject: Re: [R-390] R-390A and GFI

Years ago, I made some aluminum adapter plates that mounted on the existing threads where FL-101 was.  It had a properly-shaped hole that accepted a modern line filter with an IEC connector.  Clean, no-mod update.

Thanks,
Barry


On Mon, Mar 25, 2024 at 5:44 PM <hamfish at comcast.net> wrote:

> Good Afternoon Jim,
>
> Another thought comes to mind, do you need the original R390/A line 
> filter (FL101)? Most of today's interference is by way of the antenna input, RFI.
> Line noise is better dealt with by finding that source and unplug it. 
> FL101 is what trips GFIs because of leakage of the caps inside of said 
> line filter. So power the R390/A (with no antenna connected) through 
> an outlet that does not have a GFI, is there noise? If there is no 
> noise, at this time a FL101 or equivalent is not needed. Remove FL101 
> and be done with it. If there is noise, the search begins. Might be 
> easiest to unplug the source, maybe ferrite thingies, or a line filter 
> mentioned by the rest of the long distant R390/A service dept.
>
> If noise is by way of the antenna input....................welcome to 
> today's world.
>
> Regards,
> Craig
>
> -----Original Message-----
> From: r-390-bounces at mailman.qth.net <r-390-bounces at mailman.qth.net> On 
> Behalf Of Jim
> Sent: Monday, March 25, 2024 9:58 AM
> To: R-390 at mailman.qth.net
> Subject: [R-390] R-390A and GFI
>
> I'm in a new location and when I plugged in my R-390A it tripped the 
> GFI's in the room.
> I see that there is a modification to the 390 AC filter, but time is 
> short and I would like to get it on the air.
> Is there a simple way to keep the 390 tripping GFI's?
>
> TNX
> Jim
> WB2TPS
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