Warning: Creating default object from empty value in /homepages/11/d132647312/htdocs/Amfone/mkportal/include/SMF/smf_out.php on line 47
R-390a tripping ground fault GFI




 
The AM Forum
October 20, 2018, 09:45:24 AM *
Welcome, Guest. Please login or register.

Login with username, password and session length
 
   Home   Help Calendar Links Staff List Gallery Login Register  
Pages: [1]   Go Down
  Print  
Author Topic: R-390a tripping ground fault GFI  (Read 656 times)
0 Members and 1 Guest are viewing this topic.
KM4RHK
Member

Offline Offline

Posts: 1


« on: December 27, 2017, 08:11:15 PM »

A simple effective and safe solution.
https://youtu.be/W0DiPqjzRbI
Logged
K4RT
Contributing
Member
*
Offline Offline

Posts: 442



« Reply #1 on: December 30, 2017, 09:57:50 AM »

Interesting video.  It seems to me that replacing the offending AC bypass capacitor(s) would be simpler, cheaper, and just as safe, but I'm not familiar with the R-390A.

My Hammarlund receiver started making a GFCI outlet buzz but not open, and that was without closing the receiver's power switch, just plugging the line cord into the outlet. The schematic shows that the bypass caps are on the AC side of the power switch so that was the first thing I checked.  One of the original caps turned out to be leaky.  I replaced it, which eliminated the problem.
Logged

Brad K4RT
WD8KDG
Member

Offline Offline

Posts: 234



« Reply #2 on: December 30, 2017, 12:05:36 PM »

FL101 is a sealed metal can. I used a Dremel tool to cut one open an take a peek. Yes the caps can be replaced. Its (FL101) purpose is to lessen/eliminate noise coming from/thru the power cord.

So if there is noise, from "where" is the first question. If the GFCI is tripping and the noise is Part 15 Chinese RFI, a person could just remove FL101 and solve the GFCI issue. A new modern line filter may not do much, if anything for Chinese RFI.

Some of my R390/A receivers have FL101 removed (no modern line filter), others still have FL101 in place and not tripping a GFCI. When living in Springfield, OR the carrier meter was never below 20DB, lots of Chinese noise makers. A new modern line filter wasn't the cure. Now living in La Pine, OR; the carrier meter needle rests very close to 0 (zero) on all the R390/A's. Go figure!

Regards,
Craig
Logged

Ham radio is now like the surprise in a box of "Cracker-Jacks". There is a new source of RFI every day.
KD6VXI
Contributing
Member
*
Offline Offline

Posts: 1877


Making AM GREAT Again!


« Reply #3 on: December 30, 2017, 09:45:19 PM »

Since most of the chicom interference is radiated, not just limited to the transmission line mode, it comes in via the antenna lead in as well.

A simple ferrite choke at the feed point and at the tuner or swr/wattmeter has knocked down //several// s units of noise in the past.

Since most noise is brought in via common mode, you could ditch the line filter, and add a couple beads of ferrite, stacked (different mixes) and a few turns of line cord passed through would give as much, and in some cases a lot more, rejection of the noise.

Jim Browns rfi and choke cookbook would be a good reference here.

--Shane
KD6VXI
Logged
Pages: [1]   Go Up
  Print  
 
Jump to:  

AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
 AMfone 2001-2015
Powered by SMF 1.1.21 | SMF © 2015, Simple Machines
Page created in 0.046 seconds with 18 queries.