Re: How to get rid of Local FM broadcast stations #ubitx

MVS Sarma
 

Use a 2wire + shield cable between audio 8 pin plug and the volume control. The ground pin of VC can return  back on the shield wire to the connector. But not to be grounded there at VC.
Hope this method helps.

Sarma vu3zmv

On Sat, 7 Dec 2019, 9:24 pm Gavin, <gdesplin@...> wrote:

I have my radio in the chassis now, no more humming, but the radio stations are back. I can’t see any wires touching the chassis and the stations were there without the lid. And they are persistent no matter my tuning. Here are some pictures:

On Mon, Dec 2, 2019 at 08:03 PM, Adrian Chadd wrote:

hi,

post a photo of the wiring. you may need to shorten some wires and do
some RF bypassing?



-adrian

On Mon, 2 Dec 2019 at 19:33, <gdesplin@...> wrote:

I tried taking it of the metal chassis and now the broadcast stations were quiet compared to a loud hum. The hum got more intense if I put my fingers close it the volume control wires. Also if things got moved around a bit it the broadcast stations would get loud and then stop when things moved back around again.

On Mon, Dec 2, 2019 at 06:10 PM, Ashhar Farhan wrote:

If the stations are heard regardless of your tuning, it is probable that they are being picked up by the audio system. Can you double check that the volume control and the speaker wires don't touch the chassis anywhere?

- f

On Tue 3 Dec, 2019, 1:36 AM , <gdesplin@...> wrote:

Ok, so are you talking about getting this http://qrpme.com/?p=product&id=BCI like suggested at http://ubitx.net/fix-bci-filter/ or another one of their suggestions? Or maybe something like in this youtube video https://www.youtube.com/watch?v=fgQenFJOjr4 ? Or did you have something else in mind? I'm all for whichever is simplest/easiest as I am a beginner.

On Mon, Dec 2, 2019 at 10:20 AM, Adrian Chadd wrote:

well, yeah. If you have AM stations close by then they can definitely
overwhelm your frontend.

Get one of the bitx AM broadcast filters; they're high-pass filters
that drop-off around 3MHz. So yeah, you won't be receiving 160m, but
that's ok right?


-adrian

On Mon, 2 Dec 2019 at 09:17, <gdesplin@...> wrote:


Ah, it looks like both these stations also have AM counterparts, at 1490 kHz and 1210 kHz. Does that change things?

Join BITX20@groups.io to automatically receive all group messages.