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View Full Version : ground noise on base radio ugh!!!!!



scannerkid70359
01-13-2021, 09:21 PM
sooo been dealing with this for quite awhile now how can i get rid of it

JesseJamesDallas
01-17-2021, 07:15 PM
depends on the noise...if it's coming from florescent lights in the area, or grow lights, transformers, or something else electrical running, then there's not much of anything you can do about it.

Grey squirrel
11-03-2021, 07:11 AM
Ferrite chokes.

JesseJamesDallas
11-03-2021, 08:34 PM
One other thing...If you have a plasma TV on...."turn it off!":300 (97):

GobblerK5
11-16-2021, 12:13 PM
Had a bad breaker in panel box that was causing noise on base radio...might check your breakers.

Also, LED lights that you've installed in the house to save electricity...

Sent from my motorola one 5G UW ace using Tapatalk

Alabama Buckeye
03-30-2022, 07:22 PM
Palomar-Enginners recommend 43 material chokes 25-300MHz and 31 for 10MHz and lower.

Archy
03-30-2022, 07:40 PM
Yes. I use five 63mm toroids from Fair-Rite glued together, then pass the RG213 through four times creating three loops. This has a high choking impedance at 27mhz. I also use this at the balanced feedpoint of my LFA and Moxon antenna as opposed to a 1:1 current balun.

Archy
03-30-2022, 07:54 PM
Correction on my last post, 31 material is still effective on 27mhz, it performs fine according to specs regardless of Palomar. I don't know where their specs come from or who makes their ferrites. 43 mix has that little bit more choking impedance on and and above 27mhz. It's much of a muchness as far as I am concerned.

Alabama Buckeye
03-30-2022, 10:17 PM
Not for sake of argument: RG-400 choke kit mix 31 toroid, 2.4 OD toroid (160-20m);RG-400 choke kit mix 43 toroid, 2.4 OD toroid (40-6m) IAW https://www.kf7p.com/KF7P/RF_chokes.html. My interest is in building toroid chokes.

I've made a handful of Air Choke Baluns using 4" PVC and 18' coiled coax. Too heavy for antenna fed choke.

Archy
03-30-2022, 11:11 PM
I'll see if I can't post a pic of my 4 element LFA temporary feedpoint with RG58.

Alabama Buckeye
03-30-2022, 11:36 PM
LFA acronym or foreign to me. I'm more familiar with PVA, NVA, or LSMFT. Am wanting toroid balun for 25-30MHz.
https://www.kf7p.com/KF7P/RF_chokes.html speak of such over a very wide HF spectrum. Would rather narrow it down. Their example using RG-400 (0.195"D) only slightly less loss than RG-58, has 13 turns on a 240-?? toroid.

Im more inclined to use 12 or 14 AWG stranded copper in lieu of coax. Recommendations would be helpful?

Archy
03-31-2022, 12:05 AM
LFA stands for loop fed array. A very effective antenna.
My choke recommendations are proven.
If you are winding a 1:1, the use of stranded, silver coated, Teflon insulated wire is imperative. Well, at least from what I have read. Apparently, a current balun can be quite lossy when using alternatives like magnet wire. I avoid this and other problems like weatherproofing with a coaxial choke.

Alabama Buckeye
04-01-2022, 10:10 AM
Hate to co-opt a thread, "grnd noise base radio" here but if you'd elaborate on Teflon wire? By silver coated might I presume "tinned" strands is meant?

Or, are you speaking of coax, perhaps RG-400, when speaking of Teflon?

Yes, a 1:1 choke Balun. Too young to know benefits of any other. Number of pass-through windings is of greatest importance. Wanting to narrow down or make Balun focused to 25-30MHz bandwidth, if advisable or beneficial?

I'd gave thought to magnet winding wire; but, deterrent was wire at hand, 18 & 22 AWG. I'm thinking, wrongly or not, a 14 or 12 AWG would stand up to 1500W longer. And am inclined toward silicone jacket for flexibility.

https://www.balundesigns.com/reference/all-about-the-11-currentchoke-balun/
Seems 11 turns of RG coax prevalent in their 1.8-50MHz Baluns.

LFA Yagi Uda sure appears to have great advantage over NBS Yagi, at least on paper.

Archy
04-01-2022, 12:24 PM
Teflon insulated multi stranded silver coated wire. There's a few YT vids on this.
The choke design comes from an in depth article on audiosystems group.com

Alabama Buckeye
04-01-2022, 02:45 PM
So not coax? RG400 appears to fit the requirements?

Archy
04-01-2022, 04:44 PM
Minimum bend radius.