http://www.ky-filters.com

Hi I recently visited your website and wanted to ask a question about your Modem Filters. I have a phone modem and I am having an interference problem. I am pretty sure that the interference problem is coming from my neighbors electric fence charger. I can hear the fence charger's tic tic sound through my modem. When the fence charger is plugged up I cannot connect to the Internet, but when we unplug the fence charger my modem connects normally. Does your product stop this kind of interference? If not, can you suggest a possible solution. Thank you


Thanks for the inquiry. Our technicians tell us that the problem is caused by bad (corroded)connections where the fence wire sections connect together. The high voltage sparks or arcs across these places causing a very wide spectrum signal that our filters probably will not help. (You might be able to see the sparks, at night, in the dark) The simple fix, short of soldering all these connections, is to paint across each wire junction with silver conductive paint. I hope that this is of some help. Sincerely, John K. Browne



John!
Just thought you'd like to know:
The Problem
==========
New USRobotics 56k Faxmodem was unusable because of severe RF interference. This modem replaced a Practical Peripherals 38.8 modem. User had complained about connection difficulties, and unexpected hang-ups.
The Solution
=========
Your RF-1 filter fixed the problem COMPLETELY. Dialtone is clean and clear, and we're getting connection speeds of 53.3.
Thanks!
Greg

What frequency range is covered by your telephone filter device?
I live 200 yards from an AM radio transmitter (1080 KHz) and the signal infiltrates everything I own. :-)

Now I know you can't predict the results, because there are so many factors involved, but will the choke in your filter be a good filter for 1080 KHz?
Thanks for any info.
-Jim H

Jim,
Thanks for the inquiry. Yes our filter works extremely well over the whole am broadcast band (1080kHz). Also we have a money back policy if it doesn't help your situation.
Thanks again.
Sincerely,
John K. Browne

John,
Thanks for such a quick response. I ordered TWO. :-) Let's hope that between the filters and some proper grounding, I'll be free of this radio station from hell. :-)
Jimbo

Jim,
Thanks for the order. We shipped your filters earlier this evening (Monday) first class US post office. You should get them Wednesday or Thursday. Don't hesitate to contact me if there is any problem or if you have any questions. Thanks again. Sincerely, John Browne

John,
They arrived today.
Simply amazing. The first quiet phone calls I've had in months. ;-)
Tomorrow morning will be the big test. I have some interesting ground loops in the wiring/cable TV here that are worse when the sun comes up-- and since the decoders also share this line, it will be interesting to see what happens. :-)
But so far so good! If they pass the morning test, I will likely order two more for my neighbors.
Thanks!
-Jimbo (Santa Cruz, CA)

Mr Browne,
I just got your filter the other day, and it completely solved my problem. I want to extend my thanks and regards for your wonderful product. I tried everything, from adjusting the phone line to buying a new modem, months of agony to solve this problem. The aspect that it might be RFI never crossed my mind until I tried a few experiments until the clues and suggestions from friends led to the suspicion that it was RFI. The kicker was that the interference only happened upstairs in the house (which you said might be because of the phone lines in the wall acting like an antenna) and was time dependent, only occurring at specific times during the day, and other times not.
So, when I plugged in your filter I was skeptical and a bit fearful that it might not work, and was already tired of trying everything else, I was happily surprised and delighted that it completely nullified the interference. However, the only thing that I noticed was that if it's positioned a certain way, the line signal doesn't go through the filter all the way correctly, so you have to mess with the jack and the plugs to get it to work sometimes, which is okay, as long as I can get it to work again. That wouldn't be a defective filter would it, if it only works in certain positions or are the connections just sensitive? Anyway, thanks for a good product that actually works. I never knew anything about RFI until I stumbled on your site and fixed my problem.
Thanks,
John S.

John,
Thanks for the positive feedback. I'm glad it works for you. It sounds like the connector is defective, however. I will send you a replacement asap. It may take a few days to get there. Just keep the defective one for your troubles.
Sincerely,
John K. Browne


Hello
Can you help me? I was told that I must have a phone filter on my home security system to receive DSL and to block the noise. I understand that it's an 8 wire filter, much larger than a regulr size phone filter. Do you have one? If not, can you please tell me where I can get one.
Thank's for your help.
John F.

John,
Thanks for the inquiry! You might try the following url for the type of filter that you need:
http://www.elect-spec.com/phone_z.htm#TURBO
Best regards,
John K. Browne


Hi John,
That RF-1 did it! Before, 5 watts on 10 meters would put the computer on the floor. Now I can watch the dx cluster and run 500 watts and the computer just keeps on humming along. Many thanks.
73 Waymon from Tennessee

On behalf of M. W., we would like to thank you for the filters which killed the RF on her phone. The RF only appeared after I installed a headset with amp on her Meridian 9417 2 line set. The set is on the second floor and I bypassed the attic wiring with a more direct and shorter run of wire to the basement with no difference. I even tried using RG58 coax and Radio Shack's ferrites on the set cords with no joy. I temporarily tried one of the filters on a phone with a built in AM/FM radio in the bedroom which has always had 2 AM stations booming in and they were killed. None of the other 6 phones in the house get RF. I used to carry RF filters on my truck before I retired a year ago when I occasionally installed broadcast circuits for the phone company. I will get one of those filters for the bedroom phone from my son who had one in place on his line when there was an AM transmitter in his area. Thanx again. D.E.



I just wanted to write and tell you how pleased I am that your product exists. I was experiencing so much noise on my phone line that was preventing my fax equipment from receiving calls. It was actually hurting my business. Of course, the phone company was no help and claimed that my line supposedly passed their tests. On my own, I amplified the line and could hear a particular pattern of static that I suspected might be some kind radio interference. Not knowing what to do, I went to my local Radio Shack and purchased their “RF line-noise filter” with high hopes. Believe it or not, introducing this device actually made the problem WORSE. Instead of hearing varying static, I could then hear AM 640 coming through crystal clear on my telephone line. Having discovered that it was an AM radio station that was interfering, I scoured the internet for a better filter. That’s when I discovered your product. After being discouraged by the failure of Radio Shack’s finest, I was a little skeptical of your filter. However, I still needed a solution and was willing to give it a try. What really sold me was that a customer in one of your testimonials actually mentioned that he also tried the Radio Shack filter and found that it worsened his problem too! This compelled me to believe your site’s claims and actually give your AM filter a try. Sure enough, it reduced the interference COMPLETELY! When I amplify my line now, I don’t hear a speck of static and my faxes come in at high speed every time!
Thank you so much!
A satisfied user of the AM-1 filter



John,
just thought you might like to know. I installed the RF-1 filter at the line input on my answering machine, turned on my HF rig, did a broadcast on 75 meters, and bingo! No interference to my answering machine.
Thanks. There are a couple of other guys I can tell about this. Have a good day.
Bill


Hello, John.

I recently ordered an AM filter from you and am thrilled at the results. I wanted to write to say thank you!

My house is located 0.36 miles from an AM radio station that broadcasts with a four-antenna array at 50kW (daytime) at 990kHz. I thought I would escape the problem that others in the neighbor hood have with RF interference by using a Voice over IP system instead of a traditional landline from the phone company. In theory that was a good idea, but in practice the VoIP interface box (Cisco ATA 186) is very susceptible to RF. With one phone directly hooked into the ATA, everything was OK, but as soon as I hooked the ATA to my house's phone wiring, the AM station came through loud and clear even if no phones were hooked to any of the extensions. It was apparent that the house wiring was acting as an antenna and that the ATA was rectifying the signal. The small filters the radio station provided had no effect, and I was very frustrated.

I was tempted to replace the house's 27-year-old phone wire with expensive shielded twisted pair. I also contemplated buying an expandable wireless phone system for about $250 that would have replaced my hard-wired phones with mobile extensions. Neither of those options were particularly attractive.

I am very glad I found your Web site using Google. Your AM-1 filter did the trick. After I plugged it in, I couldn't believe how crystal clear the phone became. It was certainly the best $28 I've ever spent on telephone equipment.

Very truly yours,
S.S. Pennsylvania, USA



Hello,
I was looking at your website and have a question. I just recently signed up for voice over internet phone service and am having issue swith hearing a local AM station on my phone. When I had landline phone service, I had absolutely no issues with phone sound quality. I have a Linksys broadband router with phone ports now connected to my home phone wiring system that is back feeding my house wiring through one of the wall jacks after of course physically disconnecting my house from the previous land line service.
What filter solution of yours would you recommend?

JK from Michigan


JK,
Thanks for the inquiry. I am not really familiar with your setup. It is possible that one of our AM-1 filters connected between the telephone line and your computer may solve the problem (I am not sure what type of connectors are used in your system. Our filters use RJ11 connectors). If the AM-1 doesn't solve the problem, we have a money back guarantee. I hope that this info is helpful to you.

John Browne


John,
I received the AM-1 filter today and immediately installed it on the phone cord between the telephone adapter and the wall jack backfeeding the house wiring. It was just the ticket. Dead silence! After the dial tone, I pressed the first number and dead silence. I had to check to see if something got disconnected. I had a Radio Shack filter in-line which reduced the noise but definitely left alot to be desired. Your filter was definitely just what I needed. I called AT&T before all this after signing up for the CallVantage service (phone over internet), they wanted to charge me $135 for the service call if they sent out a technician and found that the noise was not the fault of the telephone adapter equipment they provided me for the service. Needless to say, the filter at $28 was money well spent.

You should call AT&T and offer your filter to them for resale. Thank You!
JK








Reading you FAQ's section, I came across the comment in regards to AM and Radio Shack Filters. I live close to KOMO AM towers (AM 1000) in the Seattle Area and get heavy interference on my phone lines. I have tried Radio Shack Filters and filters provided by KOMO, all without success. Will your AM-1 filter work for the AM frequency? I currently have 2 cordless phones, one answer machine and one modem attached.

Bill,
Thanks for the inquiry.
Yes, our AM-1 works much better at that frequency. The Radio Shack filters work best on the higher short wave frequencies similar to our RF-1 filter. Actually KOMO's frequency of 1000 KHz is just at the lower edge of what is considered "short wave") The AM-1 is designed specifically for AM broadcast frequencies and attenuates 1000 KHZ by a factor of a few hundred times.
Your situation is somewhat complicated by the fact that you have some equipment connected that is powered from the ac lines. Sometimes the interference comes in over the ac power line and it may be necessary to filter the ac cord as shown at the following url:
http://www.ky-filters.com/ac.htm
I hope that this info is of some help.

John Browne



Subject: filters
I am relatively naïve re filters. I have dsl connection with dsl filters that came with computer; they seem fine. however, I have problems on my phone line. there is a spanish language station one block away. I have one corded phone (radio shack) and one mobile phone both on same line. I have to record a daily phone call for a work project -- recording to be transcribed. When I added a radio shack filter to phone line it worked some until I added dsl filter. I have a phone recorder hooked up to the phone. I get interference across both phones, less on the mobile. However, I do most recording off the corded phone. which filter and configuration would you recommend. thanks.
Wendy,
Thanks for the inquiry.
The DSL filter is used to separate the DSL data signal from the telephone voice.
I am not sure where you installed the Radio Shack filter. To stop interference to the telephone, it should go between the DSL filter and the telephone.
The Radio Shack RFI filters do not filter very well at the AM broadcast frequencies. I assume that the Spanish language is an AM broadcast station.
Our AM-1 filter works very well on that kind of interference. An AM-1 installed between the DSL filter and the corded telephone should remove the Spanish language transmissions from your phone. If the telephone itself is powered from the ac line cord, you may need to filter that line also.
Your situation is complicated by the fact that you have a number of devices connected and also by the fact that some of them are powered from the ac outlet.
You may have to filter the ac cord going to some of those pieces of equipment. A simple scheme for doing this can be found at the following address:
http://www.ky-filters.com/ac.htm
I hope that this information is of some help.
John Browne

Greetings sir,
I purchased an AM RF filter from you approx. 3 years ago. I must say it has worked absolutely perfect for me up until about a month ago. The interference is back and it doesn't make any difference how or where I plug in the filter now. My surroundings have not changed in my office and I don't know of any changes in transmit power, etc. from the nearby AM radio station. My question is do these filters fail over time? If so is it covered for replacement? Any help would be greatly appreciated!


The filter contains a choke made of wire wrapped around a ferrite core. It is a very stable mixture. Nothing, short of a nuclear blast (extreme heat), will change the characteristics of the ferrite or the wire. Most likely, something in the phone wiring, external to the filter, is now rectifying the radio signal. Rectification changes a radio frequency signal to an audio frequency signal. The RF filter will not filter out an audio signal. It will only filter out RF. The most common cause of rectification is a bad or corroded connection. I have seen this type of problem solved just by tightening a screw connector at the offending terminal.. Another common rectifier is the lightening arrestor. The house telephone wiring has a lightning arrestor (spark gap to ground) somewhere in the system and these sometimes become fused or welded together from the static electricity and this makes a rectifier. I can send you a replacement filter, if you like, but if it is what I say it is, a new filter will have the same problem. I hope that this info is of some help.

John Browne


John,
Thank you kindly for your expert suggestions to correct my interference problem. My apologies but I completely forgot my wife had added a printer/Fax/copier to the same business line downstairs about a month ago. After reading your suggestions above, I happened to think of that, unplugged it.... no more background noise/talking from the nearby AM radio station. I suppose from reading some of the info on your website, the fax was the culprit. Again, sorry to have bothered you. Thanks again for a product that actually works!
Best Regards.


bingo online

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