Here are a couple of things to try: - Try another phone. Radio Shack phones seem to work well around RF - Move the phone to another jack and see if the problem still exists. - Make sure you have a good ground for the ham equipment. - Sometimes adding a length of coax changes the problem. - Do you have the problem if the phone stays in its cradle? Can you operate this phone from the cradle? - Make sure you don't have a poor connection somewhere in the phone system. It may be picking up the rf, and rectifying it. - Unplug nay other phones and try it. - Put ferrite on the coax
One time I had a similar problem. It turned out to be a metal clothes line. The turnbuckle rusted. This made a nice diode. The wire picked up the rf, rectified it and reradiated it on multiple frequencies. Good Luck, N2TK, Tony -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Lawrence Makoski Sent: Friday, August 06, 2004 7:35 PM To: [EMAIL PROTECTED] Cc: elecraft@mailman.qth.net Subject: Re: [Elecraft] Telephone RFI Terry, I have used the KComm telephone filters with great success. The other option you don't mention is to change brands of telephone. When I was having problems, it was with a Bell South portable. The KComm filter cleared up the problem. When the phone eventually gave up the ghost, I switched to a Panasonic and found I no longer needed the filter. Best luck! 73 de Larry W2LJ ----- Original Message ----- From: <[EMAIL PROTECTED]> To: "W2LJ" <[EMAIL PROTECTED]> Cc: "Elecraft Discussion List" <elecraft@mailman.qth.net> Sent: Friday, August 06, 2004 7:08 PM Subject: [Elecraft] Telephone RFI > Hi everyone, > > I have two antennas...an unmatched longwire and a vertical. The > unmatched longwire interferes with our two line 900MHz phone system a little bit but > the vertical almost destroys audible altogether. While transmitting CW on the > vertical, there is a loud clicking sound on both the receiving AND > transmitting telephone, even though one or the other could be removed by several miles. > > The phone line within the building is all CAT-5 with the exception of the > last 15' of the base station telephone. I've tried 10 turns of flat 4-conductor > telephone cord through a toroid...no difference, (however, I don't know what > the toroid is made of). I've tried one of the clamp on decouplers with no > change. I can't put a coupling capacitor on the line because of our high speed > DSL. > > It only happens on 40 and 80 meters. There is no interference at 20 meters. > Does anyone know who builds telephone RFI filters for this frequency range? > I called the local phone company and they said that they don't have anything > to do with aircraft frequencies (????). I figured it would be fruitless to > pursue this avenue of approach! > > If I don't get this fixed pretty soon, one of three things will happen: > 1. Discontinue use of my K2 between the hours of 0600-2300. > 2. Find a solution to this dilemma. > 3. Become a priest, because I'll be celibate after this anyway. > > Thanks in advance > > Terry de KC0QZX > _______________________________________________ > Elecraft mailing list > Post to: Elecraft@mailman.qth.net > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com > _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
