[Elecraft] Telephone RFI

[N2TK]

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: elecraft-bounces+tony.kaz=verizon.net at mailman.qth.net
[mailto:elecraft-bounces+tony.kaz=verizon.net at mailman.qth.net]On Behalf Of
Lawrence Makoski
Sent: Friday, August 06, 2004 7:35 PM
To: tony.kaz at verizon.net
Cc: elecraft at 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: <Wingkeel at aol.com>
To: "W2LJ" <Makos327 at worldnet.att.net>
Cc: "Elecraft Discussion List" <elecraft at 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
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