Martin:
I tried the speaker with the wall-wart disconnected and on battery power,
but no joy.
I also tried chokes on both the wallwart power cord, and the speaker wire,
but again, no luck.
I don't have small-enough chokes to tri for both conductors in the speaker
wire and the wallwart wire, but that is an interesting thought.
Keep those ideas coming!
Tom Behler: KB8TYJ
----- Original Message -----
From: "Martin McCormick" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, May 07, 2012 3:00 PM
Subject: Re: Interesting RFI Problem
> You might disconnect the speaker from the wall wart and
> the audio source which means, of course, that you can't use it
> right now, but see if the RFI is still audible. Then, connect
> the wall wart but leave the audio input lead off and see if your
> RFI comes back. It is possible that it is coming in via both the
> audio input cable and the power cable. You might need chokes on
> both sides of the audio input line and both conductors in the
> power cord from the wall wart.
>
> Bob Martin writes:
>> I had that problem on 40 meters with a set of Utah speakers. Tryed
>> chokes,
>> shortening the leads to the speakers, and finally a counterpoise for 40
>> as I
>> was on the second floor. The counterpoise did the trick. Made it by
>> shorting a 33 inch of ordinary electrical wire on one end and attaching
>> the
>> others to the terminals on my tuner.
>>
>> 73:
>> Bob Martin
>>
>> EchoLink Node - 55127
>> Please visit http://www.wan-leatonks.net.
>> ----- Original Message -----
>> From: "Tom Behler" <[log in to unmask]>
>> To: <[log in to unmask]>
>> Sent: Monday, May 07, 2012 7:04 AM
>> Subject: Interesting RFI Problem
>>
>>
>> > Hi, all.
>> >
>> > Well, I have an interesting little RFI problem here in the home shack
>> that
>> > I've been scratching my head over lately.
>> >
>> > At the estate sale I've been talking about, I picked up a Realistic
>> > 32-2040
>> > amplified speaker. The speaker either runs on 6 C-cell batteries, or
>> the
>> > supplied 9-volt wallwart.
>> >
>> > The speaker sounds terrific, with excellent quality audio that I can
>> > adjust
>> > in terms of tone and volume from the speaker itself.
>> >
>> > However, when I transmit with my TS590, using my amplifier, I get lots
>> of
>> > RFI through the speaker itself.
>> >
>> > I have tried RF chokes on both the Wallwart power cord, and the phono
>> plug
>> > connection between the Ts590 and the speaker itself, but no joy.
>> >
>> > I have tried running the speaker just on batteries, but still get the
>> RFI.
>> >
>> > Obviously, this particular speaker is more susceptible to RFI than
>> usual,
>> > since I don't get the RFI at all when using other speakers such as my
>> > Motorola amplified speaker or just a standard external speaker.
>> >
>> > Does anyone have any suggestions as to what else I might try?
>> >
>> > I'd love to use the speaker since it sounds so good, but the RFI issue
>> may
>> > make that impractical in the long run.
>> >
>> > 73 from Tom Behler: KB8TYJ
>>
>>
>
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