My source of S4 QRN is the electronics with a neighbour's PVC installation.

73

ATB


David W Wood

Ham call - G3YXX
FOC # - 1685
Licensed - 1969
 

-----Original Message-----
From: For blind ham radio operators [mailto:[log in to unmask]] On Behalf Of Colin McDonald
Sent: Wednesday, August 15, 2012 5:07 PM
To: [log in to unmask]
Subject: Re: G5RV and RFI/TVI?

a surger? well that is the device that causes all those pulsating noises 
right in the middle of your favorite 75 and 40 meter rag chew frequencies.
speaking of noise, I came down to the shack the other night and found that 
my noise level on all bands had dramatically increased.  Higher up in 
frequency, the noise on SSB got worse, and when I switched to AM, the noise 
was this wailing worbling carrier kind of noise.
I've never heard this particular racket from my radio, so I started thinking 
about what had changed in the house as far as new electronics or electrical 
devices since the last time I had turned the radio on.
After powering the new internet modem down, turning off the shack computer 
and a few other random things that might have started to cause noise, I 
realized that I had put my cordless drill battery on the charger the night 
before after I turned the rig off and was about to leave the shack.  I use 
the charger probably once every 6 months.  It's not plugged in unless I'm 
charging the battery.  This was the direct cause of the big racket.  I don't 
know why this particular charger was noisy, but was it ever.
It sounded like the processor in the charger that regulates the charge and 
has over charge protection and all that fancy stuff for charging a lithium 
ion battery was creating this noise.
I'm not planning on getting into it and attempt any filtering because I only 
need it rarely and for a few hours only at a time.
But it was a bit of a head scratcher for a few minutes.
So, it just confirms that you never know what might be generating random 
noise on your HF receiver, and sometimes it's hard to track it down.
In this case, I would imagine even a neighbor using one of these chargers 
would have given me noise.
Since my last neighbors moved out, I've had no additional noise on HF.  They 
turned something on every few days for several hours that gave me a good 3 S 
unit noise level on 20M and above.
generally, my noise is zero acording to the meter on everything above 14MHZ.
73
Colin, V A6BKX
----- Original Message ----- 
From: "Howard Kaufman" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, August 15, 2012 2:06 AM
Subject: Re: G5RV and RFI/TVI?


> John, it is nearing fall again, and I am thinking about that ultralyte.  I
> have heard that one of its nulls is very close to the 17 meter band.  An
> installation might land in that null given local conditions.
> I want to use it on 160 through 17 meters.  I have the i-max 2000 for 10 
> 12
> and 15.
> What do you think?
> Right now I am using a dipole that's 88 feet on a leg fed with 450 ohm
> ballenced line.
>
> Lots of noise which is generated from with in this house.  My XYL has 
> never
> found a piece of electronic toy that she doesn't like.  DVD players seem 
> to
> be particularly bad.
>
> Even the sewing machine has a computer in it.  I don't know about the
> quilting machine or the surger, what ever that is! 

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