Clamp On RF Choke Stops Noise on AC Mains
 

On Jan 20, 8:13*am, dave wrote:
On 01/20/2011 03:40 AM, RHF wrote:

hope this helps - iane ~ RHF
* .
* .

- You need mix #43 for HF

Dave : I think that the manufactures of the commonly
available Clamp-On Ferrite Cores know that. ~ RHF

Five Basic Steps to Better Shortwave Radio Listening [SWL]
 

On 01/20/2011 03:57 PM, bpnjensen wrote:


I used to live on the Southeast Corner of Peden and Van Buren in
Houston, TX. We had 72KV, 36KV, and residential feeder, all aerial. This
was the era of cheap dimmers, CRT televisions, etc. I had a lot of good
DXing from that house.

Why an Antenna Tuner May Be A Waste of Money -by- Daniel A Grunberg
 

On 1/20/2011 4:55 PM, RHF wrote:

...
BpnJ -read- Why an Antenna Tuner May Be A Waste of Money
http://www.hard-core-dx.com/nordicdx...l/notuner.html
-by- Daniel A Grunberg
-source--@- Hard Core DX .Com
...

In the country, noise is low. At my present location there is moderate
manmade noise, with a 120 ft antenna, ~35 ft in the air, a long wire
with a 9:1 unun at the antenna and a 1:1 unun at the rig, I find the
tuner invaluable. Sure, it is only useful on signals where the
broadcast signal is greater than the the noise level, but then, so is
everything else, including the receiver, only useful then ... other than
noise elimination circuitry on the more expensive models ... some DSP
actually works, and works well.

Regards,
JS

Inline Isolators for RFI reduction ?
 

On 1/20/11 17:59 , bpnjensen wrote:
On Jan 16, 11:24 am, wrote:
Question to those who may have used one - Do inline isolators work
well on RX? Such as those sold by Radioworks?

Thanks,
Bruce Jensen

I do wish to say at this point that I greatly appreciate the interest
and information on this thread. I feel like I may be able to make some
headway, even if toward nothing else than a better understanding of
the local problems. Thanks to everyone...

BJ


Wait till you get our bill.

Why an Antenna Tuner May Be A Waste of Money -by- Daniel A Grunberg
 

On Jan 20, 5:03*pm, John Smith wrote:
On 1/20/2011 4:55 PM, RHF wrote:

...
BpnJ -read- Why an Antenna Tuner May Be A Waste of Money
http://www.hard-core-dx.com/nordicdx...l/notuner.html
-by- Daniel A Grunberg
-source--@- Hard Core DX .Com
...

In the country, noise is low. *At my present location there is moderate
manmade noise, with a 120 ft antenna, ~35 ft in the air, a long wire
with a 9:1 unun at the antenna and a 1:1 unun at the rig, I find the
tuner invaluable. *Sure, it is only useful on signals where the
broadcast signal is greater than the the noise level, but then, so is
everything else, including the receiver, only useful then ... other than
noise elimination circuitry on the more expensive models ... some DSP
actually works, and works well.

Regards,
JS

John, I used to live in rural Massachusetts, and it was dreamy - quiet
backgrounds, all sorts of SA and CA DX all the time on the tropical
bands. I didn't even have the baluns - just a straight wire hooked to
Realistic Astronaut-8 and a Hammarlund HQ-100. No powerful radio
stations nearby, no industries, It was all good.

My SX-190 has a preselector on it, and it works quite well (although
the radio is *very* sensitive to intermod on 31 meters). My DX-160
has a "trimmer" tuner, and again, it works quite well - in some cases
it even has the ability to knock down an adjacent signal enough to
render it inconsequential. The Icom's filters are good enough so
these kinds of things are not too important, but a preselector might
be nice once in awhile. The Icom has a built-in DSP, not like the
Timewave's, but sufficient to reduce the background crapola.

Inline Isolators for RFI reduction ?
 

On Jan 20, 4:06*pm, John Smith wrote:
On 1/20/2011 3:59 PM, bpnjensen wrote:

On Jan 16, 11:24 am, *wrote:
Question to those who may have used one - Do inline isolators work
well on RX? *Such as those sold by Radioworks?

Thanks,
Bruce Jensen

I do wish to say at this point that I greatly appreciate the interest
and information on this thread. I feel like I may be able to make some
headway, even if toward nothing else than a better understanding of
the local problems. *Thanks to everyone...

BJ

Are they current ununs or voltage ununs?

Current "baluns" should be fine ...

Regards,
JS

I *think* they are current ununs; they advertise then as being
designed to stop stray RF from a transmitter from descending the outer
conductor. The person there says that they have no effect on RX,
which is odd considering they'd probably like to sell the things -
but she is the only one I have spoken with who says that RX is not
affected. Many other sell them expressly for this purpose.

Inline Isolators for RFI reduction ?
 

On Jan 20, 5:58*pm, "D. Peter Maus" wrote:
On 1/20/11 17:59 , bpnjensen wrote:

On Jan 16, 11:24 am, *wrote:
Question to those who may have used one - Do inline isolators work
well on RX? *Such as those sold by Radioworks?

Thanks,
Bruce Jensen

I do wish to say at this point that I greatly appreciate the interest
and information on this thread. I feel like I may be able to make some
headway, even if toward nothing else than a better understanding of
the local problems. *Thanks to everyone...

BJ

* *Wait till you get our bill.

Wait a minute - where's that Lotto ticket...?

Five Basic Steps to Better Shortwave Radio Listening [SWL]
 

On Jan 20, 7:29*pm, dave wrote:
On 01/20/2011 03:57 PM, bpnjensen wrote:

I used to live on the Southeast Corner of Peden and Van Buren in
Houston, TX. We had 72KV, 36KV, and residential feeder, all aerial. This
was the era of cheap dimmers, CRT televisions, etc. I had a lot of good
DXing from that house.

Don't forget about the soil conductivity- sometimes it helps greatly.

Inline Isolators for RFI reduction ?
 

On Jan 20, 9:09*pm, bpnjensen wrote:
On Jan 20, 5:58*pm, "D. Peter Maus" wrote:





On 1/20/11 17:59 , bpnjensen wrote:

On Jan 16, 11:24 am, *wrote:
Question to those who may have used one - Do inline isolators work
well on RX? *Such as those sold by Radioworks?

Thanks,
Bruce Jensen

I do wish to say at this point that I greatly appreciate the interest
and information on this thread. I feel like I may be able to make some
headway, even if toward nothing else than a better understanding of
the local problems. *Thanks to everyone...

BJ

* *Wait till you get our bill.

Wait a minute - where's that Lotto ticket...?- Hide quoted text -

- Show quoted text -

Make sure Cuhoo's doggy didn't eat it. And, incidentally Mass. has
very good anomalies as far as HF is concerned . Scituate location's
conditions are quite favorable and it was a site of a major SW
transmitter for many years .

Why an Antenna Tuner May Be A Waste of Money -by- Daniel A Grunberg
 

On 1/21/2011 1:00 AM, Bob Dobbs wrote:
John Smith wrote:
other than
noise elimination circuitry on the more expensive models ... some DSP
actually works, and works well.

Seems to me that DSP NR is basically a glorified treble control,
initializes to the background and ignores the variations (voice)

In real DSP, the audio is processed by a CPU, it is "examined." And,
noise is attempted to be "identified."

One example, the human voice has slow rise and fall times, generally, on
pronunciation and sound formation, where noise has fast attack and delay
speeds.

As patents expire, we may see decent circuitry on even moderately priced
and cheap receivers.

Regards,
JS