A Beginners Question
 

I would like to buy a portable shortwave radio with a whip antenna but I've
been holding back because I live in an area that gets mediocre reception on
my Sony reciever's FM tuner from stations 20 miles away; so I'm really
paranoid about buying a portable shortwave radio. My homeowners association
doesn't permit outside antennas. Here are several questions:

1. Can someone recommend a portable shortwave radio for under $200US that
works well.?
2. Can I attach an indoor antenna to improve reception? What brand of
antenna?
3. I've tried several indoor antennas from Radio Shack to improve my FM
reception and none did anything. Can someone recommend a really powerful FM
indoor antenna?

Thanks in advance.
Frank

A Beginners Question
 

Frank103 wrote:

I would like to buy a portable shortwave radio with a whip antenna but
I've been holding back because I live in an area that gets mediocre
reception on my Sony reciever's FM tuner from stations 20 miles away; so
I'm really paranoid about buying a portable shortwave radio. My homeowners
association doesn't permit outside antennas. Here are several questions:

1. Can someone recommend a portable shortwave radio for under $200US that
works well.?

Sony 7600GR. Try,
http://www.jr.com/JRProductPage.process?Product=1627439

2. Can I attach an indoor antenna to improve reception? What brand of
antenna?

Yes, for shortwave a 10-20 foot piece of wire can be used. You do not need
to spend a lot of money to get started. If noise is an issue, google
for 'shielded loop antenna'. You can also buy more expensive antennas. Try,
http://www.universal-radio.com/catalog/sw_ant.html


3. I've tried several indoor antennas from Radio Shack to improve my FM
reception and none did anything. Can someone recommend a really powerful
FM indoor antenna?


I doubt anyone really can recommend one that works. However, if the stations
of interest are all in the same direction, you could consider mounting a 5
element yagi antenna for FM in your attic. (If your roof is metal this
probably won't work.) Google for 'fm yagi antenna'.


Thanks in advance.
Frank

A Beginners Question
 

On Dec 4, 3:36 pm, "Frank103" wrote:
I would like to buy a portable shortwave radio with a whip antenna but I've
been holding back because I live in an area that gets mediocre reception on
my Sony reciever's FM tuner from stations 20 miles away; so I'm really
paranoid about buying a portable shortwave radio. My homeowners association
doesn't permit outside antennas. Here are several questions:

1. Can someone recommend a portable shortwave radio for under $200US that
works well.?
2. Can I attach an indoor antenna to improve reception? What brand of
antenna?
3. I've tried several indoor antennas from Radio Shack to improve my FM
reception and none did anything. Can someone recommend a really powerful FM
indoor antenna?

Thanks in advance.
Frank

You didn't tell us what model Sony receiver you are using, and what
type of antenna it has. That can make a big difference in what I
would recommend. Without knowing what you already have, you might
consider the CCRadio-SW, or the equivalent under another brand name.
I have it and have found the FM sensitivity to be outstanding. It
actually gets outstanding reception of stations that come in poorly on
the CCRadio and other radios I have. It is also excellent on MW and
SW. If an analog tuner is okay with you, I don't believe you will be
able to top the CCRadio-SW.

A Beginners Question
 

Yes, for shortwave a 10-20 foot piece of wire can be used. You do not need
to spend a lot of money to get started. If noise is an issue, google
for 'shielded loop antenna'. You can also buy more expensive antennas.
Try,
http://www.universal-radio.com/catalog/sw_ant.html


Why would a shielded loop receive less noise than, say, a classic wire turn
loop?

Dale W4OP

A Beginners Question
 

Dale Parfitt wrote:


Yes, for shortwave a 10-20 foot piece of wire can be used. You do not
need to spend a lot of money to get started. If noise is an issue, google
for 'shielded loop antenna'. You can also buy more expensive antennas.
Try,
http://www.universal-radio.com/catalog/sw_ant.html


Why would a shielded loop receive less noise than, say, a classic wire
turn loop?

Dale W4OP

Dale,

I made no shielded loop vs. unshielded loop comparisons. My intent was to
give the beginner the idea that there are different types of antennas, and
by suggesting google, allow the OP to do some research on his own.

That being said, building a shielded loop implies the OP has shielded wire
which can also be used for the connection between the radio and the
antenna. This is probably better then building an unshielded loop out of
speaker wire and using the same wire to connect the antenna to the radio.

Again, I gave the OP the opportunity to do some research.

On the other hand, I used a shielded loop in a previous home as a random
wire antenna was not an option.

craigm

A Beginners Question
 

Gary, the Sony receiver is model GX700 ES and the antenna is the standard FM
antenna that came with the receiver. It's probably about 10 years old by
now and still sounds good. It picks up about half of the FM stations that
are available in my area - Las Vegas. Here's what I don't understand. There
are 2 stations. 88.9 and 89.7. Both are NPR with HD. The first one is news
and the second one is classical music. I can get the news station fine. But
what I really want is the music station which is nothing but static. Being
in a county with 2 million people one would think that there would be more
than one classical music station but there is only one and all I get from it
is static. A Radio Shack amplified antenna was not help at all.
Frank
wrote in message
...
On Dec 4, 3:36 pm, "Frank103" wrote:
I would like to buy a portable shortwave radio with a whip antenna but
I've
been holding back because I live in an area that gets mediocre reception
on
my Sony reciever's FM tuner from stations 20 miles away; so I'm really
paranoid about buying a portable shortwave radio. My homeowners
association
doesn't permit outside antennas. Here are several questions:

1. Can someone recommend a portable shortwave radio for under $200US that
works well.?
2. Can I attach an indoor antenna to improve reception? What brand of
antenna?
3. I've tried several indoor antennas from Radio Shack to improve my FM
reception and none did anything. Can someone recommend a really powerful
FM
indoor antenna?

Thanks in advance.
Frank

You didn't tell us what model Sony receiver you are using, and what
type of antenna it has. That can make a big difference in what I
would recommend. Without knowing what you already have, you might
consider the CCRadio-SW, or the equivalent under another brand name.
I have it and have found the FM sensitivity to be outstanding. It
actually gets outstanding reception of stations that come in poorly on
the CCRadio and other radios I have. It is also excellent on MW and
SW. If an analog tuner is okay with you, I don't believe you will be
able to top the CCRadio-SW.

A Beginners Question
 

In article KCy5j.2781$md.534@trnddc06,
"Dale Parfitt" wrote:


Yes, for shortwave a 10-20 foot piece of wire can be used. You do not need
to spend a lot of money to get started. If noise is an issue, google
for 'shielded loop antenna'. You can also buy more expensive antennas.
Try,
http://www.universal-radio.com/catalog/sw_ant.html


Why would a shielded loop receive less noise than, say, a classic wire turn
loop?

Dale W4OP

Shielded loops are less sensitive to local inductive E fields.

--
Telamon
Ventura, California

A Beginners Question
 

"Telamon" wrote in message
...
In article KCy5j.2781$md.534@trnddc06,
"Dale Parfitt" wrote:


Yes, for shortwave a 10-20 foot piece of wire can be used. You do not
need
to spend a lot of money to get started. If noise is an issue, google
for 'shielded loop antenna'. You can also buy more expensive antennas.
Try,
http://www.universal-radio.com/catalog/sw_ant.html


Why would a shielded loop receive less noise than, say, a classic wire
turn
loop?

Dale W4OP

Shielded loops are less sensitive to local inductive E fields.

--
Telamon
Ventura, California

I thought there was enough math/data out there that no one any longer
believed this.

From the W8JI page- http://www.w8ji.com/magnetic_receiving_loops.htm
"Folklore claims a small "shielded" loop antenna behaves like a sieve,
sorting "good magnetic signals" from "bad electrical noise".
Nothing is further from the truth! At relatively small distances a small
magnetic loop is more sensitive to electric fields than a small electric
field probe.



W4OP

A Beginners Question
 

On Dec 5, 7:13 am, craigm wrote:
Dale Parfitt wrote:

Yes, for shortwave a 10-20 foot piece of wire can be used. You do not
need to spend a lot of money to get started. If noise is an issue, google
for 'shielded loop antenna'. You can also buy more expensive antennas.
Try,
http://www.universal-radio.com/catalog/sw_ant.html

Why would a shielded loop receive less noise than, say, a classic wire
turn loop?

Dale W4OP

Dale,

I made no shielded loop vs. unshielded loop comparisons. My intent was to
give the beginner the idea that there are different types of antennas, and
by suggesting google, allow the OP to do some research on his own.

That being said, building a shielded loop implies the OP has shielded wire
which can also be used for the connection between the radio and the
antenna.

- This is probably better then building an unshielded loop
- out of speaker wire and using the same wire to connect
- the antenna to the radio.


Again, I gave the OP the opportunity to do some research.

On the other hand, I used a shielded loop in a previous
home as a random wire antenna was not an option.

craigm

Craig M.,

Actually Loop {Balance} Antenna make from Speaker-Wire and
using the same Speaker-Wire {Balanced} as a feed-in-line
is a fairly simple and practical Loop Antenna set-up.

Just like a "Split" Speaker-Wire Dipole Antenna using the
same Speaker-Wire {Balanced} as a feed-in-line is a
fairly simple and practical Dipole Antenna set-up.

Both can be very low cost and effective Shortwave Listening
(SWL) Antennas not requiring a Ground to give relatively
Good Signal Levels and Low Noise.

RadioShack - Recoton (SW-1850) 50Feet 18 AWG Speaker Wire
http://www.radioshack.com/product/in...ductId=2428008

iane ~ RHF

A Beginners Question - FM Radio Reception and FM Antennas
 

On Dec 5, 8:48 am, "Frank103" wrote:
Gary, the Sony receiver is model GX700 ES and the antenna is the standard FM
antenna that came with the receiver. It's probably about 10 years old by
now and still sounds good. It picks up about half of the FM stations that
are available in my area - Las Vegas. Here's what I don't understand. There
are 2 stations. 88.9 and 89.7. Both are NPR with HD. The first one is news
and the second one is classical music. I can get the news station fine. But
what I really want is the music station which is nothing but static. Being
in a county with 2 million people one would think that there would be more
than one classical music station but there is only one and all I get from it
is static. A Radio Shack amplified antenna was not help at all.
wrote in message

...



On Dec 4, 3:36 pm, "Frank103" wrote:
I would like to buy a portable shortwave radio with a whip antenna but
I've
been holding back because I live in an area that gets mediocre reception
on
my Sony reciever's FM tuner from stations 20 miles away; so I'm really
paranoid about buying a portable shortwave radio. My homeowners
association
doesn't permit outside antennas. Here are several questions:

1. Can someone recommend a portable shortwave radio for under $200US that
works well.?
2. Can I attach an indoor antenna to improve reception? What brand of
antenna?
3. I've tried several indoor antennas from Radio Shack to improve my FM
reception and none did anything. Can someone recommend a really powerful
FM
indoor antenna?

Thanks in advance.
Frank

You didn't tell us what model Sony receiver you are using, and what
type of antenna it has. That can make a big difference in what I
would recommend. Without knowing what you already have, you might
consider the CCRadio-SW, or the equivalent under another brand name.
I have it and have found the FM sensitivity to be outstanding. It
actually gets outstanding reception of stations that come in poorly on
the CCRadio and other radios I have. It is also excellent on MW and
SW. If an analog tuner is okay with you, I don't believe you will be
able to top the CCRadio-SW.- Hide quoted text -

- Show quoted text -

Frank 103,

A Beginners Question - FM Radio Reception and FM Antennas

The SR-100 Silver Ribbon Tunable FM Antenna by Magnum Dynalab
http://www.magnumdynalab.com/fmantennas-sr100.htm
Designed to be used In-Doors and You can 'Adjust-It' and
'Rotate-It' for the best Reception of the specific FM Radio
Station that you are trying to hear.

Check-Out the "FM Antennas FAQs" by Magnum Dynalab
http://www.magnumdynalab.com/fmantennas-sr100.htm

C Crane FM Reflect Antenna by C. Crane Co.
http://www.universal-radio.com/catalog/mwant/0143.html
* This is a "Passive' FM Antenna that can be mounted
On-the-Wall; or Hidden-behind-Draps; or Under-the-Carpet.

Terk "FM Pro" {FM-50} FM Antenna
http://www.universal-radio.com/catalog/mwant/3825.html
* This is an Active {Amplified} FM Antenna that can be
mounted In-Doors; In-the-Attic; or Out-Side Under-the-Eaves.

READ - Improving FM Radio Reception : The Better Antennas To Use
http://groups.google.com/group/rec.a...420981a553930b

READ - Serious 'portable' FM Radios for DXing the FM Band
http://groups.google.com/group/rec.r...a23d4d7ab0ba14

READ - Follow-Up - Two Key 'Features' In Any Portable
FM Radio That Are Worth Considering For DXing The FM
Band Are :
http://groups.google.com/group/rec.r...edc1e05ab1e40a


f m magic - iane ~ RHF {pomkia}

A Beginners Question
 

Frank I live in a marginal FM area and since I have a Redsun RP2100 I
have no trouble at all getting far distant stations. My other
portables and my stereo won't receive them at all.
You got good advice for a CC Radio SW, and there is also the cheaper
Kaito KA2100, all of which are the same as the Redsun RP2100. A superb
performer on FM.
See: http://www.universal-radio.com/catal...able/2100.html

Universal also do a range of FM antenna's, but I don't have any
experience with those. Have a look at:
http://www.universal-radio.com/catalog/mwant.html
You need to see that the connectors on these devices match the FM
radio you have in mind.

Good reception

John Plimmer, Montagu, Western Cape Province, South Africa
South 33 d 47 m 32 s, East 20 d 07 m 32 s
RX Icom IC-756 PRO III with MW mods
Drake SW8 & ERGO software
Sony 7600D, GE SRIII, Redsun RP2100
BW XCR 30, Sangean 803A.
Antenna's RF Systems DX 1 Pro Mk II, Datong AD-270
Kiwa MW Loop, PAORDT Roelof mini-whip
http://www.dxing.info/about/dxers/plimmer.dx

On Dec 5, 1:36 am, "Frank103" wrote:
I would like to buy a portable shortwave radio with a whip antenna but I've
been holding back because I live in an area that gets mediocre reception on
my Sony reciever's FM tuner from stations 20 miles away; so I'm really
paranoid about buying a portable shortwave radio. My homeowners association
doesn't permit outside antennas. Here are several questions:

1. Can someone recommend a portable shortwave radio for under $200US that
works well.?
2. Can I attach an indoor antenna to improve reception? What brand of
antenna?
3. I've tried several indoor antennas from Radio Shack to improve my FM
reception and none did anything. Can someone recommend a really powerful FM
indoor antenna?

Thanks in advance.
Frank

A Beginners Question
 

On Dec 7, 10:08 am, wrote:
Frank I live in a marginal FM area and since I have a Redsun RP2100 I
have no trouble at all getting far distant stations. My other
portables and my stereo won't receive them at all.
You got good advice for a CC Radio SW, and there is also the cheaper
Kaito KA2100, all of which are the same as the Redsun RP2100. A superb
performer on FM.
See:http://www.universal-radio.com/catal...able/2100.html

Universal also do a range of FM antenna's, but I don't have any
experience with those. Have a look at:http://www.universal-radio.com/catalog/mwant.html
You need to see that the connectors on these devices match the FM
radio you have in mind.

Good reception

John Plimmer, Montagu, Western Cape Province, South Africa
South 33 d 47 m 32 s, East 20 d 07 m 32 s
RX Icom IC-756 PRO III with MW mods
Drake SW8 & ERGO software
Sony 7600D, GE SRIII, Redsun RP2100
BW XCR 30, Sangean 803A.
Antenna's RF Systems DX 1 Pro Mk II, Datong AD-270
Kiwa MW Loop, PAORDT Roelof mini-whiphttp://www.dxing.info/about/dxers/plimmer.dx

On Dec 5, 1:36 am, "Frank103" wrote:



I would like to buy a portable shortwave radio with a whip antenna but I've
been holding back because I live in an area that gets mediocre reception on
my Sony reciever's FM tuner from stations 20 miles away; so I'm really
paranoid about buying a portable shortwave radio. My homeowners association
doesn't permit outside antennas. Here are several questions:

1. Can someone recommend a portable shortwave radio for under $200US that
works well.?
2. Can I attach an indoor antenna to improve reception? What brand of
antenna?
3. I've tried several indoor antennas from Radio Shack to improve my FM
reception and none did anything. Can someone recommend a really powerful FM
indoor antenna?

Thanks in advance.
Frank- Hide quoted text -

- Show quoted text -

HeartLandAmerica.Com has the "Silicon Scientific" Multi-Band
Digital AM/FM Shortwave Radio RP2000 'On-Sale-For' $49
http://www.hlaimages2.com/prod_images/500/75498.jpg
http://www.heartlandamerica.com/brow...adio&PIN=54168

IMHO - This 'appears-to-be' a Redsun RP2100 Radio that
has been Re-Branded with the "Silicon Scientific" Name.

~ RHF

A Beginners Question
 

In article EBJ5j.5593$gi7.4456@trnddc04,
"Dale Parfitt" wrote:

"Telamon" wrote in message
...
In article KCy5j.2781$md.534@trnddc06,
"Dale Parfitt" wrote:


Yes, for shortwave a 10-20 foot piece of wire can be used. You
do not need to spend a lot of money to get started. If noise is
an issue, google for 'shielded loop antenna'. You can also buy
more expensive antennas. Try,
http://www.universal-radio.com/catalog/sw_ant.html


Why would a shielded loop receive less noise than, say, a classic
wire turn loop?


Shielded loops are less sensitive to local inductive E fields.


I thought there was enough math/data out there that no one any longer
believed this.

From the W8JI page- http://www.w8ji.com/magnetic_receiving_loops.htm
"Folklore claims a small "shielded" loop antenna behaves like a
sieve, sorting "good magnetic signals" from "bad electrical noise".
Nothing is further from the truth! At relatively small distances a
small magnetic loop is more sensitive to electric fields than a small
electric field probe.


I would not be quoting some ham¹s web site as an authority on
electromagnetic theory or folklore.

There is a lot of bad information on the net. The areas of electronics
and electromagnetism are easy to misunderstand. Part of the problem is
that it is also easy to leave questions more open ended than intended
and so the answers tend to be ambiguous.

So now, I'll be more specific. Maybe it will help.

Small loops that have a shield that is split half way around are only
sensitive to magnetic fields. The split half way around ensures the E
field is canceled for far field and it works pretty well for near
inductive fields. I have used this type of probe along with small E
field probes in EMI and RFI work so I know they operate as they were
designed or I would not have been able to solve problems.

Another situation occurs when the shield is not split evenly around the
loop and grounded on one end. Here the outer shield picks up the E
field and the shielded wire picks up the M field and this configuration
will generate about two times the signal the center split shielded loop
will generate.

So it depends on a number of parameters not least of which is physical
size and electrical size for the application.

--
Telamon
Ventura, California

A Beginners Question
 

I would not be quoting some ham¹s web site as an authority on
electromagnetic theory or folklore.

You might want to Google Tom W8JI and find out who he is. To describe one of
the U.S.'s brighter engineers and designers as "some ham" is a real
disservice. The fact that he happens to have a ham license is purely a
coincidence. His explaination of how the shielded loop functions is embraced
by the IEEE group on Electromagnetics and Propagation, Roy Lewellen (writer
of EZNEC software) et al.
W4OP

A Beginners Question
 

In article ZRm6j.366$3s1.152@trnddc06,
"Dale Parfitt" wrote:


I would not be quoting some ham¹s web site as an authority on
electromagnetic theory or folklore.

You might want to Google Tom W8JI and find out who he is. To describe
one of the U.S.'s brighter engineers and designers as "some ham" is a
real disservice. The fact that he happens to have a ham license is
purely a coincidence. His explaination of how the shielded loop
functions is embraced by the IEEE group on Electromagnetics and
Propagation, Roy Lewellen (writer of EZNEC software) et al.

I don't care who Tom and Roy Lewellen are supposed to be. Credentials
don't impress me.

It's likely either they stated something incorrect or you misunderstood
them.

You asked a question and I answered it correctly. If you don't like the
answer go take it up with those two.

And by the way you will be glad to know I'm much more important than the
two of them together and yet I take the time to answer your questions.
I'm such a nice guy despite being the most important person you will
ever deal with.

Oh yeah, and your welcome Dale.

--
Telamon
Ventura, California

A Beginners Question
 

Thanks to all those who replied. I think CCrane - SW is what I'm looking
for. Will also try the Terk Pro. Thanks again.
Frank

"Frank103" wrote in message
...
I would like to buy a portable shortwave radio with a whip antenna but I've
been holding back because I live in an area that gets mediocre reception on
my Sony reciever's FM tuner from stations 20 miles away; so I'm really
paranoid about buying a portable shortwave radio. My homeowners association
doesn't permit outside antennas. Here are several questions:

1. Can someone recommend a portable shortwave radio for under $200US that
works well.?
2. Can I attach an indoor antenna to improve reception? What brand of
antenna?
3. I've tried several indoor antennas from Radio Shack to improve my FM
reception and none did anything. Can someone recommend a really powerful
FM indoor antenna?

Thanks in advance.
Frank

A Beginners Question
 

On Dec 7, 8:57 pm, "Dale Parfitt" wrote:


I would not be quoting some ham¹s web site as an authority on
electromagnetic theory or folklore.

You might want to Google Tom W8JI and find out who he is. To describe one of
the U.S.'s brighter engineers and designers as "some ham" is a real
disservice. The fact that he happens to have a ham license is purely a
coincidence. His explaination of how the shielded loop functions is embraced
by the IEEE group on Electromagnetics and Propagation, Roy Lewellen (writer
of EZNEC software) et al.
W4OP

W8JI's view, as I understand it, is that small shielded loops are no
less susceptible to local noise in virtue of their shielding, since
the shield, in his view, is part of the antenna. It's probably worth
pointing out that, even if this is true, it is still consistent with
the view that small loops pick up less noise than other types of
antennas in virtue of their directional characteristics. I guess W8JI
would then maintain that a shielded loop would be no less susceptible
to local noise than an unshielded loop, since in this case both
antennas enjoy the benefits of directionality; but he isn't commited
to denying that loops are quieter than, say whips when all things are
considered. Is this correct or am I missing something here?

A Beginners Question
 

W8JI's view, as I understand it, is that small shielded loops are no
less susceptible to local noise in virtue of their shielding, since
the shield, in his view, is part of the antenna. It's probably worth
pointing out that, even if this is true, it is still consistent with
the view that small loops pick up less noise than other types of
antennas in virtue of their directional characteristics. I guess W8JI
would then maintain that a shielded loop would be no less susceptible
to local noise than an unshielded loop, since in this case both
antennas enjoy the benefits of directionality; but he isn't commited
to denying that loops are quieter than, say whips when all things are
considered. Is this correct or am I missing something here?

Correct. Here it is from VE7SL perhaps more concisely:

Please note that a 'shielded loop' will not do anything to improve local
noise problems that any other type of loop (such as a multi-turn air core
loop) might do. Don't confuse the 'shielded' nomenclature with 'noise
shielding' as this is not the case. Like any other type of loop, it can be
used to null nearby noise sources or signals or turned to enhance desired
directions.
The shielded loop might more properly be called a 'two-turn' loop or a
'close coupled' loop as this more accurately describes it's behaviour. In
actual operation, it is the shield itself that is the active antenna
element. Signals picked up by the shield are coupled into the inner
conductor, which in turn are coupled back to the receiver via the preamp.
The loop is capable of good nulls on both groundwave and skywave signals.
The more 'balanced' the loop is (gap placed at exact center), the more
balanced the nulls will be.

A Beginners Question
 

In article CoC6j.3689$581.3625@trnddc04,
"Dale Parfitt" wrote:

W8JI's view, as I understand it, is that small shielded loops are no
less susceptible to local noise in virtue of their shielding, since
the shield, in his view, is part of the antenna. It's probably worth
pointing out that, even if this is true, it is still consistent with
the view that small loops pick up less noise than other types of
antennas in virtue of their directional characteristics. I guess W8JI
would then maintain that a shielded loop would be no less susceptible
to local noise than an unshielded loop, since in this case both
antennas enjoy the benefits of directionality; but he isn't commited
to denying that loops are quieter than, say whips when all things are
considered. Is this correct or am I missing something here?

Correct. Here it is from VE7SL perhaps more concisely:

Please note that a 'shielded loop' will not do anything to improve local
noise problems that any other type of loop (such as a multi-turn air core
loop) might do. Don't confuse the 'shielded' nomenclature with 'noise
shielding' as this is not the case. Like any other type of loop, it can be
used to null nearby noise sources or signals or turned to enhance desired
directions.
The shielded loop might more properly be called a 'two-turn' loop or a
'close coupled' loop as this more accurately describes it's behaviour. In
actual operation, it is the shield itself that is the active antenna
element. Signals picked up by the shield are coupled into the inner
conductor, which in turn are coupled back to the receiver via the preamp.
The loop is capable of good nulls on both groundwave and skywave signals.
The more 'balanced' the loop is (gap placed at exact center), the more
balanced the nulls will be.

This is wrong. I already explained why. Go back and read the part of my
post you cut out of the thread. You are being to general in the
description of shielded.

--
Telamon
Ventura, California

A Beginners Question
 

In article
,
Steve wrote:

On Dec 7, 8:57 pm, "Dale Parfitt" wrote:


I would not be quoting some ham¹s web site as an authority on
electromagnetic theory or folklore.

You might want to Google Tom W8JI and find out who he is. To describe one of
the U.S.'s brighter engineers and designers as "some ham" is a real
disservice. The fact that he happens to have a ham license is purely a
coincidence. His explaination of how the shielded loop functions is embraced
by the IEEE group on Electromagnetics and Propagation, Roy Lewellen (writer
of EZNEC software) et al.
W4OP

W8JI's view, as I understand it, is that small shielded loops are no
less susceptible to local noise in virtue of their shielding, since
the shield, in his view, is part of the antenna. It's probably worth
pointing out that, even if this is true, it is still consistent with
the view that small loops pick up less noise than other types of
antennas in virtue of their directional characteristics. I guess W8JI
would then maintain that a shielded loop would be no less susceptible
to local noise than an unshielded loop, since in this case both
antennas enjoy the benefits of directionality; but he isn't commited
to denying that loops are quieter than, say whips when all things are
considered. Is this correct or am I missing something here?


This is wrong. I already explained why. Go back and read the part of my
post Dale cut out of the thread.

--
Telamon
Ventura, California

A Beginners Question
 

This is wrong. I already explained why. Go back and read the part of my
post Dale cut out of the thread.

--
Telamon
Ventura, California

It was not my intent to cut censor your comments Telamon- I was attepmting
to clean up the thread and address Stece's question explicitely.
I respect your comments and we can agree to disagree as gentlemen.
73,
Dale