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Date
Locked Re: Air core loop

John Popelish
 

exnci2000 wrote:
Hi,
I would like to know how may microhenry corresponds to a single turn
air core loop, 1 meter diameter(conductor diameter= 1 mm).I tried many
differents software but they gives different results.
regard
Is this one of the sites you found?

I agree that it doesn't agree very closely with the approximate formula at the bottom of page 2 of:

I tend to trust sources where the formula is given, even if they calculate for me, so I can spot check their program.
Based on the second source I think the inductance of your loop is about 1.2 uH.
Locked Re: Air core loop

Jim Miller
 

loopcalc.exe gives 4.8uh

73

jim ab3cv

----- Original Message -----
From: "exnci2000" <awfhgm@...>
To: <loopantennas@...>
Sent: Monday, March 05, 2007 1:04 PM
Subject: [loopantennas] Air core loop


Hi,
I would like to know how may microhenry corresponds to a single turn
air core loop, 1 meter diameter(conductor diameter= 1 mm).I tried many
differents software but they gives different results.
regard
Franco.-




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1:58 PM
Locked Air core loop

 

Hi,
I would like to know the correct value, in microhenry, of a single
turn air core loop 1 meter diameter (conductor 1 mm ).I tried many
software but they give me different results.
Regards
Franco.-
Locked Re: AOR LA350 Loop Antenna

 

Hello all

The AOR LA350 Loop Antenna is still for sale, is any one still interested in buying it.

Thanks

Andrew.

----- Original Message -----
From: Fraser
To: loopantennas@...
Sent: Thursday, February 15, 2007 12:40 PM
Subject: [loopantennas] Re: AOR LA350 Loop Antenna


Hi Andrew,

I had this problem when selling a Lowe PR-150.

I had people saying they would outbid all others.

I decided the fairest option was to set a price and offer the unit
to the first person who contacted me. He was happy to pay the price
and I was happy to sell so it seemed fair.

Alternatively you could put it on eB*y

Fraser (an interested party)

--- In loopantennas@..., "Andrew Lincoln"
<andrew.lincoln2@...> wrote:
>
> Hello
>
> To those that are interested in buying the AOL LA350 Loop Antenna,
at the moment there are 3 people interested, how can I fairly decide
which one to sell it to, any suggestions ?
>
> Thanks
>
> Andrew.
> ----- Original Message -----
> From: Fraser
> To: loopantennas@...
> Sent: Wednesday, February 14, 2007 11:42 AM
> Subject: [loopantennas] Re: AOR LA350 Loop Antenna
>
>
> Hi Andrew,
>
> I tried sendoin a PM but it failed so sorry to the Group for
posting
> this reply here.
>
> I have a PayPal account and no problen with postage costs.
>
> I live in Milton Keynes.
>
> Fraser
>
> --- In loopantennas@..., "Andrew Lincoln"
> <andrew.lincoln2@> wrote:
> >
> > Hello
> >
> > Do you and the other people interested in buying the AOR LA350
Loop
> Antenna have a PayPal Account, if not it is easy to register and
it's
> free. Web address
> > www.paypal.com
> >
> > One other thing postage would be extra and if required can be
> registered post or recorded delivery I think it's called.
Hopefully
> this won't cost much.
> > Where do you live, I live in Letchworth Hertfordshire.
> >
> > Thanks
> >
> > Andrew.
> > ----- Original Message -----
> > From: Fraser
> > To: loopantennas@...
> > Sent: Tuesday, February 13, 2007 11:06 PM
> > Subject: [loopantennas] Re: AOR LA350 Loop Antenna
> >
> >
> >
> > Hi Andrew,
> >
> > If you do decide to sell, I should be grateful for first
refusal
> on
> > it.
> >
> > Cheers
> >
> > Fraser
> >
> > --- In loopantennas@..., "aandrewb2001"
> > <andrew.lincoln2@> wrote:
> > >
> > > Hello all
> > >
> > > I have a AOR LA350 Loop Antenna that I might be selling.
> > > It is in mint condition, not sure if I have still got the
> manual or
> > not
> > > but have got the box.
> > > Comes with two loops and power adapter.
> > > I would like ?70.00 for it if I decide to sell, is that
> reasonable?
> > >
> > > Thanks
> > >
> > > Andrew.
> > >
> >
> >
> >
> >
> >
> > [Non-text portions of this message have been removed]
> >
>
>
>
>
>
> [Non-text portions of this message have been removed]
>





[Non-text portions of this message have been removed]
Locked Re: Active loop antenna

jr_dakota
 

A FET might be alright, definitely the ticket on short whip with a
high impedance .... I'm not sure what the impedances look like on a
(relatively) short untuned loop, I tried to measure one with my AMQRP
Antenna Analyst but I have way too much metal (heat ducts, pipes, etc)
in my basement to get an accurate reading so I need to wait a few more
weeks for the weather to warm up so I can take it outside in the free
and clear and get some measurements

I will say this though, expect a Wellbrook clone from me by the end of
April using a push-pull pair of 2N5109s (or similar) and perhaps a
pair of FETS depending on the impedances or the need for more gain

JR


--- In loopantennas@..., "Keith Browning" <kbrowning@...>
wrote:

How about a plain old FET to lower the loading?
Keith
----- Original Message -----
From: "jr_dakota" <SG2112@...>
To: <loopantennas@...>
Sent: Friday, March 02, 2007 10:09 AM
Subject: [loopantennas] Re: Active loop antenna


You need strict 50 ohm input and output impedances for these MMICs to
work properly which is kind of hard to do with the first amplifier on
a broadband antenna ... On a tuned loop with a small pickup loop it
would probably be alright but a plain ol' RF transistor would work as
well or better

You also have to be real careful applying a 1 Ghz amplifier for use in
the HF range because they have a tendency to 'go off' (Oscillate) in
the VHF range where you can't hear (And most people can;t see on their
scope) the result in the receiver but other than it's not working
right (Little or no gain, front end blocking, etc)

Personally I don't like to use them other than in transmitting amps
for the HF range, when you start getting into 2 Meters and up though
they are hard to beat because you can get decent gain and IP3 without
tuned circuits where the difference between a 2 1/2 turn inductor and
a 3 turn inductor can be several Mhz
JR

--- In loopantennas@..., "exnci2000" <awfhgm@> wrote:

Hi,
On minicircuits.com catalog,there are some interesting mololithic Rf
amplifier ERA/MAR series offering good IP3.I would like to know if you
have some schematich diagram to homebrew an active broadband loop
antenna from 100 Khz to 30 Mhz !!
Best regards
Franco
Italy.-




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Post files here. If the file comes from a website, please put it in
the Links rather than uploading
the file.


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and GIF into Photos. Please
convert BMP or TIF to JPG or GIF before uploading.


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__________ NOD32 2087 (20070301) Information __________

This message was checked by NOD32 antivirus system.
Locked Re: AOR LA350 Loop Antenna

[email protected]
 

Hi Andrew

I'm still interested

regards

Nigel
GM8PZR
Locked Re: Active loop antenna

Ralph Lane
 

My email address is Rlane7301@...

Ralph

----- Original Message -----
From: "Fraser" <fraser.castle@...>
To: <loopantennas@...>
Sent: Friday, March 02, 2007 6:14 PM
Subject: [loopantennas] Re: Active loop antenna


Hi Ralph,

You will need to PM me your email address.

Fraser


--- In loopantennas@..., "Ralph Lane" <rlane7301@...> wrote:

Hi, add me to the list for the Loop antenna schematic.

Ralph



If you've got links, post them in the Links section!


Post files here. If the file comes from a website, please put it in the Links rather than uploading the file.


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Yahoo! Groups Links
Locked Re: Active loop antenna

Fraser
 

Hi Ralph,

You will need to PM me your email address.

Fraser

--- In loopantennas@..., "Ralph Lane" <rlane7301@...> wrote:

Hi, add me to the list for the Loop antenna schematic.

Ralph
Locked Re: Active loop antenna

Ralph Lane
 

Hi, add me to the list for the Loop antenna schematic.

Ralph

----- Original Message -----
From: "Fraser" <fraser.castle@...>
To: <loopantennas@...>
Sent: Friday, March 02, 2007 11:55 AM
Subject: [loopantennas] Re: Active loop antenna


Rob,

Email me and I'll add you to the list of email recipients for the
schematic.

Fraser

--- In loopantennas@..., "Rob Moore" <rmoore5@...> wrote:

Hi,

I'd like a copy of the WL500 schematic! It will save me a lot of
trouble tracing through the wiring and PC board.

Regards,
Rob


--- In loopantennas@..., "Fraser" <fraser.castle@>
wrote:

Hi Franco,

The AOR WL500 uses a MAR6 MMIC from Minicircuits as it's RF
amplifier.

The WL500 is varacap diode tuned and uses "bulk inductance" in
the form
of two switched fixed inductors to bring the 2 turn loop to
resonance
at the required frequency.

I was VERY surprised to see the MAR6 attched directlt to the
output of
the tuned loop as it is a 50 ohm inout and output device. I would
never
have used such a device in a tuned loop design myself. AOR made
it work
though and the WL500 was apparently a pretty decent tuned HF
Loop. It
is now discontinued.

I do have the schematic of the AOR WL500 if you need it but the
two
fixed loop inductors are not detailed either in type or
inductance
value so some experimentation may be required.

You could do worse tan buy a Degen DE31MS as they are so cheap
from
China via eB*y. You could then experiment with that design to
improve
it if required.

PM me you email address if you want the schematic.

Regards

Fraser

--- In loopantennas@..., "exnci2000" <awfhgm@> wrote:

Hi,
On minicircuits.com catalog,there are some interesting
mololithic Rf
amplifier ERA/MAR series offering good IP3.I would like to know
if you
have some schematich diagram to homebrew an active broadband
loop
antenna from 100 Khz to 30 Mhz !!
Best regards
Franco
Italy.-




If you've got links, post them in the Links section!


Post files here. If the file comes from a website, please put it in the Links rather than uploading the file.


You can now view images at higher resolution in Photos. Upload JPG and GIF into Photos. Please convert BMP or TIF to JPG or GIF before uploading.


And please trim all this when replying!
Yahoo! Groups Links
Locked Re: Active loop antenna

Fraser
 

Rob,

Email me and I'll add you to the list of email recipients for the
schematic.

Fraser

--- In loopantennas@..., "Rob Moore" <rmoore5@...> wrote:

Hi,

I'd like a copy of the WL500 schematic! It will save me a lot of
trouble tracing through the wiring and PC board.

Regards,
Rob


--- In loopantennas@..., "Fraser" <fraser.castle@>
wrote:

Hi Franco,

The AOR WL500 uses a MAR6 MMIC from Minicircuits as it's RF
amplifier.

The WL500 is varacap diode tuned and uses "bulk inductance" in
the form
of two switched fixed inductors to bring the 2 turn loop to
resonance
at the required frequency.

I was VERY surprised to see the MAR6 attched directlt to the
output of
the tuned loop as it is a 50 ohm inout and output device. I would
never
have used such a device in a tuned loop design myself. AOR made
it work
though and the WL500 was apparently a pretty decent tuned HF
Loop. It
is now discontinued.

I do have the schematic of the AOR WL500 if you need it but the
two
fixed loop inductors are not detailed either in type or
inductance
value so some experimentation may be required.

You could do worse tan buy a Degen DE31MS as they are so cheap
from
China via eB*y. You could then experiment with that design to
improve
it if required.

PM me you email address if you want the schematic.

Regards

Fraser

--- In loopantennas@..., "exnci2000" <awfhgm@> wrote:

Hi,
On minicircuits.com catalog,there are some interesting
mololithic Rf
amplifier ERA/MAR series offering good IP3.I would like to know
if you
have some schematich diagram to homebrew an active broadband
loop
antenna from 100 Khz to 30 Mhz !!
Best regards
Franco
Italy.-
Locked Re: Active loop antenna

Rob Moore
 

Hi,

I'd like a copy of the WL500 schematic! It will save me a lot of
trouble tracing through the wiring and PC board.

Regards,
Rob

--- In loopantennas@..., "Fraser" <fraser.castle@...> wrote:

Hi Franco,

The AOR WL500 uses a MAR6 MMIC from Minicircuits as it's RF amplifier.

The WL500 is varacap diode tuned and uses "bulk inductance" in the form
of two switched fixed inductors to bring the 2 turn loop to resonance
at the required frequency.

I was VERY surprised to see the MAR6 attched directlt to the output of
the tuned loop as it is a 50 ohm inout and output device. I would never
have used such a device in a tuned loop design myself. AOR made it work
though and the WL500 was apparently a pretty decent tuned HF Loop. It
is now discontinued.

I do have the schematic of the AOR WL500 if you need it but the two
fixed loop inductors are not detailed either in type or inductance
value so some experimentation may be required.

You could do worse tan buy a Degen DE31MS as they are so cheap from
China via eB*y. You could then experiment with that design to improve
it if required.

PM me you email address if you want the schematic.

Regards

Fraser

--- In loopantennas@..., "exnci2000" <awfhgm@> wrote:

Hi,
On minicircuits.com catalog,there are some interesting mololithic Rf
amplifier ERA/MAR series offering good IP3.I would like to know if you
have some schematich diagram to homebrew an active broadband loop
antenna from 100 Khz to 30 Mhz !!
Best regards
Franco
Italy.-
Locked Re: Active loop antenna

Fraser
 

Hi Franco,

The AOR WL500 uses a MAR6 MMIC from Minicircuits as it's RF amplifier.

The WL500 is varacap diode tuned and uses "bulk inductance" in the form
of two switched fixed inductors to bring the 2 turn loop to resonance
at the required frequency.

I was VERY surprised to see the MAR6 attched directlt to the output of
the tuned loop as it is a 50 ohm inout and output device. I would never
have used such a device in a tuned loop design myself. AOR made it work
though and the WL500 was apparently a pretty decent tuned HF Loop. It
is now discontinued.

I do have the schematic of the AOR WL500 if you need it but the two
fixed loop inductors are not detailed either in type or inductance
value so some experimentation may be required.

You could do worse tan buy a Degen DE31MS as they are so cheap from
China via eB*y. You could then experiment with that design to improve
it if required.

PM me you email address if you want the schematic.

Regards

Fraser

--- In loopantennas@..., "exnci2000" <awfhgm@...> wrote:

Hi,
On minicircuits.com catalog,there are some interesting mololithic Rf
amplifier ERA/MAR series offering good IP3.I would like to know if you
have some schematich diagram to homebrew an active broadband loop
antenna from 100 Khz to 30 Mhz !!
Best regards
Franco
Italy.-
Locked Re: Active loop antenna

Keith Browning
 

How about a plain old FET to lower the loading?
Keith

----- Original Message -----
From: "jr_dakota" <SG2112@...>
To: <loopantennas@...>
Sent: Friday, March 02, 2007 10:09 AM
Subject: [loopantennas] Re: Active loop antenna


You need strict 50 ohm input and output impedances for these MMICs to
work properly which is kind of hard to do with the first amplifier on
a broadband antenna ... On a tuned loop with a small pickup loop it
would probably be alright but a plain ol' RF transistor would work as
well or better

You also have to be real careful applying a 1 Ghz amplifier for use in
the HF range because they have a tendency to 'go off' (Oscillate) in
the VHF range where you can't hear (And most people can;t see on their
scope) the result in the receiver but other than it's not working
right (Little or no gain, front end blocking, etc)

Personally I don't like to use them other than in transmitting amps
for the HF range, when you start getting into 2 Meters and up though
they are hard to beat because you can get decent gain and IP3 without
tuned circuits where the difference between a 2 1/2 turn inductor and
a 3 turn inductor can be several Mhz
JR

--- In loopantennas@..., "exnci2000" <awfhgm@...> wrote:

Hi,
On minicircuits.com catalog,there are some interesting mololithic Rf
amplifier ERA/MAR series offering good IP3.I would like to know if you
have some schematich diagram to homebrew an active broadband loop
antenna from 100 Khz to 30 Mhz !!
Best regards
Franco
Italy.-




If you've got links, post them in the Links section!


Post files here. If the file comes from a website, please put it in the Links rather than uploading
the file.


You can now view images at higher resolution in Photos. Upload JPG and GIF into Photos. Please
convert BMP or TIF to JPG or GIF before uploading.


And please trim all this when replying!
Yahoo! Groups Links





__________ NOD32 2087 (20070301) Information __________

This message was checked by NOD32 antivirus system.
Locked Re: Active loop antenna

jr_dakota
 

You need strict 50 ohm input and output impedances for these MMICs to
work properly which is kind of hard to do with the first amplifier on
a broadband antenna ... On a tuned loop with a small pickup loop it
would probably be alright but a plain ol' RF transistor would work as
well or better

You also have to be real careful applying a 1 Ghz amplifier for use in
the HF range because they have a tendency to 'go off' (Oscillate) in
the VHF range where you can't hear (And most people can;t see on their
scope) the result in the receiver but other than it's not working
right (Little or no gain, front end blocking, etc)

Personally I don't like to use them other than in transmitting amps
for the HF range, when you start getting into 2 Meters and up though
they are hard to beat because you can get decent gain and IP3 without
tuned circuits where the difference between a 2 1/2 turn inductor and
a 3 turn inductor can be several Mhz
JR

--- In loopantennas@..., "exnci2000" <awfhgm@...> wrote:

Hi,
On minicircuits.com catalog,there are some interesting mololithic Rf
amplifier ERA/MAR series offering good IP3.I would like to know if you
have some schematich diagram to homebrew an active broadband loop
antenna from 100 Khz to 30 Mhz !!
Best regards
Franco
Italy.-
Locked Re: Loop supports

Richards
 

Oh No...I believe antennas put up in lousy
weather last longer.

Just my take... ////// Richards //////
===============================================

Bob B. wrote:
Now all I need is warmer

weather.
Locked Active loop antenna

 

Hi,
On minicircuits.com catalog,there are some interesting mololithic Rf
amplifier ERA/MAR series offering good IP3.I would like to know if you
have some schematich diagram to homebrew an active broadband loop
antenna from 100 Khz to 30 Mhz !!
Best regards
Franco
Italy.-
Locked Re: Is anybody there....

larry allen
 

Its hovering around zero degree C here in Toronto, Ontario
Larry ve3fxq

----- Original Message -----
From: "Rob Moore" <rmoore5@...>
To: <loopantennas@...>
Sent: Tuesday, February 27, 2007 5:37 PM
Subject: [loopantennas] Re: Is anybody there....


Rub it in! It's about 55 degrees here and rainy in San Jose.

--- In loopantennas@..., Steve Baker <mcqueen_34@...> wrote:

Sorry wasn't paying attention. I was out laying by the
pool. 75 degrees here in Phoenix!

Steve B.

Well I'm glad the group is stil active! It sounds
like everyone is playing with different things or
freezing in the winter weather!





____________________________________________________________________________________
Do you Yahoo!?
Everyone is raving about the all-new Yahoo! Mail beta.
Locked Re: Super Loop 40/80m

willmcray
 

Thanks for the input. I don't have the lot size or supports to get
the loop any higher then what I have which is 30 ft at the highest
point. The apex is pointed down and at about 6 foot off the
ground. The antenna works great positioned as is, just courious
what I would gain by going horiziontal with it at say 25 feet. From
what I understand it is a bit directional moounted verticial. I
guess all I can do is try. Every instalation is different and I
need to try and see what works best for my location.

73,
Will
W6AAV


--- In loopantennas@..., Jim Dunstan <jdunstan@...>
wrote:

At 06:15 AM 2/28/2007 +1300, you wrote:

What is a sky wire ?
278 feet is around a full wavelength
Keith

----- Original Message -----
From: "willmcray" <<mailto:w6aav%40comcast.net>w6aav@...>
To: <<mailto:loopantennas%
40yahoogroups.com>loopantennas@...>
Sent: Tuesday, February 27, 2007 2:52 PM
Subject: [loopantennas] Super Loop 40/80m

I just built a super loop antenna for 80/40. It also works well
on 10-
20. I have it vertically polorized. I have heard that positioning
it
horziontal will provide better performance. Has anyone out here
with
experience with this antenna. I thought of building a skywire for
80m,
but I can't support 278 feet of wire. Currently I have 218 ft and
I
can work with that as the very most.

Any help would be helpful.

Will
W6AAV

Hi,

'Sky Wire' is a euphemism for an antenna system with lots of wire
arranged
in one way or another in a loop arrangement .... in early days
they were
generally arranged in a vertical configuration while more recently
the
horizontal arrangement is popular. If designed to be naturally
resonant at
a particular band they are 1 wavelength in circumference and can
be fed
with a coax feed line. If not resonant, or more than 1 wavelength
they are
generally used multiband. In this case they are fed with balanced
open
wire feed line and tuned with an antenna tuner. Performance is
generally
unpredictable and mostly a necdotal.

I know that a 1 wavelength loop that is vertically oriented with
the center
at least 1/2 wavelength above ground is a 'hot' performer. I
have had
mixed results with the 'lots of wire' horizontal 'Sky Wire'
approach. Height above ground beats mult-wavelengths every time.

Jim


[Non-text portions of this message have been removed]
Locked Re: Is anybody there....

Rob Moore
 

Rub it in! It's about 55 degrees here and rainy in San Jose.

--- In loopantennas@..., Steve Baker <mcqueen_34@...> wrote:

Sorry wasn't paying attention. I was out laying by the
pool. 75 degrees here in Phoenix!

Steve B.

Well I'm glad the group is stil active! It sounds
like everyone is playing with different things or
freezing in the winter weather!





____________________________________________________________________________________
Do you Yahoo!?
Everyone is raving about the all-new Yahoo! Mail beta.
Locked Re: Is anybody there....

Steve Baker
 

Sorry wasn't paying attention. I was out laying by the
pool. 75 degrees here in Phoenix!

Steve B.

Well I'm glad the group is stil active! It sounds
like everyone is playing with different things or
freezing in the winter weather!





____________________________________________________________________________________
Do you Yahoo!?
Everyone is raving about the all-new Yahoo! Mail beta.
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