More Amrad notes
 

I mentioned that I would post a comparison between Amrad and PA0RDT
and maybe loop too. I just want to say project has been delayed. I've
got Amrad mounted in a quiet corner of the lot with a good ground. I
ordered some nice coax today for the PA0RDT so I should be up and
running in a few days. From what (very limited) testing I've done so
far the Amrad does a nice job of pulling them in. I did hear the
local 1180am station way down the band so I will have to check that
out. Plenty of beacons and MW stations in there, but I wouldn't be
surprised if the MW loop outperforms in BC band. Overall I'm
impressed with the performance as it is good for everywhere I listen.
I used a 3 foot piece of 3/16" brazing rod with a 2' piece of 1/16"
brazing rod attached on top.

more later,
NEO

More Amrad notes
 

On Nov 28, 9:51 pm, N9NEO wrote:
I mentioned that I would post a comparison between Amrad and PA0RDT
and maybe loop too. I just want to say project has been delayed. I've
got Amrad mounted in a quiet corner of the lot with a good ground. I
ordered some nice coax today for the PA0RDT so I should be up and
running in a few days. From what (very limited) testing I've done so
far the Amrad does a nice job of pulling them in. I did hear the
local 1180am station way down the band so I will have to check that
out. Plenty of beacons and MW stations in there, but I wouldn't be
surprised if the MW loop outperforms in BC band. Overall I'm
impressed with the performance as it is good for everywhere I listen.
I used a 3 foot piece of 3/16" brazing rod with a 2' piece of 1/16"
brazing rod attached on top.

more later,
NEO

I hope you have better luck with the PA0RDT than I did. Some people
have had extremely positive experiences with them. My guess is that
it's just not up to the kind of noise I have to cope with here in the
NYC metropolitan area. In a quiet location it would do much
better...or so I suspect. Mine is now functioning as a 'noise' antenna.

More Amrad notes
 

On Nov 28, 9:51 pm, N9NEO wrote:
I mentioned that I would post a comparison between Amrad and PA0RDT
and maybe loop too. I just want to say project has been delayed. I've
got Amrad mounted in a quiet corner of the lot with a good ground. I
ordered some nice coax today for the PA0RDT so I should be up and
running in a few days. From what (very limited) testing I've done so
far the Amrad does a nice job of pulling them in. I did hear the
local 1180am station way down the band so I will have to check that
out. Plenty of beacons and MW stations in there, but I wouldn't be
surprised if the MW loop outperforms in BC band. Overall I'm
impressed with the performance as it is good for everywhere I listen.
I used a 3 foot piece of 3/16" brazing rod with a 2' piece of 1/16"
brazing rod attached on top.

more later,
NEO

Visit the Kongsford web site and look at "The Dallas Files"
The Amrad was derived Dallas Lankffords works.
There are several udated variations that work much better then the
Amrad.

http://www.kongsfjord.no/dl/dl.htm

The dipole versions are nice because they can be rotated to null
noise,
or peak a signal.

If an active dipole dipole is mounted so the center can swivel and
allow the
antenna to rotate, you can rapidly check the effects of polarization
of a
signal. And see how the SN ratio changes.


For a derivative of the PA0RDT antenna that works very well
http://www.kongsfjord.no/dl/Antennas...0Complementary
%20Push-Pull%20Output%20Active%20Whip%20Antennas.pdf

I still have trouble accepting that a micro antenna acutely works!

Terry

More Amrad notes
 

In article ,
**THE-RFI-EMI-GUY** wrote:

In article
,
Steve wrote:

On Nov 28, 9:51 pm, N9NEO wrote:


I mentioned that I would post a comparison between Amrad and PA0RDT
and maybe loop too. I just want to say project has been delayed.
I've got Amrad mounted in a quiet corner of the lot with a good
ground. I ordered some nice coax today for the PA0RDT so I should
be up and running in a few days. From what (very limited) testing
I've done so far the Amrad does a nice job of pulling them in. I
did hear the local 1180am station way down the band so I will have
to check that out. Plenty of beacons and MW stations in there,
but I wouldn't be surprised if the MW loop outperforms in BC band.
Overall I'm impressed with the performance as it is good for
everywhere I listen. I used a 3 foot piece of 3/16" brazing rod
with a 2' piece of 1/16" brazing rod attached on top.

more later, NEO



I hope you have better luck with the PA0RDT than I did. Some people
have had extremely positive experiences with them. My guess is that
it's just not up to the kind of noise I have to cope with here in
the NYC metropolitan area. In a quiet location it would do much
better...or so I suspect. Mine is now functioning as a 'noise'
antenna.


Could it be that VHF and UHF commercial carriers are desensitizing
the amp?

He got plenty of in band noise to do that.

--
Telamon
Ventura, California

PA0RDT 'Micro' Active Antenna - What Is It ? -and- How To Install ItBetter !
 

On Nov 29, 4:10 am, wrote:
On Nov 28, 9:51 pm, N9NEO wrote:

I mentioned that I would post a comparison between Amrad and PA0RDT
and maybe loop too. I just want to say project has been delayed. I've
got Amrad mounted in a quiet corner of the lot with a good ground. I
ordered some nice coax today for the PA0RDT so I should be up and
running in a few days. From what (very limited) testing I've done so
far the Amrad does a nice job of pulling them in. I did hear the
local 1180am station way down the band so I will have to check that
out. Plenty of beacons and MW stations in there, but I wouldn't be
surprised if the MW loop outperforms in BC band. Overall I'm
impressed with the performance as it is good for everywhere I listen.
I used a 3 foot piece of 3/16" brazing rod with a 2' piece of 1/16"
brazing rod attached on top.

more later,
NEO

Visit the Kongsford web site and look at "The Dallas Files"
The Amrad was derived Dallas Lankffords works.
There are several udated variations that work much better then the
Amrad.

http://www.kongsfjord.no/dl/dl.htm

The dipole versions are nice because they can be rotated to null
noise,
or peak a signal.

If an active dipole dipole is mounted so the center can swivel and
allow the
antenna to rotate, you can rapidly check the effects of polarization
of a
signal. And see how the SN ratio changes.

For a derivative of the PA0RDT antenna that works very well
http://www.kongsfjord.no/dl/Antennas...0Complementary
%20Push-Pull%20Output%20Active%20Whip%20Antennas.pdf

I still have trouble accepting that a micro antenna acutely works!

Terry

Terry,

PA0RDT 'Micro' Active Antenna - What Is It ?
-and- How To Install It Better !

Some 'claim' that the Coax Cable used with the PA0RDT
'Micro' Active Antenna functions in a Dual-Mode with
the Active Antenna Element acting as a Far-End-Fed
Terminator for the Coax Cable {Antenna Element}.
* Mode-One 'Feed-in-Line' Receiver -out-to- End-of-Coax.
* Mode-Two 'Active-Antenna' End-of-Coax -back-to- Receiver

NOTE - If this is True then for the PA0RDT 'Micro'
Active Antenna to be more 'effective' it must be both
Remote-and-Isolated" as an Active Antenna Element.

1 - Remote Mounting Location for the PA0RDT 'Micro'
Active Antenna.
-Note- As Far from the House and Sources of Noise as
practicle and possible.

2 - Ground Rod and 1:1 Insolation {Coupling} Transfromer
at "The Base" of the Remote Mounting Location.
-Note- Power Injector is located here too; along with
DC Power to this location.

3 - Coax Cable 'Up-Line' from the Ground/Isolation
to the PA0RDT 'Micro' Active Antenna.
-Note- Free Standing 21 Foot piece of Top-Rail.

4 - Coax Cable feed-in-line from the Receiver to "The Base"
Ground/Isolation Point of the Remote Mounting Location.
-Note- Several Ferrite Beads along this piece of Coax
Cable and the DC Power Line.
+Plus+ 'Bury' the Coax Cable and DC Power Line -if- possible.

TIP - The Black PVC Half-Inch (1/2") Sprinkler Distribution
Tubing can be used as an 'Extra' Outer Cover for 'Buried'
Coax Cable that is placed along the Ground or only a 4"~6"
under the Ground. Use the Lawn Staples -if- the Tubing
is placed On-the-Ground.

plan before you build - iane ~ RHF

PA0RDT 'Micro' Active Antenna - What Is It ? -and- How To InstallIt Better !
 

On Nov 30, 11:14 pm, RHF wrote:
On Nov 29, 4:10 am, wrote:



On Nov 28, 9:51 pm, N9NEO wrote:

I mentioned that I would post a comparison between Amrad and PA0RDT
and maybe loop too. I just want to say project has been delayed. I've
got Amrad mounted in a quiet corner of the lot with a good ground. I
ordered some nice coax today for the PA0RDT so I should be up and
running in a few days. From what (very limited) testing I've done so
far the Amrad does a nice job of pulling them in. I did hear the
local 1180am station way down the band so I will have to check that
out. Plenty of beacons and MW stations in there, but I wouldn't be
surprised if the MW loop outperforms in BC band. Overall I'm
impressed with the performance as it is good for everywhere I listen.
I used a 3 foot piece of 3/16" brazing rod with a 2' piece of 1/16"
brazing rod attached on top.

more later,
NEO

Visit the Kongsford web site and look at "The Dallas Files"
The Amrad was derived Dallas Lankffords works.
There are several udated variations that work much better then the
Amrad.

http://www.kongsfjord.no/dl/dl.htm

The dipole versions are nice because they can be rotated to null
noise,
or peak a signal.

If an active dipole dipole is mounted so the center can swivel and
allow the
antenna to rotate, you can rapidly check the effects of polarization
of a
signal. And see how the SN ratio changes.

For a derivative of the PA0RDT antenna that works very well
http://www.kongsfjord.no/dl/Antennas...0Complementary
%20Push-Pull%20Output%20Active%20Whip%20Antennas.pdf

I still have trouble accepting that a micro antenna acutely works!

Terry

Terry,

PA0RDT 'Micro' Active Antenna - What Is It ?
-and- How To Install It Better !

Some 'claim' that the Coax Cable used with the PA0RDT
'Micro' Active Antenna functions in a Dual-Mode with
the Active Antenna Element acting as a Far-End-Fed
Terminator for the Coax Cable {Antenna Element}.
* Mode-One 'Feed-in-Line' Receiver -out-to- End-of-Coax.
* Mode-Two 'Active-Antenna' End-of-Coax -back-to- Receiver

NOTE - If this is True then for the PA0RDT 'Micro'
Active Antenna to be more 'effective' it must be both
Remote-and-Isolated" as an Active Antenna Element.

1 - Remote Mounting Location for the PA0RDT 'Micro'
Active Antenna.
-Note- As Far from the House and Sources of Noise as
practicle and possible.

2 - Ground Rod and 1:1 Insolation {Coupling} Transfromer
at "The Base" of the Remote Mounting Location.
-Note- Power Injector is located here too; along with
DC Power to this location.

3 - Coax Cable 'Up-Line' from the Ground/Isolation
to the PA0RDT 'Micro' Active Antenna.
-Note- Free Standing 21 Foot piece of Top-Rail.

4 - Coax Cable feed-in-line from the Receiver to "The Base"
Ground/Isolation Point of the Remote Mounting Location.
-Note- Several Ferrite Beads along this piece of Coax
Cable and the DC Power Line.
+Plus+ 'Bury' the Coax Cable and DC Power Line -if- possible.

TIP - The Black PVC Half-Inch (1/2") Sprinkler Distribution
Tubing can be used as an 'Extra' Outer Cover for 'Buried'
Coax Cable that is placed along the Ground or only a 4"~6"
under the Ground. Use the Lawn Staples -if- the Tubing
is placed On-the-Ground.

plan before you build - iane ~ RHF
.

And be sure to add as many ferrite chokes as you can afford!

John Brynt's "Is your Feedline and antenna" shows an effective
way to use amiden cores and RG174. While he is trying to supress
the "transfer impedance" aspects in coax cable, it is also a very
effective way to tame common mode noise.

Pulse transformer has an application note that uses a center taped
inductor with the center tap grounded to attenuate common mode noise.
I can't find the link right now, but using a center tap 1:1 or 2:1
transformer
to match balanced line to the home simply kills common mode.

For logistics reasons I have retreated to coax. Our metal roof would
be
very difficult to use a balanced feed line. I had 3 NMO connectors
mounted
on the roof line peak with low loss coax routed under the insulation.
Other
then the requirement to impose on friends to climb up to change
antennas,
it is great. No feed lines suspended 5' off the ground to get snagged
by the
lawn kid.

I think this is the link www.pulseeng.com/products/datasheets/
G019.pdf.
If not hunt around their web page.

Terry