On Sep 2, 5:21*pm, "Brian Gregory [UK]" wrote:
wrote in message

...

Palomar's currently sold 9:1 transformer is good only for a longwire,
but not for T2FD.

How can that be?

--

Brian Gregory. (In the UK)

To email me remove the letter vee.

Because the presently made MLB-1 by Palomar Engineersis a UNUN for a
longwire. The older transformer which I used (may have the original
instruction paper somewhere) was a true BALUN. To build a T2FD we must
use a balun, since it is a broadband dipole.

On Sep 2, 10:41*pm, wrote:
On Sep 2, 5:21*pm, "Brian Gregory [UK]" wrote:

wrote in message

....

- - - Palomar's currently sold 9:1 transformer
- - - is good only for a longwire, but not for T2FD.

- - How can that be?

--

Brian Gregory. (In the UK)

To email me remove the letter vee.

- *Because the presently made MLB-1 by Palomar Engineersis a UNUN for
a
- longwire. The older transformer which I used (may have the original
- instruction paper somewhere) was a true BALUN. To build a T2FD we
must
- use a balun, since it is a broadband dipole.

Buy the PAR Balun which has a Floating Ground
Termainal which makes it an BAL-UN or you can
connect the Floating Ground to the Coax Ground
and have a UN-UN.
http://www.monitoringtimes.com/html/...-SWL%20Antenna

Opps to Buy the PAR Balun you have to buy
the PAR EF-SWL Antenna which includes the
http://www.grove-ent.com/ANT8.html
http://www.parelectronics.com/pdf/EF-SWL.pdf
http://www.universal-radio.com/catalog/sw_ant/2205.html
Balun and 45 Feet of HQ* Antenna Wire.
"Flex Weave" covered by a protective black
polyethylene jacket.

* 45 Feet of AWG #14 Black Polyethylene Coated
"Flex-Weave" Antenna Wire which is made up of
168 Strands of #36 Gauge Woven Copper Wires.
{This is Great Stuff}
http://www.radiobanter.com/showthread.php?t=124225

Yes with the PAR EF SWL Antenna you can Rig-It
Your Way ! - iane ~ RHF

wrote in message
...
Because the presently made MLB-1 by Palomar Engineersis a UNUN for a
longwire. The older transformer which I used (may have the original
instruction paper somewhere) was a true BALUN. To build a T2FD we must
use a balun, since it is a broadband dipole.

A long wire balun should not assume you want a common ground connection on
the input and output.

But I've look at the picture and description of the MLB-1 on the web and I
agree it's far from clear what connections are provided.

However if I bought it and found it did have the grounds joined I'd return
it as unacceptable because when using a long wire you want to use a separate
good quality earth which is not joined to your receiver's earth which may
have RF noise on it.

--

Brian Gregory. (In the UK)

To email me remove the letter vee.

Brian Gregory [UK] wrote:
wrote in message
...
Because the presently made MLB-1 by Palomar Engineersis a UNUN for a
longwire. The older transformer which I used (may have the original
instruction paper somewhere) was a true BALUN. To build a T2FD we must
use a balun, since it is a broadband dipole.

A long wire balun should not assume you want a common ground connection on
the input and output.

But I've look at the picture and description of the MLB-1 on the web and I
agree it's far from clear what connections are provided.

However if I bought it and found it did have the grounds joined I'd return
it as unacceptable because when using a long wire you want to use a separate
good quality earth which is not joined to your receiver's earth which may
have RF noise on it.


I disagree. Use on an UnUn (autotransformer) puts all points of the
system at ground, provided you ground per electrical code. "Noise" from
the radio chassis (?) flows to ground through the IEC cable. Static
charges from the antenna system flow to ground at the transmission line
point of entry.

On Sep 3, 9:15*pm, dave wrote:
Brian Gregory [UK] wrote:
*wrote in message
...
Because the presently made MLB-1 by Palomar Engineersis a UNUN for a
longwire. The older transformer which I used (may have the original
instruction paper somewhere) was a true BALUN. To build a T2FD we must
use a balun, since it is a broadband dipole.

A long wire balun should not assume you want a common ground connection on
the input and output.

But I've look at the picture and description of the MLB-1 on the web and I
agree it's far from clear what connections are provided.

However if I bought it and found it did have the grounds joined I'd return
it as unacceptable because when using a long wire you want to use a separate
good quality earth which is not joined to your receiver's earth which may
have RF noise on it.

I disagree. Use on an UnUn (autotransformer) puts all points of the
system at ground, provided you ground per electrical code. *"Noise" from
the radio chassis (?) flows to ground through the IEC cable. Static
charges from the antenna system flow to ground at the transmission line
point of entry.- Hide quoted text -

- Show quoted text -

My own cell-phone generates more noise than some of the cold war era
jammers,sometimes! That is another reason for using coax. And
grounding may bring more problems,sometimes it is better not to
ground. Static usually is not a major issue over here at my lattitude
(40* N).

wrote:

- Show quoted text -

My own cell-phone generates more noise than some of the cold war era
jammers,sometimes! That is another reason for using coax. And
grounding may bring more problems,sometimes it is better not to
ground. Static usually is not a major issue over here at my lattitude
(40* N).

GMS phones seem to get into everything. I'd look for an audio path, not
via HF radio circuitry.

Snow blowing across a wire antenna generates static electricity.
Grounding the transmission line where it enters a structure is
consistent with good operating practice. My radio floats on a 13 VDC
switch mode power supply. The only ground is the coaxial cable from the
feedthru.

dave wrote:
wrote:

- Show quoted text -

My own cell-phone generates more noise than some of the cold war era
jammers,sometimes! That is another reason for using coax. And
grounding may bring more problems,sometimes it is better not to
ground. Static usually is not a major issue over here at my lattitude
(40* N).

GMS phones seem to get into everything. I'd look for an audio path, not
via HF radio circuitry.

Snow blowing across a wire antenna generates static electricity.
Grounding the transmission line where it enters a structure is
consistent with good operating practice. My radio floats on a 13 VDC
switch mode power supply. The only ground is the coaxial cable from the
feedthru.


GSM?

"dave" wrote in message
. ..
wrote:

- Show quoted text -

My own cell-phone generates more noise than some of the cold war era
jammers,sometimes! That is another reason for using coax. And
grounding may bring more problems,sometimes it is better not to
ground. Static usually is not a major issue over here at my lattitude
(40* N).

GMS phones seem to get into everything. I'd look for an audio path, not
via HF radio circuitry.

Snow blowing across a wire antenna generates static electricity. Grounding
the transmission line where it enters a structure is consistent with good
operating practice. My radio floats on a 13 VDC switch mode power supply.
The only ground is the coaxial cable from the feedthru.

Have you tried using batteries, or even a linear power supply.
You may be amazed how much noise on the lower bands just vanishes when you
do.

--

Brian Gregory. (In the UK)

To email me remove the letter vee.

"dave" wrote in message
. ..
Brian Gregory [UK] wrote:
wrote in message
...
Because the presently made MLB-1 by Palomar Engineersis a UNUN for a
longwire. The older transformer which I used (may have the original
instruction paper somewhere) was a true BALUN. To build a T2FD we must
use a balun, since it is a broadband dipole.

A long wire balun should not assume you want a common ground connection
on
the input and output.

But I've look at the picture and description of the MLB-1 on the web and
I
agree it's far from clear what connections are provided.

However if I bought it and found it did have the grounds joined I'd
return
it as unacceptable because when using a long wire you want to use a
separate
good quality earth which is not joined to your receiver's earth which may
have RF noise on it.


I disagree. Use on an UnUn (autotransformer) puts all points of the system
at ground, provided you ground per electrical code. "Noise" from the
radio chassis (?) flows to ground through the IEC cable. Static charges
from the antenna system flow to ground at the transmission line point of
entry.

All I ccan suggest is that you try it.

If I comapre reception on the lower bands between using my own earth made
from a copper pipe hammered into the ground somewhat away from the house to
that using the mains earth I find there is way more noise using the mains
earth and using both earths is almost as bad.

--

Brian Gregory. (In the UK)

To email me remove the letter vee.

On Sep 3, 11:03*am, "Brian Gregory [UK]" wrote:
wrote in message

...

Because the presently made MLB-1 by Palomar Engineersis a UNUN for a
longwire. The older transformer which I used (may have the original
instruction paper somewhere) was a true BALUN. To build a T2FD we must
use a balun, since it is a broadband dipole.

A long wire balun should not assume you want a common ground connection on
the input and output.

But I've look at the picture and description of the MLB-1 on the web and I
agree it's far from clear what connections are provided.

However if I bought it and found it did have the grounds joined I'd return
it as unacceptable because when using a long wire you want to use a separate
good quality earth which is not joined to your receiver's earth which may
have RF noise on it.

--

Brian Gregory. (In the UK)

To email me remove the letter vee.

MLB-1 from Palomar is probably (I would rate that at 99%) their answer
to the MLB from RF Systems in the Netherlands. I still have the
latter and it has only one connection for the antenna on the top. P.S.
Just checked back Palomar's website and a true 9:1 balun kit is still
available,but it is made for transmitting up to 250W,not for SWL and
does not have any enclosure box. And it is certainly much bigger and
heavier than the old one I originally used for T2FD.