The specs on the HAM baluns don't go into the AM BCB .Of course, that
doesn't mean they won't work, but how well they would work is the
question.

Incidentally, the Wellbrook ALA-100 works as low as 24Khz. There are
two data signals out of Washington state, approx 24khz and 44khz, that
I can pick up with about 40ft on the ALA100. I think the spec limit is
150Khz, so performance is probably less than optimal. Of course, there
is nothing really there to receive beneath 150Khz, though there are
signals to detect.


David wrote:
On 7 Feb 2006 19:17:39 -0800, wrote:

It would help to know the exact model, but from what I could see from
the website, this is similar to the Palomar end-feed baluns, though you
can transmit on the Par Electronics version. The performance should be
similar to a long wire, but more efficient since the transformer will
improve the match.

Since you are not transmitting, more wire will probably improve the low
end reception, though most of those ham baluns don't work well in the
AM BCB or lower.

The Par web site says they are receive only.

Why would a ''ham balun'' not work for Medium Wave?

In article . com,
"junius" wrote:

Hello folks,

I have a question here... I recently bought one of these excellent Par
Electronic EF-SWL antennas.

As the supplied radiator can be disconnected and another wire be hooked
onto the 9:1 transformer, I was thinking to give a go at hooking up a
150 foot length of wire that I have on hand. My question is this: in
hooking up an alternate wire to the transformer, would the antenna lose
its characteristics as a 1-30 MHz antenna? Would an antenna tuner then
be required?

Very curious for info on this. I'm afraid I don't know too terribly
much about antenna theory.

Thanks in advance for any help provided,

Just give it a try and see if it works well for you.

The impedance of the wire is determined by its diameter and height above
ground not the length. The 9:1 UNUN is a good choice.

--
Telamon
Ventura, California

"Telamon" wrote in message
...
In article . com,
"junius" wrote:

Hello folks,

I have a question here... I recently bought one of these excellent Par
Electronic EF-SWL antennas.

As the supplied radiator can be disconnected and another wire be hooked
onto the 9:1 transformer, I was thinking to give a go at hooking up a
150 foot length of wire that I have on hand. My question is this: in
hooking up an alternate wire to the transformer, would the antenna lose
its characteristics as a 1-30 MHz antenna? Would an antenna tuner then
be required?

Very curious for info on this. I'm afraid I don't know too terribly
much about antenna theory.

Thanks in advance for any help provided,

Just give it a try and see if it works well for you.

The impedance of the wire is determined by its diameter and height above
ground not the length. The 9:1 UNUN is a good choice.

--
Telamon
Ventura, California

Hi Junius et al,

There is no magic about the 45' length. It is a nice tradeoff between
performance and ease of deployment. The military also had a bit of a say so.
Anyway, the transformer looks good to well below MW, so that is not an
issue.
The longer length, as one poster suggested, will improve MW performance. If
the antenna is high (in terms of wavelength) a number of nulls (in addition
to multiple gain lobes) will be seen at HF. Neither is very useful as the
antenna cannot be rotated.
Some receivers may overload with the increased signal strength from MW.

One of ther nice features of this antenna is the fact that both secondary
( antenna side) and primary ( coaxial feed side) grounds are separately
available on 10-32 stainless studs at the matchbox. They come supplied from
us with the two grounds strapped together. This may or may not be the
optimum configuration for your location and noise sources- experimenting
with the grounding, as detailed in the manual may make a much bigger
difference in S/N than increasing the wire length.

GL,

Dale W4OP
for PAR Electronics, Inc.

Junius,

1 - Question - Why Not a Windom Antenna
instead of a . . . long, Long. LONG Wire ?

Windom Antenna :

Ensure that the Shorting Strap is between the Two
Ground Terminals of the Par EF-SWL Antenna.
[ Antenna Ground and Coax Cable Ground ]

Lay-Out the 150 Foot of Antenna Wire as an
Off-Center Fed Windom Antenna with a Short
Arm of 47.7 Feet and a Long Arm of 70.9 Feet.
[ The Top Tip-to-Tip would be 118.6 Feet ]
The Vertical Up-Leg would be 31.4 Feet
[ About 32 Feet above the ground. ]
Short Arm of 47.7 Feet = 1/4 WL @ 60 Meter Band
Long Arm of 70.9 Feet. = 1/4 WL @ 90 Meter Band
Top Tip-to-Tip of 118.6 Feet. = 1/2 WL @ 75 Meter Band
Vertical Up-Leg of 31.4 Feet = 1/4 WL @ 41 Meter Band

TIP - Cut the Windom Antenna for your favorite
Shortwave Radio Listening (SWL) Bands and to
"Fit" the Size of your Property :


Connect Off-Center 47.7 to 70.9 Feed-Point
of the Windom Wire Antenna Element to the
Par EF-SWL Antenna's Antenna Terminal.

Your Coax Cable can then be Grounded at the Shack.
-Or- Where the Coax Cable drops directly down from
the Windom Antenna : Install a Ground Rod and
place a SO-239-to-SO-239 pass-through Adapter
on the Ground Rod as a Remote Grounding Point
Connection for your Coax Cable Feed-in-Line.

Large Size Windom Antenna {~ 100 Feet}
60 Meters = 75 Meters + 49 Meters & 31 Meters
T2T = 97.7 Ft = 59.2 Ft + 38.5 Ft & 24.5 Ft High

Medium Size Windom Antenna {~ 65 Feet}
41 Meters = 49 Meters + 31 Meters & 22 Meters
T2T = 63.0 Ft = 38.5 Ft + 24.5 & 17.1 Ft High

Small Size Windom Antenna {~ 50 Feet}
31 Meters = 41 Meters + 25 Meters & 19 Meters
T2T = 51.5 Ft = 31.8 Ft + 19.7 Ft & 15.1 Ft High

2 - Question - Why Not a Loop Horizontal Antenna
instead of a . . . long, Long. LONG Wire ?

LOOP ANTENNA :

Disconnect the the Shorting Strap between the
two Terminals of the Par EF-SWL Antenna.

Lay-Out the 150 Foot of Antenna Wire as a
Horizontal Loop Antenna at about 20 to 25
Feet above the ground.

Connect the Ends of the Loop Antenna Element
to the Par EF-SWL Antenna's Antenna Terminal
and Antenna Ground Terminal (30 Turn Side)

Your Coax Cable can then be Grounded at the Shack.

TIP - Cut the Loop for your favorite Shortwave Radio
Listening (SWL) Band :
+ Extend the Loop to 165.4 Feet = 49 Meter Band
- Trim the Loop to 136.7 Feet = 41 Metter Band


hope this helps - iane ~ RHF