Antenna for shortwave reception
 

John Smith wrote:

...
Hmmm, from your statements, and text--if adhered to, most-certainly
suggests, they must be following your advise, surely! The "alligators",
or, i.e., stations which are all mouth and no ears ...

However, I am willing to debate, argue, stand-behind, etc., all which I
have said ... I actually HAVE built my antennas, and continue to do so
... indeed, my statement is, "Only lamers buy them."

Regards,
JS

P.S. Just in case you wondered, yes, I did purchase a couple, in the
early days ...

Regards,
JS

The Difference Between : Shortwave Radio Listener (SWL) -and-Amateur Radio Operators (Hams)
 

RHF wrote:


This is Why I refer to Amateur Radio as "The Craft" :
The Mastery* of the Body of Knowledge and Practices
related to the Science and Art of Radio Operating.
* All Praise Be To Them That Do.
-but- that is not me : for i remain simply a plain old
shortwave radio listener : who keeps his swling
"k-i-s-a-p" = keep/ing it simply and practical

I enjoy sending intelligence from point A to point B without wires. I
enjoy making spikes (not Xmas trees) on my FSH-313. My work involves
UHF FM transmitters of between 10 mW and 250 mW. These need to go
300-500 feet (flawlessly). This is very similar to my hobby (what I
enjoy). I can't believe they pay me to do this.

The Difference Between : Shortwave Radio Listener (SWL) -and-Amateur Radio Operators (Hams)
 

On Dec 28, 8:38*pm, Telamon
wrote:
In article ,
*John Smith wrote:

RHF wrote:

[stuff]

RHF, I have no bone to pick with you, don't fall victim to trolls here
which just wish to "stir up chit", to mask their ignorance ...

SNIP

- Now that is funny. One Trolling idiot posting
- a response to another trolling idiot "don't fall
- victim to the Trolls".
-
- --
- Telamon
- Ventura, California

Ah Telamon - You know me all too well ~ RHF

The Difference Between : Shortwave Radio Listener (SWL) -and-Amateur Radio Operators (Hams)
 

On Dec 29, 5:50*am, Dave wrote:
RHF wrote:

This is Why I refer to Amateur Radio as "The Craft" :
The Mastery* of the Body of Knowledge and Practices
related to the Science and Art of Radio Operating.
* All Praise Be To Them That Do.
-but- that is not me : for i remain simply a plain old
shortwave radio listener : who keeps his swling
"k-i-s-a-p" = keep/ing it simply and practical

- I enjoy sending intelligence from point A to point B without wires.
*I
- enjoy making spikes (not Xmas trees) on my FSH-313. *My work
involves
- UHF FM transmitters of between 10 mW and 250 mW. These need to go
- 300-500 feet (flawlessly).
-*This is very similar to my hobby (what I enjoy).
-*I can't believe they pay me to do this.

Dave - You Are One of The Lucky Ones. - enjoy ~ RHF

The Difference Between : Shortwave Radio Listener (SWL) -and-Amateur Radio Operators (Hams)
 

RHF wrote:
On Dec 29, 5:50 am, Dave wrote:
RHF wrote:

This is Why I refer to Amateur Radio as "The Craft" :
The Mastery* of the Body of Knowledge and Practices
related to the Science and Art of Radio Operating.
* All Praise Be To Them That Do.
-but- that is not me : for i remain simply a plain old
shortwave radio listener : who keeps his swling
"k-i-s-a-p" = keep/ing it simply and practical
- I enjoy sending intelligence from point A to point B without wires.
I
- enjoy making spikes (not Xmas trees) on my FSH-313. My work
involves
- UHF FM transmitters of between 10 mW and 250 mW. These need to go
- 300-500 feet (flawlessly).
- This is very similar to my hobby (what I enjoy).
- I can't believe they pay me to do this.

Dave - You Are One of The Lucky Ones. - enjoy ~ RHF
.

I do. Thanks.

Shortwave Radio Listener (SWL) Antennas -versus- Amateur RadioAntennas
 

On Dec 27, 12:57*pm, John Smith wrote:
Billy Burpelson wrote:
...
Say what?

He said he "ain't here to be a ham", so why would he want to transmit?

Well, consider me a "different type of ham." *In that, I always
construct my antennas to receive the best signal for the application at
hand, ALWAYS--transmitting is only a secondary consideration. *As, I
have never found an antenna which has been found to receive the most
efficiently fail to do so in xmit mode. *Given both xmitter and receiver
have the same input impedances ...

I do, frequently, see hams adjust the antenna, and its' type, for the
xmitter--and the best readings which can be obtained in that mode. *I
pay far more attention to how the antenna receives ... I can always
crank up power on this end, should I ever find it necessary--I don't
know what the guys capabilities on the other end is/are ...

Regards,
JS

JS,

Good Antenna Building Concept :
You Can't Talk To Them -unless-
You Can First Hear Them. ~ RHF

The Difference Between : Shortwave Radio Listener (SWL) -and-Amateur Radio Operators (Hams)
 

RHF wrote:

...
- Now that is funny. One Trolling idiot posting
- a response to another trolling idiot "don't fall
- victim to the Trolls".
-
- --
- Telamon
- Ventura, California

Ah Telamon - You know me all too well ~ RHF
.

Problem is, telemundo does not use the term "newsnet troll" correctly.

His definition: "newsnet-troll = anyone not agreeing with me or
pointing out inaccuracies in my text."

Quite obviously, most here will appear as a troll, to telemundo ... sad,
so very, very sad. :-(

Regards,
JS

The Difference Between : Shortwave Radio Listener (SWL) -and- Amateur Radio Operators (Hams)
 

In article ,
John Smith wrote:

RHF wrote:

...
- Now that is funny. One Trolling idiot posting
- a response to another trolling idiot "don't fall
- victim to the Trolls".
-

Ah Telamon - You know me all too well ~ RHF
.

Problem is, telemundo does not use the term "newsnet troll" correctly.

His definition: "newsnet-troll = anyone not agreeing with me or
pointing out inaccuracies in my text."

That is just a comprehension impaired interpretation.

Quite obviously, most here will appear as a troll, to telemundo ... sad,
so very, very sad. :-(


You have a great imagination but you don't know how to usefully apply it.

--
Telamon
Ventura, California

Shortwave Radio Listener (SWL) Antennas -versus- Amateur RadioAntennas
 

RHF wrote:

...
JS,

Good Antenna Building Concept :
You Can't Talk To Them -unless-
You Can First Hear Them. ~ RHF
.

Well, I'd like an antenna like this one (see URL, below.) He comes into
my location in the low valley of CA like a door buster, from his secret
location in NV. Jumping the high Sierra Mountains in a single leap! grin

http://www.smeter.net/w6obb/antenna-farm.php

Regards,
JS

Shortwave Radio Listener (SWL) Antennas -versus- Amateur RadioAntennas
 

Here's why antenna efficiency is important for transmitting but not for
HF receiving.

First, the definition of efficiency: For a transmitting antenna, it's
the fraction of the power applied which is radiated. The remainder is
turned into heat. For receiving, it's the ratio of the power which is
delivered to the receiver to the power which could be delivered to the
receiver if the antenna had no loss. The efficiency of a given antenna
is the same when transmitting and receiving. Sometimes people use
"efficiency" to mean other things -- this is the meaning of the term in
all antenna literature and texts.

Consider this communications system:

transmitter - antenna - propagation path - antenna - receiver - listener

A receiver unavoidably adds noise to the received signal. So if no noise
is injected in the propagation path, the signal/noise ratio is the ratio
of the signal entering the receiver to the noise created by the
receiver's input circuitry. This is generally the case at VHF and above.

When receiver noise dominates, as above, increasing the receive
antenna's efficiency increases the signal arriving at the receiver, so
the signal/noise ratio improves. This allows you to hear the signal
better. But it only works for VHF and above.

HF is a different story. At HF, there's a lot of atmospheric noise
(injected in the "propagation path" part of the system), and unless the
receive antenna and receiver are exceptionally bad, the atmospheric
noise is much greater than the noise created by the receiver. I
mentioned a simple test in my last posting, to see whether this is the
case -- just disconnect the antenna. If the noise level drops,
atmospheric noise dominates. It's not hard to make a receiver that
atmospheric noise will dominate with a 3 foot whip antenna at HF. So at
HF where atmospheric noise dominates, the signal/noise ratio is the
ratio of the signal entering the receiver to the atmospheric noise
entering the receiver. Compare this to the situation described above for
higher frequencies.

Now let's see what happens when we improve the efficiency of an HF
receiving antenna. Because both the signal and the dominant noise come
from locations in front of (that is, on the transmit side of) the
antenna, improving the efficiency of the antenna makes both the signal
and noise greater in the same proportion when they arrive at the
receiver. There's no improvement at all in the signal/noise ratio. The
effect is the same as turning up the receiver volume control. The only
way you can improve the signal/noise ratio is to somehow favor one over
the other, such as by making the antenna directional. And an
inefficient, directional antenna like a Beverage or small loop will
nearly always enable you to hear better in some directions than an
efficient, nondirectional antenna because directionality helps and
inefficiency doesn't hurt.

How about transmit antenna efficiency?

The signal strength from the transmit antenna is proportional to the
antenna's efficiency. (It also depends on other things, but I'm just
talking about efficiency here.) So if the efficiency of the transmit
antenna increases from, say, 33% to 66%, the power levels of the signals
at the receive antenna and the receiver double, and there's no change to
the received noise, on either HF or VHF and above. So improving the
transmit antenna efficiency always improves the signal/noise ratio at
the receiver, in this case by 3 dB.

That's why you can hear bunches of HF stations with a very inefficient
antenna, but they won't hear you if you try to transmit using that same
antenna -- it's because the noise is injected into the system between
you. And it's likely that you'll be able to hear stations just as well
with the very inefficient antenna as with a much larger, efficient one.

Roy Lewallen, W7EL