"Reg Edwards" wrote in message
...
The moral is - DON'T USE A G5RV.

Specially one with any coax in the feedline.

If you've bought one, you've been robbed.

Hi,
At first sight you never uses a G5RV. You opinion is completely false and
will induce novices (and other if I beleive you) in error.
So read this and learn from the master, G5RV himself :
http://www.astrosurf.com/lombry/qsl-g5rv.htm

I confirmed over 250 DXCC in one year with the G5RV at less than 100 W PEP
from 80 to 10m, including WARC. It works ! Not as a beam of course. But very
well for what it cost (about 100 euros). That stays an excellent
investissment, not necessary if you are hunting DX (away that to say 8000 km
in low solar acticvities like now) or want to participate in all contests
(that stays a dipole than I work barefoot) but for ragchewing in local QSO
(inside a radius of to say 5000 km) it is perfect. With an average emitting
power of 50W or so, most hams receive me in voice 59 or more, even 57 up to
VE, east K, VP5, FY, YB. More far the signal decreases (53 and less). But
this is a beam after all.

Thierry
ON4SKY, LX3SKY



Use a random length dipole, longer than about 1/3 of the wavelength at the
lowest frequency of interest. Choose a length which makes best use of the
size of your backyard. Take the 450 or 600-ohm balanced line all the way
back to the shack. You will need a tuner and a choke balun at the tuner.
For multi-band operation you will need a tuner whatever you do.

If you find it inconvenient to feed the dipole in the middle, and you have
a
relatively low local noise level, then feed it at one end and make an
Inverted-L of it. It will then very likely work very well also on 160
metres.

And you will never think of using a G5RV again !

By the way - Louis Varney, G5RV, a real genuine English gentleman, now
no
longer with us, designed his antenna to work most efficiently ONLY on
14.15
MHz, perhaps the best day-or-night, all-year-round, any part of the
sun-spot
cycle, DX frequency. It's very good. And you may not need tuner even with
the coax. Works great with the old fashioned TS-520 with its built-in
tuner
!
----
Reg, G4FGQ

"Thierry" Thierry, see http://www.astrosurf.com/lombry/ wrote in message ...
"Reg Edwards" wrote in message
...
The moral is - DON'T USE A G5RV.

Specially one with any coax in the feedline.

If you've bought one, you've been robbed.

Hi,
At first sight you never uses a G5RV. You opinion is completely false and
will induce novices (and other if I beleive you) in error.

Have you ever actually compared a G5RV to a coax fed dipole on 80m?
I'm talking A/B tests quickly using an antenna switch. His opinion is
most certainly not false. My first hand tests confirm his opinion.
Yes, I didn't make the G5RV's and Windoms that were tested against,
but I wouldn't bother using something like those anyway. It's not my
fault the the ones I tested against were poorly engineered. They were
all storebought antennas. Most made by a co. that uses a state for
part of it's name.

So read this and learn from the master, G5RV himself :
http://www.astrosurf.com/lombry/qsl-g5rv.htm

Even he usually recommended you do away with the junk, and run all
ladder line if using for all bands. The antenna as he designed was for
20m only.

I confirmed over 250 DXCC in one year with the G5RV at less than 100 W PEP
from 80 to 10m, including WARC. It works !

That doesn't mean anything though. You could do that with a mobile
antenna and 10w. How many qso's an antenna makes is not a good
judgement of performance.

Not as a beam of course. But very
well for what it cost (about 100 euros). That stays an excellent
investissment,

I think making a dipole from your own wire, is more cost effective.
Not to mention the best performer, being most won't ruin it by adding
a micky mouse feedline setup.

not necessary if you are hunting DX (away that to say 8000 km
in low solar acticvities like now) or want to participate in all contests
(that stays a dipole than I work barefoot) but for ragchewing in local QSO
(inside a radius of to say 5000 km) it is perfect.

No, it's far from perfect. On 75m phone, where most are closer than
500 miles, my coax fed dipole will eat that G5RV for lunch, if it's
the type and fed like the ones I usually see.

With an average emitting
power of 50W or so, most hams receive me in voice 59 or more, even 57 up to
VE, east K, VP5, FY, YB. More far the signal decreases (53 and less). But
this is a beam after all.

Again, signal reports are not an accurate indicator of antenna
performance, unless you quickly A/B with a switch with a comparison
benchmark antenna like the dipole. If you are two S units under me,
you would still make most all the same contacts I would. You would
just be 2 s units weaker. On an average radio, 2 S units is probably
about 10 db or so. I say this, because most all that change from 100w
to 1kw, usually increase by about 2 S units on most radios I see. When
I compared my dipole to one windom at a field day, and saw 2 S units
better performance on the dipole, just in the loss of efficiency with
the windom, that means he would have to run a KW to equal my 100w.
Thats no way to live. Just because they can still make most of the
qso's I do, doesn't mean the antenna is just as good. If I'm 20 over 9
somewhere, you would still be 10 over 9 if you used your antenna at my
qth. MK

What becomes all the energy sent by my TX on 160m ? What become de
standing
waves and reactive load ? Is it possible than all 100W are lost in the
coax
or the feeder without be emitted ?

Who could explain me this ?

Thanks

Thierry
ON4SKY
===========================

G5RV - WHERE THE POWER GOES ON 160m

Efficiency = Power into / Power out of

Efficiency % Location
========= =======
70.4 L-tuner
21.9 Coax line
78.8 Open wire line
11-6 Antenna wire and soil under anrenna

Overall radiating efficiency at 1.9 MHz = 1.40 %

or 18.5dB, or 3 S-units down relative to a very high 1/2-wave dipole.

Download program DIPOLE3 from website below. It analyses performance of any
dipole, of any length, any wire diameter at any height, and any lengths of
any types and combinations of feedlines. Also calculated are L and C
component values of L-network to match to 50 ohms.
----
=======================
Regards from Reg, G4FGQ
For Free Radio Design Software
go to http://www.g4fgq.com
=======================

Many thanks Reg, good link.

Thierry

"Reg Edwards" wrote in message
...
What becomes all the energy sent by my TX on 160m ? What become de
standing
waves and reactive load ? Is it possible than all 100W are lost in the
coax
or the feeder without be emitted ?

Who could explain me this ?

Thanks

Thierry
ON4SKY
===========================

G5RV - WHERE THE POWER GOES ON 160m

Efficiency = Power into / Power out of

Efficiency % Location
========= =======
70.4 L-tuner
21.9 Coax line
78.8 Open wire line
11-6 Antenna wire and soil under anrenna

Overall radiating efficiency at 1.9 MHz = 1.40 %

or 18.5dB, or 3 S-units down relative to a very high 1/2-wave dipole.

Download program DIPOLE3 from website below. It analyses performance of
any
dipole, of any length, any wire diameter at any height, and any lengths of
any types and combinations of feedlines. Also calculated are L and C
component values of L-network to match to 50 ohms.
----
=======================
Regards from Reg, G4FGQ
For Free Radio Design Software
go to http://www.g4fgq.com
=======================