Dipoles and the rig's RF ground...
 

I have both a 130 foot dipole and a G5RV, I can switch between the two and
the reports are exactly the same on 75. With 100 watts on the G5RV I have
worked well over 100 countries on SSB 75 meters. The day I received the
Olivia for my mix w, worked Russia on it with 5 watts on 20 meters.

I use it nightly on my Navy Mars nets in the 3 Mhz area.

Like the 130 foot dipole I vary the feed line length to tune.

Both feedlines are fed from the rig to the ladderline with coax covered with
ferrite beads at the junction end.



"Cecil Moore" wrote in message
et...
Reg Edwards wrote:
Anybody who boasts about his G5RV has never tried anything else.

Reg, I replaced my 130 ft. dipole with a G5RV so I could
experiment with it. Given my modifications, Nobody can tell
it from the 130 ft. dipole so there's no reason to return
to the 130 ft. dipole. My G5RV has an SWR of less than 2:1
on all eight HF bands.
--
73, Cecil http://www.qsl.net/w5dxp

Dipoles and the rig's RF ground...
 

"Cecil Moore" wrote in message
om...
Reg Edwards wrote:
"Cecil Moore" wrote
My G5RV has an SWR of less than 2:1
on all eight HF bands.

The SWR on your 380-ohm transmission line to the antenna is
umpteen
times greater than that!

I'm not talking about SWR on the series section transformer,
Reg, I'm talking about on the 50 feet of RG-213. And it's
not "umpteen times", rather limited to about ten times.

Isn't it time you changed the name of your SWR meter?

Nope, for a G5RV with the nominal 70 feet of 50 ohm coax,
the SWR meter is indeed reading the SWR on the coax.
Remember, I'm not using a tuner. The coax from the G5RV
goes directly to the transceiver through the SWR meter.
I actually use my SWR meter to display the SWR.
--
73, Cecil http://www.qsl.net/w5dxp
=======================================

I see you are happy to change names when in a tight corner.

The name "Transmission line" has been conveniently changed to "Series
Section Transformer".

But it still has standing waves on it far higher than what you claim
for all bands. And don't standing waves increase loss on SST's just as
much as they do on transmission lines?

Louis is turning over in his grave - yet again.

But what the heck? A G5RV will work even if you havn't got one.

I once set up an 80 feet dipole without a series section transformer.
Unsurprisingly - it worked. ;o)
----
Reg.

Dipoles and the rig's RF ground...
 

Reg Edwards wrote:
The name "Transmission line" has been conveniently changed to "Series
Section Transformer".

But it still has standing waves on it far higher than what you claim
for all bands. And don't standing waves increase loss on SST's just as
much as they do on transmission lines?

As you know, standing waves increase loss on SST's just as much
as they do on transmission lines *OF THE SAME LENGTH*. For instance,
on 3.8 MHz, that 300 ohm series section transformer on a G5RV has
an SWR of about 20:1 and a line loss of about 0.7 dB, about 12% of
one S-unit. That's a small price to pay for multi-band operation.
And using Wireman #554 (like I do) instead of 300 ohm twinlead will
cut those SST losses down to 0.37 dB, about 6% of an S-unit.

I once set up an 80 feet dipole without a series section transformer.
Unsurprisingly - it worked. ;o)

If you fed it with ladder-line, you fed it with a long series
section transformer. :-)
--
73, Cecil http://www.qsl.net/w5dxp

Dipoles and the rig's RF ground...
 

"Cecil Moore" wrote
If you fed it with ladder-line, you fed it with a long series
section transformer. :-)

=========================================

.. . . . and your SWR meter is not an SWR meter - it is a transmitter
loading indicator. ;o)

Go on then - call me a copy cat!
----
Reg.

Dipoles and the rig's RF ground...
 

I have both a 130 foot dipole and a G5RV, I can switch between the two and
the reports are exactly the same on 75. With 100 watts on the G5RV I
have
worked well over 100 countries on SSB 75 meters. The day I received the
Olivia for my mix w, worked Russia on it with 5 watts on 20 meters.

I use it nightly on my Navy Mars nets in the 3 Mhz area.

Like the 130 foot dipole I vary the feed line length to tune.

Hummmmm.......... :/

Both feedlines are fed from the rig to the ladderline with coax covered
with
ferrite beads at the junction end.

Try the 130 ft dipole fed with straight coax and see if you don't
see a difference then. Sure, it won't be huge, but it should be
there, and be quite noticable too on a receiver. I think this why you
are seeing no difference. .
You are "clutter" feeding both antennas. :/ Seriously.
Coax to ladderline...yuk...:/
But saying that, it's obvious it works well nuff I suppose..
I just like to stir it. It's been too slow around here lately.
But...I am serious about what I say.. If you want the vurry
best 80m dipole, feed it with nuttin but coax.
MK

Dipoles and the rig's RF ground...
 

On Sat, 07 Jan 2006 23:51:47 +0000, Dave wrote:

rf 'ground' is a real misunderstood thing. and things like this point out
just how poorly understood it is.
[snip]

Broken shift key, huh?
--
Flap!
The Pig Bladder from Uranus, still waiting for that
hot babe to ask what my favorite planet is. ;-j

Dipoles and the rig's RF ground...
 

"Reg Edwards" wrote in news:dpuo55$isc$1
@nwrdmz02.dmz.ncs.ea.ibs-infra.bt.com:

Single wire feed. I was a student (living off of my wife) and used
what I
could get my hands on.
=======================================

A true radio amateur!

Just get a random, bent wire into the air. A single-wire feed helps a
lot. With a modest ground and a simple tuner you have an efficient,
multi-band, go-anywhere antenna system you can be proud of.

Anybody who boasts about his G5RV has never tried anything else.

Well, I'll put the system I started to design last night up against most
other 80m antennas. But it won't be cheap to build. Needs 8 165-foot
towers, and a bunch of phase delay networks and some power dividers. :-P

But the gain over ordinary ground works to between 9.5 and 10.5 dbi
depending on the direction favoured by the phasing networks.


--
Dave Oldridge+
ICQ 1800667

Dipoles and the rig's RF ground...
 

"Anthony Fremont" wrote in news:FZBwf.39022$9e.30720
@tornado.texas.rr.com:


"Reg Edwards" wrote
Single wire feed. I was a student (living off of my wife) and used
what I
could get my hands on.
=======================================

A true radio amateur!

Just get a random, bent wire into the air. A single-wire feed helps a
lot. With a modest ground and a simple tuner you have an efficient,
multi-band, go-anywhere antenna system you can be proud of.

Anybody who boasts about his G5RV has never tried anything else.

Right.....you should hear the bands open up when you launch a kite
antenna. There's nothing like a few hundred feet of random long wire
up
in the air. ;-)
WARNING: No one should ever do such a thing for what should be very
obvious safety reasons.

I'm a big fan of cubical quads, but you need allot of room for them.

I swear OH8OS used to MAKE his own band openings or 15 back in 65 when I
used to work him from VE8ML. He had a huge quad, 15 elements, I think,
pointed right in my direction.


--
Dave Oldridge+
ICQ 1800667

Dipoles and the rig's RF ground...
 

"Fred W4JLE" wrote in
:

I have both a 130 foot dipole and a G5RV, I can switch between the two
and the reports are exactly the same on 75. With 100 watts on the G5RV
I have worked well over 100 countries on SSB 75 meters. The day I
received the Olivia for my mix w, worked Russia on it with 5 watts on
20 meters.

I use it nightly on my Navy Mars nets in the 3 Mhz area.

Like the 130 foot dipole I vary the feed line length to tune.

Both feedlines are fed from the rig to the ladderline with coax
covered with ferrite beads at the junction end.



"Cecil Moore" wrote in message
et...
Reg Edwards wrote:
Anybody who boasts about his G5RV has never tried anything else.

Reg, I replaced my 130 ft. dipole with a G5RV so I could
experiment with it. Given my modifications, Nobody can tell
it from the 130 ft. dipole so there's no reason to return
to the 130 ft. dipole. My G5RV has an SWR of less than 2:1
on all eight HF bands.

There's nothing wrong with a G5RV if you couple power to its radiating
element efficiently. I usually just don't bother with the coax part of
the feed system and prefer to just run 300 ohm (or better yet 450 ohm)
line right to the shack and feed it through a tuner.

--
Dave Oldridge+
ICQ 1800667

Dipoles and the rig's RF ground...
 

wrote:
If you want the vurry
best 80m dipole, feed it with nuttin but coax.

Well, as a data point, Owen's transmission line loss
calculator says there's 0.362 dB loss in 100 ft. of
RG-213 feeding a 50 ohm antenna on 75m. The loss using
100 ft. of open-wire feedline feeding a 50 ohm antenna
on 75m is 0.169 dB, less than half the loss in the coax.
Even the Wireman #554 "450" ohm line is better than
the coax at 0.269 dB. Where are the losses in a Ladder-
Line fed system?
--
73, Cecil http://www.qsl.net/w5dxp