On 6/11/2020 10:16 PM, Bob McGraw K4TAX wrote:
a special thanks to you for reporting back to the group your findings
and results.
Thanks for your input as well Bob. Lots of talented folks on the
reflector who take the time to respond to questions. The least one can
do is provide feedback.
Tony;
Seems you have done an excellent job and things are working as you
expected. And a special thanks to you for reporting back to the group
your findings and results. I wish everyone did that. We'd all be
informed.
73
Bob, K4TAX
On 6/11/2020 8:00 PM, Tony wrote:
All:
The K3S
the two using the microHAM router software.
Jim N7US
-Original Message-
From: elecraft-boun...@mailman.qth.net On
Behalf Of Tony
Sent: Thursday, June 11, 2020 20:01
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Balanced Mic to Unbalanced Connection Follow Up
Question
All:
The K3S
All:
The K3S seems to work flawlessly with XLR cable connected to the rear
panel mic input as per the groups recommendations. I have pins 1 and 3
connected to the sleeve of the 1/8" plug and pin 2 to the tip. I'm using
a dynamic mic so the bias is turned off. This setup works fine on the
KX3
I use a Shure SM-58 mike with my K3S. It is a balanced dynamic mike.
It has an XLR at the mike and the 8 pin Foster connector at the radio.
I use good quality, 2 conductor, shielded mike cable.
It is wired as follows:
XLR pin #1 to Foster pin #8 {shield}
XLR pin #2 to Foster pin #1
Interesting stuff here. Since the original post was regarding the Rear
Mic jack. Would this method also be recommended for the Front Panel
Mic Jack also?
My guess is yes
Rich
K3RWN
On 6/9/2020 22:50 PM, Don Wilhelm wrote:
Joe,
I did not say anything to the contrary. The 'dongle' that
> A capacitor in series with one side of the balanced line.
First, a dynamic mic element as is found in the PR-781 is neither
balanced nor unbalanced. That is determined by the external
connections (the input circuit to which the mic element is
connected). I know of no current amateur
Both would work.
Sketch out the equivalent circuit and you'll see why.
As to using a TRS or TS 1/8th (3.5mm) plug, you'll have to consult the
radio's manual to see exactly what's connected to the tip and ring, and
if the sleeve is actually connected directly to the chassis, not via a
convoluted
The PR-781 does not like the DC bias supplies from many newer ham radios.
A capacitor in series with one side of the balanced line. Heil offers a
specialized cable for three pin XLR mike to the mike jack on front of
different brands of transceivers. Contains the capacitor as required.
Works for
Since the input is clearly marked MONO, a tip-sleeve is the correct plug. If
one uses a TRS plug, the ring should be connected to the sleeve inside the
plug.
Using a mike which has an XLR, pin 2 should connect to the Tip, pin 3 to the
sleeve, and the shield only connects to XLR pin 1 at the
If yuh ou use a TRS plug, don’t use the “ring” for anything.
Extending the pin 1 wire out of the connector and connecting to the radio
“Ground” lug is also tecvonended in some circles.
Sent from my iPhone
...nr4c. bill
> On Jun 9, 2020, at 4:51 PM, Tony wrote:
>
> All:
>
> I have a
Joe,
I did not say anything to the contrary. The 'dongle' that I was
referring to is the connection to pin 1 which should be connected to the
outside of the K3/K3S enclosure.
73,
Don W3FPR
On 6/9/2020 9:13 PM, Joe Subich, W4TV wrote:
On 2020-06-09 8:14 PM, Don Wilhelm wrote:
So --- make
On 2020-06-09 8:14 PM, Don Wilhelm wrote:
So --- make an adapter so that pins 2 and 3 are connected to the tip
and ring of the mic jack,
No, no, no! The ring of the K3/K3S rear panel mic jack *IS FLOATING*.
Pins 2 and 3 of the XLR *MUST BE* connected to tip and *SLEEVE*.
73,
... Joe,
So --- make an adapter so that pins 2 and 3 are connected to the tip and
ring of the mic jack, then add a one wire 'dongle' exiting from the XLR
plug that is connected to XLR pin 1. Connect that wire to a screw on
the chassis of the K3/K3S/KX2/KX3.
Noise, hum and buzz are then conducted
Correcting *ALL* the typos
So which is correct?
They are electrically equivalent.
Pin 2 of the XLR connection is Mic+
Pin 3 of the XLR connection is Mic-
Pin 1 of the XLR connection is the cable shield (ground).
Mic audio is present between pins 2 and 3.
Pin 1 is nothing more than
Correcting Joe's typo, Mic audio is present between pins 2 and 3, NOT
between 2 and 1.
73, Jim K9YC
On 6/9/2020 2:54 PM, Joe Subich, W4TV wrote:
> So which is correct?
They are electrically equivalent.
Pin 2 of the XLR connection is Mic+
Pin 3 of the XLR connection is Mic-
Pin 1 of the
> So which is correct?
They are electrically equivalent.
Pin 2 of the XLR connection is Mic+
Pin 3 of the XLR connection is Mic-
Pin 1 of the XLR connection is the cable shield (ground).
Mic audio is present between pins 2 and 1.
Pin 1 is nothing more than a shield and should be
All:
I have a follow-up question regarding balanced mics and unbalanced
connections. I'm about to connect a balanced dynamic microphone (Heil
PR-781) to the rear mic input on my K3S which has a 1/8" unbalanced mono
connection.
One recommendation was to connect XLR pin #2 mic (+) to the tip
Not to overdo my posting privilege, but I have something that might be
of interest for sale: An old Johnson 275-watt Matchbox, which is a
link-coupled balanced tuner for 80-10 meters (although WARC bands do not
appear on the bandswitch, it usually works on 30-17-12 when set to an
adjacent
On Thu, May 15, 2014 at 8:58 AM, Vic Rosenthal K2VCO k2vco@gmail.comwrote:
Not to overdo my posting privilege, but I have something that might be of
interest for sale: An old Johnson 275-watt Matchbox, which is a
link-coupled balanced tuner for 80-10 meters (although WARC bands do not
With a pair of KAT100s and a pair of K2s, I need to send 12v up the openline
feeder to control a latching relay at the top of the tower. The easiest way
would be to run the dc on the feedline.and it would be even easier.. if the
isolator would stop the dc from continuing on through the
Dale,
While you could put a bias Tee in each side of the balanced line to make
it work, you need to be aware of the impedance at the points in the
feedline where the DC is taken off. The isolating inductance should
have 5 time (or greater) impedance at all frequencies of interest.
I assume
the
relay from the RF.
73 - Mike WA8BXN
---Original Message---
From: Dale Putnam
Date: 2/11/2014 7:23:31 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] Balanced feedline - DC Isolator
With a pair of KAT100s and a pair of K2s, I need to send 12v up
On 9/2/2013 4:32 PM, Don Wilhelm wrote:
One can feed the 43 foot vertical with ladder line, and do the tuning
in the shack (yes, you can feed a vertical with balanced line),
I strongly object to the word balanced with respect to transmission
line. A better description is 2-wire or parallel
On 9/29/2012 9:12 PM, Robert G. Strickland wrote:
What I'm curious about is whether some such device, at the feed point of a
doublet,
in turn fed by window line is of any use [assuming an appropriate tuner at
the radio
end of the line]. You have said, accurately so, that a current choke at
On 9/30/2012 12:02 AM, Jim Brown wrote:
YES! That is EXACTLY what I have repeated, over and over again. It has
NOTHING to do with coax. Coax, if it is not decoupled by a common mode
choke, simply ADDS to the imbalance that is already present. EVERY
transmission line needs a common mode
Phil,
It is great that you actually know the length of your feedline - most do
not.
I am not questioning how well your antenna/feedline combination works.
All I am trying to get across is that for any claims about how easy a
particular antenna is to tune (with a tuner in the shack), the length
.
-Original Message-
From: Adrian [mailto:vk4...@bigpond.com] Sent: Sunday, 30 September
2012 9:34 AM
To: elecraft@mailman.qth.net
Subject: RE: [Elecraft] Balanced solution for KAT500 tuner?
A UK G call did a graphed efficiency comparison test with the 1:1
coming out
on top. I
In the old days, when RFI did not exist (few of us are old enough not
to remember TVI in the 50s), the Windom MIGHT have been a good idea.
Today, with RF noise sources everywhere and home stereo rigs full of
Pin One Problems ready to bring RF into equipment and detect it,
Windom antennas are
Don,
You must think system rather than individual components. Also with
antennas and feedlines, the where is it connected is a required parameter.
A halfwave dipole in infinite space has a feedpoint impedance of 70
ohms, but brought down to practical heights, the feedpoint impedance is
September
2012 9:34 AM
To: elecraft@mailman.qth.net
Subject: RE: [Elecraft] Balanced solution for KAT500 tuner?
A UK G call did a graphed efficiency comparison test with the 1:1
coming out
on top. I will post it when re-found.
Also from
http://www.theladderline.com/doublets-ladder-line
Designs offer a nice example in their Model 1171.
-Original Message-
From: Adrian [mailto:vk4...@bigpond.com] Sent: Sunday, 30 September
2012 9:34 AM
To: elecraft@mailman.qth.net
Subject: RE: [Elecraft] Balanced solution for KAT500 tuner?
A UK G call did a graphed efficiency
On 9/30/2012 5:37 AM, gold...@charter.net wrote:
So am I correct in my understanding or just totally out in the weeds.
There may be more to it than that. First, no matter what feedline or
matching system you use, there should be a serious common mode choke at
the feedpoint. Second, is this a
.
-Original Message-
From: Adrian [mailto:vk4...@bigpond.com] Sent: Sunday, 30 September
2012 9:34 AM
To: elecraft@mailman.qth.net
Subject: RE: [Elecraft] Balanced solution for KAT500 tuner?
A UK G call did a graphed efficiency comparison test with the 1:1
coming out
on top. I
I believe Joe meant to say ...higher impedance results in lower currents...
--[snip]
Within limits, most tuners are better able to handle high impedance
mismatches than low impedance mismatches because losses tend to be
resistive in nature and the lower impedance results in lower currents
and
Does Elecraft have a balun solution for balanced feeders for the KAT500 at 500
watts?
Steve Barry
University at Buffalo Police
Bissell Hall, Amherst Campus
Tel: 716,645-2228 or 645-8910
Cell: 716,207-9494
FAX: 716,645-3758
__
On 9/29/2012 5:40 AM, Barry, Stephen wrote:
Does Elecraft have a balun solution for balanced feeders for the KAT500 at
500 watts?
See the Choke Cookbook that is Chapter 8 in my RFI Tutorial, and the
discussion in the preceding pages, for an excellent common mode choke
that will satisfy this
Hi,
So are you suggesting using a choke balun on both ends of the parallel wire
feedline?
AB2TC - Knut
Jim Brown-10 wrote
On 9/29/2012 5:40 AM, Barry, Stephen wrote:
Does Elecraft have a balun solution for balanced feeders for the KAT500
at 500 watts?
See the Choke Cookbook that is
I have the same question. The parallel wire feeder can pick up noise also by
itself.
Bob
K6UJ
On Sep 29, 2012, at 11:10 AM, ab2tc wrote:
Hi,
So are you suggesting using a choke balun on both ends of the parallel wire
feedline?
AB2TC - Knut
Jim Brown-10 wrote
On 9/29/2012 5:40
I have the same question. The parallel wire feeder can pick up noise also by
itself.
Bob
K6UJ
On Sep 29, 2012, at 11:10 AM, ab2tc wrote:
Hi,
So are you suggesting using a choke balun on both ends of the parallel wire
feedline?
AB2TC - Knut
Jim Brown-10 wrote
On 9/29/2012 5:40
Jim...
Is there anything to be gained in putting a 1:1 balanced isolator at the feed
point
of an antenna that is fed by a parallel wire feed line? Does such an
arrangement
achieve feed line isolation while preserving the ability of such an antenna to
be
driven on various bands other than
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Balanced solution for KAT500 tuner?
Jim...
Is there anything to be gained in putting a 1:1 balanced isolator at the
feed point of an antenna that is fed by a parallel wire feed line? Does
such an arrangement achieve feed line isolation while
On 9/29/2012 11:10 AM, ab2tc wrote:
So are you suggesting using a choke balun on both ends of the parallel wire
feedline?
Not just a suggestion, but a STRONG recommendation. But leave the word
balun out of this sentence. It is a COMMON MODE CHOKE -- a section of
parallel wire line wound
://mailman.qth.net/mailman/listinfo/elecraft elecraft at
mailman.qth.net
Subject: Re: [Elecraft] Balanced solution for KAT500 tuner?
Jim...
Is there anything to be gained in putting a 1:1 balanced isolator at the
feed point of an antenna that is fed by a parallel wire feed line? Does
On 9/29/2012 11:26 AM, Robert G. Strickland wrote:
Is there anything to be gained in putting a 1:1 balanced isolator at the
feed point
of an antenna that is fed by a parallel wire feed line? Does such an
arrangement
achieve feed line isolation while preserving the ability of such an antenna
On 9/29/2012 2:13 PM, Adrian wrote:
1:1 current balun has proven more efficient in conjunction with the
appropriate balanced (matchbox style)tuner.
With good choke at the feedpoint and at the input to an unbalanced
tuner, there should be NO advantage to using the balanced tuner.
73, Jim K9YC
September 2012 4:26 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Balanced solution for KAT500 tuner?
Jim...
Is there anything to be gained in putting a 1:1 balanced isolator at the
feed point of an antenna that is fed by a parallel wire feed line? Does
such an arrangement achieve feed
...@mailman.qth.net] On Behalf Of David Gilbert
Sent: Sunday, 30 September 2012 8:37 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Balanced solution for KAT500 tuner?
I don't believe that is necessarily true. Can you cite a reference to back
up that statement? Or at least describe
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of David Gilbert
Sent: Sunday, 30 September 2012 8:37 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Balanced solution for KAT500 tuner?
I don't believe that is necessarily true. Can you cite a reference to back
up that statement? Or at least
: RE: [Elecraft] Balanced solution for KAT500 tuner?
A UK G call did a graphed efficiency comparison test with the 1:1 coming out
on top. I will post it when re-found.
Also from
http://www.theladderline.com/doublets-ladder-line-and-automatic-remote-tuner
s ; (spell-checked)
There is also some
, 30 September 2012 4:26 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Balanced solution for KAT500 tuner?
Jim...
Is there anything to be gained in putting a 1:1 balanced isolator at the
feed point of an antenna that is fed by a parallel wire feed line? Does
such an arrangement
on the braid of
the
transmitter cable.
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of David Gilbert
Sent: Sunday, 30 September 2012 10:57 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Balanced solution for KAT500 tuner
@mailman.qth.net
Subject: RE: [Elecraft] Balanced solution for KAT500 tuner?
A UK G call did a graphed efficiency comparison test with the 1:1 coming out
on top. I will post it when re-found.
Also from
http://www.theladderline.com/doublets-ladder-line-and-automatic-remote-tuner
s ; (spell-checked
: Adrian [mailto:vk4...@bigpond.com]
Sent: Sunday, 30 September 2012 9:34 AM
To: elecraft@mailman.qth.net
Subject: RE: [Elecraft] Balanced solution for KAT500 tuner?
A UK G call did a graphed efficiency comparison test with the 1:1 coming out
on top. I will post it when re-found.
Also from
http
Phil,
That depends on the exact length of your feedline and the lengthy of
your radiator.
As I indicated, the impedance in the shack will depend on the feedline
length, a well as your radiator length. Would you kindly share both
lengths with us so we can duplicate your results.
If you are
A 50 ohm non inductive purely resistive DL looks good to a MFJ 459 antenna
analyser too.
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post:
Jim...
Thanks for your reply. I think I've been unclear in my question. I'm not
concerned as
to what it is called, how to build it or what it costs. These things can
all be
agreed upon and implemented.
What I'm curious about is whether some such device, at the feed point of a
doublet,
in
Don,
Actually, my antenna works quite well and so far is the best performing wire
antenna I have raised
up for 80/40/30. My previous delta loop was pretty good for 80/30 but it was a
bit too narrow due to limited
space and the and 40 just did not perform as well as I had hoped.
My 450 ohm
I think it was noted in this month's RadCom. PA0FRI has an interesting design
called a S-Match that looks easy to build and possibly easy to motorize as
well.
http://www.pa0fri.geerligs.com/
Another article that is well worth reading and may apply to some questions
raised in this thread is
Me thinks that Mike needs a rotor that will rotate a house or condo
73,
Steve N7VS Portland, Oregon
I am working on rotating the property for directional control(!!)
Monty,
Your property is rotating; is us the rest of us blokes who won't sit still
while you are getting around to
My approach to wire antennas has been pragmatic since, as a 13-year-old novice,
I tried to load up an 80 meter dipole fed with TV twin lead connected to an
unbalanced tank circuit.
I now have an 80-meter doublet fed with open wire line. A 4:1 balun sits
outside the shack wall - I had it
I am working on rotating the property for directional control(!!)
Monty,
Your property is rotating; is us the rest of us blokes who won't sit still
while you are getting around to us.
Mike Scott
AE6WA Tarzana, CA
K3/100 SN508
___
David,
I have enjoyed the dialog on this subject immensly as it reminds me of the
jouney I travelled to opitmize my wire antenna. The two major sources I have
studied include www.dxengineering (their articles on baluns and coax losses in
multiband antenna installations are excellent) and
A very interesting read, I have a couple of questions about practical
considerations.
The number one rule I look at all antennas with, is that all antennas
are a compromise. Let me know if I am getting off on the wrong foot here.
I like ladder line fed to various antennas (Horiz. Loops,
David,
The Wireman has a lightning arrestor for use with ladder line - it looks
very much like a pair of spark plugs mounted on a piece of copper. It
does not ground the ladder line, but it does provide suppression for
lightning surge voltages.
You may have better luck with a 1:1 balun
David, Industrial Communications Engineers (I.C.E.) makes a couple of open
wire arrestors that I think are well designed. On both legs of the open
wire they feature a DC short to ground (inductor) on the antenna side that
helps drain static ( and resulting noise) from the antenna, a gas tube to
Chuck - AE4CW wrote:
David, Industrial Communications Engineers (I.C.E.) makes a couple of open
wire arrestors that I think are well designed. On both legs of the open
wire they feature a DC short to ground (inductor) on the antenna side that
helps drain static ( and resulting noise) from the
That's important!
ICE says that they will work with impedances of 300-600
ohms. Although the characteristic impedance of a line may
be within this range, the impedance *seen* at a particular
point could be very high or low.
Multiply line SWR by line impedance. Most ladder line is
around
Tom W8JI wrote:
It takes exactly the same common mode impedance and common mode current
and voltage capacity in the balun if it is located at the tuner output
or at the tuner input when the network is a floating unbalanced
Probably true of the 1:1 configuration, but not of the 1:4
Probably true of the 1:1 configuration, but not of the 1:4
configuration. If you analyze the latter in terms of
chokes, you have a choke connected across the differential
signal, so if the differential impedance is high, most of
the current would bypass the antenna.
Why would anyone ever
Tom W8JI wrote:
Why would anyone ever put a 4:1 voltage balun on a tuner input? Bad
enough to use one on the output!
Who said voltage balun? The Elecraft 4:1 baluns are current baluns.
One wouldn't put them directly on the input, but the point was that it
is not sufficient to say that a
David Woolley wrote on Sunday, August 17, 2008 at 1:02 PM
Actually one might put them on the input, in the sense that one might have
a balanced feeder at close to 200 ohms and a balanced tuner at the antenna
end. That's probably the only case in which they would work well. (Given
that good
Actually one might put them on the input, in the sense
that one might
have a balanced feeder at close to 200 ohms and a balanced
tuner at the antenna end. That's probably the only case
in which they would work well.
The basic rule still applies. We can't move any balun to the
input of an
Tom W8JI wrote:
The only time moving the balun helps is if the network is a balanced
network. Even your example shows with the 4:1 balun you still had to use
Agreed. I had overlooked feed point tuner needs to balanced in that case.
a balanced tuner. With an unbalanced tuner the feedline
The question is, what is good enough? To minimize radiation from an open
wire tuned feeder requires, I believe, that the currents in the two wires to
be equal in magnitude and have a phase difference of 180 degrees at the
feedpoint of the feedline. Feeding a slanted dipole, which is certainly
Also, the load has a huge effect on balance. Few wire antennas for HF offer
decently balanced loads. Unless the wires are literally wavelengths (usually
hundreds of feet) from the earth and other objects, those objects will have
a strong effect on the currents on each side of the antenna. The
I heard some one say that a balanced tuner is very expensive to build. I used
some quarter inch copper tubing from the hardware store to build a four inch
coil. This is the tubing for a ice maker. I then built a four inch coil and
tapped it to a multi position switch from radio shack. I had a
I heard some one say that a balanced tuner is very
expensive to build. I used some quarter inch copper tubing
from the hardware store to build a four inch coil. This is
the tubing for a ice maker. I then built a four inch coil
and tapped it to a multi position switch from radio shack.
I had
On Sat, 16 Aug 2008 11:22:52 -0400, Tom W8JI wrote:
Moving the balun to the input of an unbalanced network does
NOT make life on the balun or the system easier for the
truly difficult problem, common mode isolation.
I strongly agree with all of this. One of the most important
functions of a
How about a normal L-type network? Connect one side to the balanced
line, and the other side via a current balun to the 50 coax. The tuner
is 'RF-floating'. (You can run the coax through a toroid or use two
seperate wires to make the current balun.)
73,
Arie PA3a
How about a normal L-type network? Connect one side to the balanced line,
and the other side via a current balun to the 50 coax. The tuner is
'RF-floating'. (You can run the coax through a toroid or use two seperate
wires to make the current balun.)
73,
Arie PA3a
How about a normal L-type network? Connect one side to the
balanced
line, and the other side via a current balun to the 50
coax. The tuner
is 'RF-floating'. (You can run the coax through a toroid
or use two
seperate wires to make the current balun.)
Arie,
Respectfully that does not work at
Arie,
An L network with the inductor in series with the line can be easily
made into a balanced tuner - use half the inductance and put the result
in series with each leg of the load. I have often thought about
creating a tuner like that by altering a KAT100 (using a second board
and set of
So, Tom, how would you comment upon a transistorised rig of 50 ohms
impedance unbalanced output connected to an unbalanced pi configuration
antenna coupling unit (variable C1 between input and ground, variable
series L in the hot lead, and variable C2 between output and ground)
followed by a
So, Tom, how would you comment upon a transistorised rig
of 50 ohms impedance unbalanced output connected to an
unbalanced pi configuration antenna coupling unit
(variable C1 between input and ground, variable series L
in the hot lead, and variable C2 between output and
ground) followed by a
Tom, thanks for this.
Actually, I do not think it OT. My KAT100 is an unbalanced coupling
unit, and my antenna is as described, so I am looking to match it
properly! At present I have a 4:1 balun (relieved from duty at the font
end of an HF LPDA) connecting the 450 ohm feeder to a short
since i just run qrp i have an elecraft t-1 remoted 60ft from my shack at
the base of an oak tree at the midpoint of my dipole.
a simple injection circuit provides for remote tune activation.
73
jim ab3cv
___
Elecraft mailing list
Post to:
forgot to add that i'm using a ferrite choke on the input of the t-1 current
on the outside of the coax which is buried all the way back to the house.
tunes 80m to 10m, need to try it on 6m now that i have a k3.
73
jim ab3cv
___
Elecraft mailing
I used an MFJ-835 Balanced Antenna current meter to measure the currents in
each side of the ladder line connected to my Cobra Ultralite antenna. It has
two 0 to 100 scales on it. One is for Side1 and the other for Side2 of the
ladder line. I compared the Johnson Matchbox, the KAT3/BL2 balun (4
Let's try spaces instead of tabs for the tables.
Here's a summary of the sums of the scale readings (side1 plus side 2).
Keep in mind that I may have switched scales from band to band but it is the
relative numbers in each row are all on the same scale.
BandJMBDirect4to11to1
: Geoffrey Mackenzie-Kennedy [EMAIL PROTECTED]
Date: 2007/09/10 Mon AM 05:09:13 BST
To: Ron D'Eau Claire [EMAIL PROTECTED]
CC: Elecraft Discussion List elecraft@mailman.qth.net
Subject: Re: [Elecraft] Balanced AT
Ron AC7AC wrote:
Another issue with a balanced AT is that they tend to be used
In a message dated 9/10/07 1:10:42 PM Eastern Daylight Time,
[EMAIL PROTECTED] writes:
If I had a doublet I would seriously consider feeding it like the W5DXP
which uses switched ladder line for matching . Looks cheap, low loss and
easy
to do: any residual mismatch should be compensated
Jack Brindle [EMAIL PROTECTED] wrote on Sunday, September 09, 2007
at 4:15 AM :
While such a tuner might be fun to work with, it would unfortunately have
a very short life due to burnout of the relay contacts when tuning at
full power. There are also very high voltages created for various
: [Elecraft] Balanced AT
While such a tuner might be fun to work with, it would unfortunately have
a very short life due to burnout of the relay contacts when tuning at
full power. There are also very high voltages created for various
combinations of L and C while tuning is going on, which
Another issue with a balanced AT is that they tend to be used in multiband
systems fed with open wire line where high SWRs are expected. High SWRs mean
very, very high RF voltages at a current loop, demanding relays, etc.,
that can safely deal with thousands of volts of RF at any power level much
Of course the tuner was feeding a 22-foot WHIP as well as a ship G.
Sorry 'bout that. (Dang spel chekkers don't warn me when I type the wrong
word...)
Ron AC7AC
-Original Message-
...As a practical example of what RF voltages can do, on large ships I often
encountered SGC unbalanced
Ron AC7AC wrote:
Another issue with a balanced AT is that they tend to be used in multiband
systems fed with open wire line where high SWRs are expected. High SWRs mean
very, very high RF voltages at a current loop, demanding relays, etc.,
that can safely deal with thousands of volts of RF at
While such a tuner might be fun to work with, it would unfortunately
have a very short life due to burnout of the relay contacts when
tuning at full power. There are also very high voltages created for
various combinations of L and C while tuning is going on, which would
undoubtedly
Doesn't an SGC fit this bill? I use an SG237 to tune a portable inverted V
fed by 300ohm (or thereabouts) ribbon - arms cut at 20m, on a 10m telescopic
pole and it tunes up on 80m - 10m a treat.
Am I missing something in your post?
On 7/9/07 01:23, [EMAIL PROTECTED] [EMAIL PROTECTED] sent:
In
David Ferrington, M0XDF wrote:
Doesn't an SGC fit this bill? I use an SG237 to tune a portable inverted V
fed by 300ohm (or thereabouts) ribbon - arms cut at 20m, on a 10m telescopic
pole and it tunes up on 80m - 10m a treat.
Am I missing something in your post?
Yes, you are missing the
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