KR> antennae tuning update

[AVLEC]

Guys,
Today I spoke to an old radio technician (35 years experience) about tuning
the antennae in the aircraft. He said that I would definately get false
readings with the SWR meter that I have and that I shouldn't use it as it
was designed for 29mghz. He also said that tunung it in my workshop with a
corrugated iron roof won't help either. I have arranged to borrow a Bird
Wattmeter from him so it should be plain sailing from here.
So as it turns out, I was talking a load of dribble after all. Hey what do I
know anyway!
In my defence, I did try tuning it with my meter first and I managed to get
the SWR below 1 on the lower freq and below 1.5 on the high freq. I don't
know if I was imagining it but I could have sworn that the received audio
was louder and clearer. I will compare the results with what the Bird tells
me.
Regards
Dene Collett
KR2SRT builder
South africa
Whisper assembler
See: www.whisperaircraft.com
mailto: av...@telkomsa.net

KR> antennae tuning update

[Dave Arbogast, CISSP]

Yes, it will be interesting to see.  Just remember, it is possible your 
antena match was as close to perfect when you started as you can get 
but unless you test it you'll never know how bad it could be.  The Bird 
will show you.

-dave

AVLEC wrote:

>Guys,
>Today I spoke to an old radio technician (35 years experience) about tuning
>the antennae in the aircraft. He said that I would definately get false
>readings with the SWR meter that I have and that I shouldn't use it as it
>was designed for 29mghz. He also said that tunung it in my workshop with a
>corrugated iron roof won't help either. I have arranged to borrow a Bird
>Wattmeter from him so it should be plain sailing from here.
>So as it turns out, I was talking a load of dribble after all. Hey what do I
>know anyway!
>In my defence, I did try tuning it with my meter first and I managed to get
>the SWR below 1 on the lower freq and below 1.5 on the high freq. I don't
>know if I was imagining it but I could have sworn that the received audio
>was louder and clearer. I will compare the results with what the Bird tells
>me.
>Regards
>Dene Collett
>KR2SRT builder
>South africa
>Whisper assembler
>See: www.whisperaircraft.com
>mailto: av...@telkomsa.net
>
>
>___
>Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp
>to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net
>Post photos, introductions, and For Sale items to 
>http://www.kr2forum.com/phpBB2/index.php
>please see other KRnet info at http://www.krnet.org/info.html
>  
>

KR> antennae tuning

[AVLEC]

Hi KR radio heads
This one is for the radio literate. I have just installed an antennae into
an aircraft made from coax only. I left the radiator and counterpoise too
long on purpose so that I could tune it to length in the aircraft using a
SWR meter and a handheld radio. Here is where my confusion starts.
I have in the past built a number of antennae for CB radio and have tuned
them with one of two SWR meters that I have and they worked fine.
Today I spoke to a guy that has built a few airband antennae and he says
that the SWR meters suitable for CB radio freq are not suitablr for
airband?? As far as I know all a SWR meter is is a voltmeter so why should
the freq make any difference? He also told me that a handheld radio does not
put out enough power to be able to get reliable readings??? Sounds really
obsurd to me.
Comments from those in the know would be very much appreciated.

Regards
Dene Collett
KR2SRT builder
South africa
Whisper assembler
See: www.whisperaircraft.com
mailto: av...@telkomsa.net

KR> antennae tuning

[VIRGIL N SALISBURY]

The CB freq is 27 Meg. Airband is108 to137 Meg. 
A BIG difference. HF VS VHF, Tune for max signal on receive, Virg

On Mon, 26 Feb 2007 23:34:39 +0200 "AVLEC"  writes:
> Hi KR radio heads
> This one is for the radio literate. I have just installed an 
> antennae into
> an aircraft made from coax only. I left the radiator and 
> counterpoise too
> long on purpose so that I could tune it to length in the aircraft 
> using a
> SWR meter and a handheld radio. Here is where my confusion starts.
> I have in the past built a number of antennae for CB radio and have 
> tuned
> them with one of two SWR meters that I have and they worked fine.
> Today I spoke to a guy that has built a few airband antennae and he 
> says
> that the SWR meters suitable for CB radio freq are not suitablr for
> airband?? As far as I know all a SWR meter is is a voltmeter so why 
> should
> the freq make any difference? He also told me that a handheld radio 
> does not
> put out enough power to be able to get reliable readings??? Sounds 
> really
> obsurd to me.
> Comments from those in the know would be very much appreciated.
> 
> Regards
> Dene Collett
> KR2SRT builder
> South africa
> Whisper assembler
> See: www.whisperaircraft.com
> mailto: av...@telkomsa.net
> 
> 
> ___
> Search the KRnet Archives at 
> http://www.maddyhome.com/krsrch/index.jsp
> to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net
> Post photos, introductions, and For Sale items to 
> http://www.kr2forum.com/phpBB2/index.php
> please see other KRnet info at http://www.krnet.org/info.html
> 
> 

KR> antennae tuning

[AVLEC]

Virg,
 I am well aware of what the frequencies are. How else would I be able to
calculate what the THEORETICAL resonant length should be? The problem is
that as soon as you install the antennae into the airframe you get
capacitive coupling between the structure and the antennae which usually
lowers the resonant freq of the antennae. The antennae should therefore be
fine tuned in the position where it is going to spend the rest of its days.
 My question was whether the
SWR meter that I have used on CB freq was able to do airband freq as I was
always under the
impression that it didn't care what freq passed through it. It is after all
just a voltmeter. A resonant antennae would absorb maximum current, dropping
the voltage to a minimum which would be measured as a low reflected power
and vice versa.I would imagine that the power output of the transmitter
would be the limiting factor. You could reach a situation where the power
transmitted was too much for the meters level adjustment to bring the
reading within range of the meter's scale.
Regards
Dene Collett
KR2SRT builder
South africa
Whisper assembler
See: www.whisperaircraft.com
mailto: av...@telkomsa.net
- Original Message -
From: "VIRGIL N SALISBURY" <virg...@juno.com>
To: <kr...@mylist.net>
Sent: Tuesday, February 27, 2007 5:48 AM
Subject: Re: KR> antennae tuning


> The CB freq is 27 Meg. Airband is108 to137 Meg.
> A BIG difference. HF VS VHF, Tune for max signal on receive, Virg

KR> antennae tuning

[Louis Staalberg]

Dene Collett wrote:

> My question was whether the  SWR meter that I have used on CB freq was
>able to do airband freq as I was always under the  impression that it 
>didn't care
> what freq passed through it.

SWR meters *do* care about the freq. The Bird Watt meter has many 
inserts
for different frequency ranges.If your SWR meter is a commercially 
available
meter it should specify the frequency range.

They also have a "sensitivity" in other words how low or how high a 
power
can be measured.

If you are handy with electronics, you could fabricate a "field strenght 
meter".
A small box with, a small antenna, inside the box a tuned circuit to the
frequency you are using, a diode rectifier and a capacitor and measure 
the
voltage across the capacitor with a sensitive voltmeter .
Put the instrument away from your antenna, say 10 meters or so,
as long as you get a deflection of the needle and simply tune for 
maximum.
Good luck.

KR> antennae tuning

[Wolfgang Decker]

Dene,

you should be able to use your CB radio SWR meter for VHF as well. These
things work by coupling a conductor parallel to the RF cable (they are not
connected) and through a diode setup you switch the measurement between
forward power and reflected power. The total amount of power that couples
into the meter depends on frequency, but the coupling factor is the same for
forward and reflected power, and since you only want to measure the ratio
between the two it does not matter. It might be, though, that you are not
able to tune to a full 100% in the forward setting, in which case you need
to adjust the reading for the reflected power.

If you want to measure the actual power going to the antenna, then you need
to have a tuned meter, such as the Bird Wattmeter with a respective insert.

Greetings from the still cold Western Pennsylvania,

Wolfgang
N1YM

-Original Message-
From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net]On
Behalf Of AVLEC
Sent: Monday, February 26, 2007 4:35 PM
To: KRnet
Subject: KR> antennae tuning


Hi KR radio heads
This one is for the radio literate. I have just installed an antennae into
an aircraft made from coax only. I left the radiator and counterpoise too
long on purpose so that I could tune it to length in the aircraft using a
SWR meter and a handheld radio. Here is where my confusion starts.
I have in the past built a number of antennae for CB radio and have tuned
them with one of two SWR meters that I have and they worked fine.
Today I spoke to a guy that has built a few airband antennae and he says
that the SWR meters suitable for CB radio freq are not suitablr for
airband?? As far as I know all a SWR meter is is a voltmeter so why should
the freq make any difference? He also told me that a handheld radio does not
put out enough power to be able to get reliable readings??? Sounds really
obsurd to me.
Comments from those in the know would be very much appreciated.

Regards
Dene Collett
KR2SRT builder
South africa
Whisper assembler
See: www.whisperaircraft.com
mailto: av...@telkomsa.net


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KR> antennae tuning

[VIRGIL N SALISBURY]

To keep it short, Tune for max receive signal, Virg

On Tue, 27 Feb 2007 07:13:22 +0200 "AVLEC" <av...@telkomsa.net> writes:
> Virg,
>  I am well aware of what the frequencies are. How else would I be 
> able to
> calculate what the THEORETICAL resonant length should be? The 
> problem is
> that as soon as you install the antennae into the airframe you get
> capacitive coupling between the structure and the antennae which 
> usually
> lowers the resonant freq of the antennae. The antennae should 
> therefore be
> fine tuned in the position where it is going to spend the rest of 
> its days.
>  My question was whether the
> SWR meter that I have used on CB freq was able to do airband freq as 
> I was
> always under the
> impression that it didn't care what freq passed through it. It is 
> after all
> just a voltmeter. A resonant antennae would absorb maximum current, 
> dropping
> the voltage to a minimum which would be measured as a low reflected 
> power
> and vice versa.I would imagine that the power output of the 
> transmitter
> would be the limiting factor. You could reach a situation where the 
> power
> transmitted was too much for the meters level adjustment to bring 
> the
> reading within range of the meter's scale.
> Regards
> Dene Collett
> KR2SRT builder
> South africa
> Whisper assembler
> See: www.whisperaircraft.com
> mailto: av...@telkomsa.net
> - Original Message -
> From: "VIRGIL N SALISBURY" <virg...@juno.com>
> To: <kr...@mylist.net>
> Sent: Tuesday, February 27, 2007 5:48 AM
> Subject: Re: KR> antennae tuning
> 
> 
> > The CB freq is 27 Meg. Airband is108 to137 Meg.
> > A BIG difference. HF VS VHF, Tune for max signal on receive, Virg
> 
> 
> 
> ___
> Search the KRnet Archives at 
> http://www.maddyhome.com/krsrch/index.jsp
> to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net
> Post photos, introductions, and For Sale items to 
> http://www.kr2forum.com/phpBB2/index.php
> please see other KRnet info at http://www.krnet.org/info.html
> 
> 

KR> antennae tuning

[Dave Arbogast, CISSP]

Louis Staalberg wrote:

>Dene Collett wrote:
>
>  
>
>>My question was whether the  SWR meter that I have used on CB freq was
>>able to do airband freq as I was always under the  impression that it 
>>didn't care
>>what freq passed through it.
>>
>>
>
>SWR meters *do* care about the freq. The Bird Watt meter has many 
>inserts
>for different frequency ranges.If your SWR meter is a commercially 
>available
>meter it should specify the frequency range.
>
>They also have a "sensitivity" in other words how low or how high a 
>power
>can be measured.
>
>If you are handy with electronics, you could fabricate a "field strenght 
>meter".
>A small box with, a small antenna, inside the box a tuned circuit to the
>frequency you are using, a diode rectifier and a capacitor and measure 
>the
>voltage across the capacitor with a sensitive voltmeter .
>Put the instrument away from your antenna, say 10 meters or so,
>as long as you get a deflection of the needle and simply tune for 
>maximum.
>Good luck.
>
>
>  
>
I agree completely with Louis I'm only a technical class amateur 
radio operator, but this basic principle was part of our study material.
-dave
KB8SSA

KR> antennae tuning

[Dave Arbogast, CISSP]

Wolfgang Decker wrote:

>Dene,
>
>you should be able to use your CB radio SWR meter for VHF as well. These
>things work by coupling a conductor parallel to the RF cable (they are not
>connected) and through a diode setup you switch the measurement between
>forward power and reflected power. The total amount of power that couples
>into the meter depends on frequency, but the coupling factor is the same for
>forward and reflected power, and since you only want to measure the ratio
>between the two it does not matter. It might be, though, that you are not
>able to tune to a full 100% in the forward setting, in which case you need
>to adjust the reading for the reflected power.
>
>If you want to measure the actual power going to the antenna, then you need
>to have a tuned meter, such as the Bird Wattmeter with a respective insert.
>
>Greetings from the still cold Western Pennsylvania,
>
>Wolfgang
>N1YM
>
>-Original Message-
>From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net]On
>Behalf Of AVLEC
>Sent: Monday, February 26, 2007 4:35 PM
>To: KRnet
>Subject: KR> antennae tuning
>
>
>Hi KR radio heads
>This one is for the radio literate. I have just installed an antennae into
>an aircraft made from coax only. I left the radiator and counterpoise too
>long on purpose so that I could tune it to length in the aircraft using a
>SWR meter and a handheld radio. Here is where my confusion starts.
>I have in the past built a number of antennae for CB radio and have tuned
>them with one of two SWR meters that I have and they worked fine.
>Today I spoke to a guy that has built a few airband antennae and he says
>that the SWR meters suitable for CB radio freq are not suitablr for
>airband?? As far as I know all a SWR meter is is a voltmeter so why should
>the freq make any difference? He also told me that a handheld radio does not
>put out enough power to be able to get reliable readings??? Sounds really
>obsurd to me.
>Comments from those in the know would be very much appreciated.
>
>Regards
>Dene Collett
>KR2SRT builder
>South africa
>Whisper assembler
>See: www.whisperaircraft.com
>mailto: av...@telkomsa.net
>
>  
>
Here's the details about the  - Bird Watt meter - Notice the different 
incerts for different ranges... and the further you get from the center 
of the range the less accurate the measurment will be.  
http://www.radiodan.com/Henry/misc/bird.htm

Frequency ranges:
A = 25-60 MHz
B = 50-125 MHz
C = 100-250 MHz
D = 200-500 MHz
E = 400-1000 MHz
H = 2-30 MHz.   
Examples: (full scale power)
25A = 25 watts 25-60 MHz
500C = 500 watts 100-250 MHz
2500H = 2500 watts 2-30 MHz


-dave
KB8SSA

KR> antennae tuning

[JIM RALEIGH]

could you show the details of your construction of your antennae?  I just
bought a radio and don't have an antennae yet.
- Original Message - 
From: "AVLEC" <av...@telkomsa.net>
To: "KRnet" <kr...@mylist.net>
Sent: Monday, February 26, 2007 3:34 PM
Subject: KR> antennae tuning


> Hi KR radio heads
> This one is for the radio literate. I have just installed an antennae into
> an aircraft made from coax only. I left the radiator and counterpoise too
> long on purpose so that I could tune it to length in the aircraft using a
> SWR meter and a handheld radio. Here is where my confusion starts.
> I have in the past built a number of antennae for CB radio and have tuned
> them with one of two SWR meters that I have and they worked fine.
> Today I spoke to a guy that has built a few airband antennae and he says
> that the SWR meters suitable for CB radio freq are not suitablr for
> airband?? As far as I know all a SWR meter is is a voltmeter so why should
> the freq make any difference? He also told me that a handheld radio does
not
> put out enough power to be able to get reliable readings??? Sounds really
> obsurd to me.
> Comments from those in the know would be very much appreciated.
>
> Regards
> Dene Collett
> KR2SRT builder
> South africa
> Whisper assembler
> See: www.whisperaircraft.com
> mailto: av...@telkomsa.net
>
>
> ___
> Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp
> to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net
> Post photos, introductions, and For Sale items to
http://www.kr2forum.com/phpBB2/index.php
> please see other KRnet info at http://www.krnet.org/info.html

KR> antennae tuning

[AVLEC]

Wolfgang, YOU DA MAN!!
You sound like you know what you are talking about. I will go ahead and tune
with what looks like the best meter of the two I have. Thanks
Regards
Dene Collett
KR2SRT builder
South africa
Whisper assembler
See: www.whisperaircraft.com
mailto: av...@telkomsa.net
- Original Message -

KR> antennae tuning

[AVLEC]

Virg wrote:
   To keep it short, Tune for max receive signal, Virg


Thanks Virg
You should have been a teacher, I learnt a whole bunch from that one
sentence!
Regards
Dene Collett
KR2SRT builder
South africa
Whisper assembler
See: www.whisperaircraft.com
mailto: av...@telkomsa.net
- Original Message -
From: "VIRGIL N SALISBURY" <virg...@juno.com>
To: <kr...@mylist.net>
Sent: Tuesday, February 27, 2007 11:00 PM
Subject: Re: KR> antennae tuning


>

KR> antennae tuning

[AVLEC]

Guys,
I have three articles here written by one Jim Vance. They handle building
antennae for aircraft (his own KR2) from co axial cable only. He also
explains how to use an SWR meter to tune the antennae. There is no mention
of using a specific SWR meter for the freq. I have sent them to Jim Raleigh
privately. Maybe someone can post them somewhere for all to see, Mark???
They even have pictures!! Actually they are very well written and could
easily have been used in a "how to" text book.

I think Wolfgang is on the right track regarding SWR meters, all I need to
measure is the ratio between the forward and reflected power. If the meter
is not suited to the freq, then it should give the same error both ways.
What else would the level setting be for but to set the needle to max scale
for forward power. The reflected power would then be a ratio of that full
scale readingright?? Nowhere on the meters scale does it even mention
watts but it does mention RATIO. It is after all a "standing wave RATIO"
meter and not a wattmeter. Now if I wanted to measure the actual power then
I would need something like a Bird wattmeter. This is my understanding of it
anyway and may well be totally screwed up.
Regards
Dene Collett
KR2SRT builder
South africa
Whisper assembler
See: www.whisperaircraft.com
mailto: av...@telkomsa.net

KR> antennae tuning

[AVLEC]

Louis Wrote:
"SWR meters *do* care about the freq. The Bird Watt meter has many
> inserts
> for different frequency ranges.If your SWR meter is a commercially
> available
> meter it should specify the frequency range.
Hi Louis
Yes I have used a bird wattmeter many times. It is a real piece of precision
measuring equipment. I used to use it on both UHF and VHF telemetry antennae
when tracing faults with communications.

I have two SWR meters and neither of them specify any freq on them. They
came with a bunch of CB radios that I bought from a guy that was leaving the
country. It is years since I last used them but I do remember that they
didn't give the same readings when both tried in the same antennae/ radio
installation. Maybe they are for different frequencies. I see a visit to our
local communications expert coming up soon!

Regards
Dene Collett
KR2SRT builder
South africa
Whisper assembler
See: www.whisperaircraft.com
mailto: av...@telkomsa.net

KR> antennae tuning

[Lee Van Dyke]

I know this subject has been going around the net for days and days and 
days,,, I have an ICOM handheld, with a cable I bought from Radio Shack, 
with an antena from a swap mart (aircraft swap mart)  $5.00.  1 piece of 
alum foil around the mount area and I have a 150-200 mile range.  Do not 
over think this thing, build it install it and fly it.

that is all


Lee Van Dyke
Mesa AZ 85212
l...@vandyke5.com
N783JB  Flying  "Snakebite" 

KR> antennae tuning

[Jim]

Hey Lee this doe'snt have anything to do with antenna tuning. However I'm 
getting ready to put main spars in and the landing gear I was thinking about 
putting the retractable landing gear.
My plan is to put a 0-200 cont and swing as long a prop as possable and had 
thought to put on extentions on the gear to get the extra clearance for the 
propeller.
Would you have any input on that or do you know of anyone that has done that
Thanks in advance for your input Jim B

I have friends down there from when I lived there prehaps you might know 
some of them they have hangars at Falcon field Curt and Cindy Browning, Tim 
and Glen and Judy Yoder, Rick Adams, Jim Landers, John Chambers ,Andy 
Francis, There are many more also Falcon was a unique airport when I was 
down there I understand it's changed some .
aerobe...@cox.net
- Original Message - 
From: "Lee Van Dyke" <l...@vandyke5.com>
To: "KRnet" <kr...@mylist.net>
Sent: Wednesday, February 28, 2007 10:54 PM
Subject: Re: KR> antennae tuning


>I know this subject has been going around the net for days and days and
> days,,, I have an ICOM handheld, with a cable I bought from Radio Shack,
> with an antena from a swap mart (aircraft swap mart)  $5.00.  1 piece 
> of
> alum foil around the mount area and I have a 150-200 mile range.  Do not
> over think this thing, build it install it and fly it.
>
> that is all
>
>
> Lee Van Dyke
> Mesa AZ 85212
> l...@vandyke5.com
> N783JB  Flying  "Snakebite"
>
>
>
> ___
> Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp
> to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net
> Post photos, introductions, and For Sale items to 
> http://www.kr2forum.com/phpBB2/index.php
> please see other KRnet info at http://www.krnet.org/info.html
> 

KR> antennae tuning

[Wolfgang Decker]

"1 piece of alum foil around the mount area and I have a 150-200 mile range.
Do not
over think this thing, build it install it and fly it."

Tuning an antenna is not only about increasing range or receiving
sensitivity, it actually increases the lifetime of your radio, or at least
of the RF transistors in the amp stage. Keep in mind that all the power that
is reflected from a mismatched antenna goes right back into the transistors,
where it just heats the electronic circuits. Radios have been silenced very
quickly that way.
Dene is doing it the right way - after all all of us put enormous efforts
into tuning the aircraft engines to exactly where they need to be. So why
stop at the radios? After all, a simple SWR meter sets you back about $25.

Wolfgang Decker
Beaver Falls, PA
Basement almost ready to get started

KR> antennae tuning

[Mark Langford]

I have an avionics expert buddy who reminded me that turning on a 
transponder with no antenna connected can fry the thing in a matter of 
seconds.  250 watts with no where to go, or something like that.  I suspect 
he knows what he's talking about, so keep that in mind when installing a 
transponder and wanting to check to see if it lights up before you install 
the antenna.

Mark Langford, Harvest, AL
see homebuilt airplane at http://www.N56ML.com
email to N56ML "at" hiwaay.net

KR> antennae tuning

[Mark Wegmet]

You might want to Google EMP or Electro Magnetic Pulse to get more detail on
Mr. Decker's "Keep in mind" comment.

-Original Message-
From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net] On Behalf
Of Wolfgang Decker
Sent: Friday, March 02, 2007 8:38 PM
To: KRnet
Subject: RE: KR> antennae tuning



"1 piece of alum foil around the mount area and I have a 150-200 mile range.
Do not
over think this thing, build it install it and fly it."

Tuning an antenna is not only about increasing range or receiving
sensitivity, it actually increases the lifetime of your radio, or at least
of the RF transistors in the amp stage. Keep in mind that all the power that
is reflected from a mismatched antenna goes right back into the transistors,
where it just heats the electronic circuits. Radios have been silenced very
quickly that way.
Dene is doing it the right way - after all all of us put enormous efforts
into tuning the aircraft engines to exactly where they need to be. So why
stop at the radios? After all, a simple SWR meter sets you back about $25.

Wolfgang Decker
Beaver Falls, PA
Basement almost ready to get started



___
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to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net
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4:19 PM

KR> antennae tuning

[Lee Van Dyke]

I have almost 200 hours on the Radio now,  seems to be just fine.

Lee

- Original Message - 
From: "Mark Wegmet" <markweg...@charter.net>
To: "'KRnet'" <kr...@mylist.net>
Sent: Friday, March 02, 2007 8:01 PM
Subject: RE: KR> antennae tuning


> You might want to Google EMP or Electro Magnetic Pulse to get more detail 
> on
> Mr. Decker's "Keep in mind" comment.
>
> -Original Message-
> From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net] On Behalf
> Of Wolfgang Decker
> Sent: Friday, March 02, 2007 8:38 PM
> To: KRnet
> Subject: RE: KR> antennae tuning
>
>
>
> "1 piece of alum foil around the mount area and I have a 150-200 mile 
> range.
> Do not
> over think this thing, build it install it and fly it."
>
> Tuning an antenna is not only about increasing range or receiving
> sensitivity, it actually increases the lifetime of your radio, or at least
> of the RF transistors in the amp stage. Keep in mind that all the power 
> that
> is reflected from a mismatched antenna goes right back into the 
> transistors,
> where it just heats the electronic circuits. Radios have been silenced 
> very
> quickly that way.
> Dene is doing it the right way - after all all of us put enormous efforts
> into tuning the aircraft engines to exactly where they need to be. So why
> stop at the radios? After all, a simple SWR meter sets you back about $25.
>
> Wolfgang Decker
> Beaver Falls, PA
> Basement almost ready to get started
>
>
>
> ___
> Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp
> to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net
> Post photos, introductions, and For Sale items to
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>
>
> -- 
> No virus found in this incoming message.
> Checked by AVG Free Edition.
> Version: 7.5.446 / Virus Database: 268.18.6/708 - Release Date: 3/2/2007
> 4:19 PM
>
>
>
> ___
> Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp
> to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net
> Post photos, introductions, and For Sale items to 
> http://www.kr2forum.com/phpBB2/index.php
> please see other KRnet info at http://www.krnet.org/info.html
>
>
> 

KR> antennae tuning

[PHILLIP MATHESON]

To save all the stuffing around, have a look at the Antennae I got from 
Microair.
Airkit GI. to suit glass , timber airframe.


http://www.microair.com.au/index.aspx?page=186=4=Accessories

or

http://www.microair.com.au

and look under the Accessories link on the left side.
It work great. I can pick and talk from over 25km away from inside my steal 
workshop.
Phil Matheson
VH-PKR
Australia
KR Web Page
www.philskr2.50megs.com
http://www.vw-engines.com/