KR> antennas

[Glenn Martin]

David Lininger wrote:
>
> Leave it to a ham to know antennas!
>
>
I AM seriously contemplating a pair of HF Screwdriver antennas mounted 
in a fairing under  the belly (as a dipole). Mobile airborne!.  I 
already have the D-star HT.

-- 
Glenn Martin
KR2 N1333a
N5PQ
Biloxi, MS, 39532
rep...@martekmississippi.com

KR> copper foil antenna

[Mark Langford]

Paul Smith wrote:

> Hey Mark, I too need to add the antenna to a finished fin. Your thoughts 
> on either sticking directly onto the leading edge and glassing or pushing 
> a copper rod through the foam inside the fin?

That's basically what I did, shown in the top photo at 
http://home.hiwaay.net/~langford/antennas.html , except I didn't put it on 
the leading edge because I'd already "achieved perfection" on the leading 
edge and wasn't sure the copper tape would conform to the leading edge long 
enough for the glass to cure, so I stuck it to the side.  I can now say that 
it works fine like it is.  I would think a copper rod would be rather heavy, 
but that'd work.

Mark Langford
N56ML "at" hiwaay.net
website at http://www.N56ML.com
 

KR> Bazooka antenna measurements

[Glenn Martin]

thomas.garne...@comcast.net wrote:
> As for the vertical bazooka antenna that you find the formulas for at the web 
> site given, the length for around 120 megahertz would be slightly longer than 
> five feet. It would be to long to install in the vertical stabilizer, without 
> the plastic pipe extending 15 or 16" above the rudder.
>
>   
Calculated correctly at 120MHz using RG-8 (Velocity factor =.66) (from 
the FEED POINT, which is the center of the dipole antenna) the top half 
of the antenna is 62.5 cm long (24.76") and the bottom half (the folded 
back braid which also acts as the balun) is 41.25cm (16.24").

The top half would extend into the vertical stabilizer (easily enough 
room), the bottom half is in the boat. Both sections would fit easily. 
The rest of the measurements in the article are simply how the author 
MOUNTED the antenna and can be disregarded for our purposes, as anything 
below the bottom of the braid is simply transmission line. Therefore, 
anything below the bottom of the braid  can be routed as needed to fit 
the KR2, (just so long as there are no SHARP bends in the transmission 
line). The radius of all bends in the coaxial cable  for routing should 
be approx 5  times the outer diameter of the coaxial cable used  (or 
more) to keep losses to a minimum.
The balun  helps match the antenna to the tcoaxial cable and reduces 
radiation from the cable itself, which improves both transmission AND 
reception.
RG-8 is good for use at VHF frequencies

Cable facts:
RG8 (Beldin 9913) would produce about  a 9% loss in Transmitted and 
Received signal strength at 20 foot length
RG58/u (Beldin 8240) would produce about  a 18% loss in Transmitted and 
Received signal strength at 20 foot length
LMR600 would produce about  a 4.5 % loss in Transmitted and Received 
signal strength at 20 foot length





-- 
Glenn Martin
KR2N1333A
N5PQ
13238 Hudson-Krohn Rd
Biloxi, MS, 39532
rep...@martekmississippi.com

KR> (no subject)

[pk.sm...@bigpond.net.au]

Hey Mark, I too need to add the antenna to a finished fin. Your thoughts on 
either sticking directly onto the leading edge and glassing or pushing a copper 
rod through the foam inside the fin?

Paul Smith
Brisbane Australia.

 Mark Langford  wrote: 

so I had to stick it on the front of the vertical stabilizer and add another of 
glass to 
keep it there.  

KR> comm antenna support

[Pete Klapp]

Netters

I found something that I can use for the lower half of my comm dipole. I 
checked numerous archery and hobby shops and no one carries fiberglas arrow 
shafts anymore, only graphite or carbon fiber. Wicks showed it in their 2009 
catalog, but have since dropped it from their inventory. But I found that 
Wiremold makes a plastic version of their surface mounted conduit system called 
Cordmate. Has approx a 3/8" ID with a wall thickness of about 0.030" and snaps 
closed length-wise making it easy to install the copper foil. Looks like it 
could also be used as a wire loom through the cockpit area, keeping things 
neat. Found it at Home Depot's electrical dept at less than $5 for a 5' stick. 
Hopefully, this might be helpful to other builders.

Pete Klapp, building KR-2S N729PK,

Canton, Ohio

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KR> 2010 KR Gathering date

[Mark Jones]

Let the countdown begin...218 days till KR bliss.


Mark Jones (N886MJ)
Stevens Point, WI
E-mail: flyk...@charter.net
Web: www.flykr2s.com

- Original Message - 
From: "Dana Overall" 
To: 
Sent: Wednesday, February 03, 2010 2:45 PM
Subject: KR> 2010 KR Gathering date



I been able to finalize the date for this years National KR Gathering.  The 
Friday, Saturday and Sunday dates will be September 10,11 and 12 at 
Richmond/Madison Kentucky airport, i39.  I will be posting the phone number 
for the primary hotel very shortly.  There will be camping allowed, not 
nearly as nice as the lake at Mt. Vernon, with hangar bathroom access.  Plan 
on having lunch catered Saturday along with the banquet Saturday evening.  I 
will be asking for people to buy tickets to each one separately as the time 
grows closer so I can give the caterer a good number.  It looks like the 
hotel in Mt. Vernon used about 20 rooms from the reserved block so I am 
going with the same number.

Hey, Jones...how many days until the gathering??

Dana Overall
1999 & 2000 National KR Gathering host
Richmond, KY i39

http://rvflying.tripod.com/blackmagic.jpg
http://www.youtube.com/watch?v=MMi05-WU2D0#GU5U2spHI_4
http://rvflying.tripod.com

do not archive





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KR> Intake

[Dan Heath]

The mystery of why this intake did not work, has been solved.  The theory
behind it was that if fuel were allowed to condense on the walls of the tube
and run into the cylinders at random, in little puddles, that would make the
engine sputter badly from suddenly going rich.  This is true.  The solution
was to make the intake so that the puddles could not make it to the
cylinders.  The solution is the problem because the puddles then just
congregate in the lower part of the manifold and when the air flow is
increased such that it starts sucking up these accumulated puddles, the
engine goes way too rich.  An expensive experiment, but now I think I know
more about what works and what does not.  I am getting new bent tubes on
Friday, and will have a new intake to try very soon.  Who knows, I might
just make it to I39 this year.



Daniel R. Heath

da...@windstream.net

See N64KR at   http://KRBuilder.org - Then click on
the pics 

See you at the 2010 - KR Gathering in Richmond, Ky - I39

KR> Bazooka antenna

[thomas.garne...@comcast.net]

As for the vertical bazooka antenna that you find the formulas for at the web 
site given, the length for around 120 megahertz would be slightly longer than 
five feet. It would be to long to install in the vertical stabilizer, without 
the plastic pipe extending 15 or 16" above the rudder.
It could be installed midway between the seat and tail, but would still 
protrude above or below the body. It could be installed horizontally in the 
wing or horizontal. Stabilizer, but all FAA towers and com frequencies are 
vertical polarized. It might work ok, but vertical would be better. 
If you are an EAA member, you can look at several past antenna articles in 
Sport Aviation magazines.
Tom wb4ryr

KR> 2010 KR Gathering date

[Dana Overall]

I been able to finalize the date for this years National KR Gathering.  The 
Friday, Saturday and Sunday dates will be September 10,11 and 12 at 
Richmond/Madison Kentucky airport, i39.  I will be posting the phone number for 
the primary hotel very shortly.  There will be camping allowed, not nearly as 
nice as the lake at Mt. Vernon, with hangar bathroom access.  Plan on having 
lunch catered Saturday along with the banquet Saturday evening.  I will be 
asking for people to buy tickets to each one separately as the time grows 
closer so I can give the caterer a good number.  It looks like the hotel in Mt. 
Vernon used about 20 rooms from the reserved block so I am going with the same 
number.  

Hey, Jones...how many days until the gathering??

Dana Overall
1999 & 2000 National KR Gathering host 
Richmond, KY i39

http://rvflying.tripod.com/blackmagic.jpg
http://www.youtube.com/watch?v=MMi05-WU2D0#GU5U2spHI_4
http://rvflying.tripod.com

do not archive 





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KR> Re: KR - - - Vee-tailed KRs? Different airfoils ?

[Glenn Martin]

laser...@juno.com wrote:
>> Be advised I am in absolute awe of the expertise I am already  seeing 
>> 
> at/in this site!  The  writing is excellent:  like a breath of  fresh air
> . . .  
>   
Ah, the old Bait and Switch snags another one!

-- 
Glenn Martin
KR2 N1333A
13238 Hudson-Krohn Rd
Biloxi, MS, 39532
rep...@martekmississippi.com

KR> Shoulder Harness

[Teate, Stephen]

I will be installing my shoulder harnesses this weekend. They are the "H" type 
and my question is, where does the cross piece go? I have seen them in front 
across the chest and also just behind the neck. I can think of a couple of 
reasons for each location so maybe it doesn't matter but I want to be sure I am 
not overlooking something.

Thanks in advance,
Stephen Teate
Paradise, Texas

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KR> today's flight

[Peter Drake]

Mark

Here in the UK we have a "Cloud Appreciation Society", You should be a 
member!
Peter Drake

Mark wrote:

I flew a little today, and it was a real hoot.  See the top two pictures at
http://home.hiwaay.net/~langford/sunsets/



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KR> today's flight

[Fred Johnson]

Not fair! While some of us struggle to get our birds flyable, you are out
rubbing it in :o)

I showed this to guy t work here and he was, as I, very envious.

Fred Johnson
Reno, NV



Mark wrote:

I flew a little today, and it was a real hoot.  See the top two pictures at
http://home.hiwaay.net/~langford/sunsets/ 

KR> (no subject)

[Mark Langford]

Larry Howell wrote:

> You can sandwich the copper tape between a couple of layers of fiberglass 
> cloth, let them set up and then glue the rig in wherever you feel like.

Yep, I made one of those by duct taping a piece of wood and laying out some 
2" fiberglass tape on it, bent around the corners to form a little 
fiberglass angle, then after it cured I added the tape, then another layer 
of fiberglass tape.  That was pretty light too, but then I discovered the 
arrow shaft and how small and stiff it made the whole thing, I went that way 
instead.  For those who don't realize it yet, the best way (in my humble 
opinion) to do an antenna is to bury a copper tape on the vertical 
stabilizer spar starting at the very top and coming down to whatever the 
magic number is...roughly 20.3", then the connection to the coax, then run 
the other leg down until it hits the fuselage floor.  Mine is angled back to 
the rear to fit it in, and although it's surrounded by control cables and 
shoulder belt cables, I couldn't ask for better reception.  I forgot to 
stick mine to the spar before I foamed and glassed the vertical, so I had to 
stick it on the front of the vertical stabilizer and add another of glass to 
keep it there.  Just another in a long line of screwups!  See 
http://home.hiwaay.net/~langford/antennas.html for a few pictures.

Mark Langford
n5...@hiwaay.net
website www.n56ml.com 

KR>arrow shaft

[Dan Heath]

What about carbon fiber golf club shafts?

See N64KR at http://KRBuilder.org - Then click on the pics 
See you at the 2010 - KR Gathering in Richmond, Ky - I39
There is a time for building and a time for FLYING and the time for Flying
has begun.
Daniel R. Heath - Lexington, SC


-Original Message-

Google searches turn up a lot of 
fiberglass tubing used for RC model spars, so an RC model shop would be 
worth a call.