Richard Clark wrote:

wrote:
I forgot to ask

:-)

Richard, I am really glad that you are so omnipotent
and omniscient that you never make a mistake of
commission or omission. I, OTOH, make a lot of them.
--
73, Cecil http://www.qsl.net/w5dxp



-----= Posted via Newsfeeds.Com, Uncensored Usenet News =-----
http://www.newsfeeds.com - The #1 Newsgroup Service in the World!
-----== Over 100,000 Newsgroups - 19 Different Servers! =-----

"Richard" wrote in message ...
"J. McLaughlin" wrote in message
...
Dear Richard - no full name - no call - no location - probably not a
real E-mail address:

Let me see if I understand: You have the strange idea that someone
who has the experience and skill to craft for you an expensive design
(for free) is looking for something to do. Strange indeed.
Mac N8TT
--
J. Mc Laughlin - Michigan USA
Home:


I bought some "models" from Mr Cebik.

This is what he says in his notes:

" Although many of the designs may be directly built from the models in this
collection, the models themselves are for study purposes. Perfecting the
design to a level that permits construction of an antenna that is both
electrically and mechanically sound is your responsibility.

L. B. Cebik, W4RNL"

This is my problem and what I was asking for. I can mess around with the
models quite freely, but perfecting the design to a level that is both
electrically and mechanically sound is right now beyond me. What you are
saying is that this task is such a huge one and requires great skill. Not
easy then for your regular Joe ham to do much with the models in a practical
way. He/she has to become something of an antenna buff for that to
transpire. And because the task is so demanding, no antenna buff would ever
consider producing an actual contstruction design for anyone, apart from
him/herself maybe. And then he/she might condescend to allow others to
copy his/her design.

Pore deprived thing.

You study some of the mountain of illustrated artcles in the ham
literature which show how others have sucessfully put VHF Yagis
together to get an education on the various "basement engineering"
practical mechanicals they came up with.

You run the model based on the materials you have available and the
construction scheme you have chosen.

You build it. You test it. You tweak it. You put it up again and go
SWLing on
162 Mhz.

No, you don't have to be an "antenna buff" to do any of it these days.

But if you build your own you do have to get off your butt and put a
bit of your own mental effort into the matter. Don't hold your breath
while hoping that somebody around here will save you from the
butt-lift maneuver just because you don't wanna do it yourself.

w3rv

Dear Cec,
Tell you what (an English coloquialism), YOU provide all the information
you need to do the calculations and thereby provide some answers. Typical
results under typical conditions, plus or minus 15 percent is all that's
needed.

If you prefer it that way, you can even invent your own questions.
===
Reg, G4FGQ

By the way, I'm on Blue Nun Merlot tonight. Which is nicely appropriate now
that Bush and Blair have belatedly come round to the French (and the rest of
the World's) point of view. Vive L'entente Cordiale.

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

"Cecil Moore" wrote in message
...
Richard Clark wrote:

wrote:
I forgot to ask

:-)

Richard, I am really glad that you are so omnipotent
and omniscient that you never make a mistake of
commission or omission. I, OTOH, make a lot of them.
--
73, Cecil http://www.qsl.net/w5dxp



-----= Posted via Newsfeeds.Com, Uncensored Usenet News =-----
http://www.newsfeeds.com - The #1 Newsgroup Service in the World!
-----== Over 100,000 Newsgroups - 19 Different Servers! =-----

Reg Edwards wrote:
Tell you what (an English coloquialism), YOU provide all the information
you need to do the calculations and thereby provide some answers. Typical
results under typical conditions, plus or minus 15 percent is all that's
needed.

Reg, the question (assertion) was yours. Now you have to defend it by
furnishing the impedance looking back toward the source and the impedance
looking toward the load. I can tell you what it is in my antenna system,
but not yours or anyone else's. In my system, the impedance looking back
toward the source is very low. The impedance looking toward the load is
between 25 ohms and 100 ohms. That's an ideal application for a balun.

By the way, I'm on Blue Nun Merlot tonight.

I just finished off 5 liters of Almaden Cabernet Sauvignon. All I
have left in this dry county is Coor's light and Bella Sera Merlot.
That Italian wine is not as good as it used to be. They must have
changed from wooden barrels to mass produced metal vats.
--
73, Cecil http://www.qsl.net/w5dxp



-----= Posted via Newsfeeds.Com, Uncensored Usenet News =-----
http://www.newsfeeds.com - The #1 Newsgroup Service in the World!
-----== Over 100,000 Newsgroups - 19 Different Servers! =-----

Richard wrote:

I don't know whether I've got the know-how or the time to design a homebrew
VHF yagi for the marine band.

So, is anyone out there interested in providing a service to all marine band
DXers/eavesdroppers of designing and producing *full constructional notes*
on a range of marine antennas, and then putting the designs up on a website.

All antennas shall principally be for reception.

All antennas should be described as covering 156-162Mhz.

As far as the yagis are concerned, they should range from 2 to 6 elements.

All yagis shall have 4mm (or 3/16") diameter parasitic elements.

All parasitic elements shall be secured to boom by nylon rivets as per
G3SEK's notes at:
http://www.ifwtech.co.uk/g3sek/diy-yagi/#Construction

All booms shall consist of either 20mm or 15mm square tubing.

The DE for all yagis shall be 8mm (or 5/16").

The DE for all yagis shall be a regular hertz dipole.

There shall be some kind of balun.

Please, please!

There are half a jillion designs already out there. Also in books. All
designs can scaled to any other frequency. IE: any 2 meter VHF antenna
design can be easily scaled to 160 mhz. Why the rigid construction
requirements?
If you are scaling a design to another freq, you should also scale the
element dia. Luckily, there should be no need to change element diameter
for a rescaled 2m antenna, as it's already close enough. I once built a
marine band 4 element yagi from a thin copper tube as a boom, and
coathanger wire soldered to the boom as the elements. Not the greatest
materials, and it eventually rusted, but I could hear stuff that didn't
exist on verticals. I'm in Houston, and was listening to marine traffic
out towards Galveston, and the gulf. 50-60 plus miles easy... If you
have NBS designs, what are you waiting for? Those spacings are quite
good enough. They do lean towards max gain vs f/b, but you don't need
super f/b with what you are doing. So a NBS design should be fine. "the
f/b is still about 10 db" Thats what I used. My 6m beam is also a NBS
yagi. All my homebrew yagi's use a driven element grounded to the boom.
Also, I use gamma or T matches, etc...I rarely use a split driven
element insulated from the boom. It's more work, and I'm lazy...Only my
store bought "I didn't pay for it" HF beam is built that way. MK

--
http://web.wt.net/~nm5k

"Mark Keith" wrote in message ...

There are half a jillion designs already out there. Also in books. All
designs can scaled to any other frequency. IE: any 2 meter VHF antenna
design can be easily scaled to 160 mhz. Why the rigid construction
requirements?
If you are scaling a design to another freq, you should also scale the
element dia. Luckily, there should be no need to change element diameter
for a rescaled 2m antenna, as it's already close enough. I once built a
marine band 4 element yagi from a thin copper tube as a boom, and
coathanger wire soldered to the boom as the elements. Not the greatest
materials, and it eventually rusted, but I could hear stuff that didn't
exist on verticals. I'm in Houston, and was listening to marine traffic
out towards Galveston, and the gulf. 50-60 plus miles easy... If you
have NBS designs, what are you waiting for? Those spacings are quite
good enough. They do lean towards max gain vs f/b, but you don't need
super f/b with what you are doing. So a NBS design should be fine. "the
f/b is still about 10 db" Thats what I used. My 6m beam is also a NBS
yagi. All my homebrew yagi's use a driven element grounded to the boom.
Also, I use gamma or T matches, etc...I rarely use a split driven
element insulated from the boom. It's more work, and I'm lazy...Only my
store bought "I didn't pay for it" HF beam is built that way. MK

--
http://web.wt.net/~nm5k

Mark

If I am prepared to go with other peoples electrical and mechanical designs
then there is no doubt my task ought to be easy peasy. And as you say there
are zillions of designs out there already.There is a heck of a lot of sense
in taking that approach. :c)

It's perhaps unfortunate that I was started off by being given a model to
run in a program. This may have complicated the approch uneccessarily and
taken me away from what was the more sensible approach.

So obtaining software models and messing with antenna programs is perhaps
rather a redundant exercise.

Thanks for driving that home to me.

Rich

(Fractenna) wrote in message ...
Oh you got me! I've been caught out! I'm listening to the marine band. Shall
I expect the police at my door? Quickly I must hide my apperatus! I think
not.


I asked a reasonable question, and did not expect a sarcastic response.
Please: why is there a need, or an interest, to "eavesdrop" (using your
description) on the marine band with a high gain unidirectional antenna?

73,
Chip N1IR


Who are you to require an answer?

(Fractenna) wrote in message ...
So, is anyone out there interested in providing a service to all marine band
DXers/eavesdroppers

Why, exactly, is there a need to 'eavesdrop'? Who, in particular, are you
trying to 'eavesdrop' on? How many 'eavesdroppers' would seek such 'service'?

I am confused by your motivations and would be better enlightened with more
info in this regard. I ususpect I am not alone in this confusion.

Many thanks,

73,
Chip N1IR

What's it to you? It's perfectly legal. What more do you need to know, and why?

Surely you realize that there are people that listen to things on radio.
Shortwave, VHF, UHF. Military comms, utilities, ect. You do actually
participate in the radio hobby, don't you?

"Fractenna" wrote in message
...
Oh you got me! I've been caught out! I'm listening to the marine band.
Shall
I expect the police at my door? Quickly I must hide my apperatus! I think
not.


I asked a reasonable question, and did not expect a sarcastic response.
Please: why is there a need, or an interest, to "eavesdrop" (using your
description) on the marine band with a high gain unidirectional antenna?

73,
Chip N1IR

Who are you to require an answer?


I am Chip, N1IR.

I don't require an answer. I invited one.

Who, sir, are you?

73,
Chip N1IR