Groundplane? - Page 2 - Fiberglass RV


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Old 04-02-2008, 07:01 PM   #15
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"I want to eventually put in a HAM setup in my camper to help with search and rescue stuff when I am "out of county"..."

Just don't get bitten by the Ham Bug as bad as me, otherwise your dinette table
will look like this...
Attachment 12444

Next to Camping, Ham Radio is the best hobby I've ever found... fun and a valuable community service.
ConwayBob KI4HEE
Hey Bob,

Wish me luck. Taking the exam a week from Monday.
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Old 04-02-2008, 07:12 PM   #16
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Hey Bob,

Wish me luck. Taking the exam a week from Monday.
Good Luck & God Bless Byron!

If you'd like to do some tune-up practice tests, go to www.QRZ.com and have at 'em. They give you multiple-guess questions straight out of the real question pool, keep a running tally score, and give instant correct answers on any you miss. All online in your browser. You do it enough times you'll pass Tech, General, or Extra easy.

Also, if you have any questions, I'll be happy to "Elmer". Just drop me a message, anytime.

'73 ConwayBob KI4HEE
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Old 04-02-2008, 07:33 PM   #17
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Byron,

The tests on qrz.com are really helpful. But the main thing is, if I can pass so can you! I had to memorize the questions because the rest is all greek to me! I'm thinking of testing the next level up just so I won't accidently wind up on the wrong frequencies.

Then we can both be on the way to Bob's dinette setup!

Bob, how many pounds do you think you have in there? I'll have to leave my dog at home with that much!

Good luck Byron!

Paula
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Old 04-02-2008, 07:55 PM   #18
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Byron
Good Luck
I agree that if you take the onlne tests until you are getting 90% correct,it will be a breeze taking the test.
They use the actual questions online and they are the exact same ones that are in the test.

Have fun
73
Ed
KC0UKR

This is one of my Portable Field Stations with its own Battery Power.
This is my other hobby too,one of them.
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Old 04-02-2008, 08:09 PM   #19
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"...Bob, how many pounds do you think you have in there? I'll have to leave my dog at home with that much!"

I'm guessing I have about 30 lbs of radios & gear and about as much in power supplies. The gear I don't want tossed around I carry in the pick-up. Antenna coax cable gets stowed under the street side dinette seat.
Heavy gear like my generator, my antenna mast base, & other camp gear gets hauled in the pick-up.

Buddy rides shotgun in the truckcab

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Old 04-02-2008, 08:15 PM   #20
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"...This is one of my Portable Field Stations with its own Battery Power.
This is my other hobby too,one of them."

Ed, Thats a great looking set-up...and I love the buddi-pole! I'll someday have one...or a "suitable subsitute"!

ConwayBob
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Old 04-02-2008, 08:30 PM   #21
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Thanks all for encouragement. I don't really think the exam will be a problem. All the technical stuff is easy. I've got ARRL license book and never bothered to even read the technial stuff. Most of what I have to remember is band vs frequency stuff, some operation conventions, and a bit FCC rules. I've been taking the online tests at eham.net. Usually miss one or two questions. The other thing going for me is it's multiple guess type.

I'll let you all know what happens.
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Old 04-02-2008, 08:34 PM   #22
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Quote:
Good Luck & God Bless Byron!

If you'd like to do some tune-up practice tests, go to www.QRZ.com and have at 'em. They give you multiple-guess questions straight out of the real question pool, keep a running tally score, and give instant correct answers on any you miss. All online in your browser. You do it enough times you'll pass Tech, General, or Extra easy.

Also, if you have any questions, I'll be happy to "Elmer". Just drop me a message, anytime.

'73 ConwayBob KI4HEE
With just a bit more study I could probably pass the General test. But at this time I'm only interesting in the high frequency stuff. Mostly handheld.

Thanks for the offer the "Elmer". If I fail the exam I might need it.

73

x7xxx

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Old 04-02-2008, 09:00 PM   #23
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With just a bit more study I could probably pass the General test. But at this time I'm only interesting in the high frequency stuff. Mostly handheld.

Thanks for the offer the "Elmer". If I fail the exam I might need it.

73

x7xxx
You threw me with the "high frequency stuff"...sorry, I figgered out you're talking about 6M, 2M, 440, ect. Cool. But work on doing General anyway...

Here's what you do... goto QRZ.com and take the Tech test...if you can do 80% no problem, start doing the General test too...do it a few times, then do a Tech test again, as a tune up. Keep doing the General test and the Tech test. Don't spend a lot of time at this, just make a game of it...keep trying to top your personal best. In a week, you'll be aceing both, I gauarantee it.

Here's the reason I'm telling you this... I'm a VE, a volunteer examiner. When you pass the Tech test, you're welcome to take the General test immediately. If you pass that, you can take the Extra exam. You pay a proctors fee before you test, but as long as you pass, you can take as many tests as you want. At our last session we had two guys walk in with no license and walk out as Extra Class Operators.

Go to QRZ.com...start practicing NOW.

ConwayBob

PS, get you're Tech ticket and download echolink, I'll be happy to work a sked with you over the net anytime. Get your General and I'll work you over any band that's open.
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Old 04-03-2008, 10:01 AM   #24
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Getting back to the topic at hand, Per, in your case most car antennas do use the car body as a "groundplane" or more accurately as a "counterpose". In some cases, coax antenna shielding that's grounded at the radio acts as the other "half" of the antenna. I don't know about fiberglass bodied cars like the Corvette but there is at least some "ground" involved, the car frame, door posts, ect., to act as counterpose. If you are using a car antenna, try to mount it to any metal part of the trailer or get a ground wire to where you have it mounted.

A easier solution is a cheap dipole antenna which dosen't require a counterpose.
A dipole antenna like this or this should do the trick.

Incidentally, fiberglass is "invisible" to most radio waves. A fiberglass "whip" Antenna is usually just a wire running inside a fiberglass tube or a bit of wire glued the length of a fiberglass rod. What I'm getting at is if you strung a dipole from floor to ceiling say inside your closet, or along the length of a cupboard or overhead bin, you'll in effect have turned your Fiberglass Trailer into a fiberglass dipole antenna that can sleep 4!

I'll see you on the radio,
ConwayBob
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Old 04-03-2008, 10:42 AM   #25
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Getting back to the topic at hand, Per, in your case most car antennas do use the car body as a "groundplane" or more accurately as a "counterpose". In some cases, coax antenna shielding that's grounded at the radio acts as the other "half" of the antenna. I don't know about fiberglass bodied cars like the Corvette but there is at least some "ground" involved, the car frame, door posts, ect., to act as counterpose. If you are using a car antenna, try to mount it to any metal part of the trailer or get a ground wire to where you have it mounted.

A easier solution is a cheap dipole antenna which dosen't require a counterpose.
A dipole antenna like this or this should do the trick.

Incidentally, fiberglass is "invisible" to most radio waves. A fiberglass "whip" Antenna is usually just a wire running inside a fiberglass tube or a bit of wire glued the length of a fiberglass rod. What I'm getting at is if you strung a dipole from floor to ceiling say inside your closet, or along the length of a cupboard or overhead bin, you'll in effect have turned your Fiberglass Trailer into a fiberglass dipole antenna that can sleep 4!

I'll see you on the radio,
ConwayBob
The only issue with this is the Reflectix insulation between the Rat Fur and the Fiberglass I would think.
I have used inside antenna' in my eggs so far but the newer Scamp is challenged because of the Reflectix it seems.
It truly insulates including R.F.

Also Bob,I found the BuddiPole used on QTH and just like the Fiberglass Here you have to be ready to pull the trigger the moment you see a used one because the next guy sure will.
I first saw them and met W3FF at Dayton a few years ago and the quality is very nice.
I also have a Super Antenna MP-! which works well and he makes a DiPole version of that also.
To me though the issues I have with both of them are the coils.The Budipole clip system seems very fragile and about to break at any time and the MP-1 "screwdriver" like coil is not much better.

They are unbeatable for portability though.

73
Ed
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Old 04-03-2008, 11:38 AM   #26
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Having worked inside RF proff rooms off and on for many years (Many were walk in freezers with metal walls and brass/copper fingers around the doors) with all outside connections going through an extensive filter system we found this out.

At the North Dakota Stanley Mickleson Anti Ballistic Missile site we wanted to put a cable TV in the room so we drilled 1 hole small enough so a coax would just fit and after we drilled the hole and B4 we inserted the coax, we got the local radio station.
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Old 04-03-2008, 08:53 PM   #27
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I forgot about the reflectix insulation...my Scamp is pre-ratfur, reflectix sure would block things a bit. I've seen a Miami FL TV station use chickenwire built completely around the studio, to act like a faraday cage, worked real well too.

About the Buddi-pole...There was a guy selling a Buddi-pole at the Charleston SC Hamfest...wanting $300 bills for the complete set-up...I'm sure he got it too. I've seen Buddi-pole copycats for sale and homebrewed stuff using those big MFJ telescoping whips and home wrapped coils. Looks like a pretty cool project. Someday I'll win a lottery and get one of those MFJ antenna analyzers... there'll be no stopping me then.

Meanwhile, I throw my Carolina Windom wire antenna up between two trees to get out.

"73" ConwayBob
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Old 04-03-2008, 09:05 PM   #28
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"At the North Dakota Stanley Mickleson Anti Ballistic Missile site we wanted to put a cable TV in the room so we drilled 1 hole small enough so a coax would just fit and after we drilled the hole and B4 we inserted the coax, we got the local radio station."

That's so cool! It's amazing the magic of radio and how anything can serve as a antenna. Stories of people hearing radio signals coming from dentalwork are true too! The first place I owned was a mobile home parked close to the local Radio Station. One day I heard the local station clear as day coming out of my window air conditioner. Cool sounds comming out of a cool AC!

ConwayBob
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