antenna question for you hams
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antenna question for you hams
Post by dime196604 »
Can I convert them to 2m? I know I would have to add length to them but I do not know what section to lengthen, if is even possible.
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Re: antenna question for you hams
Post by North Texas Mudduck »
what kind of antennas are they ?
name model?
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Re: antenna question for you hams
Post by dime196604 »
They are antennx, a four element colinear array, it like four lengths of coax inside a PVC pipe, each peace of coax attaches to the next from the center to shieldNorth Texas Mudduck wrote:im no ham yet
what kind of antennas are they ?
name model?
Re: antenna question for you hams
Post by 'Doc »
One common way of doing that sort of thingy, using a commercially made antenna not made for the ham bands, is to just put-up with the mismatch and use it. Depending on the 'gain' of the antenna the mismatch losses are sort of 'canceled out'...
Good luck.
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Re: antenna question for you hams
Post by Island_0860 »
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Re: antenna question for you hams
Post by Savoirfaire »
Second try and find a 2 meter antenna tuner.
73, Frank 10 X-Ray 47 (SSB)
N4SLR (Amateur)
Re: antenna question for you hams
Post by Flapjack »
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Re: antenna question for you hams
Post by North Texas Mudduck »
http://search.yahoo.com/searc ... 20antennas
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Re: antenna question for you hams
Post by 721HACKSAW »
As 860 posted, having an analyzer such as the MFJ 259 can help tremendously.
Re: antenna question for you hams
Post by Flapjack »
Yep, like how to replace the finals in your transmitter, and how much time and money you could have saved just buying a good beam antenna.ch17Critter wrote:Or go for it.....what's to lose? They were free and the worst that can happen is they dont work but you LEARN something in process.
Sun Apr 21, 2013 4:43 pm
You would have to lengthen all of them. The radiating element is the second longest element. The longest would be the reflector. All of the others would be directors, and they would all require lengthening. Good luck on your project if you choose to go that way.dime196604 wrote:I just got my tech license a week ago. So I am gonna start using some of the ham frequencies. My question is this. My brother in law works for the city, the public safety building just upgraded all of their stuff so now I have 2 151mhz collinear antennas, they are about eight feet tall. I have opened them up and the innards are easy to get to and I have easy access to all the solder points.
Can I convert them to 2m? I know I would have to add length to them but I do not know what section to lengthen, if is even possible.
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Re: antenna question for you hams
Post by dime196604 »
It a omni, vertical not a beam. Its got four elements hook end to end. Its a four element colinearFlapjack wrote:You would have to lengthen all of them. The radiating element is the second longest element. The longest would be the reflector. All of the others would be directors, and they would all require lengthening. Good luck on your project if you choose to go that way.
Re: antenna question for you hams
Post by Flapjack »
Whoops my bad I thought a four element co-linear was dual or stacked Yagis. google.com/search?q=collinear+antennadime196604 wrote:It a omni, vertical not a beam. Its got four elements hook end to end. Its a four element colinearFlapjack wrote:You would have to lengthen all of them. The radiating element is the second longest element. The longest would be the reflector. All of the others would be directors, and they would all require lengthening. Good luck on your project if you choose to go that way.
hamuniverse.com/w7lpnCollinear002.pdf
It could be very do able. Very precise measurement are required.
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Re: antenna question for you hams
"LISTEN FOR THE PING"
Kenwood TS-590S - Yaesu FT897D - Kenwood TS-870 - Icom IC-7300
Yaesu FT-101E - Tram D201A - President Lincoln - CP2000
Gizmotchy G-31 Beam
Super Penetrator 500 5/8 Wave
Comet GP9 2 meter/440
"North East Corner Of Massachusetts 613"
CBRT 18204
Re: antenna question for you hams
Post by ch17Critter »
ch17Critter wrote:Or go for it.....what's to lose? They were free and the worst that can happen is they dont work but you LEARN something in process.
Flapjack wrote:Yep, like how to replace the finals in your transmitter, and how much time and money you could have saved just buying a good beam antenna.
Sun Apr 21, 2013 4:43 pm
Ever hear of an analyzer? Guess trying something is just out of the question. Huh....who knew?
Critter
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Re: antenna question for you hams
Post by dime196604 »
its very cheap and easy to make a beam for 2m as well. I just wanted to know if it was possible since i have 2 and they are well maid and free, and i was reading that vertical colinears have a decent about of gaindirtyjob wrote:if you must Finangle something out of what you have then go for it but where 2 meter antenna's are prolly the cheapest antenna's out there , i'de simply buy one.
Sun Apr 21, 2013 8:16 pm
I am thinking of making the tape measure beam since i have everything needed to make it
Re: antenna question for you hams
Post by ch17Critter »
Will it be easy? Depends on the person I guess but in no way do you need to be an EE to do this if you can get the thing apart as easy as you say. There are many places online for calculations and tips on building antennas.....just not as easy to find as posts saying it's next to impossible.
Have fun...learn something.....win win
Critter
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Re: antenna question for you hams
dime196604 wrote:its very cheap and easy to make a beam for 2m as well. I just wanted to know if it was possible since i have 2 and they are well maid and free, and i was reading that vertical colinears have a decent about of gaindirtyjob wrote:if you must Finangle something out of what you have then go for it but where 2 meter antenna's are prolly the cheapest antenna's out there , i'de simply buy one.
Sun Apr 21, 2013 8:16 pm
I am thinking of making the tape measure beam since i have everything needed to make it
sure thing, there are many many inexpensive plans to be had making antennas and 2 meter antennas are very dirt cheap to make, i run a jpole made from copper pipe, cost 20 bucks to make, hits repeaters 60 miles away and only 20 feet off the ground.
"LISTEN FOR THE PING"
Kenwood TS-590S - Yaesu FT897D - Kenwood TS-870 - Icom IC-7300
Yaesu FT-101E - Tram D201A - President Lincoln - CP2000
Gizmotchy G-31 Beam
Super Penetrator 500 5/8 Wave
Comet GP9 2 meter/440
"North East Corner Of Massachusetts 613"
CBRT 18204
Re: antenna question for you hams
Post by 231 »
Enjoy and let us know how it goes.
231
Re: antenna question for you hams
Post by Flapjack »
Analyzers are great if you can afford them. I have several. I have a HP spectrum analyzer cost over $7000.00 new. I also have multiple Antenna analyzers One for the 160 through 6 meter range and one for 2 meters and up. Field strength meters are a good way to tune them up as well and you can also map out your radiation patterns of the antennas. I was just sayin many people are not that technically inclined or have so much money invested in test equipment as I/we do. Some times it is just better to buy one instead of modifying an item made for something else.ch17Critter wrote: Ever hear of an analyzer? Guess trying something is just out of the question. Huh....who knew?
Critter
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Re: antenna question for you hams
Post by MDYoungblood »
3's
Greg
Re: antenna question for you hams
Post by ch17Critter »
Noted.Flapjack wrote:Analyzers are great if you can afford them. I have several. I have a HP spectrum analyzer cost over $7000.00 new. I also have multiple Antenna analyzers One for the 160 through 6 meter range and one for 2 meters and up. Field strength meters are a good way to tune them up as well and you can also map out your radiation patterns of the antennas. I was just sayin many people are not that technically inclined or have so much money invested in test equipment as I/we do. Some times it is just better to buy one instead of modifying an item made for something else.ch17Critter wrote: Ever hear of an analyzer? Guess trying something is just out of the question. Huh....who knew?
Critter
My point is....why discourage a chance to learn something? The job of converting that antenna he has is, I admit, a more challenging project for a first timer but far from something needing to be an EE. Nor would it have to an expensive project....whats the most he could lose here? 10 bucks?
Any chance to learn something is well worth the effort.
Critter
Re: antenna question for you hams
Post by Flapjack »
If you don't have a real solid grasp of how radio frequencies act and react the project could be too technical for some people. The absolute last thing I would ever do is discourage a person from learning something new. But I also would caution them about getting in over their heads technically. The finals in good quality ham equipment can be expensive. I know EE's that could not handle that project. I had several working for me that could not do that project. They were competent in the projects that I hired them for but not much else. All I can do is put my opinion out there and they can choose to take my advice or not. Can we still be buddies?ch17Critter wrote:My point is....why discourage a chance to learn something? The job of converting that antenna he has is, I admit, a more challenging project for a first timer but far from something needing to be an EE. Nor would it have to an expensive project....whats the most he could lose here? 10 bucks?
Any chance to learn something is well worth the effort.
Critter
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Re: antenna question for you hams
good luck.
If you can't find directions PM me I'm sure I can find one.
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Re: antenna question for you hams
Post by dime196604 »
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