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Author Topic: Amplifier for 2m  (Read 2059 times)
KD7CGH
Member

Posts: 3




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« on: June 30, 2002, 05:48:40 PM »

I have a 2m antenna in my attic...in order to increase my transmitting area would using an amplifier be a good idea?  If so could anyone recomend one?  
I'm using a FT-2500M, Comet GP-6 antenna and an Astron ss-25m power supply.

Thanks
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KE4DRN
Member

Posts: 3746




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« Reply #1 on: June 30, 2002, 10:41:33 PM »

Hi Eric,

Can you post more info on your setup ?

What type coax and how long are you using ?

Are you able to hear other stations but can't reply
to them ?

How far away is the most distant station you can talk to ?

Have you tried other antenna ?

If you like to build, here is a link to an easy to make
2m antenna http://www.cebik.com/hs.html
or a 2m quad beam http://www.softcom.net/users/kd6dks/quad.html

73 james
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KD7CGH
Member

Posts: 3




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« Reply #2 on: June 30, 2002, 11:37:57 PM »

Can you post more info on your setup ?
   

What type coax and how long are you using ?
   I think it is R218 and it is 50 feet long

Are you able to hear other stations but can't reply
to them ?
    I can hear and reply

How far away is the most distant station you can talk to ?
    With simplex about 30-40 miles

Have you tried other antenna ?
     No

If you like to build, here is a link to an easy to make
2m antenna http://www.cebik.com/hs.html
or a 2m quad beam http://www.softcom.net/users/kd6dks/quad.html

73 james
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K1HC
Member

Posts: 59




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« Reply #3 on: July 01, 2002, 06:38:19 AM »

Take a look at the Product Review Section on here on EHam.net for users' comments on VHF amplifiers.  Some of the "brick" type (solid state) amplifiers have not had favorable reviews.  A better way to improve your signal at a lesser cost is to upgrade tour antenna. If you have a chimney, you could mount a vertically polarized yagi on a TV size rotor and then use good low loss coaxial cable as well.

73,

Dick, K1HC
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KG4RUL
Member

Posts: 3353


WWW

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« Reply #4 on: July 02, 2002, 07:52:47 PM »

I think the point of this thread is being missed.  I am assuming that an attic antenna is a necessity because of CC&Rs or toher restriction.  So, to build a beam to the specs from the web page which was listed would require a 7'Dia. area with 3'clearance to swing a beam.  A lot of attics, mine is a truss roof, can't accomodate anything even close to this size.  In fact, I a using a Ventenna currently.  I am also going to pursue an amplifier.

Dennis - KG4RUL
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KE4DRN
Member

Posts: 3746




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« Reply #5 on: July 03, 2002, 08:07:12 PM »

Good point, I too have restrictions in my area.

With his radio at full power 50W into the Comet
40-50 Miles simplex is good for vhf.

If that quad beam is built with all five elements,
you can have almost 11 units of gain.  Or you can
build it with less elements to fit it in the attic.

I have two in the attic, one for vertical and the other
for horizontal polarization.

Even a small purchased beam will direct most of the
signal to the desired area while the vertical with the amplifier will not.

Plus, you may be able to transmit further with the amp but will not be able to hear the replies unless the other station(s) are using an amp or directional antenna.

The quad beam can be built for under $15 but a large
amp for 2m can run over $ 200, would be a good experiment to try a directional antenna first.

73 james
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