More than one antenna?

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djhubbalubba
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More than one antenna?

Post by djhubbalubba »

Hi :)
Can I use more than one antenna to my transmitter system (max pro 3 and 40w amp)

Whats best solution to get better range? I use a High-Gain Vertical Half Wave antenna now with this spec:

4.2dB gain over a dipole aerial!
Narrow and Low radiation angle!
SWR better than 1.5:1
Reduces risk of TVI!
4 MHz RF Bandwidth
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Post by pcs »

In your case sensible thing to do would be either to mount
antenna higher or use more power (~150W for 2x more range).

The other way would be to use multi-bay antenna but that'd
be quite an investment as you'd need 6-8 to make a big
improvement.

Marko
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Low Power Radio Guy
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Post by Low Power Radio Guy »

Marko is right, and in case you were wondering, I looked this up once and, while it can be done, there's a lot of math

Here's the info:

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Post by djhubbalubba »

If I change antenna? Can I get more range?
Is a tuned dipole better than vertical half wave antenna?

I have 40 Watt now, and thats max for what I can use.
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Post by pcs »

You can't get more omnidirectional range with a single antenna of any kind.

You could get more range by using really lots of dipoles, as I originally
suggested.

These antennas would work better, too:
http://www.pcs-electronics.com/high-gai ... -1262.html

Of course you need at least 3 of these, better yet 4, to get circular coverage and gain.
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Marko - PCS Electronics
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Post by djhubbalubba »

Okei, thanks for answers :)

Maybe I can put up my old transmitter another place and let it recive signal from the new transmitter :)
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Post by pcs »

Sure, but it will have to be on another frequency, if the
signals overlap.
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Post by djhubbalubba »

Yep :)

And to all readers of the forum; you can tune in RadioLive on internet if you want to listen to us :)

See my signature :)
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Post by djhubbalubba »

I put this here:

I look at my SWR meter today, and I wonder, how many watts output I have? I dont think I can read the swr meter correctly :(

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Post by pcs »

Looks like a cheap CB wattmeter, its hard to say whether reading is correct.
Also, note that with a swr significantly from 1:1 the power reading becomes
less and less accurate.
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Post by djhubbalubba »

How can i get lower SWR?

Change frequency?

The antenne is tuned to 100.8MHz but the bandwidth is plus/minus 2 MHz from the centre frequency, and i transmit @ 99.6MHz
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Post by pcs »

Tune antenna to 100.8 :)

Depending on the quality of swr meter its reading could be off as well.
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