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311 posts

Ultimate Geek
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Topic # 113865 30-Jan-2013 14:13
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Hey guys.

After playing around with our car stereo, I've decided I want to start looking into getting a DX Setup in the house.

Question is What type of Antenna do I need?

We are located in Henderson Valley, Waitakere and where we are for whatever reason, in the car we can receive a number of stations located outside of Auckland. For Example Classic Hits, from Whangarei, Hamilton, and Gold FM from the Coromandel, and Times FM from Rodney, and Many others.

The question is, almost none of them are receivable in the house, (Sometimes I get traces if I point the wire in the right direction) I'm putting it down to the fact that the Antenna wire is no where near strong enough to pick it up, since the transmitters are so far off.

We also can pick up quite clearly about 5-10km down the road, is Classic Hits from Taranaki, but I can't pick up a sniff of the signal at home, even with the car radio.

My ultimate goal is to pick this up at home.


So, I've decided to put some of my money together, and invest in a Roof Antenna setup for the sole purpose of FM Dxing.

The question is that since I am relatively new to the subject of FM dxing, I have no idea where to start looking for a decent Antenna for that purpose.

I want to keep my budget under $100 if possible.

I was looking at this one here. I was keen on this one. http://www.trademe.co.nz/electronics-photography/tvs/cables-aerials/auction-548636308.htm

However, it will still need to be pointed in the right direction and there's no point really if I have to climb on the roof to change the direction of the antenna, every time when f I want to pick up a signal in the opposite direction.

I was reading more on this, and I found this seller from the USA. http://www.fmdxantenna.com/proddetail.php?prod=FMDipUS#.UQh0zme5z1s

This one also looks like a good option, even if it gets shipped from the USA, it's still cheaper then trademe, if it works better. I'm just not sure on that one, because it looks smaller then the 5 element one.

Hope somebody can help me.

Thanks

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Uber Geek
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  Reply # 753276 30-Jan-2013 14:15
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Do you have a VHF antenna already on your roof?  Tried that?  I get brilliant FM reception from mine.



311 posts

Ultimate Geek
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  Reply # 753281 30-Jan-2013 14:22
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ubergeeknz: Do you have a VHF antenna already on your roof?  Tried that?  I get brilliant FM reception from mine.


Unfortunately not, however I haven't ruled out buying one, because with all Freeview HD stuff on UHF, I'm sure many people have spare VHF antennas lying around.

 
 
 
 


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Uber Geek
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  Reply # 753322 30-Jan-2013 15:27
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ubergeeknz: Do you have a VHF antenna already on your roof?  Tried that?  I get brilliant FM reception from mine.


A VHF TV antenna is not ideal for FM Radio but just a compromise.
The ones shown on Trademe are purpose built for FM band Radio (88 - 108mhz) and the prices are reasonable. You'd be hard pushed to make your own for much less. Note also that FM polarisation is slant (45 degrees, right side down left side up from the back of the antenna looking at the transmitter) and neither vertical nor horizontal.
If you are really serious about FM DX then you would need a rotator.
See here
http://www.comcentre.co.nz/Amateur_Antennas.php
The G-250 is a TV antenna type rotator and would work fine although it is rather expensive and also no longer manufactured.
I have one I use for VHF (5 element 50mhz beam) and it works well.
The current price is nearly double what I paid for mine about 8 yrs ago.
The next model up (G-450) is not much more expensive and would handle much bigger antennas and wind loads. They can be purchased from USA suppliers for about half the local price.



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