Aerial positioning

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Aerial positioning

Postby alank950 » Wed Aug 16, 2017 5:30 pm

I will be erecting a Scanmaster B1300 outside and i was wondering if positioning this next to the house will make any difference as to putting it on the chimney?.I was going to erect it on either a clothes line pole or on a six foot fence post with a six foot extension bar and brackets.
I am also erecting a Nevada EFW1 long wire both these are going to my Kenwood R5000 receiver which is currently being serviced.Will positioning these close to each other cause any interference ,i am assuming not as they work two seperate signals?...
Kenwwod is fitted with the vc-20 vhf add-on and i hope to have an Inrad 6Khz AM filter added soon and possibly some SSB filters which i will be asking some advice and info on before looking into ....thanks
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Re: Aerial positioning

Postby m0lsx » Wed Aug 16, 2017 7:45 pm

Height is king on VHF & UHF. The higher the antenna the further away the horizon is & the fewer the obstructions.
VHF & UHF, unlike HF (Short Wave) is effected by buildings, trees, land rises etc.
However, keeping the coax as short as is reasonably possible & using decent coax. RG-213 as a minimum, especially if you are using a frequency above Civil Airband. All makes a difference.
So although height is king, don't add too much coax to get it.

As for your antennas being close togther, mine look like this..
Image
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Re: Aerial positioning

Postby alank950 » Thu Aug 17, 2017 9:56 am

Thanks
So putting the scanmaster B1300 for HF shortwave on the fence close to the house should be ok?..I am fitting the balun for the EFW1 longwire VHF/UHFon the top facia board of the house running it around the garden in a U shape ..
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Re: Aerial positioning

Postby m0lsx » Thu Aug 17, 2017 11:28 am

Both will be fine as you describe. The only issue will be height for the Discone. If you ave hedges, trees, buildings etc around you do not expect too much, especially at UHF. But a lower outdoor antenna will outperform an indoor antenna at a similar height.
We all do what we need to do antenna wise. Some are lucky, most of us not so lucky in various degrees.
For example I can put a antenna up, but I am in a significant dip, with the land rising well above my property height in all directions. So unless I put a massive mast up, I would not get over the land rise.
I also have properties all around me. Something you may wish to consider if you are going to listen to HF (Short Wave) As everything from LED light bulbs, to PC routing systems, to solar panel inverters & a whole raft of other things all produce electrical noise, which makes the HF unworkable in some locations.
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Re: Aerial positioning

Postby alank950 » Thu Aug 17, 2017 5:11 pm

Ok ,i am a little confused now as to what aerial plugs into what termaial..correct me if i am wrong...the scanmaster b1300 plugs into the vc-20 vhf add-on on the back of the set and the EFW1 long wire plugs into the bottom HF connector..Radio is the Kenwood R5000 with vc-20 vhf add on...
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Re: Aerial positioning

Postby m0lsx » Thu Aug 17, 2017 5:33 pm

Looking at the manual.
If using the VC-20. You use the antenna socket in the middle at the top of the R-5000.
The HF antenna will go to the connector in the middle at the bottom.
You may find that you will need a SWL or QRP ATU, as the antenna you are going to use will need tuning.
It's 3:1 in your manual & if you do not have a manual, which is page 9.
[url]
http://pdf.textfiles.com/manuals/SCANNE ... Manual.pdf[/url]
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Re: Aerial positioning

Postby alank950 » Thu Aug 17, 2017 6:07 pm

Currently looking a user manual ..
The QRP ATU i see on ebay .Would this do my job ebay item number 282275106352..Receive SPC Antenna Tuning Unit. Made in Dorset, UK. I will contact the seller for more info...Which input do i need to use this with vhf or HF?...forgive the newbie questions
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Re: Aerial positioning

Postby alank950 » Fri Aug 18, 2017 9:18 am

Can someone advise if this will do my job.. Howes CTU8 Receive Only ATU..can pick a used one up on ebay...
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Re: Aerial positioning

Postby alank950 » Fri Aug 18, 2017 1:19 pm

From what i can gather i will also need an earth rod ..will a length of bell wire do ok for connecting this to the tuner.According to the ebay seller the tuner unit i need is RX SPC ATU ..below is the message i got ..As i said i am completely new to this and welcome any information

The RX SPC ATU is the best one for a long wire because it copes properly when the antenna is too long to be a multiple of 1/4 wave at a particular frequency and when the wire is too short to be an odd multiple of a 1/4 wave.

The L-type ATU is optimised only for when a wire is too short at a particular frequency.
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Re: Aerial positioning

Postby m0lsx » Sun Aug 20, 2017 8:44 am

You do not NEED an earth rod, although feeding a long wire antenna against an earth rod is the best path, as it improves the sound to noise ratio in your favour.
Personally I always feed an outdoor wire against an earth rod, but it is not essential.
The Howes ATU is a good one.
I use two main SWL ATU's the best one is a Global AT-2000. It has adjustable Q & has pass band filtering. But it's not a good novice ATU. The Global is also sold under the Mizuho brand name.
What you do with a SWL ATU is tune for the loudest noise.
What is called a SWR Noise Bridge, can make a big difference to a SWL station, as it allows you to match an antenna with RF required. Some ATU's come with a noise bridge fitted.
The best type of ATU for a SWL is a balanced tuner. But as you have a Balun at the feed point of your antenna, you will not gain anything from that & with that balun you will, or you should gain the advantage of a earth stake, which is not connected to your electrical system, but your antenna.
There is a lot you can do to improve a SWL station. But for a start, just try to get a semi decent basic station in place & see what your local electrical noise levels are like. As it could be that you have S9 or even S 30, of noise.
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