Uhf vhf discone

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Uhf vhf discone

Postby Fire1160 » Wed Jan 03, 2018 3:59 pm

Quick question discone or uhf vhf arial on ubc 15x on military spec coax cheers
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Re: Uhf vhf discone

Postby m0lsx » Wed Jan 03, 2018 5:02 pm

Define Military Spec? The reality is that the term Military Spec is meaningless & is probably a breech of trading standards law. It is even used on coax such as RG-8 which the military have never used & the RG prefix was originally a Military specification & stood for Radio Guide. But is now long obsolete as a Military Spec.
The term RG is now not a specification in any sense. It is simply a commonly used prefix to help us know an approximation of what it is, or should be. But RG coax comes in a multitude of qualities.
Also what type of Coax? I would say good quality RG-213 as a minimum, but not if it's over say 25 meters long, when better quality coax becomes even more important, especially at UHF.
For me where the Coax is purchased from is far more important than the type it is. i.e a good RG-58 could potentially be as good as a poor RG-213.
Personally I started using Ecoflex some time ago. It is good quality coax & Ecoflex 15 is as flexible as RG-58, but with better performance than even the best RG-213.
100 meters of Ecoflex 15 looses around 6dB at 500 mhz.
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Re: Uhf vhf discone

Postby Fire1160 » Wed Jan 03, 2018 5:54 pm

Rg213u mil c 17(1) 701_96. Thats whats stamped on it i was hopeing to use this for my other scanners with a uhf vhf arial onto a 4way splitter to run the netset pro 2006 and the vhf conection on the frg 7700 im purchaseing the ubc15x and was wondering what to put up a discone or another vhf uhf with the spec above coax :thumbup:
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Re: Uhf vhf discone

Postby Fire1160 » Wed Jan 03, 2018 6:02 pm

Theres aprox 5ft to the splitter but probaly arond 13ft tied to the house to what arial for the ubc 15x :shocker:
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Re: Uhf vhf discone

Postby m0lsx » Wed Jan 03, 2018 6:24 pm

Personally I would say it's choice. There are pro's & cons for both antennas.
What I would say is that all the so called Discones I have seen on sale over recent years, are not in reality Discones.
My current antenna is a three band colinear, but only because I did use it for 2 & 70 use when I first put it up. But now it's only very occasionally used on 6 meters.
I do have TX capable a base discone which is not currently up & an indoor discone. Both of which perform well for what they are & I did have a really good Discone back in the late 80's/ early 90's that I wish I still had.
Many of the so called discones sold today are a few legs attached to a small mobile whip.
You do realise that a splitter is going to insert a big loss in your feed? Not only will the signal be cut into two, but the splitter it's self, plus the connectors will add in extra loss & it's no good putting a pre-amp in after the signal has been lost. You need one at the highest signal point.
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Re: Uhf vhf discone

Postby Fire1160 » Wed Jan 03, 2018 7:05 pm

Thankyou i realise it will be at a loss but im extreamly close to the major port of hull aprox 5 miles so with the two scanners im putting in simples and duplex then the ubc for aircraft cival and miletery and mrt thankyou for your corispondance its appreciated
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Re: Uhf vhf discone

Postby m0lsx » Wed Jan 03, 2018 9:00 pm

Do you have Marine Traffic :?: It can be set up to show you the shipping traffic in the Hull area.
A TV amplifier would allow you to have a decent remote amplifier & often these amplifiers also allow you to set the amplification to a sensible level for two feeds. As they have variable gain.


http://www.marinetraffic.com/en/ais/home/centerx:14.2/centery:52.1/zoom:6
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Re: Uhf vhf discone

Postby Fire1160 » Thu Jan 04, 2018 1:39 am

I use ship plotter and plane spotter on the laptop i also have a marine radio licence and rya power boat 1and2. As the crow flies to the humber is 2miles aprox with nothing in the way a direct line to vts humber there signal bangs through i want to decode dmr the ubc 15x has the discrimantor mod done thats why im wondering vhf or discone purely for that set
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Re: Uhf vhf discone

Postby Fire1160 » Thu Jan 04, 2018 1:45 am

Its not ship plotter its marine traffic lol sorry my mistake its the one you gave me in link :thumbup:
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Re: Uhf vhf discone

Postby G4RMT » Thu Jan 04, 2018 2:17 pm

I suggest you work out the importance of every band you want. If you need a wide range of bands, I think a discone is superior, but if you need marine, and perhaps just a bit of the rest - a dual band white stick type could work better. I've never been lucky with preamps and splitters at my location because I have some mega strong 153/4 MHz signals very close to me and these overload the preamp and it causes all kinds of grief - phantom frequencies, rubbish all over the place and desenses marine quite badly. I guess it depends on what you are wanting. There are now some very good passive splits with quite low loss, and generally for aircraft - as you can hear them off you can point at them, ultimate gain isn't an issue.

Cable though, as Alan says is! cheap stuff lasts less long and has very random loss. Decent stuff costs more and is better - but which is which is tricky as they have the same labels!
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