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Author Topic: Antenna cables- extension  (Read 5958 times)

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daveg4otu

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Antenna cables- extension
« on: April 26, 2009, 10:05:48 AM »
Using the supplied antenna here-with good results considering the location.

At the moment  the antenna is on a  biscuit tin - on the roof  just outside - at about the limit of the cable.

Soon(with luck ) I will have a  vacant spot on  the mast that carries my VHF/Air antenna(this will extend my coverage to the west considerably) ... but will need longer cable perhaps 5metres more - does anyone supply  extension antenna cables pre-fitted with the  correct connectors for ANRB...or if not -  does anyone supply the  connectors/plugs...if so exactly what are they called?

MTIA

Dave
5 Miles N of BHD at 50.28.28 N/3.30.43W...400ft amsl.

Hampshire, Devon, Dorset and Isle of Wight  Airfields Websites.....
http://devonairfields.tripod.com/index.htm

nortonbeak

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Re: Antenna cables- extension
« Reply #1 on: April 26, 2009, 10:58:53 AM »
I think that there is a general consensus that the supplied antenna would not be suitable for prolonged external use. Certainly not if you are UK based.

So you would probably need to select an after-market antenna (of which there are many) and some suitable cable.

If you are UK based then cable perhaps from

http://whwestlake.110mb.com/cable-wire.pdf

Dazzlercee

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Re: Antenna cables- extension
« Reply #2 on: April 26, 2009, 03:18:47 PM »
What is the problem with mounting the standard antenna outside?

Mine is on a disused flue on the roof with the Radarbox in the loft.
The manual clearly states that the supplied antenna is NOT an internal antenna and to mount outside for best results.

Have there been a number of failures when mounted externally?

Daz

Allocator

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Re: Antenna cables- extension
« Reply #3 on: April 26, 2009, 03:30:10 PM »
I used the standard antenna outside on the Velux roof window for months after I got my RB, it didn't seem to come to any harm.  I stand it outside on the window ledge in the rain every now and then, and it's fine.

One of the biggest killers of any antenna mounted outside is water getting into the co-ax as it just sucks it up like a sponge.  That and corrosion causing a lack of electrical contact between the antenna and the cable.
« Last Edit: April 26, 2009, 03:32:12 PM by Allocator »

WAL 2T

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Re: Antenna cables- extension
« Reply #4 on: April 26, 2009, 03:36:25 PM »
Had mine out above the gutter for about 18 months in all weathers and not had any problems with the antenna itself or the feeder. The ground plane disk does corrode though and start to shed it's paint if that is also placed outside.
Chris

Under the EGGP 27 Centreline & 15nm from EGCC

malc41

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Re: Antenna cables- extension
« Reply #5 on: April 27, 2009, 08:53:54 AM »
WHich is the best cable to buy though if you are thinking of extending the cable by say 5m?
15 Miles East of EGNJ

WAL 2T

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Re: Antenna cables- extension
« Reply #6 on: April 27, 2009, 03:43:28 PM »
WHich is the best cable to buy though if you are thinking of extending the cable by say 5m?

LMR400 or Westflex 103. You can now get hold of large entry crimp-on SMA connectors for the above in both male and female flavours which would allow you to make up a suitable extension for the supplied antenna (male one end and female at the other). Just have to be careful that the feeder is secured carefully so it's weight doesn't destabilise the antenna.

Link to connectors:

http://www.connextech.co.uk/lmr400-connectors-8-c.asp
Chris

Under the EGGP 27 Centreline & 15nm from EGCC

bailey_uk

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Re: Antenna cables- extension
« Reply #7 on: April 27, 2009, 03:53:09 PM »
Just out of interest, am I right in thinking that when using Westflex 103, that there isnt a connector to use directly to the RB? Hence a patch lead is needed?
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WAL 2T

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Re: Antenna cables- extension
« Reply #8 on: April 27, 2009, 04:22:32 PM »
Just out of interest, am I right in thinking that when using Westflex 103, that there isnt a connector to use directly to the RB? Hence a patch lead is needed?

As per above you can now buy large entry SMA connectors which will suit the larger diameter cables such as 103 and LMR400 so you could have a single run feeder with an external antenna (n-type to sma). If you're referring to the radar extender kit; a patch lead is included to connect the radar box to the BNC connection on the BIAS-T.
Chris

Under the EGGP 27 Centreline & 15nm from EGCC

bailey_uk

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Re: Antenna cables- extension
« Reply #9 on: April 27, 2009, 04:32:01 PM »
Ah if only id of known that yesterday!

I have just purchased from Westlakes, a 8m length of '103' with a patchlead for connection to my RB.

Is there substantial signal loss by using a patch lead instead of one of those new large entry SMA connectors?
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WAL 2T

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Re: Antenna cables- extension
« Reply #10 on: April 27, 2009, 06:15:36 PM »
If the patch lead is made with RG58 I would be inclined to ditch it (even a small run).
Chris

Under the EGGP 27 Centreline & 15nm from EGCC

bailey_uk

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Re: Antenna cables- extension
« Reply #11 on: April 27, 2009, 07:07:10 PM »
William Westlake is making it for me, and posted it today so will find out when it arrives!
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malc41

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Re: Antenna cables- extension
« Reply #12 on: April 28, 2009, 08:48:27 AM »
WAL2T

Thanks for the info
15 Miles East of EGNJ

bailey_uk

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Re: Antenna cables- extension
« Reply #13 on: April 28, 2009, 11:10:19 AM »
Yeh the patch lead is RG58.

I am still going to use it, as it will be a huge improvement from the supplied RB one. And then after a while, have a go at soldering one on myself. How do they differ from soldiering a pl259?
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nortonbeak

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Re: Antenna cables- extension
« Reply #14 on: April 28, 2009, 11:34:27 AM »
How do they differ from soldiering a pl259?

If you mean by "they" an SMA plug, then not a lot. The central pin is just smaller.

The SMA plugs from Maplin have a crimp fitting around the braid rather than the clamp fitting of the PL259.