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The Norfolk Broads Forum / Broads Boat Owners Q & A / Radio Reception
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Posted By Discussion Topic: Radio Reception

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woodwose
Jul-31-2017 @ 11:06 PM                           Permalink
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Mardles sometimes
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Jim

If you are making a dipole aerial then this consists of two wires each of which is a quarter wavelength long (76 cms).

If you are feeding it with co-axial cable, connect the inner conductor to one of the wires and the outer conductor (braid) to the other wire. Do not join the inner and outer conductors together. Make sure you have a proper belling lee plug on the other end of the co-ax and solder the inner conductor to the plug.

The top of the T should be straight as in the drawing on the website. However, it does not have to be horizontal as the signal from Tacolneston is mixed polarization. I would mount it vertically if possible as this will make it an omni-directional aerial. Horizontal dipoles receive signals from the side stronger than signals from the ends.

I still think a random length if wire connected to the inner conductor of the radio aerial socket is easier and simpler to do.

Hope this helps.

Nigel

Simondo
Aug-01-2017 @ 2:18 PM                           Permalink
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I'm not sure you want to shell out any money but if you have a DAB radio or could borrow one and just see of thats any better. If you do get a signaql on the channels you want the sound quality will be much better. They work fine on the Yare

Marthamdavid
Oct-06-2017 @ 5:05 PM                           Permalink
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Hi, each leg of the dipole should be approximately 0.75m long, ie 1.5m overall.

jimfin
Oct-06-2017 @ 5:32 PM                           Permalink
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Thanks for all the replies.
Lots of info, but a simple picture would speak a 1000 words!!

If you don't use your boat. Sell it.

Koolwabbit
Oct-06-2017 @ 6:14 PM                           Permalink
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Funny you should ask this as just yesterday I fixed my radio that had same fault. Bought a second hand radio for boat but all it would receive was static so I went and bought one of those under dash aerials, no change, then bought a rubber ducky. Still the same so thought radio, took apart to check aerial connection. All good. Then realised using USB charger faded signal so rewired live straight to battery.PERFECT ,!! Turned out was interference  from new control panel. Try a suppressor inline
Nigel

Regulo
Oct-07-2017 @ 9:35 AM                           Permalink
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I used to find using a phone charger introduced all sorts of weird whistling and fading on my old radio. I've upgraded to DAB, and also installed fixed USB outlets, and now have perfect reception, even when phone charging.

Regards, Ray.

Whatever happens now, I'm blaming it on Brexit. Everyone else is!

Gordon
Oct-10-2017 @ 6:02 PM                           Permalink
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Keep it simple.  Before you start making dipoles etc   Try a couple off feet of ordinary cable into
The centre conductor of the aerial socket. Quick dirty and cheap try and will probably work

Gordon

"There is nothing - absolutely nothing- half so much worth doing as simply messing about in boats" Ratty in Wind in the Willows

woodwose
Oct-12-2017 @ 1:15 PM                           Permalink
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Mardles sometimes
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I agree with Gordon. A random length of wire connected to the inner conductor of the aerial socket would be my first choice. A rubber duck would be my last choice.

Jim - I posted a link to a diagram on 18th July. Just scroll up a few posts.

Small mains chargers for phones etc are a well known source of radio interference. Unplug them all if you have a problem with high levels of noise. Remember that mains sockets with USB charging plugs built in can also be a source of noise (as well as wasting power).

Nigel

Garry1973
Oct-12-2017 @ 10:11 PM                           Permalink
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I agree with Nigel and Gordon above.

Another bit to add regarding 12v phone chargers. The high freq switching in these is often in the RF range and ends up on the 12v supply cables because of lack of capacitors and inductors to filter it out. The cables then act as a transmitter for radios to pick up even portable battery dab etc.

My advice is go dead ship (ie all electrics off) and see if the radio works.

Part time Boater

jimfin
Oct-25-2017 @ 1:07 PM                           Permalink
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Thanks for all the replies guys. Coming to the end of the season now so will not be able to sort this problem out till I'm on the water again next year.
Looking at all the advice given, I think (dangerous!!) the main problems are the USB phone charger and the radio not does not seam to be set up for RDS.
I think that's what it is. Where the radio searches for the strongest signal.

If you don't use your boat. Sell it.

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