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cold

Member Since: 15 Dec 2018
Location: Yorkshire
Posts: 118

DAB Reception lost when ignition is on

Earlier this year I installed a JVC M745DBT double din unit into my 09 Puma - worked ok but DAB reception. Kept dropping. Read on here that there was a fault with earlier models of this unit and fair play to Halfords they swopped it out for a more recently manufactured unit .

So new unit in, DAB when no ignition fantastic, with ignition/engine on ‘no signal’ but FM and Carplay all ok

So checked the threads on here and...

1) Nothing plugged into cig lighter
2) `Tried different aerial that I simply plugged in and attached to roof - same problem
3) Wired neg directly to battery - same problem
4) Change aerial splitter - same problem

Now at a loss, JVC Customer service saying unit has to be ok as works with engine off

Any ideas on what I can try next? - All help appreciated

So at a loss -

16th Sep 2019 3:51pm

dorsetsmith

Member Since: 30 Oct 2011
Location: South West
Posts: 4554

USB mobile phone charger ? most are switch mode power supply will cores lost radio reception then power up

Last edited by dorsetsmith on 16th Sep 2019 4:21pm. Edited 1 time in total

16th Sep 2019 4:03pm

BaronDefenders

Member Since: 28 Jun 2019
Location: London/Cotswolds
Posts: 896

2004 Defender 90 Td5 CSW Santorini Black

Is it possible you’re getting interference from something that only comes on with the ignition? Something along the lines of LED daytime running lights Charlie

1949 Series 1 80 (SOLD)
2002 Td5 90 (SOLD)
2008 Freelander 2 (SOLD)

1958 Series 2 88 Pastel Green (2019 LR Legends Best Restored)
1983 V8 110 Limestone (Previously owned by Tom Sheppard MBE)
2004 Td5 90 Santorini Black (Td5INSIDE Powered & Rebuilt by CSK)
2012 Puma 110 Zermatt Silver (Overlanding Build)

Instagram: @BaronDefenders

16th Sep 2019 4:08pm

bpman

Member Since: 21 May 2008
Location: Oslo
Posts: 8069

2008 Defender 110 Puma 2.4 SVX Station Wagon Santorini Black

dashcam?

16th Sep 2019 4:21pm

cold

Member Since: 15 Dec 2018
Location: Yorkshire
Posts: 118

many thanks for the replies - DRL’s may be an option, though they do come on in second ignition position (glow plug) and radio works but will do a full test at the weekend - unfortunately no dash cam or USB chargers though. If its not the unit then it must be electrical interference and lights are my best bet.

16th Sep 2019 6:20pm

cold

Member Since: 15 Dec 2018
Location: Yorkshire
Posts: 118

It was DRL’s, a couple of RF chokes on the DRL loom and we have a signal - thanks all!

22nd Sep 2019 7:14pm

Sulisuli

Member Since: 30 Oct 2016
Location: South west
Posts: 4795

2015 Defender 90 Puma 2.2 HT Corris Grey

Glad you got that sorted, hope your other repair is a quick one too. 2015 HT XS 90
2008 SVX 90
2000 XS TD5 90

22nd Sep 2019 7:30pm

cold

Member Since: 15 Dec 2018
Location: Yorkshire
Posts: 118

Thank you, the joy of Defender ownership, one minute you are stressing over something as small as static as you cant get great DAB reception driving to work....then problem solved you cant drive to work

23rd Sep 2019 8:18am

Sulisuli

Member Since: 30 Oct 2016
Location: South west
Posts: 4795

Brilliant summary and Im sure we have all felt exactly that

2015 HT XS 90
2008 SVX 90
2000 XS TD5 90

23rd Sep 2019 8:34am

90 Dreamer

Member Since: 13 Jul 2019
Location: Oop North
Posts: 2158

2016 Defender 90 Puma 2.2 HT Corris Grey

and "stripes"..........you can't forget stripes..........

23rd Sep 2019 2:33pm

carrotbay

Member Since: 18 Aug 2013
Location: Northants, UK
Posts: 699

2008 Defender 110 BMW M57 3.0 Diesel XS CSW Auto Santorini Black

I've had this issue ever since I've had DRLs. When you say RF Chokes what did you use and where?

Thanks 2008 Defender 110 XS SW - M57N2 / 6HP28X

23rd Sep 2019 3:02pm

cold

Member Since: 15 Dec 2018
Location: Yorkshire
Posts: 118

Ferrite Ring Cores - you clip them over the cable as close to the ‘source’ in this case DRL as you can - link to Amazon below - hope that helps

https://www.amazon.co.uk/QPOWER-Ferrite-Su...&psc=1

23rd Sep 2019 3:09pm

carrotbay

Member Since: 18 Aug 2013
Location: Northants, UK
Posts: 699

Great .. thanks 2008 Defender 110 XS SW - M57N2 / 6HP28X

23rd Sep 2019 3:19pm

custom90

Member Since: 21 Jan 2010
Location: South West, England.
Posts: 20382

Is there anywhere you SHOULDN'T use the Ferrite chokes? $W33T $0U7H3RN $UG4R
🇬🇧🏴󠁧󠁢󠁥󠁮󠁧󠁿🏴󠁧󠁢󠁷󠁬󠁳󠁿🏴󠁧󠁢󠁳󠁣󠁴󠁿🇮🇪🇺🇸⛽️🛢️⚙️🧰💪

23rd Sep 2019 5:06pm

peanutbob

Member Since: 12 Feb 2009
Location: UK
Posts: 291

Resurrecting this thread…I have just collected a 12 plate puma with a Pioneer dab radio. As soon as the headlights are used the signal disappears . The aerial is unfortunately a stick on glass affair, which is not helped as the front screen is heated. But with headlights off it works ok, bar the ott complexity of the Pio unit.
I’m assuming that the cure will be ferrite cores close to the unknown make led headlights?

Thanks

24th Nov 2022 7:05pm

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