Marconi AD108 Aircraft Receiver - UK Vintage Radio Repair and Restoration Discussion Forum

varsity · 28th Nov 2016, 3:33 pm

Hi
I am a new member trying to find information on the 28 volt input to the above receiver which we have in our museum.
Can anyone help please? Thank you.

space charge · 28th Nov 2016, 3:57 pm

go to bama website
search under Marconi
download ad108 10 MB.

AC/HL · 28th Nov 2016, 5:43 pm

http://bama.edebris.com/manuals/marconi/

varsity · 28th Nov 2016, 6:16 pm

Thanks for these replies, I have looked at the circuit diagram but unfortunately it does not show the connections for the 28 volt input so I am still a bit stuck for the correct pin connections to the Jones plugs.

ms660 · 28th Nov 2016, 6:42 pm

Is it possible to trace the dynamotors motor winding connection back to the 28 volt input?

Lawrence.

Synchrodyne · 28th Nov 2016, 7:49 pm

Take a look at this thread:

https://www.vintage-radio.net/forum/...ad.php?t=60052

The BOAC paper on the AD108 referenced therein does include power supply and connection details in the full schematic on the last page.

Cheers,

Herald1360 · 29th Nov 2016, 12:06 am

But the BOAC document there is the selfsame one as the BAMA one- childish scribbles, adult annotations and all.

The power circuit is on the last page, but no pin connection details.

Synchrodyne · 29th Nov 2016, 1:59 am

But there do appear to be points in the circuit that are annotated with pin numbers of the 'AD' and 'H' Jones plugs.

E.g. H3 at the top of the heater chain and H1 and H2 at the bottom.

Cheers,

varsity · 4th Dec 2016, 9:55 pm

Dear All
Thanks for your help with this receiver. It is now running but after a short while an electrolytic capacitor started to smoke so have decided to replace all the capacitors in the RX then hopefully it will play.
Cheers,
Varsity ( The type of aircraft I worked on in the RAF)

HamishBoxer · 5th Dec 2016, 10:56 am

Either that capacitor is failing or it has excess voltage across it. Check carefully rather than a blanket change and end up with all sorts of problems.

28th Nov 2016, 3:33 pm	#1
varsity Retired Dormant Member Join Date: Nov 2016 Location: Gosport, Hampshire, UK. Posts: 3	Marconi AD108 Aircraft Receiver Hi I am a new member trying to find information on the 28 volt input to the above receiver which we have in our museum. Can anyone help please? Thank you.

28th Nov 2016, 3:57 pm	#2
space charge Tetrode Join Date: May 2013 Location: Enniscorthy, County Wexford, Ireland. Posts: 74	Re: Marconi AD108 Aircraft Receiver go to bama website search under Marconi download ad108 10 MB.

28th Nov 2016, 5:43 pm	#3
AC/HL Dekatron Join Date: Nov 2003 Location: Heckmondwike, West Yorkshire, UK. Posts: 9,642	Re: Marconi AD108 Aircraft Receiver http://bama.edebris.com/manuals/marconi/

28th Nov 2016, 6:16 pm	#4
varsity Retired Dormant Member Join Date: Nov 2016 Location: Gosport, Hampshire, UK. Posts: 3	Re: Marconi AD108 Aircraft Receiver Thanks for these replies, I have looked at the circuit diagram but unfortunately it does not show the connections for the 28 volt input so I am still a bit stuck for the correct pin connections to the Jones plugs.

28th Nov 2016, 6:42 pm	#5
ms660 Dekatron Join Date: Apr 2011 Location: Cornwall, UK. Posts: 13,454	Re: Marconi AD108 Aircraft Receiver Is it possible to trace the dynamotors motor winding connection back to the 28 volt input? Lawrence.

28th Nov 2016, 7:49 pm	#6
Synchrodyne Nonode Join Date: Jan 2009 Location: Papamoa Beach, Bay of Plenty, New Zealand Posts: 2,944	Re: Marconi AD108 Aircraft Receiver Take a look at this thread: https://www.vintage-radio.net/forum/...ad.php?t=60052 The BOAC paper on the AD108 referenced therein does include power supply and connection details in the full schematic on the last page. Cheers,

29th Nov 2016, 12:06 am	#7
Herald1360 Dekatron Join Date: Feb 2007 Location: Leominster, Herefordshire, UK. Posts: 16,535	Re: Marconi AD108 Aircraft Receiver But the BOAC document there is the selfsame one as the BAMA one- childish scribbles, adult annotations and all. The power circuit is on the last page, but no pin connection details. __________________ ....__________ ....\|____\|\|__\|__\_____ .=.\| _---\__\|__\|_---_\|. .........O..Chris....O

29th Nov 2016, 1:59 am	#8
Synchrodyne Nonode Join Date: Jan 2009 Location: Papamoa Beach, Bay of Plenty, New Zealand Posts: 2,944	Re: Marconi AD108 Aircraft Receiver But there do appear to be points in the circuit that are annotated with pin numbers of the 'AD' and 'H' Jones plugs. E.g. H3 at the top of the heater chain and H1 and H2 at the bottom. Cheers,

4th Dec 2016, 9:55 pm	#9
varsity Retired Dormant Member Join Date: Nov 2016 Location: Gosport, Hampshire, UK. Posts: 3	Re: Marconi AD108 Aircraft Receiver Dear All Thanks for your help with this receiver. It is now running but after a short while an electrolytic capacitor started to smoke so have decided to replace all the capacitors in the RX then hopefully it will play. Cheers, Varsity ( The type of aircraft I worked on in the RAF)

5th Dec 2016, 10:56 am	#10
HamishBoxer Dekatron Join Date: Aug 2007 Location: W.Butterwick, near Doncaster UK. Posts: 8,935	Re: Marconi AD108 Aircraft Receiver Either that capacitor is failing or it has excess voltage across it. Check carefully rather than a blanket change and end up with all sorts of problems. __________________ G8JET BVWS Archivist and Member V.M.A.R.S