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Noise

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Anonymous
(@anonymous)
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Topic starter
 

I seam to have a spuious noise on my ferguson 51A3 .It is hiden more if the sound is turned up.May be its something to do with how the freeview box and the dvd recorder is connected to the tv which is through the rf cable from the recorder?

David

 
Posted : 04/01/2013 4:49 pm
Terrykc
(@terrykc)
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... May be its something to do with how the freeview box and the dvd recorder is connected to the tv which is through the rf cable from the recorder?

Why aren't you using SCART leads? They may well resolve your problem - as well as improving the quality.

When all else fails, read the instructions

 
Posted : 04/01/2013 5:48 pm
Jamie
(@jskinner97)
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Tx100 Chassis I believe? Is this the same set you have had many problems with on GVR?

 
Posted : 04/01/2013 8:47 pm
Anonymous
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Er there is a scart from the freeview box to the vhs/dvd recorder then rf cable out to the tv as theres no scart on the model as some will know.Yes its the same tv as on that wurhurr site !!.
The noise is like a whoseing sound /background hiss type.It is more noticable at low volume but then is hardly noticable when you turn the volume up.
I could try setting the configaration of the cables a differant way round and to get better quality cables.

David

 
Posted : 06/01/2013 1:59 am
Jamie
(@jskinner97)
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Sounds more like the tv isn't tuned very well? Does it have AGC? Auto Gain Control? As I highly doubt cables would give too much noise..

 
Posted : 06/01/2013 9:57 am
Terrykc
(@terrykc)
Posts: 4005
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... there is a scart from the freeview box to the vhs/dvd recorder then rf cable out to the tv as theres no scart on the model as some will know.

David, do you want this set to be able to receive (locally generated) UHF analogue transmissions in the way it was originally designed to do or are you more interested in it being able to display modern digital transmissions by any means, albeit with some modification?

I ask this because, although my original SCART suggestion is currently invalid, as you have said (and I had realised when the chassis type became known) it is possible to add SCART facilities.

In the first place, the chassis is mains isolated and the decoder chip has facilities for external RGB (and was used to inject Teletext on some sets using it).

Moreover,in some discussion of this on the 'other' forum it has been pointed out that Thorn produced a small PCB for SCART conversions on sets using this chassis. It shouldn't be too difficult, therefore, using the Philips application notes for the chip, to devise a simple SCART interface modification which will, of course, also (obs)cure the sound problems you are having.

Is this worthy of consideration?

You could, of course, repair the set to put it back into full working order and carry out the SCART modification with off-air/SCART switching to give you the best of both worlds ...

When all else fails, read the instructions

 
Posted : 06/01/2013 12:40 pm
Anonymous
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ATM its not realy and issue that need s to be fixed straight away.I have the service sheets for this model ready and would pass them onto whom ever i get to do jobs on it.
I am awear of the TX100 being able to have a scart socket fitted as already gleaned from other forum members on ****** fourm who have this set and have added the socket but prefer to leave this one as origanal.I do however have another 51A2 that i bought for that purpose until the couria droped it wurhurr so until i can get a replacement Mullard crt iam stuck.

David

 
Posted : 06/01/2013 3:22 pm
Anonymous
(@anonymous)
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Topic starter
 

... there is a scart from the freeview box to the vhs/dvd recorder then rf cable out to the tv as theres no scart on the model as some will know.

David, do you want this set to be able to receive (locally generated) UHF analogue transmissions in the way it was originally designed to do or are you more interested in it being able to display modern digital transmissions by any means, albeit with some modification?

I ask this because, although my original SCART suggestion is currently invalid, as you have said (and I had realised when the chassis type became known) it is possible to add SCART facilities.

In the first place, the chassis is mains isolated and the decoder chip has facilities for external RGB (and was used to inject Teletext on some sets using it).

Moreover,in some discussion of this on the 'other' forum it has been pointed out that Thorn produced a small PCB for SCART conversions on sets using this chassis. It shouldn't be too difficult, therefore, using the Philips application notes for the chip, to devise a simple SCART interface modification which will, of course, also (obs)cure the sound problems you are having.

Is this worthy of consideration?

You could, of course, repair the set to put it back into full working order and carry out the SCART modification with off-air/SCART switching to give you the best of both worlds ...

If a Ferguson scrat modpfication was able to be obtained i would go down the line.
Does anyone know what the part no was?

David

 
Posted : 20/07/2013 1:31 pm
Refugee
(@refugee)
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Those interfaces used to be delivered in useful little boxes.
I do not have a copy of the instructions however the part number survives on one of the boxes after all these years.

 
Posted : 20/07/2013 2:16 pm
Anonymous
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Those interfaces used to be delivered in useful little boxes.
I do not have a copy of the instructions however the part number survives on one of the boxes after all these years.

TA124?
David

 
Posted : 20/07/2013 4:05 pm
Refugee
(@refugee)
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They went with the early TX10 with a mono audio chip and some later models with only one side of the stereo audio chip connected. You may need to add a copy of the audio part to make it fit a later chassis with full stereo sound. They had BNC for video in and TV out and DIN for audio.

 
Posted : 20/07/2013 4:13 pm
Anonymous
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They went with the early TX10 with a mono audio chip and some later models with only one side of the stereo audio chip connected. You may need to add a copy of the audio part to make it fit later chassis with full stereo sound. They had BNC for video in and TV out and DIN for audio.

:aaj My Fergies dont have stereo there toooooooooo old :aak

David

 
Posted : 20/07/2013 5:27 pm
Refugee
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I always became aware that I was going to have half a day fitting them when I spotted the pallet of sets with a pile of little boxes on top :cch

 
Posted : 20/07/2013 6:16 pm
Anonymous
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I always became aware that I was going to have half a day fitting them when I spotted the pallet of sets with a pile of little boxes on top :cch

:thumb As your up the road from me i know where to come if and when i find the part to be fitted then :aaj

David

 
Posted : 20/07/2013 9:59 pm
Refugee
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If it is a 26 inch you will be carrying it up stairs to my workshop :aaj

 
Posted : 21/07/2013 1:10 am
Refugee
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I have had a quick look at my manuals and it is good news.
I have found an early version that predates the TA124 where they cut a big section out of the back of the set, however even better the manual for the TA124 itself.
They are readable on the forum now the file size is 100K.
Chris if you want a copy for the library I can send them at 1Meg for you.
I have forgotten the email address though.

 
Posted : 21/07/2013 3:12 am
crustytv
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Pm'd e-mail

I will place a copy in the library as requested.

CrustyTV Television Shop: Take a virtual tour
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Crusty's 70s Lounge: Take a peek

 
Posted : 21/07/2013 9:49 am
Anonymous
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If it is a 26 inch you will be carrying it up stairs to my workshop :aaj

its a 51cm :) I may have that diagram aswell somewhere
David

 
Posted : 21/07/2013 12:02 pm
Refugee
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There are one or two of what the manufacturers call "characteristics" that are worth noting down.
In the diagram the where wires cross an earth plane they are clearly shown not connected. The moment you look at the switching wires they are shown shorted by the audio cable and even have connection dots. This is not a problem if you are just fitting the kit but would be a potential problem if a home brew build is being done.
The other thing to remember is that it is not quite possible to get an off air signal out without a little bit of tinkering.
The switch that is ganged with the audio socket has to shut the IF down in order to stop the off air signal clashing with the video input. If you are recording live TV with a U-matic or reel to reel recorder you need to disconnect the video in plug from the set and use an audio plug that has been modified so that it does not operate the switch. You can then record. There is no E_E signal from an off air source.

The more complicated circuit that Chris has moved to the main site for safe keeping does not have any problem with the E_E switching as the switch is manually operated.
It is a lot more work should you choose to make a home brew of it and with the lack of live off air signals perhaps not worth the trouble. I have offered it as reference material for anyone whom is converting some other set to be a monitor.

 
Posted : 21/07/2013 12:49 pm
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