I fairly recently got an LCD TV for the workshop which has a VGA input.
It's situated conveniently for the electronics workbench. The idea being I
could use it for testing any video signal.

It occurred it would be nice to have it parallel fed off the RPC which is
on the other side of the room to save having to print out circuits etc I
might be following.

So I bought a 5 mtr VGA lead from Ebay. And a secondhand Rextron VSA18
splitter which has 8 outputs.

I made up the input lead for that as it requires a male to female type.
I Googled for SVGA pinouts and got different stories - so simply made it
pin for pin compatible with the existing monitor lead using co-ax for the
video signals. The pins with no connection are 4,5,8,12.

If I piggy back it to the RPC monitor lead that works as normal. The same
with the long cable to the TV.

But plug in the splitter - nothing. The 'active' light on the DA does come
on, though, presumably indicating it's getting an input.

I've no paperwork with the Rextron but their site says it works with VGA,
SVGA etc etc.

The obvious conclusion is the DA is faulty - but given the variety of SVGA
connections could I be missing something?

--
*Never underestimate the power of very stupid people in large groups *

Dave Plowman London SW
To e-mail, change noise into sound.

On Nov 8, 9:53*am, "Dave Plowman (News)" wrote:
*I fairly recently got an LCD TV for the workshop which has a VGA input..
It's situated conveniently for the electronics workbench. The idea being I
could use it for testing any video signal.

*It occurred it would be nice to have it parallel fed off the RPC which is
on the other side of the room to save having to print out circuits etc I
might be following.

*So I bought a 5 mtr VGA lead from Ebay. And a secondhand Rextron VSA18
splitter which has 8 outputs.

*I made up the input lead for that as it requires a male to female type..
I Googled for SVGA pinouts and got different stories - so simply made it
pin for pin compatible with the existing monitor lead using co-ax for the
video signals. The pins with no connection are 4,5,8,12.

If I piggy back it to the RPC monitor lead that works as normal. The same
with the long cable to the TV.

But plug in the splitter - nothing. The 'active' light on the DA does come
on, though, presumably indicating it's getting an input.

I've no paperwork with the Rextron but their site says it works with VGA,
SVGA etc etc.

The obvious conclusion is the DA is faulty - but given the variety of SVGA
connections could I be missing something?

If it doesnt work at all with vga, how can it be anything but faulty
or not compatible?


NT

In article ,
"Dave Plowman (News)" writes:
I fairly recently got an LCD TV for the workshop which has a VGA input.
It's situated conveniently for the electronics workbench. The idea being I
could use it for testing any video signal.

It occurred it would be nice to have it parallel fed off the RPC which is
on the other side of the room to save having to print out circuits etc I
might be following.

So I bought a 5 mtr VGA lead from Ebay. And a secondhand Rextron VSA18
splitter which has 8 outputs.

I made up the input lead for that as it requires a male to female type.
I Googled for SVGA pinouts and got different stories - so simply made it
pin for pin compatible with the existing monitor lead using co-ax for the
video signals. The pins with no connection are 4,5,8,12.

If I piggy back it to the RPC monitor lead that works as normal. The same
with the long cable to the TV.

But plug in the splitter - nothing. The 'active' light on the DA does come
on, though, presumably indicating it's getting an input.

I've no paperwork with the Rextron but their site says it works with VGA,
SVGA etc etc.

The obvious conclusion is the DA is faulty - but given the variety of SVGA
connections could I be missing something?

What will it be doing with the serial connection for the
EDID data (to read back screen size, refresh rates, etc)?
If this isn't connected, some systems will assume there's
no monitor connected, and it might not be passed through the
splitter (and if it does, which socket is it connected to?)

It might not feed through your VGA lead either -- that could
be why it's on eBay ;-)

(I've no idea if acorn systems use the monitor's EDID data.)

CPC do loads of video cables of different lengths with
different gender connectors.

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]

"Dave Plowman (News)" wrote in message
...
I fairly recently got an LCD TV for the workshop which has a VGA input.
It's situated conveniently for the electronics workbench. The idea being I
could use it for testing any video signal.

It occurred it would be nice to have it parallel fed off the RPC which is
on the other side of the room to save having to print out circuits etc I
might be following.

So I bought a 5 mtr VGA lead from Ebay. And a secondhand Rextron VSA18
splitter which has 8 outputs.

I made up the input lead for that as it requires a male to female type.
I Googled for SVGA pinouts and got different stories - so simply made it
pin for pin compatible with the existing monitor lead using co-ax for the
video signals. The pins with no connection are 4,5,8,12.

If I piggy back it to the RPC monitor lead that works as normal. The same
with the long cable to the TV.

But plug in the splitter - nothing. The 'active' light on the DA does come
on, though, presumably indicating it's getting an input.

I've no paperwork with the Rextron but their site says it works with VGA,
SVGA etc etc.

The obvious conclusion is the DA is faulty - but given the variety of SVGA
connections could I be missing something?

Dave Plowman


Have you tried using the SVGA pinout scheme to the splitter
http://www.dataip.co.uk/Reference/SVGAPinOut.php

These units are better supplied with SVGA signalling, than a VGA signalling
method. The splitter will do the rest of the conversion for you. You'll
notice that the pins connections are different from what you have now, but
if you've ever tried connecting a VGA to SVGA you'll know what happens. Try
the other way round and you get a signal.

I think it's worth a try.

"BigWallop" wrote in message
om...

"Dave Plowman (News)" wrote in message
...
I fairly recently got an LCD TV for the workshop which has a VGA input.
It's situated conveniently for the electronics workbench. The idea being
I
could use it for testing any video signal.

It occurred it would be nice to have it parallel fed off the RPC which
is
on the other side of the room to save having to print out circuits etc I
might be following.

So I bought a 5 mtr VGA lead from Ebay. And a secondhand Rextron VSA18
splitter which has 8 outputs.

I made up the input lead for that as it requires a male to female type.
I Googled for SVGA pinouts and got different stories - so simply made it
pin for pin compatible with the existing monitor lead using co-ax for
the
video signals. The pins with no connection are 4,5,8,12.

If I piggy back it to the RPC monitor lead that works as normal. The
same
with the long cable to the TV.

But plug in the splitter - nothing. The 'active' light on the DA does
come
on, though, presumably indicating it's getting an input.

I've no paperwork with the Rextron but their site says it works with
VGA,
SVGA etc etc.

The obvious conclusion is the DA is faulty - but given the variety of
SVGA
connections could I be missing something?

Dave Plowman


Have you tried using the SVGA pinout scheme to the splitter
http://www.dataip.co.uk/Reference/SVGAPinOut.php

These units are better supplied with SVGA signalling, than a VGA
signalling
method. The splitter will do the rest of the conversion for you. You'll
notice that the pins connections are different from what you have now, but
if you've ever tried connecting a VGA to SVGA you'll know what happens.
Try
the other way round and you get a signal.

I think it's worth a try.


Should also have said that a cheap SCART lead will give you the best ready
made cable for the fly lead to the splitter.

In article ,
Andrew Gabriel wrote:
The obvious conclusion is the DA is faulty - but given the variety of
SVGA connections could I be missing something?

What will it be doing with the serial connection for the
EDID data (to read back screen size, refresh rates, etc)?
If this isn't connected, some systems will assume there's
no monitor connected, and it might not be passed through the
splitter (and if it does, which socket is it connected to?)

It might not feed through your VGA lead either -- that could
be why it's on eBay ;-)

Well the maker's site seems to reckon it's compatible with all the various
standards.

(I've no idea if acorn systems use the monitor's EDID data.)

Don't think so.

CPC do loads of video cables of different lengths with
different gender connectors.

Indeed - but I was curious to know what it should be. Each site I look at
gives different connections for SVGA.

But it's sorted. The DA came without its wallwart PS - which could be why
I got it cheap. Normal 2.1mm? socket marked 9 v AC. And not having an AC
one I used DC. Which is usually ok. But not when the internal PS gives +/-
5 volts...

--
*Despite the cost of living, have you noticed how it remains so popular?*

Dave Plowman London SW
To e-mail, change noise into sound.

In article ,
BigWallop wrote:
Should also have said that a cheap SCART lead will give you the best
ready made cable for the fly lead to the splitter.

That would need two 15 pin D plugs fitted. Altering a VGA lead only
one. ;-)

I did look in the local Maplin. 17 quid for a VGA male to female. Asked
the assistant if they had a cheaper range and he said to go to Currys.

--
*Always remember you're unique, just like everyone else.

Dave Plowman London SW
To e-mail, change noise into sound.

"Dave Plowman (News)" wrote in message
...
In article ,
BigWallop wrote:
Should also have said that a cheap SCART lead will give you the best
ready made cable for the fly lead to the splitter.

That would need two 15 pin D plugs fitted. Altering a VGA lead only
one. ;-)

I did look in the local Maplin. 17 quid for a VGA male to female. Asked
the assistant if they had a cheaper range and he said to go to Currys.

Dave Plowman


But Dave, you want the thing to work, don't you? Two 15 pin plugs are cheap
enough for a project like yours. And, with the quality of your assembly
techniques, it will last for years and years.

http://www.hdinterconnects.com/index...5e2a602b35ed1b
26.99 quids for twenty metres with male to female connectors. Ready made.

In message , BigWallop
writes

"Dave Plowman (News)" wrote in message
...
In article ,
BigWallop wrote:
Should also have said that a cheap SCART lead will give you the best
ready made cable for the fly lead to the splitter.

That would need two 15 pin D plugs fitted. Altering a VGA lead only
one. ;-)

I did look in the local Maplin. 17 quid for a VGA male to female. Asked
the assistant if they had a cheaper range and he said to go to Currys.

Dave Plowman


But Dave, you want the thing to work, don't you? Two 15 pin plugs are cheap
enough for a project like yours. And, with the quality of your assembly
techniques, it will last for years and years.

http://www.hdinterconnects.com/index..._info&products
_id=57:fb77dd642f838ed7ac5e2a602b35ed1b
26.99 quids for twenty metres with male to female connectors. Ready made.

There's a company here in Watford who will make up quality leads to
spec.. I have a 15m VGA lead which gives an excellent picture cost me
£15 + VAT

Or contact RL Supplies


--
geoff

In article ,
geoff wrote:
http://www.hdinterconnects.com/index..._info&products
_id=57:fb77dd642f838ed7ac5e2a602b35ed1b 26.99 quids for twenty metres
with male to female connectors. Ready made.

There's a company here in Watford who will make up quality leads to
spec.. I have a 15m VGA lead which gives an excellent picture cost me
£15 + VAT

The 5 mtr one I got from Ebay cost 5.90 inc postage as a BIN. And it works
just fine. Of course the TV I'm feeding it with hasn't got the resolution
of a decent monitor. I'd guess. But It looks fine for my purpose.

--
*Those who live by the sword get shot by those who don't*

Dave Plowman London SW
To e-mail, change noise into sound.

"Dave Plowman (News)" wrote in message
...
In article ,
geoff wrote:

http://www.hdinterconnects.com/index..._info&products
_id=57:fb77dd642f838ed7ac5e2a602b35ed1b 26.99 quids for twenty metres
with male to female connectors. Ready made.

There's a company here in Watford who will make up quality leads to
spec.. I have a 15m VGA lead which gives an excellent picture cost me
£15 + VAT

The 5 mtr one I got from Ebay cost 5.90 inc postage as a BIN. And it works
just fine. Of course the TV I'm feeding it with hasn't got the resolution
of a decent monitor. I'd guess. But It looks fine for my purpose.

Dave Plowman


I was wondering how many leads I'd get from the one X twenty metre lead and
a few plugs. How much do 2 metre leads sell for?

In article ,
BigWallop wrote:
There's a company here in Watford who will make up quality leads to
spec.. I have a 15m VGA lead which gives an excellent picture cost
me £15 + VAT

The 5 mtr one I got from Ebay cost 5.90 inc postage as a BIN. And it
works just fine. Of course the TV I'm feeding it with hasn't got the
resolution of a decent monitor. I'd guess. But It looks fine for my
purpose.

I was wondering how many leads I'd get from the one X twenty metre lead
and a few plugs. How much do 2 metre leads sell for?

Couple of quid on Ebay - you'd have to by a lot of cable and plugs to get
the material costs down to that sort of level. And I'd say it takes about
1/2 hour to fit one plug properly.

--
*The sooner you fall behind, the more time you'll have to catch up *

Dave Plowman London SW
To e-mail, change noise into sound.

"Dave Plowman (News)" wrote in message
...
In article ,
BigWallop wrote:
There's a company here in Watford who will make up quality leads to
spec.. I have a 15m VGA lead which gives an excellent picture cost
me £15 + VAT

The 5 mtr one I got from Ebay cost 5.90 inc postage as a BIN. And it
works just fine. Of course the TV I'm feeding it with hasn't got the
resolution of a decent monitor. I'd guess. But It looks fine for my
purpose.

I was wondering how many leads I'd get from the one X twenty metre lead
and a few plugs. How much do 2 metre leads sell for?

Couple of quid on Ebay - you'd have to by a lot of cable and plugs to get
the material costs down to that sort of level. And I'd say it takes about
1/2 hour to fit one plug properly.

Dave Plowman


That's that idea out the window then. :-) Oh bugger.

On 8 Nov 2008 "BigWallop" wrote:

BigCobblers more like.

Have you tried using the SVGA pinout scheme to the splitter
http://www.dataip.co.uk/Reference/SVGAPinOut.php

These units are better supplied with SVGA signalling, than a VGA signalling
method. The splitter will do the rest of the conversion for you. You'll
notice that the pins connections are different from what you have now, but
if you've ever tried connecting a VGA to SVGA you'll know what happens. Try
the other way round and you get a signal.

Pull the SVGA one, it has bells on it.

There is no such thing as a SVGA cable, signal levels or pin outs, VGA
is the electrical standard. SVGA is denotation of resolution and
colour depth.

---druck

--
The ARM Club Free Software - http://www.armclub.org.uk/free/
The 32bit Conversions Page - http://www.quantumsoft.co.uk/druck/

"druck" wrote in message
...
On 8 Nov 2008 "BigWallop" wrote:

BigCobblers more like.

Have you tried using the SVGA pinout scheme to the splitter
http://www.dataip.co.uk/Reference/SVGAPinOut.php

These units are better supplied with SVGA signalling, than a VGA
signalling
method. The splitter will do the rest of the conversion for you.
You'll
notice that the pins connections are different from what you have now,
but
if you've ever tried connecting a VGA to SVGA you'll know what happens.
Try
the other way round and you get a signal.

Pull the SVGA one, it has bells on it.

There is no such thing as a SVGA cable, signal levels or pin outs, VGA
is the electrical standard. SVGA is denotation of resolution and
colour depth.

---druck


WOW !!! I thought there was a difference. According to this link
http://pinouts.ru/Video/VGA15_pinout.shtml the VGA connections are not
similar to the connections in the linked page above.

Or is this just because it's a different manufacturer? I didn't think they
could that with these types of leads.

On Sun, 09 Nov 2008 01:48:14 GMT
"BigWallop" wrote:

WOW !!! I thought there was a difference. According to this link
http://pinouts.ru/Video/VGA15_pinout.shtml the VGA connections are
not similar to the connections in the linked page above.

Or is this just because it's a different manufacturer? I didn't
think they could that with these types of leads.

They look the same to me, except the first one doesn't include the
extra data pins for examining the monitor.

As druck says, VGA is the electrical connection. The only difference
between VGA ans SVGA is signal timing.

B.

"Rob Kendrick" wrote in message
larn.net...
On Sun, 09 Nov 2008 01:48:14 GMT
"BigWallop" wrote:

WOW !!! I thought there was a difference. According to this link
http://pinouts.ru/Video/VGA15_pinout.shtml the VGA connections are
not similar to the connections in the linked page above.

Or is this just because it's a different manufacturer? I didn't
think they could that with these types of leads.

They look the same to me, except the first one doesn't include the
extra data pins for examining the monitor.

As druck says, VGA is the electrical connection. The only difference
between VGA ans SVGA is signal timing.

B.


What a load of pedantic buggers there are in here. :-)

OK then. Dave, your splitter may need the extra ID connection to obtain the
correct resolution for your monitor. A simple lower resolution VGA
connection scheme may not be enough to allow the splitter to convert to your
monitor timing signal.

Does that satisfy everyone?

me chuckles quietly in the corner, waiting for the barrage of abuse :-)

In article ,
BigWallop wrote:
They look the same to me, except the first one doesn't include the
extra data pins for examining the monitor.

As druck says, VGA is the electrical connection. The only difference
between VGA ans SVGA is signal timing.

B.


What a load of pedantic buggers there are in here. :-)

Well, that's the Acorn groups for you. But the true story is always
forthcoming from someone on them. ;-)

OK then. Dave, your splitter may need the extra ID connection to obtain
the correct resolution for your monitor. A simple lower resolution VGA
connection scheme may not be enough to allow the splitter to convert to
your monitor timing signal.

Does that satisfy everyone?

me chuckles quietly in the corner, waiting for the barrage of abuse :-)

I'm just curious why when you Google SVGA you get so many different
'definitive' pinouts.

But as it happens the problem was finger trouble on my part as so often.

--
*You sound reasonable......time to up my medication

Dave Plowman London SW
To e-mail, change noise into sound.

On Sun, 09 Nov 2008 02:25:18 GMT
"BigWallop" wrote:

They look the same to me, except the first one doesn't include the
extra data pins for examining the monitor.

As druck says, VGA is the electrical connection. The only
difference between VGA ans SVGA is signal timing.

What a load of pedantic buggers there are in here. :-)

Hardly pedantic. Those data pins are an extension, and you can still
use SVGA monitors without them, it's just you'll have to tell your
computer what modes it can do, rather than have it automatically detect
it.

I certainly wouldn't want to use a passive cable at all to split
higher-resolution modes (say, 1600x1200@85Hz) - for that I'd recommend
an active box.

B.

In article .net,
Rob Kendrick wrote:
I certainly wouldn't want to use a passive cable at all to split
higher-resolution modes (say, 1600x1200@85Hz) - for that I'd recommend
an active box.

Passive splitters never work *properly* with any baseband video signal as
they expect correct termination.
I'm using the correct active DA.

--
*Can atheists get insurance for acts of God? *

Dave Plowman London SW
To e-mail, change noise into sound.

In article , geoff
writes

There's a company here in Watford who will make up quality leads to
spec.. I have a 15m VGA lead which gives an excellent picture cost me

I had a 50m VGA lead (don't ask) made up by Leads Direct, and much to my
surprise it works. There's some ghosting, but the pic is usable.

In article ,
Mike Tomlinson wrote:
There's a company here in Watford who will make up quality leads to
spec.. I have a 15m VGA lead which gives an excellent picture cost me

I had a 50m VGA lead (don't ask) made up by Leads Direct, and much to my
surprise it works. There's some ghosting, but the pic is usable.

If you look at the size of the video co-ax inside the cable, I'm not
surprised. Making up a loom using proper co-ax would probably have worked
fine.

--
*How about "never"? Is "never" good for you?

Dave Plowman London SW
To e-mail, change noise into sound.

In article , Mike Tomlinson
wrote:
In article , geoff
writes

There's a company here in Watford who will make up quality leads to
spec.. I have a 15m VGA lead which gives an excellent picture cost me

I had a 50m VGA lead (don't ask) made up by Leads Direct, and much to my
surprise it works. There's some ghosting, but the pic is usable.

What resolution are you running?

As a general rule I think the higher the res the shorter the cable before
problems.


Chris Evans

--
CJE Micro's / 4D 'RISC OS Specialists'
Telephone: 01903 523222 Fax: 01903 523679
http://www.cjemicros.co.uk/
78 Brighton Road, Worthing, West Sussex, BN11 2EN
The most beautiful thing anyone can wear, is a smile!

In article , Dave Plowman (News)
wrote:
In article .net,
Rob Kendrick wrote:
I certainly wouldn't want to use a passive cable at all to split
higher-resolution modes (say, 1600x1200@85Hz) - for that I'd recommend
an active box.

Passive splitters never work *properly* with any baseband video signal as
they expect correct termination.
I'm using the correct active DA.

When you mentioned DA in the original posting I thought it might mean
Display Adaptor but now I'm very confused!


Chris Evans

--
CJE Micro's / 4D 'RISC OS Specialists'
Telephone: 01903 523222 Fax: 01903 523679
http://www.cjemicros.co.uk/
78 Brighton Road, Worthing, West Sussex, BN11 2EN
The most beautiful thing anyone can wear, is a smile!

In article , Chris Evans
writes
In article , Mike Tomlinson
wrote:

I had a 50m VGA lead (don't ask) made up by Leads Direct, and much to my
surprise it works. There's some ghosting, but the pic is usable.

What resolution are you running?

heh. DOS mode 80 x 25

As a general rule I think the higher the res the shorter the cable before
problems.

Agreed. More bandwidth used = worse picture

In article ,
Chris Evans wrote:
In article , Dave Plowman (News)
wrote:
In article .net,
Rob Kendrick wrote:
I certainly wouldn't want to use a passive cable at all to split
higher-resolution modes (say, 1600x1200@85Hz) - for that I'd
recommend an active box.

Passive splitters never work *properly* with any baseband video signal
as they expect correct termination.
I'm using the correct active DA.

When you mentioned DA in the original posting I thought it might mean
Display Adaptor but now I'm very confused!

Sorry - distribution amplifier. More accurate description than splitter
which could just as easily be passive.

--
*If God had wanted me to touch my toes, he would have put them on my knees

Dave Plowman London SW
To e-mail, change noise into sound.

We were somewhere around Barstow, on the edge of the desert, when the
drugs began to take hold. I remember Chris Evans
saying something like:

Passive splitters never work *properly* with any baseband video signal as
they expect correct termination.
I'm using the correct active DA.

When you mentioned DA in the original posting I thought it might mean
Display Adaptor but now I'm very confused!

I thought Duck's Arse haircut, but that's not a Very Good Acronym.

"Grimly Curmudgeon" wrote in message
...
We were somewhere around Barstow, on the edge of the desert, when the
drugs began to take hold. I remember Chris Evans
saying something like:

Passive splitters never work *properly* with any baseband video signal
as
they expect correct termination.
I'm using the correct active DA.

When you mentioned DA in the original posting I thought it might mean
Display Adaptor but now I'm very confused!

I thought Duck's Arse haircut, but that's not a Very Good Acronym.

Clever. Very Clever. :-)

In message , BigWallop
writes

"Grimly Curmudgeon" wrote in message
...
We were somewhere around Barstow, on the edge of the desert, when the
drugs began to take hold. I remember Chris Evans
saying something like:

Passive splitters never work *properly* with any baseband video signal
as
they expect correct termination.
I'm using the correct active DA.

When you mentioned DA in the original posting I thought it might mean
Display Adaptor but now I'm very confused!

I thought Duck's Arse haircut, but that's not a Very Good Acronym.

Clever. Very Clever. :-)


Quite easy really, you just need a tin of Brylcreem and ...

coat anywhere ?


--
geoff