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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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| Posted: Mon Mar 02, 2015 2:44 pm Post subject: |
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The one thing that is confusing is the manual states that one or more are switched in or out.
So at say 72 hz, are both C119 and C120 in the circuit or just C119( for the red channel) . I asked Scott in that thread and he said yes it is in the circuit but it is vague to if C120 is also in it or even if C118 also stays in the circuit?
I guess I'll have to use my extender boards now and measure those caps at the internal frequency changes to see whats used.
Nashou
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barclay66
Joined: 27 Jun 2011
Posts: 1304
Location: Germany
TV/Projector: Marquee 9500 Ultra
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| Posted: Mon Mar 02, 2015 4:05 pm Post subject: |
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Hi,
With 45.6µH for the coil the calculator spits out a capacitor value of 122.17nF.
But as Scott says: Theory and simulation need to be proven by reality...
Regards,
barclay66
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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| Posted: Mon Mar 02, 2015 4:17 pm Post subject: |
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| barclay66 wrote: | Hi,
With 45.6µH for the coil the calculator spits out a capacitor value of 122.17nF.
But as Scott says: Theory and simulation need to be proven by reality...
Regards,
barclay66 |
Hmm Interesting.
if the caps are switched in and if its C118 and C119 plus the permanent cap c117 it comes to 123nf !!!
Now was that for 72hz right?
so we have t find out if the res 0 cap stays in circuit with 72hz. If not then we have to re size either C119 or
C117 which is the permanent one always in circuit.
Nashou
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barclay66
Joined: 27 Jun 2011
Posts: 1304
Location: Germany
TV/Projector: Marquee 9500 Ultra
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| Posted: Mon Mar 02, 2015 9:09 pm Post subject: |
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Yeah, we need to get some measurements from those three control lines at different resolutions. I could do that on the weekend maybe...
Regards,
barclay66
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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| Posted: Mon Mar 02, 2015 9:20 pm Post subject: |
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| barclay66 wrote: | Yeah, we need to get some measurements from those three control lines at different resolutions. I could do that on the weekend maybe...
Regards,
barclay66 |
I might try tonight.
We can measure on the drain of the IRF520's
Scott also told me the best increase you can get in adjustment from the static and or the dynamic is to reduce the resistance of the coil but keep the inductance the same. this would need to be done with thicker coil windings.
Athanasios
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dvh99
Joined: 25 Dec 2009
Posts: 2158
Location: nederland
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| Posted: Tue Mar 03, 2015 2:09 am Post subject: |
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and those are the high current ones or you could wind them yourself.
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marquee 9500ultra HD10L moome hdmi1.3 v3+ some mods.
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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barclay66
Joined: 27 Jun 2011
Posts: 1304
Location: Germany
TV/Projector: Marquee 9500 Ultra
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| Posted: Tue Mar 03, 2015 8:44 am Post subject: |
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Hi,
Just found out that You don't need fiddling with the FGM board for measuring the band switch signals.
They are generated on the DBP and can be measured at its connector to the CLM. Signals are inverted, so zero volts means the corresponding line is active.
Interesting: Four signals (BAND-SW0/BAND-SW2/BAND-SW3/BAND-SW4) are generated but only three (BAND-SW0/BAND-SW2/BAND-SW4) are being used for switching the capacitors...
Regards,
barclay66
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dvh99
Joined: 25 Dec 2009
Posts: 2158
Location: nederland
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| Posted: Tue Mar 03, 2015 12:05 pm Post subject: |
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| Nashou66 wrote: | | dvh99 wrote: | | and those are the high current ones or you could wind them yourself. |
I am talking about the focus coil in my last post.
Nashou |
stupid posts happen when one person has had some whiskeys too many 
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mp20748
Joined: 12 Sep 2006
Posts: 5689
Location: Maryland
TV/Projector: 9500LC Ultra / Super 02 and 03 VIM
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| Posted: Tue Mar 03, 2015 12:21 pm Post subject: |
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For anyone using the Barco 909 focus coils in a Marquee, change the following resistors for better Static focus range and best overall focus
R138, R238, R338 from 4.7 ohm to 4.0 ohm 1 %
Also remove R145, R245, R345
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redfox001
Joined: 16 Mar 2009
Posts: 2257
Location: The Netherlands
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| Posted: Tue Mar 03, 2015 12:27 pm Post subject: |
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| mp20748 wrote: | For anyone using the Barco 909 focus coils in a Marquee, change the following resistors for better Static focus range and best overall focus
R138, R238, R338 from 4.7 ohm to 4.0 ohm 1 %
Also remove R145, R245, R345 |
Thanks I am going to try this when I get to it.
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mp20748
Joined: 12 Sep 2006
Posts: 5689
Location: Maryland
TV/Projector: 9500LC Ultra / Super 02 and 03 VIM
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| Posted: Tue Mar 03, 2015 12:48 pm Post subject: |
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You have Barco 909 coils?
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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| Posted: Tue Mar 03, 2015 2:57 pm Post subject: |
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| barclay66 wrote: | Hi,
Just found out that You don't need fiddling with the FGM board for measuring the band switch signals.
They are generated on the DBP and can be measured at its connector to the CLM. Signals are inverted, so zero volts means the corresponding line is active.
Interesting: Four signals (BAND-SW0/BAND-SW2/BAND-SW3/BAND-SW4) are generated but only three (BAND-SW0/BAND-SW2/BAND-SW4) are being used for switching the capacitors...
Regards,
barclay66 |
Jorge,
I don't agree here, the band switch send a voltage to the drivers then the drivers to the gates.When the gate sees that voltage it brings the corresponding cap into the circuit to keep current stable and reduce the need for increasing the voltage to the amp. So a constant voltage increase is not needed to keep current up. The caps store the energy for the amp. Or at least thats is how I interpret the passage below.
And, only 3 bands are used. SW0 SW2 SW4
The drivers get the signal from the CLM as seen here:
Then those drivers switch the gates to allow a certain cap to be put in the circuit along with cap x17
as seen here:
I tried last night but was finding it hard to get the scope probe on the resistors R135,R136 and R137
I wanted to have all three on the scope at the same time. So I was attempting to hold two probes on two resistors but was hard to do with the scopes behind and the side of me. I didnt want to short anything out.
I need to solder a wire or get finer probe clamp ends for the delicate stuff.
But I think the large cap is switched out at higher internal frequencies I tested. My moome external power supply took
a dump so i couldn't use my Lumagen HDQ to test 800p@72.
I'll try more today if I have time.
Athanasios
_________________
Don't blame your underwear for your crooked ass~ unknown Greek philosopher
"Republicans believe every day is the Fourth of July, but the Democrats believe every day is April 15." --- President Reagan
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barclay66
Joined: 27 Jun 2011
Posts: 1304
Location: Germany
TV/Projector: Marquee 9500 Ultra
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| Posted: Tue Mar 03, 2015 8:39 pm Post subject: |
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Hi,
The signals arriving at the FGM are inverted. You can see this at two locations:
- The signal lables (their 'names') have a line on top. This labeling indicates that the line is active on a 'low' signal (=0V)
- The MOSFET transistors on Your first schematic excerpt (Q1, Q3 and Q5) are being used as inverters. On a 'high' level (=5V) they switch on and pull the output against GND. With a 'low' at the input they stay open and the outputs are pulled up through the resistors over there.
So You will be able to monitor the band switching at the DBP too. It's just that 'OFF' means 'ON' and vice versa over there...
Regards,
barclay66
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redfox001
Joined: 16 Mar 2009
Posts: 2257
Location: The Netherlands
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| Posted: Tue Mar 03, 2015 8:45 pm Post subject: |
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| mp20748 wrote: | | You have Barco 909 coils? |
Yes!
I have a spare 809 that has barco 9 inch lug tubes with the coils. They just lay here and I should try them on the Marquee.
But I have to figure out the focus and astig wiring.
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mp20748
Joined: 12 Sep 2006
Posts: 5689
Location: Maryland
TV/Projector: 9500LC Ultra / Super 02 and 03 VIM
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| Posted: Tue Mar 03, 2015 8:54 pm Post subject: |
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The 809 is a different chassis from the 909. Are you sure it has the same coils?
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redfox001
Joined: 16 Mar 2009
Posts: 2257
Location: The Netherlands
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| Posted: Tue Mar 03, 2015 8:55 pm Post subject: |
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| mp20748 wrote: | | The 809 is a different chassis from the 909. Are you sure it has the same coils? |
The only difference I can find is that the 6 pole astig coils are not there but the other coils seem exactly the same.
I can measure the inductance and resistance of these coils to be sure and compare with my Cine 9.
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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| Posted: Tue Mar 03, 2015 9:34 pm Post subject: |
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| barclay66 wrote: | Hi,
The signals arriving at the FGM are inverted. You can see this at two locations:
- The signal lables (their 'names') have a line on top. This labeling indicates that the line is active on a 'low' signal (=0V)
- The MOSFET transistors on Your first schematic excerpt (Q1, Q3 and Q5) are being used as inverters. On a 'high' level (=5V) they switch on and pull the output against GND. With a 'low' at the input they stay open and the outputs are pulled up through the resistors over there.
So You will be able to monitor the band switching at the DBP too. It's just that 'OFF' means 'ON' and vice versa over there...
Regards,
barclay66 |
oops I see it now, the voltage on the drivers gets pulled to ground if the band switch is on.
If no signal from the drivers then the gate will stay open keeping the cap out of the circuit.
If there is no signal from the clm then the voltage does not get pulled to GND and closes the gate
putting the cap into the circuit.
I missed that the source on the drivers goes to GND. 
nashou
_________________
Don't blame your underwear for your crooked ass~ unknown Greek philosopher
"Republicans believe every day is the Fourth of July, but the Democrats believe every day is April 15." --- President Reagan
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CSX
Joined: 11 Feb 2015
Posts: 142
Location: Ohio
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| Posted: Sat Mar 14, 2015 4:52 pm Post subject: |
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Has there been any further progress on this?
Still keeping an eye here.
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CxTurbo
Joined: 13 Oct 2008
Posts: 425
Location: Ontario, Canada
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| Posted: Sun Mar 15, 2015 2:49 pm Post subject: |
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I finally got around to finishing my FCM. I installed these inductors last and in fact did have to to re-adjust the RGB focus. So there was a change somewhere. I notice I was able to get the lines much sharper as almost all of the flare is gone now.
Would the HDM also benefit from the same inductors on the 4 power rails I wonder?
I talked with Nash a long time ago but still need to do the CLM and finish my VIM.
Now if I could just figure out the damn Lumagen and get rid of the Jutter in the image. It really is an annoyance I could live without.
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