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Discussion Starter · #1 ·
Hi!

I have a problem in these HD days. I use a Barcovision 1609s and it only accepts scan freq. 30-35kHz+60-64kHz. Now I want to use [email protected], that works on 60Hz but @ 50 Hz it will only be 27kHz and I'll get no piqture. Does anybody out there know if there is a mod available? (And what is it that makes these limitations, I mean, after all it accepts 64kHz wich wors fine if I use the HTPC)
 

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the 1609s was a budget version of the 1209s.


It was intentionally limited to the frequency ranges that you listed to allow it to support NTSC/PAL line doubling and quadrupling.


Fortunately 1080i59.94 is inside that range, as should be 1080p47.952
 

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Discussion Starter · #3 ·
How should it be @ 1080p47.952?

And there is another problem with 1080p that is the bandwith of max 60MHz, wich means that only 1080i would be suitable. Of course quadrupling is OK but @ these resolutions the horisontal resolution is only 720 wich gives of course a lower bandwith.
 

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brightness: 1600 lumens at 10 % peak white

ANSI lumens:

Economy mode: 210 ANSI lumens

Normal mode: 270 ANSI lumens

Boost mode: 310 ANSI lumens


Minimal retrace time

Horizontal: 3.3 μs

Vertical: 300 μs



1209s:

Light output

At 10 % peak white: 1,250 lumens

ANSI(1)

Economy mode: 195 lumens

Normal mode: 240 lumens

Boost mode: 270 lumens


Minimal retrace time

Horizontal:

(switching point adjustable

between 64 and 94 kHz)

Vertical:

RGB bandwidth

120 MHz [-3 dB]
 

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Quote:
Originally Posted by papegoja
How should it be @ 1080p47.952?
You're right. I remembered some wrong numbers here (thought it needed around 64 kHz).

1080p47.952 actually needs around 54 kHz and thus will not work on a 1609s
 

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Quote:
Originally Posted by kschmit2
Fortunately 1080i59.94 is inside that range...
Last I checked, 1080i @ 59.94Hz is around 33.75Khz scanrate. This is higher then the 30-32Khz that the unit will do, no?


Kal
 

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Kal,


from the BV1609s brochure (do you need it for "your" site?):


Scan frequencies

Horizontal: 15-18, 30-35,

60-64 kHz autolock

Vertical: 37-200 Hz autolock


Kai
 

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Maybe the circuit could be modded to accept 27-32kHz and 56-60kHz...

Roland
 

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Discussion Starter · #12 ·
Yeah, maybe it could, do you know anyone to ask?

Actually it would be awsome if it coul do 27-25kHz.

It's so anoying that it can do 64kHz but not 27... :mad:


Maybe I bought the wrong one but 2500$ with only 400 hours looked fine to me.. and the piq from 576p is ok. Maybe i should try [email protected] on PAL discs on my HTPC with powerstrip??
 

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Hey, if you have a HTPC and Powerstrip it should be doable.

You can use 47.592Hz or 50Hz and increase the vertical porches while locking resolution and vertical frequency. This will increase your horizontal frequency. Go on until the PJ locks and add a few percent of horizontal frequency to keep a safety margin on the sync lock circuits.

Roland
 

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Yes - I was going to recommend this. It's fairly easy to play with the scanrate with powerstrip by simply adding/removing top/bottom porch settings (extra lines before and afte the active image area used for stabilization).


If you're close already then it shouldn't be a problem.


Kal
 
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