Stand alone DVR time tweak?

DVR MAN · **Joined:** Dec 2007 **Posts:** 101

My 16 channel stand alone DVR time stamp gains around 8 minutes a month. Is there a pot, or any other way to correct this problem?

Soundy · **Posted:** Sun Sep 20, 2009 10:54 am

Without knowing the exact make and model of the DVR, the best anyone here can give you is, "MAYBE."

I'd check to see if it has a time-sync function that allows it to sync periodically with internet-based time servers, like time.nist.gov.

Squiffy · **Joined:** Apr 2009 **Posts:** 165

Maybe

If the option Soundy suggests isn't available, then it's usually a matter of a reference oscillator (usually a crystal) being slightly misaligned.

In the past, such circuitry would have a small trimming capacitor alongside the crystal, but as a cost-cutting measure, it's usually just fixed capacitors these days.

Replacing one of those capacitors with a trimming capacitor and then aligning it exactly on frequency would be required. If the crystal isn't metal encapsulated, then replacing it with one that is will improve long-term stability (less prone to thermal drifting).

suky · **Joined:** Aug 2009 **Posts:** 146 **Location:** illinois

If nothing important in your HDD, try to format HDD and see how it goes.

rory · **Joined:** Nov 2003 **Posts:** 15515 **Location:** Bahamas

LOL @ Squiffy.
If he could do all that then he probably could just build himself a new DVR out of household electronics. :lol:

anyway, gaining is strange, still check the battery if it has one.

thewireguys · **Joined:** Nov 2007 **Posts:** 1533 **Location:** PA

Squiffy wrote:

Maybe

If the option Soundy suggests isn't available, then it's usually a matter of a reference oscillator (usually a crystal) being slightly misaligned.

In the past, such circuitry would have a small trimming capacitor alongside the crystal, but as a cost-cutting measure, it's usually just fixed capacitors these days.

Replacing one of those capacitors with a trimming capacitor and then aligning it exactly on frequency would be required. If the crystal isn't metal encapsulated, then replacing it with one that is will improve long-term stability (less prone to thermal drifting).

LOL...... The forum is full of funny questions and answers tonight :lol:

Squiffy · **Joined:** Apr 2009 **Posts:** 165

> If he could do all that then he probably could just build himself a new DVR out of household electronics

lol - it can be difficult to fit a trimming capacitor as described, even for someone used to such things, so it's a shame that manufacturers/designers cut costs in these ways, what was a straightforward tweak becomes a major hassle.

Probably the most practical solution would be to replace the crystal if it's as described and increase ventilation to keep the internal circuitry less prone to thermal drift.

DVR MAN · **Joined:** Dec 2007 **Posts:** 101

Thank you for your inputs!

DVR MAN · **Joined:** Dec 2007 **Posts:** 101

DVR MAN wrote:

Thank you for your inputs!

Here is the MB........................I cannot add the .jpg! Why?

Squiffy · **Joined:** Apr 2009 **Posts:** 165

I had no luck uploading a jpg here yesterday, I suggest you try a free image hosting site and link to it.

DVR MAN · **Joined:** Dec 2007 **Posts:** 101

DVR MAN wrote:

Thank you for your inputs!

Here is the MB........................I cannot add the .jpg! Why?

This is going to kill the forum input!

I see a "Close all open bbcode tags" command line listed at the top of this note box even though the check box says they are on. The Website should fix that ASAP!

rory · **Joined:** Nov 2003 **Posts:** 15515 **Location:** Bahamas

DVR MAN wrote:

Here is the MB........................I cannot add the .jpg! Why?

it rarely worked from day one, i dont know as im not the admin.
I always use something like www.tinypic.com or my own website hosting.

Rory

Soundy · **Posted:** Wed Sep 23, 2009 4:58 pm

There's a lotta stuff that will probably be fixed when/if they ever upgrade...

DVR MAN · **Joined:** Dec 2007 **Posts:** 101

rory wrote:

DVR MAN wrote:

Here is the MB........................I cannot add the .jpg! Why?

it rarely worked from day one, i dont know as im not the admin.
I always use something like www.tinypic.com or my own website hosting.

Rory

I use thumbs to shrink the pic. See above edit. The site says HMTL is off, BB code is on, Smilies are on. Why is HMTL off, and why does it say BB code is on when it is really off? Don't you tell them what to do?

rory · **Joined:** Nov 2003 **Posts:** 15515 **Location:** Bahamas

DVR MAN wrote:

I use thumbs to shrink the pic. See above edit. The site says HMTL is off, BB code is on, Smilies are on. Why is HMTL off, and why does it say BB code is on when it is really off? Don't you tell them what to do?

Most forums disable HTML for security reasons. Not that it stops people hacking open source PHP forums anyway

BBCode is working, what error are you having?

Code:

if this = that then
    msgbox "yippie!"
end if

Stand alone DVR time tweak?

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