how does a sat box store frequency settingsFor those who wish to discuss the more technical aspects of Satellite receivers and TVs. perhaps how to replace components, fault finding etc. | |
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how does a sat box store frequency settingsFor those who wish to discuss the more technical aspects of Satellite receivers and TVs. perhaps how to replace components, fault finding etc. | |
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21-04-2009
| #1 | ||
| Member Join Date: 09-09-2008 Location: glasgow
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My System: STRONG SRT4400, TEXAT 9300 |
How does the average satellite box hold onto its frequency settings when adminstered by the user... I'm baffled as to why a sat box would reset itself back to factory settings, the RF board here doesn't appear to have any batteries onboard... The question i have is what component (if it isn't a battery) ensures the board holds onto the settings its given .... The only thing i can think of is that an IC may have an internal battery. The box is a Strong 4400  help appreciated | ||
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21-04-2009
| #2 | ||
| Amo Amas Amant Admin  Join Date: 18-11-2004 Location: Blackburn NW England (Siberia)
Posts: 11284
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My System: IDD CI24 ECONO MM Penta 1.20 Galaxy II 1.2Mtr Polar MTG yes it has been on the arc for 21 years and is still driven by a modified wiper motor from a Ford Anglia. It's like me sometimes groans but always performs  Saved us from the black plague of ignoratio elenchi, he awaits a special badge with jugs |
The standard method of storing such detail is to use an EEprom, or to make more of that an Electronically Erasable Programmable Read Only Memory chip. This means that information will only change when the information is written over or flashed. Sometimes they use a cheaper chip and hold the information by charging a capacitor up and feeding the chip, but capacitors do fail as do batteries. There probably are other methods but I am not familair with them, they are not as you correctly mention like a PC Mobo and have a Cmos chip backed up with a battery, but could be using a capacitor as mentioned | ||
| War does not determine who is right, it determines who is left! Formerly toppervte33h whose six pack has turned into a keg Help support this web site by making a donation Or use other options to help support Sats UK Show Your Support by clicking the button  Thank you. Freddie Flintoff is back | |||
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21-04-2009
| #3 | ||
| Member Join Date: 09-09-2008 Location: glasgow
Posts: 9
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My System: STRONG SRT4400, TEXAT 9300 | OK... Am i right to say the capacitor would be keeping the present settings until the sat box is powered back on thus restoring its max charge...Sat boxes must therefore be designed to hold settings for months even when not powered on. The discharge rate must be micro-amperes over that period, i'm guessing there isn't any other circuitry involved to prevent this cap discharging other than its associated CR network. CHEERS! | ||
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21-04-2009
| #4 | ||
| Amo Amas Amant Admin Join Date: 18-11-2004 Location: Blackburn NW England (Siberia)
Posts: 11284
Thanks: 24
Thanked 505 Times in 464 Posts
My System: IDD CI24 ECONO MM Penta 1.20 Galaxy II 1.2Mtr Polar MTG yes it has been on the arc for 21 years and is still driven by a modified wiper motor from a Ford Anglia. It's like me sometimes groans but always performs Saved us from the black plague of ignoratio elenchi, he awaits a special badge with jugs |
I suspect there are one or two user of strong stb's have alook in the workbench and soldering forum on this board if you haven't already found it somebody may have already had a problem http://www.satellites.co.uk/satellit...ering-station/ | ||
| War does not determine who is right, it determines who is left! Formerly toppervte33h whose six pack has turned into a keg Help support this web site by making a donation Or use other options to help support Sats UK Show Your Support by clicking the button Thank you. Freddie Flintoff is back | |||
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21-04-2009
| #5 | ||
| Super Moderator  Real name: Mark Join Date: 17-05-2007 Location: Kent,UK
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My System: TM6800HD, TM1000, TM600 Linux,TM5200, TM2200 motor, Triax TD110 dish + Fortec 85cm. Meter=Satlook Micro+G2 NIT | Flash memory is normally used, and it doesn't need a capacitor as it in non-volatile. | ||
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