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Thread: Switch is not switching

  1. #31
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    What is the model number of the EMP switch??
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    Quote Originally Posted by Terryl View Post
    The receiver will only take as much DC current from the external DC power supply as needed to run the receiver and attached equipment.

    If the old AC to DC power adapter was rated at 12 VDC 2 amps you can use one rated at 12 VDC 5 amps or more and it will not hurt anything, as long as you don't go over the 12 volt DC rating (plus or minus a half a volt) you will be safe, I have a ton of stuff running on a 12 VDC 50 amp supply without problems, they all connect to a DC distribution buss with the proper fusing for each attached device, this saves on tons of AC to DC adapters lying around in the radio cabinet.

    This is what I use for the power to all my DC stuff.

    Code:
    https://powerwerx.com/west-mountain-radio-rigrunner-4005
    True dat....you could use a 12volt 750 amp car battery.The circuit being used determines the current...not the power supply

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    Quote Originally Posted by Terryl View Post
    What is the model number of the EMP switch??
    Centauri S8/1PCN-3

    Specs say 50 mA consumption and 400 mA current pass.

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    If you look at the DC voltage spec's it says +18 volts DC from the receiver, if your receiver is still using the +13 and + 18 volt switching, (+14 = V, +18 = H, legacy type) the switch could have a DC power problem when the receiver is trying to look at a transponder that is in the +14 volt range.

    I would E-mail them and ask what is the lowest DC voltage it will run on, and also does it supply DC power to all attached LNB's at the same time or only when it's switched to that LNB input, and is the 400 mA a maximum through the switch or out from each LNB input port??.

    If all are on at the same time then it's a DC current problem from the receiver.

    If it will not run too good below the +18 volt power requirement then you need to find out if your receiver is trying to switch via the +14 and + 18 volt legacy option
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    Quote Originally Posted by Terryl View Post
    If you look at the DC voltage spec's it says +18 volts DC from the receiver, if your receiver is still using the +13 and + 18 volt switching, (+14 = V, +18 = H, legacy type) the switch could have a DC power problem when the receiver is trying to look at a transponder that is in the +14 volt range.

    I would E-mail them and ask what is the lowest DC voltage it will run on, and also does it supply DC power to all attached LNB's at the same time or only when it's switched to that LNB input, and is the 400 mA a maximum through the switch or out from each LNB input port??.

    If all are on at the same time then it's a DC current problem from the receiver.

    If it will not run too good below the +18 volt power requirement then you need to find out if your receiver is trying to switch via the +14 and + 18 volt legacy option
    My understanding is that anything under 15 volts causes the LNB to switch to vertical polarity and over 15 volts will switch to horizontal. I put a multimeter on my receiver and read 13.1 volts on a vertical and 17.8 on a horizontal so that is well within specs. This is also sufficient to power the diseqc, it's operating range is 10 - 20 vdc. I believe the diseqc commands are modulated onto the dc as a series of 22 kHz pulses to switch LNB's.

    What I don't know is whether or not all LNB's are powered up at all times or only the one on the selected switch port. If all are powered then definitely the rcvr power supply is over taxed. I'm not sure what an LNB draws but likely 75 -100 mA each plus the 50 mA for the switch. Would be nice to make a breakout cable and put an ammeter inline.

    All I know is my receiver was switching fine for years and suddenly it stopped, all I did was replace the AC/DC adapter and now it is working so far... All I can think of is that the old adapter was failing and could not supply the needed current. Who knows?

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    You can't measure the DC amperage on an active high frequency RF circuit without some very special equipment to keep the system up and running. (true voltage and current measurement on an active system)

    Even putting a DVM in the circuit would cause a false reading, I used a specially modified OEM receiver to do measurements like this.

    The DC voltage and DC current measurements were done at the LNB power supply circuit inside the receiver, this way it didn't affect the signals.

    As to the power dongle, it could have been putting out some higher then normal AC ripple, (bad internal electrolytic caps), this would fubar most DC systems.
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    Quote Originally Posted by dogdayz View Post
    My understanding is that anything under 15 volts causes the LNB to switch to vertical polarity and over 15 volts will switch to horizontal. I put a multimeter on my receiver and read 13.1 volts on a vertical and 17.8 on a horizontal so that is well within specs. This is also sufficient to power the diseqc, it's operating range is 10 - 20 vdc. I believe the diseqc commands are modulated onto the dc as a series of 22 kHz pulses to switch LNB's.

    What I don't know is whether or not all LNB's are powered up at all times or only the one on the selected switch port. If all are powered then definitely the rcvr power supply is over taxed. I'm not sure what an LNB draws but likely 75 -100 mA each plus the 50 mA for the switch. Would be nice to make a breakout cable and put an ammeter inline.

    All I know is my receiver was switching fine for years and suddenly it stopped, all I did was replace the AC/DC adapter and now it is working so far... All I can think of is that the old adapter was failing and could not supply the needed current. Who knows?
    Some receivers have the ability to turn off an LNB when not in use, I know the old CNX receivers had that ability which was a great feature but you will have to check the settings on yours........

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    If you still have the old power dongle you could test it with a power resistor and a DVM set to measure AC voltage, a 12 ohm 20 watt resistor would draw 1 amp from the dongle, this would give it enough DC current draw to measure the AC ripple on it, anything over a quarter to a half a volt AC and it could have been the problem, too much junk in the DC buss.
    Last edited by Terryl; 12-28-2018 at 02:44 AM.
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    Quote Originally Posted by Terryl View Post
    If you still have the old power dongle you could test it with a power resistor and a DVM set to measure AC voltage, a 12 ohm 20 watt resistor would draw 1 amp from the dongle, this would give it enough DC current draw to measure the AC ripple on it, anything over a quarter to a half a volt AC and it could have been the problem, too much junk in the DC buss.
    I gave it a try this morning, looks like I'm getting about 0.64 vac ripple so you may be right.

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    Yup....That's a bit too much for a DC circuit, too much AC on the DC buss can filter through and affect the Diseqc commands, (and other things) as they are transmitted on a low level 22 kHz RF carrier, if too much AC ripple is in the mix the carrier wave out to the LNB/switch can be affected.

    The use of an external DC power supply negates the internal filtering (electrolytic caps) used by an internal AC to DC power supply, the receiver relies on the external supply to do all the DC filtering, where as the receiver with an internal power supply has it's own DC filtering cap's.

    The best way to keep this from happening again would be to get a higher quality, higher amperage power dongle, the higher amperage supply will have less strain then one rated to just be able to run the receiver at it's normal DC current spec's.

    When I designed circuits I used the 2 to 1 ratio for the power requirement, if the circuit needed 1 amp DC to run on a normal load, then I used a 2 amp DC supply to power it.

    Take a look at the receivers power requirements, and also the LNB(s) and switches current requirements, add then together then do the 2 to 1 for the replacement power dongle.
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    Still working good with my replacement adapter.
    I'm using an old Dell PC power brick. It's 12v at 3 amps. Probably much better filtering than the original dreamlink supply.

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    The adapter that comes with the DL'S fails, it is the #1 problem with them,
    Lionking posted about it, he did extensive work on the issue including finding a solution for it

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    Quote Originally Posted by auggie View Post
    The adapter that comes with the DL'S fails, it is the #1 problem with them,
    Lionking posted about it, he did extensive work on the issue including finding a solution for it
    he got his worn out watching too much porn

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    Quote Originally Posted by dogdayz View Post
    Still working good with my replacement adapter.
    I'm using an old Dell PC power brick. It's 12v at 3 amps. Probably much better filtering than the original dreamlink supply.
    If it's working then don't mess with anything else.
    ♫♫♫ I’m a lumberjack and I’m OK ♫♫♫ I drink all night and sleep all day. ♫♫♫



    Coming soon to a crop circle near you.....

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    Quote Originally Posted by Terryl View Post
    If it's working then don't mess with anything else.
    Words of wisdom!

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