[time-nuts] Lucent KS-24361/Z3812A GPSDO initial setup

Christopher Brown cbrown at woods.net
Sun Oct 26 04:11:03 EDT 2014


Ahh, I read "adjust the regulated float power supply to 28 volts" as
including the protection diode as part of the PS and 28VDC straight to
batteries.

Have a half built setup like this on the bench right now.

36VDC unreg supply feeding 2 LM317 regulators with 5amp diodes on output.

Once floats a series pair of small 12v gelcells at 27.2 and the other a
single at 13.6

Need to get the enclosure and the AC filters done, they will be 24/7
powering 10811B type OCXO I want to setup as a standalone ref.


On 10/25/14, 5:54 PM, Tom Miller wrote:
> I really don't disagree with you. I did say run the supply at 28.0 and use a 
> diode off the supply to the battery. That would place the float voltage at 
> 27.3 or so. Best would be to follow the manufacturers float service 
> recommendations. Ideally it should also be temperature compensated with 
> a -2.4 mV/°C slope. Not a problem with how we use these in the lab though.
> 
> And yes to get the longest run time, just power the main unit from the 
> battery as Bob suggested.
> 
> Now I am just waiting on some DB-9 connectors. I ran out of them and the 
> local RatShak went TU.
> 
> Tom
> 
> ----- Original Message ----- 
> From: "Christopher Brown" <cbrown at woods.net>
> To: <time-nuts at febo.com>
> Sent: Saturday, October 25, 2014 5:32 PM
> Subject: Re: [time-nuts] Lucent KS-24361/Z3812A GPSDO initial setup
> 
> 
>>
>> Might want to dial that back a bit.
>>
>> Since 12V/7ah batteries are mentioned I am assuming standard small
>> gelcell units.
>>
>> Proper float voltage for a deep cycle is lower than a SLI type, and
>> gellcell even lower.
>>
>> Generally 13.6 - 13.8 would be the gellcell range, with 13.6 being right
>> on for long life use of _small_ batteries.  Equalizing charge wold be 14
>> - 14.2.
>>
>> Floating a small gelcell at 13.6 (27.2) v.s. 14 can mean the diff
>> between 12 - 24 months v.s. 5 - 7 years service life.
>>
>> On 10/25/14, 11:39 AM, Tom Miller wrote:
>>> These units are ideal for powering via a float charged lead acid battery.
>>> Use two 12 volt / 7 AH batteries in series and adjust the regulated float
>>> power supply to 28.0 volts. Be sure to use a diode from the supply to the
>>> battery just in case the supply can't be back fed during a power fail.
>>>
>>> Tom
>>>
>>>
>>>
>>> ----- Original Message ----- 
>>> From: "Bob Camp" <kb8tq at n1k.org>
>>> To: "Bob Stewart" <bob at evoria.net>
>>> Cc: "Time Nuts" <time-nuts at febo.com>
>>> Sent: Saturday, October 25, 2014 3:01 PM
>>> Subject: Re: [time-nuts] Lucent KS-24361/Z3812A GPSDO initial setup
>>>
>>>
>>>> Hi
>>>>
>>>> Spend the effort, get an antenna outside the house. Beg / borrow / steal 
>>>> a
>>>> UPS. Even a brand new one is less than you paid for the 3812.
>>>>
>>>>
>>>> Bob
>>>>
>>>>
>>>>
>>>
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