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" <cbr...@woods.net>
To: <time-nuts@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" <kb...@n1k.org>
To: "Bob Stewart" <b...@evoria.net>
Cc: "Time Nuts" <time-nuts@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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