[time-nuts] Z3815A Antenna Pad Query
azelio.boriani at screen.it
Mon Aug 13 22:44:16 UTC 2012
Well, the TBolt measures 1086OHM on the antenna connector with a test
voltage of 3V (2K range on the multimeter) and open circuit when switching
to 20K range with 800mV test voltage, positive on antenna and negative on
GND. The Motorola M12 has 1940OHM (2K) and open on 20K. The uBlox LEA-5T is
open (2K and 20K) and the Navsync CW12 is the same.
On Tue, Aug 14, 2012 at 12:17 AM, Azelio Boriani
<azelio.boriani at screen.it>wrote:
> Which type of ohmmeter have you used? What voltage does it use to make the
> measure? What polarity? If the voltage is greater than 700mV and the
> positive was put on ground maybe some diode has turned on... anyway 2.5K on
> 5V is 2mA. I have never made such a test on a GPS receiver. I can try on a
> TBolt since it is off now.
> On Mon, Aug 13, 2012 at 11:40 PM, Jerry <jsternmd at att.net> wrote:
>> I am new to the group. Recently got a Z3815A (module type) and was
>> at ZL1BPU's User Guide. Don't ask me why but before I soldered a BNC coax
>> to the bottom antenna pads I checked them with an ohmmeter and found 2.5K
>> across the signal pad and ground. I was surprised since there will be a
>> 5VDC across them when powered. I don't have a schematic . is this
>> Perhaps someone with a ZA3815A can put an ohmmeter across their antenna
>> connector and confirm if normal finding? I am reluctant to power it up
>> if a
>> potential problem exists that I could make worse.
>> Much appreciated
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