[time-nuts] TrueTime A-60FS antenna Data Needed
martelno at yahoo.com
Sat Jan 6 23:36:40 EST 2007
I tought it was a GPS antenna...
For WWVB reception, you better wait at nighttime...
I have here a Radio Shack "Atomic" radio controlled
clock and during daytime, i have zero reception, but
at night i'd say, 4 days out of 5, my clock syncs.
I live in Montreal, Canada, so quite far away from
Boulder, CO and my antenna is nailed on an inside wall
in a bungalow. You probably live closer from WWVB than
me, and your antenna looks like an outdoor unit. So
73 de Normand VE2UM
Montreal, Qc. Canada
--- Doug Millar <dougnhelen at moonlink.net> wrote:
> Hi Norman,
> Thanks for you very complete check out
> information. It
> worked! The antenna is an active type with a
> preamp. I also hooked
> it up to a VLF receiver and found it receives very
> well from near DC
> to 100khz. No obvious peak at 60khz.
> Thanks again,
> Doug K6JEY
> At 03:08 PM 1/5/2007, Normand Martel wrote:
> >You could do a simple test:
> >With an ohmmeter, on Diode test and with reversed
> >polarity (Red on shield, black on center pin),
> >the DC resistance on the RF connector. If it's a
> >(< 1 ohm) DO NOT APPLY ANY VOLTAGE ON IT! Your
> >is passive and conducting.
> >If the ohmmeter indicates a diode reading (about
> >the antenna is active and some bias will be
> >to have the antenna work.
> >If the reading is infinite, it is either a passive
> >(open) or active antenna.
> >To further determine the type of antenna, i suggest
> >you to use some length of coax (20-50ft) cable to
> >the antenna away from you, and, using a regulated 5
> >volts power supply with a 1000 ohms SERIES
> >apply power (forward polarity, e.g. positive on
> >pin) to the antenna and measure the voltage across
> >1000 ohm resistor.
> >If you have some voltage across the resistor, this
> >indicates that the antenna preamplifier draws some
> >current and, obviously, the antenna is active. If
> >voltage is present across the 1000 ohms resistor,
> >your antenna is passive.
> >Why the 20-50 foot coax? Simply to put some
> >between you and the antenna. If the preamplifier is
> >turned on by the 1000 ohms bias and the antenna is
> >close from you, the whole thing will start to
> >73 de Normand VE2UM
> >--- Doug Millar <dougnhelen at moonlink.net> wrote:
> > >
> > > Hello,
> > > Hope the New Year is going well. I
> recently got the
> > > above antenna to
> > > use on another receiver, but no data. Does
> > > have a description
> > > of the interface? Is it just a simple ferrite
> > > antenna, or does it
> > > have a preamp and need bias, or "other" ? Any
> > > would be very helpful.
> > > Thanks,
> > > Doug K6JEY
> > >
> > >
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