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Re: [time-nuts] Difference in GPS antennas

LJ
Lux, Jim (337C)
Sat, Aug 15, 2009 10:34 PM

On 8/15/09 3:25 PM, "Chuck Harris" cfharris@erols.com wrote:

Lux, Jim (337C) wrote:

On 8/15/09 8:27 AM, "Magnus Danielson" magnus@rubidium.dyndns.org wrote:

If you're near a harbor with fishing boats, you'll see plenty of quad
helices about a half a meter in overall height, used for VHF Weather
satellite reception.  They're also used on spacecraft (Mars Science Lander,
Mars Reconnaissance Orbiter, and Phoenix all have UHF quad helix antennas,
I
think, for about 400 MHz)

Not used by the fishing vesels near me...

Really?  Practically all the fishing boats (mostly squid) boats going out
from Ventura Harbor (in Southern California) have big ol' quad helix
antennas up on the cross bar (as well as the usual HF SSB and VHF whips and
the radar).  Maybe it's a regional preference thing (or folks are going to
the 1.6 GHz band or something).

Haven't all of the VHF weather satellites been decommissioned?

Could be. I suspect that those antennas have been up on those boats for
decades.

On 8/15/09 3:25 PM, "Chuck Harris" <cfharris@erols.com> wrote: > Lux, Jim (337C) wrote: >> >> >> On 8/15/09 8:27 AM, "Magnus Danielson" <magnus@rubidium.dyndns.org> wrote: >> >> >>>> If you're near a harbor with fishing boats, you'll see plenty of quad >>>> helices about a half a meter in overall height, used for VHF Weather >>>> satellite reception. They're also used on spacecraft (Mars Science Lander, >>>> Mars Reconnaissance Orbiter, and Phoenix all have UHF quad helix antennas, >>>> I >>>> think, for about 400 MHz) >>> Not used by the fishing vesels near me... >> >> Really? Practically all the fishing boats (mostly squid) boats going out >> from Ventura Harbor (in Southern California) have big ol' quad helix >> antennas up on the cross bar (as well as the usual HF SSB and VHF whips and >> the radar). Maybe it's a regional preference thing (or folks are going to >> the 1.6 GHz band or something). > > Haven't all of the VHF weather satellites been decommissioned? Could be. I suspect that those antennas have been up on those boats for decades.
DI
David I. Emery
Sat, Aug 15, 2009 10:50 PM

On Sat, Aug 15, 2009 at 03:34:29PM -0700, Lux, Jim (337C) wrote:

Haven't all of the VHF weather satellites been decommissioned?

Could be. I suspect that those antennas have been up on those boats for
decades.

Hardly, there are still the old analog APT satellites in operation

plus at least one using digital (LRIT)....


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--
Dave Emery N1PRE/AE, die@dieconsulting.com  DIE Consulting, Weston, Mass 02493
"An empty zombie mind with a forlorn barely readable weatherbeaten
'For Rent' sign still vainly flapping outside on the weed encrusted pole - in
celebration of what could have been, but wasn't and is not to be now either."

On Sat, Aug 15, 2009 at 03:34:29PM -0700, Lux, Jim (337C) wrote: > > Haven't all of the VHF weather satellites been decommissioned? > > Could be. I suspect that those antennas have been up on those boats for > decades. Hardly, there are still the old analog APT satellites in operation plus at least one using digital (LRIT).... > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. -- Dave Emery N1PRE/AE, die@dieconsulting.com DIE Consulting, Weston, Mass 02493 "An empty zombie mind with a forlorn barely readable weatherbeaten 'For Rent' sign still vainly flapping outside on the weed encrusted pole - in celebration of what could have been, but wasn't and is not to be now either."
MD
Magnus Danielson
Sat, Aug 15, 2009 10:56 PM

Lux, Jim (337C) wrote:

On 8/15/09 3:25 PM, "Chuck Harris" cfharris@erols.com wrote:

Lux, Jim (337C) wrote:

On 8/15/09 8:27 AM, "Magnus Danielson" magnus@rubidium.dyndns.org wrote:

If you're near a harbor with fishing boats, you'll see plenty of quad
helices about a half a meter in overall height, used for VHF Weather
satellite reception.  They're also used on spacecraft (Mars Science Lander,
Mars Reconnaissance Orbiter, and Phoenix all have UHF quad helix antennas,
I
think, for about 400 MHz)

Not used by the fishing vesels near me...

Really?  Practically all the fishing boats (mostly squid) boats going out
from Ventura Harbor (in Southern California) have big ol' quad helix
antennas up on the cross bar (as well as the usual HF SSB and VHF whips and
the radar).  Maybe it's a regional preference thing (or folks are going to
the 1.6 GHz band or something).

Haven't all of the VHF weather satellites been decommissioned?

Could be. I suspect that those antennas have been up on those boats for
decades.

I think this explains fairly well why I haven't seen them. VHF weather
satellite reception has not been necessary for most fishing vesels on
the Baltic sea, especially those doing near coast fishing. National
weather services have sufficed for many decades, and before that looking
out the window and a barometer did alot anyway for the fishermens I know.

Cheers,
Magnus

Lux, Jim (337C) wrote: > > > On 8/15/09 3:25 PM, "Chuck Harris" <cfharris@erols.com> wrote: > >> Lux, Jim (337C) wrote: >>> >>> On 8/15/09 8:27 AM, "Magnus Danielson" <magnus@rubidium.dyndns.org> wrote: >>> >>> >>>>> If you're near a harbor with fishing boats, you'll see plenty of quad >>>>> helices about a half a meter in overall height, used for VHF Weather >>>>> satellite reception. They're also used on spacecraft (Mars Science Lander, >>>>> Mars Reconnaissance Orbiter, and Phoenix all have UHF quad helix antennas, >>>>> I >>>>> think, for about 400 MHz) >>>> Not used by the fishing vesels near me... >>> Really? Practically all the fishing boats (mostly squid) boats going out >>> from Ventura Harbor (in Southern California) have big ol' quad helix >>> antennas up on the cross bar (as well as the usual HF SSB and VHF whips and >>> the radar). Maybe it's a regional preference thing (or folks are going to >>> the 1.6 GHz band or something). >> Haven't all of the VHF weather satellites been decommissioned? > > Could be. I suspect that those antennas have been up on those boats for > decades. I think this explains fairly well why I haven't seen them. VHF weather satellite reception has not been necessary for most fishing vesels on the Baltic sea, especially those doing near coast fishing. National weather services have sufficed for many decades, and before that looking out the window and a barometer did alot anyway for the fishermens I know. Cheers, Magnus