Re: Power line interference?

From: Carsten Kurz (audiovisual_at_t-online.de)
Date: 07/12/04 

Date: Mon, 12 Jul 2004 15:43:34 +0200

Bob Greschke schrieb:

> There is a 10-15 meter 6-conductor cable between the GPS and the recorder
> that needs the timing signal. The recorder gets NMEA and a 1 pps signal
> from the GPS. The GPS board (now Trimble, I think, but going to a Garmin
> board in the near future models), a board with the patch antenna, and an
> interface board are housed in the same small package (weatherproof,
> waterproof, etc.)

For a fixed installation, I would really put the GPS inside the station
and leave only the antenna on the roof.

If the unit outputs NMEA, it should be a problem to log some NMEA data
and see what the problem is.

>From your description, the GPS/Antenna package is more or less D.I.Y,
and, frankly, weatherproof/waterproof may already have been proven wrong
by the receiver performance. There are so many waterproof GPS sensors
out rhere, why not use one of these, if NMEA is everything you need.

BTW - I have seen certain receivers simply loosing lock (and never
regaining) for no apparent reason under full skyview during long logging
sessions. Very often the NMEA showed good C/N for more than enough
satellites, but no fix. The only way to regain a fix was a power cycle.
There must be some weird firmware errors in some consumer devices.
This long term reliability has never been addressed by any
website so far.

- Carsten 

-- 
Audio Visual Systems                          fon: +49 (0)2234 601886
Carsten Kurz                                  fax: +49 (0)2234 601887
Von-Werth-Straße 111                   email: audiovisual@t-online.de
50259 Pulheim / Germany               WGS84:N50°57'50.2" E06°47'28.5"

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