[time-nuts] Monitoring the Rapco 1804M - how antenna changes affect the unit

Robin Kimberley robkimberley at btinternet.com
Wed Nov 2 17:01:54 EDT 2011

The ET6000 used Trimble Bullet antennae when I was selling them in the UK. I
seem to remember about 35db of gain in that antenna.

Rob Kimberley

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Joe Leikhim
Sent: 02 November 2011 18:52
To: time-nuts at febo.com
Subject: [time-nuts] Monitoring the Rapco 1804M - how antenna changes affect
the unit

I tried a similar Garmin antenna with my Datum ET6000 and the lock times
were really long, even with the antenna on a 14 foot pole above the roof.  I
attribute a lot of this to the long 8 ft RG174 style coax pigtail. I have to
wonder if the gain of the preamp as published actually includes the inherent
cable loss, and even if so the preamp must be screaming in gain to make up
for the loss. I intend to get a proper antenna.

Here is a comparison of specs of these type antennas:


Joe Leikhim

Leikhim and Associates
Communications Consultants
Oviedo, Florida


JLeikhim at Leikhim.com


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