Hi Rob I picked up a couple of "mushroom shaped" (white flat top rounded edges prob 70mm diam.) antennas with a small right-angle bracket and a TNC connector (5v supply) no nameplate but they seem to work fine on 20 feet of RG-58.
The manual for the 1804M says its an 8-channel receiver and I recollect it being a Trimble. Alan G3NYK ----- Original Message ----- From: "Robin Kimberley" <[email protected]> To: <[email protected]>; "'Discussion of precise time and frequency measurement'" <[email protected]> Sent: Wednesday, November 02, 2011 9:01 PM Subject: Re: [time-nuts] Monitoring the Rapco 1804M - how antenna changesaffect the unit > 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: [email protected] [mailto:[email protected]] On > Behalf Of Joe Leikhim > Sent: 02 November 2011 18:52 > To: [email protected] > 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: > > http://gpsinformation.net/main/gpsantrev1.htm > > -- > Joe Leikhim > > Leikhim and Associates > Communications Consultants > Oviedo, Florida > > www.Leikhim.com > > [email protected] > > 407-982-0446 > WWW.LEIKHIM.COM > > > _______________________________________________ > time-nuts mailing list -- [email protected] To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > > > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
