[time-nuts] Z3801A Antenna

fre_eng at g4fre.com fre_eng at g4fre.com
Mon Jun 4 16:09:27 EDT 2007

The Oncore 2000  or similar is a good idea. 

The small puck antennas usually dont have any onboard filtering and the 3801 
will lose lock if,  as in my case I transmit 30W of 1296MHz 40' away 

Antennas such as the Oncore 2000  have onboard filtering as they are 
intended to be used in rf polluted environments (ie cell sites)and do not 
suffer this problem. Since changing to one of these "cone antennas" the 
problem has never reoccurred 



Message: 1
Date: Sun, 3 Jun 2007 13:49:56 -0400
From: "michael taylor" <mctylr at gmail.com>
Subject: Re: [time-nuts] Z3801A Antenna
To: "Discussion of precise time and frequency measurement"
	<time-nuts at febo.com>
	<25630a120706031049x3a020357xdf5582d15375ead8 at mail.gmail.com>
Content-Type: text/plain; charset=UTF-8; format=flowed 

On 6/2/07, Bill Janssen <billj at ieee.org> wrote:
> I know this has been discussed recently but am wondering what the
> recommended (cheap but usable )
> antenna would be. I want to give him a recommendation or two. The
> antenna has to be a 5 Volt version
> to match the Z3801A

I actually have been using a el-cheapo generic passive GPS antenna fed
that came with about 10 feet of RG-174 or smaller. With the antenna
placed outside I was able to maintain a GPS lock at least 95% of the
time. Certainly usable while testing or in my case until I get around
to installing my active antenna. The patch antenna useful for initial
testing, as 10 feet is too short for my desired permanent

QST Oct 2002, "An Inexpensive External GPS Antenna"

I ended up purchasing a Oncore 2000 antenna (5V, 25dB) from Ridge
Equipment <http://www.ridgeequipment.com/store/page6.html> that I need
to install still (when there is no risk of thunderstorms). 

 -Michael, VE3TIX 

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