[time-nuts] To use or not to use transmission line splitters for GPS receivers

Robert Atkinson robert8rpi at yahoo.co.uk
Tue Oct 9 07:14:17 EDT 2012

When GPS first started to be fitted to light aircraft it was found that LO leakage from some VHF navigation recivers blocked the GPS when the NAV was on certain channels. You can buy a BNC "T" adaptor where the leg of the T is a 1.5GHz coax stub notch filter. They go on the NAV RX antenna connector.
Robert G8RPI.

From: gary <lists at lazygranch.com>
To: time-nuts at febo.com 
Sent: Tuesday, 9 October 2012, 8:51
Subject: Re: [time-nuts] To use or not to use transmission line splitters for GPS receivers

I was wondering about that myself, but my guess is the crosstalk would be from whatever grunge was coming from the other GPS. Every amplifier has reverse parameters, so a small amount of the crud (circuitry noise) from one GPS will reach the other GPS. Not much, but some people are nuts about time.

This is a bigger problem with radios, where the locals from one radio can reach the input to the other radio.

I was also confused on the notion of a transmission line splitter. Is this a Wilkinson or something else?

On 10/9/2012 12:40 AM, Azelio Boriani wrote:
> Crosstalk? With the same signal?

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