Bias T yes, but also a light load on the receiver antenna jack to let the
receiver know there is an external antenna and thus switch from the internal
patch antenna to the external antenna jack. I determined the required load
resistance by using a resistance box coupled to the antenna and starting at
50K, lowering the resistance until the receiver switched - at which time all
of the signals disappeared. DO NOT GO BELOW ABOUT 200 OHMS.
John WA4WDL
--------------------------------------------------
From: "David McGaw" <[email protected]>
Sent: Tuesday, April 10, 2012 12:29 AM
To: "Discussion of precise time and frequency measurement"
<[email protected]>
Subject: Re: [time-nuts] 5V GPS antenna on 3.3V device?
Yes, a bias T is needed. The same is true for some hand-helds like the
Garmin GPS-60CSx which also only put out 3V. 5V antennas like the Synergy
VIC-100 have very low gain at 3V.
73,
David N1HAC
On 4/9/12 11:29 PM, [email protected] wrote:
How's the best way to run an older 5V antenna with the new 3.3V GPS
engines? Bias T?
N0UU
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