[time-nuts] Thunderbolt - trouble locking with some types of antennas
Jerry
jsternmd at att.net
Mon Jul 31 17:19:12 UTC 2017
Due to access problems, I run my Thunderbolt with a Symmetricom 58532A
antenna placed indoor near a window facing South
cant get much worse but
most of the time it will be locked onto 3 or 4 satellites. I recently
bought a www.leobodnar.com <http://www.leobodnar.com> GPSDO for my SDR ham
radio setup. I was very surprised to find that this minimalist GPSDO using
a small patch antenna with internal LNA placed near my window had satellite
& PPL lock within a few seconds. It requires 3-4 satellite locks for its
PPL. However, when I attached the patch antenna to my Thunderbolt
satellite signal strength were zero or minus for all satellites. The specs
for the patch antenna are listed below.
I would appreciate any advice understanding this behavior.
Jerry NY2KW
Center Frequency 1575.42MHz±3 MHz
V.S.W.R 1.5:1
Band Width ±5 MHz
Impendence 50 ohm
Peak Gain >3dBic Based on 7×7cm ground plane
Gain Coverage >-4dBic at 90°<0<+90°(over 75% Volume)
Polarization RHCP
LNA/Filter
LNA Gain (Without cable) 28+/-3dB
Noise Figure 1.5dB Typ.
Filter Out Band Attenuation (f° =1575.42MHz)
7dB Min f0+/-20MHZ
20dB Min f0+/-50MHZ
30dB Min f0+/-100MHZ
V.S.W.R <2.0
DC Voltage 2.7V/3.0V/3.3V/5.0V/3.0V to 5.0V/other
DC Current 5mA /11mA/15mA Max
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