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 _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
