The first picture shows the unit with the 8.5 x 6.5 cm single-sided PCB ground plane attached with double-sided tape. It definitely helped make indoors reception in my shack much more reliable. In addition to the improved conditions for the patch antenna, it probably helps too that the antenna now is shielded from the digital circuitry of the GPS module, the 10 MHz pulse shaper, and the USB interface. I also added a small LED to the right so that I could see from the outside whether the GPS locks properly.
The second picture shows the interior prior to adding the ground plane.
- Just good enough 10 MHz reference (3 Oct 2015)
- Better with SMA (15 Oct 2015)
- Curing amnesia in the 10 MHz GPS reference (19 Nov 2015)
The post Improved GPS reception with a ground plane first appeared on the LA3ZA Radio & Electronics page.
Excellent article Just down loaded the UBLOX PROGRAM AND HAVE ATTEMPTED to get the 10Mhz output so far not measurable with frequency counter .
ReplyDeleteIs the 10 Mhz at a very low level ? or do I need a Crow to take measurements , I need the 10 mhz for a frequency locking a transceiver
The output is 3.3 V square, as far as I remember, so it should be simple to measure. It’s been some time since I did this, but the setup I used in the Ublox program is near the end of this post. https://la3za.blogspot.com/2015/10/just-good-enough-10-mhz-reference.html
ReplyDeletePlease also be aware that this 10 MHz reference has lots of sideband noise, https://la3za.blogspot.com/2019/05/more-spurs-than-i-had-hoped-for.html
ReplyDeleteTherefore I have moved on to a GPS-corrected reference now, https://la3za.blogspot.com/2020/09/gps-corrected-10-mhz-reference.html