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QLG2 with QMX+ Poor Sensitivity

Mike Krieger All Messages By This Member #128091 Two years ago I built the clock kit with the QLG1. The clock will sinc, up any place in the house including the basement. This year I built the QMX+ with the QLG2. The clock will not sync. up unless I am outdoors or have the antenna next to a window. If I move the antenna away from the window it will not sync.. I am wondering what others are experiencing?? Is this normal operation or do I have a problem?? Mike Krieger .?
Tony Scaminaci All Messages By This Member #128092 Hi Mike, I get results similar to yours between the QLG1 and QLG2. The QLG1’s patch antenna is very good. The amplified antenna used on the QLG2 needs good exposure for reliable results. Tony AC9QY toggle quoted message Show quoted text On Mon, Aug 19, 2024 at 9:15?PM Mike Krieger via <wa8uoc=[email protected]> wrote: Two years ago I built the clock kit with the QLG1. The clock will sinc, up any place in the house including the basement. This year I built the QMX+ with the QLG2. The clock will not sync. up unless I am outdoors or have the antenna next to a window. If I move the antenna away from the window it will not sync.. I am wondering what others are experiencing?? Is this normal operation or do I have a problem?? Mike Krieger .?
Greg McCain All Messages By This Member #128093 Quick question? Did you actually use a QLG2 or the optional QLG3? I also found that the antenna in the QLG3 seems to be less sensitive in that it takes longer to sync up fully with the supplied patch antenna? than one that came with a several years old Leo Bodnar GPS Reference Clock that I have in the basement shack with the antenna just sitting on the middle ledge of a double hung window. Both antennas placed in the same position for my troubleshooting testing.? Though ....? I did find that I had initially not fully screwed down? the GLC3 antenna to the SMA connector on the QMX+. Sync time improved after making sure of full connection. But it still takes sometimes a few minutes to sync up fully. Not a show stopper for me. I? do use a QLG2 with my QMX high band that I bought and built this past February. It is a blazing fast performer! Its at my winter QTH but will sync up typically in under a minute even though it's right next to a very large aluminium clamshell awning. 73 GREG toggle quoted message Show quoted text On Mon, Aug 19, 2024 at 10:15 PM, Mike Krieger <wa8uoc@...> wrote: Two years ago I built the clock kit with the QLG1. The clock will sinc, up any place in the house including the basement. This year I built the QMX+ with the QLG2. The clock will not sync. up unless I am outdoors or have the antenna next to a window. If I move the antenna away from the window it will not sync.. I am wondering what others are experiencing?? Is this normal operation or do I have a problem?? Mike Krieger .?
Daniel Walter All Messages By This Member #128112 Mike, Tony, I have had very similar experience with my QLG1 (x2) and QLG2 (x2). The QLG1's patch antenna definitely seems better. However, I have not tried it with the QLG2's antenna on a significantly large piece of steel. That may make a difference.? -- 73, Dan? NM3A
Mike Krieger All Messages By This Member #128116 Thanks for the input on your KLG2. Mike Krieger toggle quoted message Show quoted text On Mon, Aug 19, 2024 at 10:28?PM Tony Scaminaci via <tonyscam=[email protected]> wrote: Hi Mike, I get results similar to yours between the QLG1 and QLG2. The QLG1’s patch antenna is very good. The amplified antenna used on the QLG2 needs good exposure for reliable results. Tony AC9QY On Mon, Aug 19, 2024 at 9:15?PM Mike Krieger via <wa8uoc=[email protected]> wrote: Two years ago I built the clock kit with the QLG1. The clock will sinc, up any place in the house including the basement. This year I built the QMX+ with the QLG2. The clock will not sync. up unless I am outdoors or have the antenna next to a window. If I move the antenna away from the window it will not sync.. I am wondering what others are experiencing?? Is this normal operation or do I have a problem?? Mike Krieger .?
Tony Scaminaci All Messages By This Member #128130 Dan, Hans’s write up on the QLG1 indicates the large ground plane under the patch antenna contributes to its excellent sensitivity. I think you’re on the right track with trying a ground plane under the QLG2 amplified antenna. Let us know if this improves lock time and/or captures additional satellites. Tony AC9QY toggle quoted message Show quoted text On Tue, Aug 20, 2024 at 4:09?AM Daniel Walter via <nm3a=[email protected]> wrote: Mike, Tony, I have had very similar experience with my QLG1 (x2) and QLG2 (x2). The QLG1's patch antenna definitely seems better. However, I have not tried it with the QLG2's antenna on a significantly large piece of steel. That may make a difference.? -- 73, Dan? NM3A
Hans Summers All Messages By This Member #128131 Hi Tony I think that most probably a QLG2 has better sensitivity because of the LNA in the QLG2 active antenna patch. However that also means it has a lower IP3, so in some circumstances it may have lower immunity to noise and other interference. I personally have found QLG2 and 3 to have a higher SENSITIVITY than QLG1. But that doesn't mean in all cases it will have a higher performance (faster lock, more satellites in fix, etc). Because if it is in an RF-noisy environment at whatever frequencies matter to it, then it could suffer more intermodulation distortion problems.? 73 Hans G0UPL toggle quoted message Show quoted text On Tue, Aug 20, 2024 at 7:04?PM Tony Scaminaci via <tonyscam=[email protected]> wrote: Dan, Hans’s write up on the QLG1 indicates the large ground plane under the patch antenna contributes to its excellent sensitivity. I think you’re on the right track with trying a ground plane under the QLG2 amplified antenna. Let us know if this improves lock time and/or captures additional satellites. Tony AC9QY On Tue, Aug 20, 2024 at 4:09?AM Daniel Walter via <nm3a=[email protected]> wrote: Mike, Tony, I have had very similar experience with my QLG1 (x2) and QLG2 (x2). The QLG1's patch antenna definitely seems better. However, I have not tried it with the QLG2's antenna on a significantly large piece of steel. That may make a difference.? -- 73, Dan? NM3A
Tony Scaminaci All Messages By This Member #128138 Hi Hans, I agree about RF noise impacting the active antenna. I’ve noticed this with my PC radiating DC to blue light. Turning off the monstrosity definitely improves things. I’ve had both the QLG1 and QLG2 running near each other on my desk with the active antenna close by and the QLG1 always gets a fix faster. Moving the QLG2 active antenna to a window helps a bit but the biggest improvement comes from turning off the PC. Tony? toggle quoted message Show quoted text On Tue, Aug 20, 2024 at 11:12?AM Hans Summers via <hans.summers=[email protected]> wrote: Hi Tony I think that most probably a QLG2 has better sensitivity because of the LNA in the QLG2 active antenna patch. However that also means it has a lower IP3, so in some circumstances it may have lower immunity to noise and other interference. I personally have found QLG2 and 3 to have a higher SENSITIVITY than QLG1. But that doesn't mean in all cases it will have a higher performance (faster lock, more satellites in fix, etc). Because if it is in an RF-noisy environment at whatever frequencies matter to it, then it could suffer more intermodulation distortion problems.? 73 Hans G0UPL On Tue, Aug 20, 2024 at 7:04?PM Tony Scaminaci via <tonyscam=[email protected]> wrote: Dan, Hans’s write up on the QLG1 indicates the large ground plane under the patch antenna contributes to its excellent sensitivity. I think you’re on the right track with trying a ground plane under the QLG2 amplified antenna. Let us know if this improves lock time and/or captures additional satellites. Tony AC9QY On Tue, Aug 20, 2024 at 4:09?AM Daniel Walter via <nm3a=[email protected]> wrote: Mike, Tony, I have had very similar experience with my QLG1 (x2) and QLG2 (x2). The QLG1's patch antenna definitely seems better. However, I have not tried it with the QLG2's antenna on a significantly large piece of steel. That may make a difference.? -- 73, Dan? NM3A
Chris Herd All Messages By This Member #128152 ? ? Hi ? Be cautious about GPS near high speed USB they both operate around 1.5GHz. ? ?
John Laidler All Messages By This Member #128171 It is quite normal for a GPS not to work if it can't see enough sky. It won't receive a signal through walls or a roof unless they are extremely thin or made of something like wood. ? If you want to operate away from the window you will need to extend the cable between the antenna and the radio.?
Mike Krieger All Messages By This Member #128181 QLG1 seems to be far superior to QLG2. It works anyplace in my house including the basement. I will add a larger ground plane to myQLG2. Mike Krieger toggle quoted message Show quoted text On Wed, Aug 21, 2024 at 2:41?AM John Laidler via <rjohnlaidler=[email protected]> wrote: It is quite normal for a GPS not to work if it can't see enough sky. It won't receive a signal through walls or a roof unless they are extremely thin or made of something like wood. ? If you want to operate away from the window you will need to extend the cable between the antenna and the radio.?

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