Re: [time-nuts] Low-cost GPS distribution using DVB-T parts?
Hi David: It turns out there there are a number of different voltage standards. Anywhere between 3.3 Volts for the DAGR to 10 Volts (and higher) for many surveying GPS receivers like the Ashtech Z12 http://www.prc68.com/I/AshtechZ12.shtml I've tested a number of them with some data at: http://www.prc68.com/I/DAGR.shtml#Ant The Motorola hockey puck was NOT designed for much more than 5 Volts, it's an anomaly, most antennas work over a wide range of DC voltages. Have Fun, Brooke Clarke Thanks for those pointers, Brooke - it looks like you've been having fun as well! Cheers, David -- SatSignal software - quality software written to your requirements Web: http://www.satsignal.eu Email: david-tay...@blueyonder.co.uk ___ 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.
Re: [time-nuts] Low-cost GPS distribution using DVB-T parts?
Indeed I used a cabletv/tv line amp for several years and splitters very effectively. However my last project used a preamplified antenna driving a minicircuits amp to a 8 way fairly good grade satellite splitter. The 8 way split is as I recall 19 db of loss. The mar circuit has 24-26 DB gain. Seems I always need just one more antenna feed. Plus the splitter has built in DC blocking. Though some gps recvrs need a antenna dc load to be happy. Regards Paul WB8TSL On Sun, Nov 6, 2011 at 11:28 AM, David J Taylor david-tay...@blueyonder.co.uk wrote: My thanks to Nigel, Azelio, and Chuck for confirming the feasibility of this. At least I haven't spent too much time re-inventing the wheel. I now have some bits on order, including yes more adapters for those wretched F-connectors! Cheers, David -- SatSignal software - quality software written to your requirements Web: http://www.satsignal.eu Email: david-tay...@blueyonder.co.uk __**_ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/** mailman/listinfo/time-nutshttps://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ 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.
Re: [time-nuts] Low-cost GPS distribution using DVB-T parts?
Yes, as some GPSes need a DC path to recognize a valid antenna I modify the cheap satellite/TV splitters with a 270ohm (also 220, 180, 150 will do) resistor between output F connector center and the GND. On 11/7/11, paul swed paulsw...@gmail.com wrote: Indeed I used a cabletv/tv line amp for several years and splitters very effectively. However my last project used a preamplified antenna driving a minicircuits amp to a 8 way fairly good grade satellite splitter. The 8 way split is as I recall 19 db of loss. The mar circuit has 24-26 DB gain. Seems I always need just one more antenna feed. Plus the splitter has built in DC blocking. Though some gps recvrs need a antenna dc load to be happy. Regards Paul WB8TSL On Sun, Nov 6, 2011 at 11:28 AM, David J Taylor david-tay...@blueyonder.co.uk wrote: My thanks to Nigel, Azelio, and Chuck for confirming the feasibility of this. At least I haven't spent too much time re-inventing the wheel. I now have some bits on order, including yes more adapters for those wretched F-connectors! Cheers, David -- SatSignal software - quality software written to your requirements Web: http://www.satsignal.eu Email: david-tay...@blueyonder.co.uk __**_ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/** mailman/listinfo/time-nutshttps://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ 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. ___ 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.
[time-nuts] Low-cost GPS distribution using DVB-T parts?
Azelio Boriani- Yes, as some GPSes need a DC path to recognize a valid antenna I modify the cheap satellite/TV splitters with a 270ohm (also 220, 180, 150 will do) resistor between output F connector center and the GND. I 've done the same. I use a Mini-Circuits ZAPD GPS two output amp and feed each outputs to a 4-way 2.4Ghz TV splitter with F connectors (just like item number 250865005544 on the popular auction site, $14 for 2 including shipping costs) with one power pass output and 3 blocking outputs. This allows me to run a number of GPS units I'm testing with the amp gain-splitter loss not swamping the receiver. Another advantage is that the Thunderbolts use a type F connector and I can use ready made low loss TV cables to connect everything. I've used up to a 330 ohm resistor to fool the GPS into thinking there is a direct connection to the antenna on the 3 blocking outputs, or just live with the open antenna message. I just have to make sure I have at least one of the GPS receivers connected to one of the power pass outputs so the amp is powered. -Arthur ___ 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.
Re: [time-nuts] Low-cost GPS distribution using DVB-T parts?
Hi David: Yes, see: http://www.prc68.com/I/4GPS.shtml Have Fun, Brooke Clarke http://www.PRC68.com http://www.End2PartyGovernment.com/ David J Taylor wrote: Folks, I wonder whether anyone has tried GPS RF signal distribution using low-cost TV parts? For example, this amplifier: http://www.amazon.co.uk/gp/product/B001AI7OOQ is rated up to 2.3 GHz and could be driven from the +5 V available on the antenna socket of some units. Used after a puck antenna, its noise factor would not be critical, nor would the 50-ohm/75-ohm impedance mismatch. You could then add a 2-way or 4-way satellite TV splitter to feed multiple GPS units (taking care of the DC paths and various connector formats, of course). Just a thought Cheers, David ___ 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.
Re: [time-nuts] Low-cost GPS distribution using DVB-T parts?
Hi David: Yes, see: http://www.prc68.com/I/4GPS.shtml Have Fun, Brooke Clarke Yes, someone had already pointed out your site. Brilliant, and encouraging for the rest of us. I'm sticking with 5V only, by the way, if I can. I have the antenna in the loft now, line-amp awaited. Thanks, David -- SatSignal software - quality software written to your requirements Web: http://www.satsignal.eu Email: david-tay...@blueyonder.co.uk ___ 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.
Re: [time-nuts] Low-cost GPS distribution using DVB-T parts?
Hi David: It turns out there there are a number of different voltage standards. Anywhere between 3.3 Volts for the DAGR to 10 Volts (and higher) for many surveying GPS receivers like the Ashtech Z12 http://www.prc68.com/I/AshtechZ12.shtml I've tested a number of them with some data at: http://www.prc68.com/I/DAGR.shtml#Ant The Motorola hockey puck was NOT designed for much more than 5 Volts, it's an anomaly, most antennas work over a wide range of DC voltages. Have Fun, Brooke Clarke http://www.PRC68.com http://www.End2PartyGovernment.com/ David J Taylor wrote: Hi David: Yes, see: http://www.prc68.com/I/4GPS.shtml Have Fun, Brooke Clarke Yes, someone had already pointed out your site. Brilliant, and encouraging for the rest of us. I'm sticking with 5V only, by the way, if I can. I have the antenna in the loft now, line-amp awaited. Thanks, David ___ 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.
[time-nuts] Low-cost GPS distribution using DVB-T parts?
Folks, I wonder whether anyone has tried GPS RF signal distribution using low-cost TV parts? For example, this amplifier: http://www.amazon.co.uk/gp/product/B001AI7OOQ is rated up to 2.3 GHz and could be driven from the +5 V available on the antenna socket of some units. Used after a puck antenna, its noise factor would not be critical, nor would the 50-ohm/75-ohm impedance mismatch. You could then add a 2-way or 4-way satellite TV splitter to feed multiple GPS units (taking care of the DC paths and various connector formats, of course). Just a thought Cheers, David -- SatSignal software - quality software written to your requirements Web: http://www.satsignal.eu Email: david-tay...@blueyonder.co.uk ___ 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.
Re: [time-nuts] Low-cost GPS distribution using DVB-T parts?
Worked for me when I was driving two Thunderbolts from the same antenna using a splitter. Operation without the amp in the line was marginal. With the amp in the line things were fine. The amp is a Perfect Vision in-line map 950-2400 MHz 20db sold for use with satellite dishes. -- Chuck Forsberg WA7KGX N2469R c...@omen.com www.omen.com Developer of Industrial ZMODEM(Tm) for Embedded Applications Omen Technology Inc The High Reliability Software 10255 NW Old Cornelius Pass Portland OR 97231 503-614-0430 ___ 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.
Re: [time-nuts] Low-cost GPS distribution using DVB-T parts?
In my company we use home satellite/TV splitters to distribute the GPS antenna over tens of GPSDO units. Usually we split multiple times one single antenna without much problems. Yes, at times the satellite count is low but this is considered a useful test. On Sun, Nov 6, 2011 at 11:54 AM, Chuck Forsberg WA7KGX N2469R c...@omen.comwrote: Worked for me when I was driving two Thunderbolts from the same antenna using a splitter. Operation without the amp in the line was marginal. With the amp in the line things were fine. The amp is a Perfect Vision in-line map 950-2400 MHz 20db sold for use with satellite dishes. -- Chuck Forsberg WA7KGX N2469R c...@omen.com www.omen.com Developer of Industrial ZMODEM(Tm) for Embedded Applications Omen Technology Inc The High Reliability Software 10255 NW Old Cornelius Pass Portland OR 97231 503-614-0430 ___ 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. ___ 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.
Re: [time-nuts] Low-cost GPS distribution using DVB-T parts?
My thanks to Nigel, Azelio, and Chuck for confirming the feasibility of this. At least I haven't spent too much time re-inventing the wheel. I now have some bits on order, including yes more adapters for those wretched F-connectors! Cheers, David -- SatSignal software - quality software written to your requirements Web: http://www.satsignal.eu Email: david-tay...@blueyonder.co.uk ___ 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.
