All, The GPS receivers and antennas arrived on Friday. For the people who already paid I will send out the orders on Monday. If you placed an order and have not sent in your payment, now would be a good time to do it. Here's some info on the GPS timing system; If you ordered the receiver without the interface board you will need to power the receiver with 5 VDC. The current requirements is around 200 ma with the antenna attached. Since the serial input/output is not standard RS232 voltage levels you will need to use a chip like the MAX232 RS232 driver / receiver IC. If you are going to use it with SDR you will also need to wire up the 1 PPS signal. You can either place it on pin 1 of the 9 pin RS232 connector or run a digital line to the 37 pin IO connector. If you ordered the unit with the interface all you will needed to do is supply a DC voltage in the range of ~7 to 40 volts. The current requirements with the antenna attached is ~185 ma at 8 VDC, 125 ma at 12 VDC and 100 ma at 15 VDC. The power should be applied to the +pwr and -pwr solder holes. Do not use the +- Bat inputs. Since the GPS receivers already have a battery installed in them, these inputs should be left open. To connect the unit to your PC use a standard serial cable. You do not need a null modem adapter or cross-over cable. In SDR set the "Set Time Using Comm Port" menu item to the port number and set "GPS Mode" to Yes. After restarting SDR it may take a while for the unit to first lock up to the GPS time. I bought a few extra receivers and antennas so if you would like one send me an email message. -Larry Cochrane Redwood City, PSN __________________________________________________________ Public Seismic Network Mailing List (PSN-L)
Larry Cochrane <cochrane@..............>