Can I use an different GPS antenna with the GPSDO module?

Tim - W4TME

Yes, you can. The GPS antenna supplied with the GPSDO module is a standard medium gain (26 dB) active GPS antenna. Most GPS antennas require 3.3 to 5 volts of DC power on the coax to power the antenna preamp and the FLEX-6000 GPSDO provide this voltage. Then GPS antenna connector on the FLEX-6000 is an SMA type connector. You can extend the length of the supplied RG174 coax in order to reach a place for the installation of the GPS antenna where it can receive the satellite signals.

NM1W

I got the Tram 1655 8' Marine GPS Antenna, from Walmart for $24.20; Stuck it outside, no issues getting a lock now.. (Got the suggestion from Jim K4JAF on the reflector)

Tim - W4TME

Here is another GPS antenna that has been reported to work well and has been used in high (1 KW) RF environments (tnx to Jim K5HY for the info) http://www.diltronic.com/wordpress/wp-content/uploads/2010101GPS-TMG-26N.pdf

Tim - W4TME

And another one... (tnx to Mel K0PFX for the info) The Motorola ANTA1 (GCNAC1232A. No RFI issues from a KW+ running right above it. ..and the price is right from TAPR. http://tapr.org/gps_ant1a.html

Jim K4JAF

The Tram 1655 from Walmart works well, I think it is rated at 30 db. You do need a BNC to SMA adapter to connect to the radio. I think it was $24 delivered to my local walmart. I haven't put it outside yet as get a quick lock with it sitting inside the house on a shelf next to the radio. 73s Jim K4JAF

Asher - K0AU

I am using this GPS antenna: https://www.fairradio.com/catalog.php?mode=viewitem&item=8953 through 100 feet of LMR400 and a DC-passing surge suppressor. It's mounted 10 feet above the ground with a 1/3 blocked sky to the north. Consistently locks on 10 to 12 satellites. 1.5 KW running through a different coax in the same conduit and to an HF antenna 40+ feet above the GPS antenna.

Keith - AE5XN

I recently bought this GPS antenna from Amazon, works very well with fast GPS lock times, and sees 10+ satellites with a very narrow view to the sky between two houses. I have it outside on top of one of my A/C units. It has a magnet on the bottom to stick to any ferrous surface, has 26dB gain, and is meant for automotive applications, so it's weatherproof. Can't beat the price, either! http://www.amazon.com/GlobalSat-AT-65SMA-GPS-Antenna/dp/B005RUPU6W/ref=sr_1_1?ie=UTF8&qid=1380901610&sr=8-1&keywords=GlobalSat+AT-65SMA+GPS+Antenna Keith - AE5XN