Cliff, That sounds like a faulty ANT500. Please contact your reseller for a replacement. Send a private email to me and i...@greatscottgadgets.com if you run into any problems with that.
The two most common faults of ANT500 and ANT700 are a short between the center pin and shield ground or a break in continuity between the center pin and the antenna element. Both of these conditions can be tested with a continuity tester. The DC resistance between the center pin and the antenna element is unspecified, but I think it should be stable and low enough to cause a continuity tester to beep. Michael On Thu, Jan 31, 2019 at 09:45:58AM -0500, cliff palmer wrote: > > Jake, the reading between the tip of the antenna and the center pin varied > wildly - so much that I borrowed another multi-meter to confirm them. The > readings went from zero to 160+ and back. I did secure the antenna and the > multi-meter leads to make sure my hands weren't the cause of the variation. > It looks like the antenna is faulty. > Thanks for the hint on CQRX. > > I am using the Hackrf with the Ant500 as a starting place to learn enough > about SDR to tap RF data feeds from NOAA Buoys. These buoys measure water > temp, wind speed and direction, wave direction, height and frequency. The > buoy data will be fed into an FPGA/RISC board to calculate and display > marine navigation conditions, much like your local weather forecast > includes a wind speed and direction display. > There's no way that the Ant500 will be the right antenna for this. I got > it because I needed a starting place and a number of YouTube tutorials on > SDR used it with the Hackrf. Once I know more about what I am doing I'll > be pestering you all again for advice on antennas. > > Thanks again > Cliff > > On Wed, Jan 30, 2019 at 11:24 PM Gavin Jacobs <apriljunk...@hotmail.com> > wrote: > > > Cliff, > > I have a hackrf and an Ant500. With the antenna fully extended, you should > > measure a very low resistance between the tip of the antenna and the center > > pin of the connector. Mine was about 2 ohms. If you have 75 ohms, then > > there is a problem. Try again between the center pin and the elbow (where > > the extensions start) - it should be very low < 1 ohm. > > > > You should be able to use GQRX to receive an FM radio station, with almost > > any antenna. Most common rookie mistake is forgetting to turn up the IF > > gain. > > > > Tell us more about your setup and we can help you get started. > > > > Jake > > > > ------------------------------ > > *From:* HackRF-dev <hackrf-dev-boun...@greatscottgadgets.com> on behalf > > of cliff palmer <palmercl...@gmail.com> > > *Sent:* January 30, 2019 3:15 PM > > *To:* hackrf-dev@greatscottgadgets.com > > *Subject:* [Hackrf-dev] How to tell if antenna is faulty > > > > I have a Hackrf One with an Ant500 Antenna and I am having no luck with > > multiple tutorials found on YouTube, including the ones at Great Scott > > Gadgets. I measured the resistance on the (disconnected but fully > > extended) Ant500 Antenna using a multimeter (one lead on the metal part of > > the antenna and the other on the male lead in the connector. The > > multi-meter measured up to 75 Ohm resistance. > > I'm really new to SDR and so I don't know if resistance should concern me, > > but it seems like an antenna should not have resistance. > > I would appreciate some advice about how to determine if this is really a > > problem (and the antenna is faulty) or if I am making a typical new-to-SDR > > mistake. > > Thanks > > _______________________________________________ > > HackRF-dev mailing list > > HackRF-dev@greatscottgadgets.com > > https://pairlist9.pair.net/mailman/listinfo/hackrf-dev > > > _______________________________________________ > HackRF-dev mailing list > HackRF-dev@greatscottgadgets.com > https://pairlist9.pair.net/mailman/listinfo/hackrf-dev _______________________________________________ HackRF-dev mailing list HackRF-dev@greatscottgadgets.com https://pairlist9.pair.net/mailman/listinfo/hackrf-dev
