Thanks Michael, I've contacted the reseller and will let you know if there are problems with getting a replacement. Cliff
On Thu, Jan 31, 2019 at 6:22 PM Michael Ossmann <[email protected]> wrote: > Cliff, > > That sounds like a faulty ANT500. Please contact your reseller for a > replacement. Send a private email to me and [email protected] > 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 <[email protected]> > > 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 <[email protected]> on > behalf > > > of cliff palmer <[email protected]> > > > *Sent:* January 30, 2019 3:15 PM > > > *To:* [email protected] > > > *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 > > > [email protected] > > > https://pairlist9.pair.net/mailman/listinfo/hackrf-dev > > > > > > _______________________________________________ > > HackRF-dev mailing list > > [email protected] > > https://pairlist9.pair.net/mailman/listinfo/hackrf-dev > >
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