[Hackrf-dev] How to tell if antenna is faulty

[cliff palmer]

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 <mike at ossmann.com> wrote:

> Cliff,
>
> That sounds like a faulty ANT500.  Please contact your reseller for a
> replacement.  Send a private email to me and info at 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 <apriljunkbox at 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-bounces at greatscottgadgets.com> on
> behalf
> > > of cliff palmer <palmercliff at gmail.com>
> > > *Sent:* January 30, 2019 3:15 PM
> > > *To:* hackrf-dev at 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 at greatscottgadgets.com
> > > https://pairlist9.pair.net/mailman/listinfo/hackrf-dev
> > >
>
> > _______________________________________________
> > HackRF-dev mailing list
> > HackRF-dev at greatscottgadgets.com
> > https://pairlist9.pair.net/mailman/listinfo/hackrf-dev
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://pairlist9.pair.net/pipermail/hackrf-dev/attachments/20190131/305d6337/attachment.html>