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

[david vanhorn]

Gavin:  It would probably help if you could measure resistance from the
antenna tip to connector shell, and from the connector center pin to the
shell as well as tip of antenna to center conductor.

The sales info really doesn't detail anything about the antenna, and we
might be looking at a resistance to ground, series coil, shunt coil, or
some other contraption inside the antenna.
Knowing typical measurements on a working antenna would help figure things
out.



On Wed, Jan 30, 2019 at 9:24 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
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-- 
K1FZY (WA4TPW) SK  9/29/37-4/13/15
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