[FARC] Local source for antenna connectors?

Wed Apr 29 11:02:36 EDT 2015

Brian, At that frequency you need to be very careful about matching impedances, antenna lengths, measurements, etc.  Reduced emmissions due to RF losses are very high and greatly reduce your communication range.
RG-59 is 75 Ohm coax and you're transceiver is probably a 50Ohm device.  I suggest you use RG-8X coax, and don't cheap out on it.  

Your wavelength is only about 9.8", so a half wave dipole is about 4.9".  You have to be very careful in when measuring and cutting.
UHF connectors are not made for that frequency and will greatly attenuate your signal.  I suggest you use either BNC or SMA.  "N" is of course the best, but they're too big for your application.
One of the easiest antennas to build is a Ground Plane.  I would use a "female chassis mount SMA".  Google it and you'll see what I mean.
If you go with a sleeve dipole, you will probably need to make a balun to isolate the RF from the coax.
Good luck with this project.  It should be more challenging than you think.
Regards,Lou Popowsky  KB3RNT

     On Wednesday, April 29, 2015 8:33 AM, Mike Barrett <mm.barrett at comcast.net> wrote:

 The nearest one I know is RF Connections. They are in Gaithersburg on 355. The are cable and connector central.

Sent from my Verizon Wireless 4G LTE DROID

Brian McEntire <brian.mcentire at gmail.com> wrote:

>Hi,
>I just got a fun dongle device that connects to a Raspberry Pi and can
>receive ADSB signals (1090 MHz.) It comes with a stock antenna and the
>system is working, now I want to experiment with a few home brew antennas.
>
>Is there a local store were I can buy a handful of various coax connectors?
>The dongle has an MCX female antenna port. I ordered a UHF SO239 PL259
>female to MCX male connector and a RF coaxial coax cable assembly BNC
>female to MCX when I ordered the dongle, so I'm looking for the appropriate
>matching/mating connectors for those to solder to my home brew antennas.
>
>I'm going to start with a Coaxial Collinear Antenna made from RG6 in my
>garage and a Collinear Wire Antenna from thick copper wire left over from
>some electrical work. May also try a wine cork dipole or a ladder line
>based J-Pole if I can find a short section of cheap TV ladder line.
>
>Guessing the Radio Shack at 7th street no longer stocks these connectors
>but would be happy to hear if they do or there's a good local parts store.
>
>Brian / KB3TCC
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