Today's Message Index:
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1. 12:23 PM - Re: Re: ELT antenna (Steve Stearns)
2. 04:12 PM - ADSB Antenna (erich weaver)
3. 04:25 PM - Re: ADSB Antenna (don van santen)
Message 1
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Greetings All,
If anyone is interested in a 121.5/406 MHz (ARTEX ELT PORTABLE ANTENNA
110-775 - search on aircraft spruce), I have one I'm not going to use. I
was going to ebay it but I'll take a reasonable offer.
I also have several dual band monopoles I will not be using (ARTEX
A3-06-2892-1 Black TSO'd for, and delivered with the ARTEX ELT 345, and two
equivalent, but white, RAMI AV-200s) that are available to interested
parties.
I got these while experimenting with different approaches to the dual-band
antenna problem when I upgraded my ELT in my Longeze. Since it's a plastic
airplane, I have more options than others will. I decided (regardless of
the regulations issue) to mount a custom dual band dipole on the back of
the pilots seat. The frequency spacing made it so that I could not use the
usual dual band loading approaches of which I was aware and I wasn't able
to come up with a trap and loaded approach with which I had confidence.
However, the frequency spacing did allow me to come up with a two frequency
fan dipole with one pair of elements a center-loaded shortened dipole for
121.5 and the second dipole full length for 406 MHz. Element lengths were
adjusted to accommodate the dielectric properties of the nearby fiberglass
seat back. Also, since I'm not using a balun, the cable routing from the
center point is carefully laid on the virtual ground plane for a foot or
two. The result fits, it's located such that if the crash destroys it, I
won't be in a hurry for a rescue anyway, has good VSWR on both frequencies
and the ELT's self test is happy with it. Sadly, there was no combination
of the TSO'd antennas I could come up with that met these same criteria.
Best regards,
Steve Stearns
Longeze N45FC
Boulder/Longmont CO
Message 2
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Greetings
My uAvionix Echo ADSB unit came with a single transmit/receive pole style antenna.
It receives on both 978 and 1080 MHz while transmitting on 978 MHz. I would
like to replace it with a blade style antenna to be a bit more robust. Looking
on the Delta Pop antenna website, I see an ADSB blade antenna for 978 MHz.
Will that be sufficient to receive on 1080 MHz as well?
Thanks
Erich
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=482524#482524
Message 3
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Subject: | Re: ADSB Antenna |
The Delta Pop antenna works fine. I use two, one for the transponder/ADSB
out and one for the ADSB dual band in. Have used them for 2 tears with two
different systems and they have been flauless.
On Aug 18, 2018 16:16, "erich weaver" <erich.weaver@aecom.com> wrote:
erich.weaver@aecom.com>
Greetings
My uAvionix Echo ADSB unit came with a single transmit/receive pole style
antenna. It receives on both 978 and 1080 MHz while transmitting on 978
MHz. I would like to replace it with a blade style antenna to be a bit more
robust. Looking on the Delta Pop antenna website, I see an ADSB blade
antenna for 978 MHz. Will that be sufficient to receive on 1080 MHz as
well?
Thanks
Erich
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=482524#482524
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