---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Sat 08/18/18: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 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 _____________________________________ Time: 12:23:26 PM PST US From: Steve Stearns Subject: Re: AeroElectric-List: Re: ELT antenna 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 _____________________________________ Time: 04:12:05 PM PST US Subject: AeroElectric-List: ADSB Antenna From: "erich weaver" 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 _____________________________________ Time: 04:25:10 PM PST US From: don van santen Subject: Re: AeroElectric-List: 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" 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 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message aeroelectric-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/AeroElectric-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/aeroelectric-list Browse Digests http://www.matronics.com/digest/aeroelectric-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.