---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Fri 09/02/11: 6 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 11:07 AM - Two Radios, One Antenna (Robert L. Nuckolls, III) 2. 03:40 PM - Re: Two Radios, One Antenna (Thomas Barter) 3. 06:23 PM - Re: Two Radios, One Antenna (Jared Yates) 4. 08:51 PM - Re: Two Radios, One Antenna (Robert L. Nuckolls, III) 5. 09:06 PM - What's that beeping?? (Robert L. Nuckolls, III) 6. 09:41 PM - Whelen LED landing lights . . . (Robert L. Nuckolls, III) ________________________________ Message 1 _____________________________________ Time: 11:07:42 AM PST US From: "Robert L. Nuckolls, III" Subject: AeroElectric-List: Two Radios, One Antenna Here's a refined concept of the device I was talking about yesterday. The bill of materials for this gizmo would be on the order of $50. It would have to sell for $100 to $125 with mating connectors as a kit. Seems like a lot of fuss to avoid putting a second antenna on the airplane. Bob . . . ________________________________ Message 2 _____________________________________ Time: 03:40:50 PM PST US From: "Thomas Barter" Subject: RE: AeroElectric-List: Two Radios, One Antenna My goal is to be able to connect the hand held to the antenna if the main comm should be unusable. No duplexing needed. Would a device like the one shown be suitable for the task? Feed the antenna lead into the common, and connect the main radio to one output and the handheld jack to the other. I realize that these devices are rated for certain frequency bands, and one would need to be sure it was functional across the A/C comm range. Tom Barter -----Original Message----- Here's a refined concept of the device I was talking about yesterday. The bill of materials for this gizmo would be on the order of $50. It would have to sell for $100 to $125 with mating connectors as a kit. Seems like a lot of fuss to avoid putting a second antenna on the airplane. Bob . . . ________________________________ Message 3 _____________________________________ Time: 06:23:22 PM PST US Subject: Re: AeroElectric-List: Two Radios, One Antenna From: Jared Yates If your feed line is routed in a way that makes a switch like that accessibl e to you in the cockpit, can you just cut the feed line and crimp on two opp osite sex BNC connectors? If your handheld has a BNC style connection for t he antenna, just use the corresponding sex of connector on the antenna side o f the splice. Normal operations would be with the connectors joined. If the com goes TU, disconnect the joint and attach the antenna side directly to t he handheld. This would be a very crude switch but you are not going to be c ycling it frequently. On Sep 2, 2011, at 18:36, "Thomas Barter" w rote: > My goal is to be able to connect the hand held to the antenna if the main c omm should be unusable. No duplexing needed. Would a device like the one s hown be suitable for the task? Feed the antenna lead into the common, and c onnect the main radio to one output and the handheld jack to the other. I r ealize that these devices are rated for certain frequency bands, and one wou ld need to be sure it was functional across the A/C comm range. > > > > > > > > > > Tom Barter > > > > -----Original Message----- > > > > Here's a refined concept of the device I was talking > > about yesterday. The bill of materials for this gizmo > > would be on the order of $50. It would have to sell > > for $100 to $125 with mating connectors as a kit. > > > > Seems like a lot of fuss to avoid putting a second > > antenna on the airplane. > > > > > > Bob . . . > > > > ________________________________ Message 4 _____________________________________ Time: 08:51:20 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Two Radios, One Antenna At 08:20 PM 9/2/2011, you wrote: >If your feed line is routed in a way that makes a switch like that >accessible to you in the cockpit, can you just cut the feed line and >crimp on two opposite sex BNC connectors? If your handheld has a >BNC style connection for the antenna, just use the corresponding sex >of connector on the antenna side of the splice. Normal operations >would be with the connectors joined. If the com goes TU, disconnect >the joint and attach the antenna side directly to the handheld. This >would be a very crude switch but you are not going to be cycling it >frequently. I think this is the most elegant. We talked about this on the List some years ago. The idea was to route the comm antenna coax in such a way that a 'service loop' was joined at some point in the middle by a male-female cable pair of connectors. This loop might be just under the pilot's knees in front of the seat. If the main radio goes down, open this service loop and connect your HT into the coax. One builder made his service loop about 24" in circumference on the cable-male end that fed the antenna. He didn't need to carry an extension coax . . . he just opened the connectors, un-coiled the loop and connected it to his hand held. We also discussed using a pair of right-angle adapters on the hand-held antenna jack arranged so that the coax comes up the back side of the hand held, makes two 90-degree turns and drops onto the HT antenna jack. This is a very low cost, very reliable means for sharing duties on a single antenna. Bob . . . ________________________________ Message 5 _____________________________________ Time: 09:06:45 PM PST US From: "Robert L. Nuckolls, III" Subject: AeroElectric-List: What's that beeping?? See: http://aeroelectric.com/Pictures/Misc/Whats_that_beeping1.wmv Bob . . . ________________________________ Message 6 _____________________________________ Time: 09:41:54 PM PST US From: "Robert L. Nuckolls, III" Subject: AeroElectric-List: Whelen LED landing lights . . . Bill Shank sent me his Whelen PLED1L landing lights to get some performance data on them. The current draw on these puppies looks like this: Emacs! They don't even start to draw current until 8.8 volts and go into constant 1.2 amps constant current above 12.5 volts. The flashers we used to use for wig-wagging the incandescent lamps won't work with these devices. I'm developing a new recommendation. At 1.2 amps per lamp, the current draw is quite nominal. This product ought to open some new horizons for Rotax powered aircraft that have not been able to support the legacy landing light products. 2.4 amps for DUAL landing lights and 1.2 amps in wig-wag is quite doable with the Rotax 18A alternator. Watch this space . . . Bob . . . ------------------------------------------------------------------------------------- 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.