---------------------------------------------------------- Avionics-List Digest Archive --- Total Messages Posted Mon 04/19/04: 4 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 09:35 AM - DVOR Schematic Needed (Hopperdhh@aol.com) 2. 06:18 PM - cell phone antenna (Troy Scott) 3. 07:09 PM - Re: cell phone antenna (Denny) 4. 10:00 PM - Re: cell phone antenna (Richard E. Tasker) ________________________________ Message 1 _____________________________________ Time: 09:35:00 AM PST US From: Hopperdhh@aol.com Subject: Avionics-List: DVOR Schematic Needed --> Avionics-List message posted by: Hopperdhh@aol.com Fellow Listers, I picked up an HT Instruments, Inc., Model DVOR 100 (I think it is) for $10 at Sun-n-Fun, just for hobby purposes. Does anyone happen to have a schematic or manual for this unit? From date codes on the IC's it looks like it was made in about 1975. Thanks, Dan Hopper K9WEK RV-7A (almost done) Probably would be done if I didn't get sidetracked by these little electronical projects! ________________________________ Message 2 _____________________________________ Time: 06:18:12 PM PST US From: "Troy Scott" Subject: Avionics-List: cell phone antenna --> Avionics-List message posted by: "Troy Scott" Gentlemen, Please excuse this intrusion. The following is not an "avionics" topic, but you guys are probably better equipped to help than any other group I know. A year or so ago, I thought I had come up with a marketable idea: a emergency cell phone antenna elevated by a small helium balloon. The idea would be to have it "just in case" I get stranded in the wilderness. I know this sounds a little crazy, but as I soon discovered, our military already uses this idea. So, it won't be a profitable new invention, but I still want to build one to use on camping trips. I'm thinking it would take only about 50 feet of additional elevation to make a substantial difference. I've been looking for a ready-made super light antenna that I can hang from the balloon. No luck. I'm thinking I would use 174 coax (or something even lighter if I can find it) as the combination tether/cable. Does anyone know of a suitable antenna? Or, does anyone know what the dimensions of a small dipole (no ground plane) would be? What about toroids? Any suggestions will be appreciated! Regards, Troy Scott ________________________________ Message 3 _____________________________________ Time: 07:09:44 PM PST US From: "Denny" Subject: RE: Avionics-List: cell phone antenna --> Avionics-List message posted by: "Denny" This is not by any means a professional answer but you would also have to factor in the signal loss in the coax, especially in 174. The higher the frequency the higher the loss per foot, I cant remember what cell phone frequency is right now but I know it is way up there so your loss would really be high. Sounds like a neat idea but not sure if you can pull it off. Might be better and a lot easier to get ham license and go 2 meters. Just 2 cents worth Denny -----Original Message----- emergency cell phone antenna elevated by a small helium balloon. The idea would be to have it "just in case" I get stranded in the wilderness. ________________________________ Message 4 _____________________________________ Time: 10:00:10 PM PST US From: "Richard E. Tasker" Subject: Re: Avionics-List: cell phone antenna --> Avionics-List message posted by: "Richard E. Tasker" Get a headset and make an extension for it then lift the whole phone. No coax loss, no designing an antenna. My $0.02. Dick Tasker Denny wrote: >--> Avionics-List message posted by: "Denny" > >This is not by any means a professional answer but you would also have to >factor in the signal loss in the coax, especially in 174. The higher the >frequency the higher the loss per foot, I cant remember what cell phone >frequency is right now but I know it is way up there so your loss would >really be high. Sounds like a neat idea but not sure if you can pull it off. >Might be better and a lot easier to get ham license and go 2 meters. >Just 2 cents worth >Denny > >-----Original Message----- > emergency cell phone antenna elevated by a small helium balloon. The idea >would be to have it "just in case" I get stranded in the wilderness. > > > >