Today's Message Index:
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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
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| Subject: | 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
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| Subject: | cell phone antenna |
--> Avionics-List message posted by: "Troy Scott" <tscott1217@bellsouth.net>
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
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| Subject: | cell phone antenna |
--> Avionics-List message posted by: "Denny" <dennymortensen@cableone.net>
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
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| Subject: | Re: cell phone antenna |
--> Avionics-List message posted by: "Richard E. Tasker" <retasker@optonline.net>
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" <dennymortensen@cableone.net>
>
>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.
>
>
>
>
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