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Thread: What DF is DF?

  1. #1
    The new bee in town JenM's Avatar
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    What DF is DF?

    I can't figure out what it stands for. Thanks.
    This new bee flies in SCV.

  2. #2
    Now with racer-boy font! Moonshot's Avatar
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    Can you use it in a sentence?

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    Humvee of bikes =Worksman Nightshade's Avatar
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    lame.....real lame......

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    Senior Member
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    Divorced Female?

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    Cycling Anarchist Trsnrtr's Avatar
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    Quote Originally Posted by JenM
    I can't figure out what it stands for. Thanks.
    It stands for Diamond Frame and is shorthand that recumbentists use for wedgies, oops, I mean upright bikes.
    Dennis T

  6. #6
    The new bee in town JenM's Avatar
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    Quote Originally Posted by Tightwad
    lame.....real lame......
    What? That I asked an honest question?
    This new bee flies in SCV.

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    Diamond Frame... heh. I didn't know either!

    I"m used to DF = Direction Find, as in radio transmitting, finding a transmitter.

  8. #8
    DEADBEEF khuon's Avatar
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    Quote Originally Posted by lilHinault
    Diamond Frame... heh. I didn't know either!

    I"m used to DF = Direction Find, as in radio transmitting, finding a transmitter.
    As in an ADF...

    I took DF to mean "don't fragment".

    Okay, so I actually knew that DF meant diamond frame but I just like being a smarta$$.
    1999 K2 OzM 2001 Aegis Aro Svelte OCP Club Member
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    ADF = automatic DF, like your basic doppler set does to find that @#$%@#$% fox....

  10. #10
    Conservative Hippie
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    DF-Diamond Frame. Well, that's the one thing I learned new for today. Met my quota.

    I'm vaguely familiar with RDF. We used to use it for navigation when we went off-shore, fishing. This was back before LORAN A. Does that date me?

  11. #11
    DEADBEEF khuon's Avatar
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    Quote Originally Posted by CommuterRun
    I'm vaguely familiar with RDF. We used to use it for navigation when we went off-shore, fishing. This was back before LORAN A. Does that date me?
    Radio Direction Finder? In aviation we used ADFs (automatic direction finders) which would basically lock onto an NDB (non-directional beacon)... essentially any omni-directional AM transmitter including radio station towers. The NDBs used were fixed and marked on maps. A lot of times one would use the approach marker beacons... usually the LOM (locator outer marker). The ADF was a very complicated and expensive piece of hardware mainly because of the mechanics and installation. It was big and heavy too. The nice thing about ADF/NDBs is that the technology and principles of operation are fairly robust. However, the skills required to execute an NDB approach were fairly tough to master and one of the most dreaded things during IFR training... especially if one had to do it with a non-slaved CDI/HSI (course deviation indicator/horizontal situation indicator) because you have to cross reference across two different instrument displays to determine your radial position. The ADF is used along with a DME (distance measuring equipment) to determine your location from the beacon. Another benefit of ADF/DME equipment is for use in SAR operations to locate ELTs (emergency locator transmitters).
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  12. #12
    Errand Boy for my girls sukispop's Avatar
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    Quote Originally Posted by Tightwad
    lame.....real lame......
    I'll tell you what "real lame" is--

    It's when a forums member can't find the common decency or courtesy to give a simple and friendly answer to a sincere and friendly question.


    The next time that you find a member's question lame...real lame....why don't you do us all a favor, and pass on posting any kind of reply, and keep your nastiness to yourself?

    ***Geoff***
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  13. #13
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    Quote Originally Posted by sukispop
    I'll tell you what "real lame" is--

    It's when a forums member can't find the common decency or courtesy to give a simple and friendly answer to a sincere and friendly question.


    The next time that you find a member's question lame...real lame....why don't you do us all a favor, and pass on posting any kind of reply, and keep your nastiness to yourself?

    Don't worry about him, that guy is an accredited forum troll. Press ignore.

  14. #14
    Errand Boy for my girls sukispop's Avatar
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    Quote Originally Posted by operator
    Don't worry about him, that guy is an accredited forum troll. Press ignore.
    Thanks for the info, operator!

    'Just more evidence that God must have had a migraine when he created trolls....

    ***Geoff***
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    Conservative Hippie
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    The RDF we had worked like the ADF you describe, Khuon, except everything was manual. The base of the unit had to be oriented to north, then rotate a knob to align the directional antennae with the signal you wanted to pick up, an indictator needle aligned with the antennae pointed out the direction to the signal on a compass rose printed on the base of the unit. Plot this azimuth on a chart then do it all again with a different signal. Where the two lines crossed was our location. Funny how cutting-edge stuff back then sounds pretty crude now, but remember, this was back when a computer took up an entire large room and a thing that was to be called a PC was still quite a few years away. Heck, there were even real Hippies still around back then.

    We kept using this unit through the LORAN A years and later switched to LORAN C. After loosing the boat to a hurricane many years ago, and later Grandpa to cancer, none of us fish offshore anymore. These days my Dad, brothers and I pretty much stick to inshore and freshwater and like everybody else, we use GPS.

    Don't know whatever happened to that old RDF unit. Wish I still had it.

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    ADF's been around a long time, the Japanese planes that bombed Pearl Harbor used radio station KGMB in Honolulu as a signal to DF coming in.......

    check out "radiosport" it's a modern, fun "sport" where you use a directional VHF antenna to DF and find a "fox" or hidden transmitter.

  17. #17
    The new bee in town JenM's Avatar
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    It's good to know not all DF riders have a stick up their _ _ _ _!
    This new bee flies in SCV.

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    DEADBEEF khuon's Avatar
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    Quote Originally Posted by lilHinault
    ADF's been around a long time, the Japanese planes that bombed Pearl Harbor used radio station KGMB in Honolulu as a signal to DF coming in.......
    You might be surprised to find that many things in aviation are actually quite old and "antiquated" technology. For instance, many light aircraft engines are basically a high-powered equivalents of lawn mower engines. Fuel injection? Electronic ignition? Not in those Cessna 172s flying out of PAO. We're talking good old carbs and magnetos. The advantage however is that if you have a total electrical system failure, the engine will continue to run.
    1999 K2 OzM 2001 Aegis Aro Svelte OCP Club Member
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  19. #19
    Hot in China azesty's Avatar
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    I have done underwater tracking of Leafy Seadragons. Radio, except for very long wavelengths, wont work in salt water, so we had to use sonic tags, and a manual directional microphone pointing technique. Not that old, but different.

    a

  20. #20
    DEADBEEF khuon's Avatar
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    Quote Originally Posted by azesty
    we had to use sonic tags, and a manual directional microphone pointing technique. Not that old, but different.
    Hydrophones have been around a long time too.
    1999 K2 OzM 2001 Aegis Aro Svelte OCP Club Member
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    Morse Code.

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    Bike Geek dm_fuel100's Avatar
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    Quote Originally Posted by Trsnrtr
    It stands for Diamond Frame and is shorthand that recumbentists use for wedgies, oops, I mean upright bikes.
    Diamond Frame? Huh, and all this time I thought they were my initials.
    dm_fuel100

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    Formerly Known as Newbie Juha's Avatar
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    Quote Originally Posted by CommuterRun
    Funny how cutting-edge stuff back then sounds pretty crude now, but remember, this was back when a computer took up an entire large room and a thing that was to be called a PC was still quite a few years away. Heck, there were even real Hippies still around back then.
    OK, I'll reluctantly buy the stuff about computers. But what are these Hippies you claim to have seen?

    --J
    To err is human. To moo is bovine.

    Who is this General Failure anyway, and why is he reading my drive?


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    No Rocket Surgeon eubi's Avatar
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    Quote Originally Posted by lilHinault
    Morse Code.
    If we're talking HAM lingo, Morse Code is "CW" (Continuous Wave).

    KG6NPA

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    You Know!? For Kids! jsharr's Avatar
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    Quote Originally Posted by Juha
    OK, I'll reluctantly buy the stuff about computers. But what are these Hippies you claim to have seen?

    --J
    I think the alledged "hippies" were just a hallucination brought on by some bad shrooms.
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    Quote Originally Posted by colorider View Post
    Phobias are for irrational fears. Fear of junk ripping badgers is perfectly rational. Those things are nasty.

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