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Old 03-19-2013, 01:31 AM   #1
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Default Lokata 7 RDF

It's amazing what you find. I have just purchased a working Lokata 7 radio direction finder and hand held compass. I whacked some batteries into it and the little screen on the front displays digital information, from what I imagine are marine beacons which, since the advent of GPS are probably no longer used.

I will use it as a hand bearing compass but wonder if anyone has one of these devices or if anyone has a manual that I can aquire.

Cheers
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Old 03-20-2013, 10:35 AM   #2
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Default Blast from the past

Not that I've looked lately, but I think I've still got mine on 'Athene of Lymington' (can't look right now 'cos she's sitting on the concrete in Preveza, Greece). Brings back memories of navigating 'on the null' rather like the 'Neckerbein' used by the Nazi bombers in WWII. Not that I always hit the target, of course, as my crew can attest.

The marine stations are long gone, but as far as I know the aero beacons used for aircraft navigation are still broadcasting. You just need to know the frequency, tune the Lokata 7 to it, then swing from side to side and wait for the null, which gives you the bearing (I assume you have the plug-in headphones as well). You obviously need at least three bearings to give a reasonably accurate fix, which may be the problem these days.

Anyway, if that doesn't work you can always go back to the cross staff ...
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Old 03-20-2013, 06:07 PM
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Old 03-24-2013, 07:48 PM   #3
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Default

Auzzee, As a retired airline pilot, I can inform you that most of the aero NDB's (non directional beacons) are being decommissioned as a cost saving measure, since they are no longer necessary for navigation. I would suggest trying to use commercial AM broadcast stations as they are much more powerful and still available. Just an aside, I have never used an RDF on a sailboat, but understand that they have to be calibrated for the rigging effect. Any advice there? Cheers, gts1544
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Old 01-01-2017, 10:42 AM   #4
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Default

Quote:
Originally Posted by Auzzee View Post
It's amazing what you find. I have just purchased a working Lokata 7 radio direction finder and hand held compass. I whacked some batteries into it and the little screen on the front displays digital information, from what I imagine are marine beacons which, since the advent of GPS are probably no longer used.

I will use it as a hand bearing compass but wonder if anyone has one of these devices or if anyone has a manual that I can aquire.

Cheers
Hello Auzzee. Well, tour post is 2005 and you may be with Davie Jones. In the event you still breathe good old carbonmonoxide I wish to say this. I picked up a Lokata 7 from a friend and I have no idea how it works. Batteries in it gives digital readings about beacons etc. Were you able to get a manual. Who made these things, sure we can get a manual somewhere.
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Old 01-01-2017, 05:27 PM   #5
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Default Lakota 7 RDF

Gents, I don't know anything about said unit, but as a retired airline pilot of nearly 40 years, I do know something about the use of radio direction finding.

First, you need to tune to the frequency of a radio station (LF or AM) with a known charted location. As stated in an earlier post, which I just noticed, most of the aero NDB stations have been decommissioned so AM is probably your best choice. I have navigated many a mile with my ADF tuned to a powerful commercial AM station.

Second, you rotate the antenna (or the radio, if the antenna is fixed) to obtain the NULL (weakest signal) as that is much more precise than the strongest signal. There will be two null positions 180 degrees apart so it helps to know the rough direction to the selected station. The null occurs when the antenna is perpendicular to the line of sight to the station.

Third, resolve that direction into a true / magnetic / relative bearing (depending on your use) to the station. Be aware that a ship's magnetic influence (metal / sailboat rigging / etc.) can affect the accuracy of the bearing so it is helpful to have your unit compensated for the location where it is going to be used. Hope this helps!
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