[TowerTalk] antenna; NDBs

[K8RI on Tower talk]

>I just recently dismounted and moved a NDB from its old place on the
> airfield some km out to a new location on a hill.
> The airfield is a military helicopter base and they just got a new type 
> with
> a difference approach pattern.
> The NDB antenna is a 24m high self supporting steel tower sitting on base

Here they look like a dipole strung between two wood poles about 20 feet 
high.

> insulators at the 3m level and is driven by a transmitter using a QB/300 =
> 4-125A in the final with about 120W.

I doubt these run much more than 5 or 10 watts as they are only audible for 
30 to 40 miles at best.
Frequency for Gladwin is 209 KHz. Length of the antenna appears to be about 
the same as a 40 meter dipole, but from the air that can be a bit 
misleading.

> The mains for the tower lighting is decoupled from the tower by an Austin
> Ring transformer
>
They just put a red light on top of each pole. No coupling systems are 
needed.

Roger Halstead (K8RI and ARRL 40 year Life Member)
N833R - World's oldest Debonair CD-2
www.rogerhalstead.com


> 73
> Peter, DF3KV
>
> -----Original Message-----
> From: towertalk-bounces at contesting.com
> [mailto:towertalk-bounces at contesting.com] On Behalf Of K8RI on Tower talk
> Sent: Donnerstag, 22. Juni 2006 19:38
> To: towertalk at contesting.com
> Subject: Re: [TowerTalk] antenna; NDBs
>
>
>
>
>> Guys:
>>
>> A Non Directional Beacon Wesite/Index:
>>
>>
> http://www.dxtuners.com/servlet/IBMainServlet/?ib_page=117&parent_id=36&iw_l
> anguage=en
>
> Those are the fanciest NDBs I've ever seen. Here in the states, unless the
> NDB is also a Locator Outer Marker (LOM) most of them look like a plain 
> old
> fasioned dipole.  Generally the Outer Marker (OM) which is not an LOM 
> looks
> like a VHF corner reflector pointed straight up about 5 miles from the end
> of the runway.
>
> The NDB at the Gladwin MI airport is about 100 yards to the south of the
> runway and quite visible.  Small building for the equipment and the 
> dipole.
>
> "Most" NDBs are being decomissioned here in the states. Few new planes 
> even
> have the capability of receiving them. Instead they are building GPS
> overlays which is an approach that only exists in the GPS receiver 
> software.
>
> In the old days it was not uncommon to create your own approach off an AM
> station. Not legal, but they worked quite well.
>
> Roger Halstead (K8RI and ARRL 40 year Life Member)
> N833R - World's oldest Debonair CD-2
> www.rogerhalstead.com
>>
>> 73, DX, de Pat AA6EG aa6eg at hotmail.com;
>>                  Skype:  Sparky599
>>
>>>From: "Jim Jarvis" <jimjarvis at verizon.net>
>>>To: <towertalk at contesting.com>
>>>Subject: [TowerTalk] FW: antenna
>>>Date: Thu, 22 Jun 2006 16:06:36 +0000
>>>Eric,
>>>
>>>If the antenna is just off the E70, then I found it on
>>>Google Earth.  44deg 56m 59s North x 0 deg 11m 21s East sound about 
>>>right?
>>>
>>>Interesting mystery.  While I pour through international allocations in
>>>various services, I'm hoping one of my french friends can assist.
>>>
>>>Good cycling!
>>>
>>>Jim Jarvis, n2ea
>>>International Business Development
>>>732 548 5573 office
>>>443 618 5560 cell
>>>jimjarvis at ieee.org
>>
>>
>> _______________________________________________
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>>
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