[Antennas] Identify this antenna ? (DECIBEL DB201-H) !

[Chris Boone]

DB 201 antennas have the radials longer than the vertical section....have
never figured out why but they all always that way....The cermanic base is
just that....nothing else...
You would have to lengthen the vertical section (including the trambone
downlead) and the radials to be used on 2mtrs..
Would be better to cut it down to the 220 MHz band but then that is only a
NA band and not available AFAIK in Europe.

Chris
WB5ITT

> -----Original Message-----
> From: antennas-bounces at mailman.qth.net 
> [mailto:antennas-bounces at mailman.qth.net] On Behalf Of 
> Demetre Koumanakos
> Sent: Thursday, January 06, 2005 3:09 PM
> To: Antennas at mailman.qth.net
> Subject: Re: [Antennas] Identify this antenna ? (DECIBEL DB201-H) !
> 
> 
> I found the Decibel site, the antenna is the DB201-H, managed 
> to find a couple of documents, apparently there is no coil in 
> the base. The dimensions are a bit confusing on this antenna, 
> the model is a 170 
> Mc antenna and should have 44 cm radials, just as the 
> radiator (base to 
> bending tip) should be for this frequency. 
> The dimensions here are 40 cm radiator (this would make the radiator 
> freq. 180-185 Mc) and the radials 71 cm (105 Mc) ???
> Any idea why the antenna dimensions are so strange???
> 
> 73
> Demetre - SV1ENS
> 
> 
> > Is there a model number anywhere on the antenna?
> > Decibel is still in business and has a web-site.
> > 
> > 73,
> > Randy
> > WX5L
> > 
> > 
> >> 
> >> From: "Demetre Koumanakos" <demetre at fastmail.ca>
> >> Date: 2005/01/06 Thu PM 05:13:38 GMT
> >> To: Antennas at mailman.qth.net
> >> Subject: [Antennas] Identify this antenna ?  "DECIBEL"
> >> 
> >> Happy New Year to all group members...
> >> 
> >> While visiting a relative "down south" for Christmas I 
> found a used 
> >> VHF ground plane. The vertical radiator is a closed monopole 41 cm 
> >> from the base to the highest position where it begins to 
> bend down to 
> >> the base again. There are 4 horizontal radials 73 cm each from the 
> >> tip to the center of the base. The radiator is marked "decibel".
> >> I hooked it up to my antenna analizer and got 171 Mc as the best
> >> match, if my analizer tuned higher I assume the antenna would match
> >> at 200 Mc or so...
> >> 
> >> I want to tune this antenna for 2m, in theory I know what 
> to do, but 
> >> a ceramic dome installed between the base and where the upward 
> >> section of the radiator troubles me, is this a casing of a coil or 
> >> something similar ??? Before I start dimentioning the new aluminum 
> >> tubing, I would like to know all I can find out about this antenna.
> >> 
> >> Can anyone help ??
> >> 
> >> 73
> >> Demetre - SV1ENS
> >> 
> >> 
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