[Antennas] Small Triband Beam

[K8MLM--- via Antennas]

Concur get a HEX BEAM and you can get 5 bands... sometimes 6 bands if it  
includes 6 meters.
 
A HEXBEAM actually has better radiation efficiency than a TRI-BAND BAND  
beam.  
 
The TRI-BAND BEAM has traps and traps have loss.  The TRI-BAND BEAM  may 
advertise a higher theoretical gain than the HEX BEAM, but because of the  
traps 
 
(loss due to just plain resistance; e.g., traps include an  inductor and 
capacitor and both add resistance and loss to the system...Traps  also get 
dirty or wet inside and that equates to loss) 
 
the TRI-BAND BEAM will not have the same realized gain  as a full size 
MONO-BAND Beam.  The TRI-BAND BEAM may have an advertised  gain similar to that 
of an equivalent MONO-BAND Beam, but it will not have  a similar radiation 
efficiency because of the traps.  
 
The HEX BEAM uses 2 full size elements.  Although they are bent  or 
zigzagged to fit the hex shape they are full size and are a continious  wire / no 
traps / no loss.  It won't offer the same advertised gain number  as a 
TRI-BAND BEAM but because it is a more efficient RF radiator they will both  
radiate equally the same.  
 
As stated before, the nice advantage of a HEX BEAN is the shorter turning  
radius with nearly the equivalent gain as a 2 ELEMENT BEAM.  Wind load  and 
wind induced torque is essentially zero.
 
Bob
K8MLM
   
 
In a message dated 2/27/2015 4:22:23 P.M. Eastern Standard Time,  
antennas at mailman.qth.net writes:

How  about a HEXBEAM ??  Small but packs some punch...more than HF5B  
Butterfly.






-----Original Message-----
From:  David C. Hallam <dhallam at knology.net>
To: n8de  <n8de at thepoint.net>; Ross Primrose <n4rp at n4rp.com>
Cc: antennas  <antennas at mailman.qth.net>
Sent: Fri, Feb 27, 2015 3:59  pm
Subject: Re: [Antennas] Small Triband Beam


Has anyone had any  experience with the Butternut HF5B butterfly beam  
antenna?

David
KW4DH

On 2/27/2015 2:38 PM,  n8de at thepoint.net wrote:
> He said 12' turning RADIUS .. not  diameter.
>
> 73
> Don
> N8DE
>
>
>  Quoting Ross Primrose <n4rp at n4rp.com>:
>
>> That's well  over his turning radius limit.  The Cushcraft MA5B might be
>> a  better fit...
>>
>> 73, Ross N4RP
>>
>> On  2/27/2015 1:17 PM, n8de at thepoint.net wrote:
>>> Cushcraft A3S is a  well-performing tri-bander.
>>> Have on up here at 34' and have  worked over 300 DXCC with it the  
>>> past three  years.
>>> 73
>>> Don
>>>  N8DE
>>>
>>>
>>> Quoting "David C. Hallam"  <dhallam at knology.net>:
>>>
>>>> I am looking  for ideas about what would be a good small triband beam.
>>>>  About 20 ft. would be about as high up as I could get it. Ideally  the
>>>> turning radius would not more than 10 ft but maybe  could go to 12 ft.
>>>> My rig runs 900-1000W DC input. lp  support this email list: 
>>>>  http://www.qsl.net/donate.html
>>
>>
>> --  
>> FCC Section 97.313(a) "At all times, an amateur station must use  the 
>>  minimum transmitter power necessary to carry out the  desired  
>> communications."
>>
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>
>
>
>
>
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-- 
There are two possible  outcomes: if the result confirms the hypothesis, 
then 
you've made a  measurement.
If the result is contrary to the hypothesis, then you've made  a discovery.
Enrico Fermi



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