[Antennas] Small Triband Beam

Fri Feb 27 18:00:47 EST 2015

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."
>>>> ______________________________________________________________
>> Antennas mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/antennas
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Antennas at mailman.qth.net
>>>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>>>>>> -----
> No virus found in this message.
> Checked by AVG - www.avg.com
> Version: 201505751 / Virus Database: 4299/9192 - Release Date: 02/27/15
>>>
-- 
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
-----
No virus found in this message.
Checked by AVG - www.avg.com
Version: 201505751 / Virus Database: 4299/9192 - Release Date: 02/27/15
______________________________________________________________
Antennas mailing list
Home: http://mailman.qth.net/mailman/listinfo/antennas
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Antennas at mailman.qth.net
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
______________________________________________________________
Antennas mailing list
Home: http://mailman.qth.net/mailman/listinfo/antennas
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Antennas at mailman.qth.net
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html