[TowerTalk] Tribander Traps

[David Gilbert]

On all bands?

And yes, better F/B doesn't necessarily mean better forward gain.

73,
Dave   AB7E


On 9/12/2019 1:44 PM, K9MA wrote:
> I actually measured the pattern of my TH7 and its replacement, a JK 
> Mid-Tri, under exactly the same conditions. The TH7 pattern actually 
> looked a bit better, with better f/b. I can't compare forward gain, of 
> course.
>
> 73,
> Scott K9MA

>
> On 9/12/2019 15:41, David Gilbert wrote:
>>
>> You know that power loss doesn't equate to lost pattern gain, right?
>>
>> Trapped tribanders have shorter elements, which has an effect on 
>> pattern, and they have non-optimal element spacing for any particular 
>> band, which again affects pattern gain.
>>
>> I'm not saying that trapped tribanders don't have utility, but 
>> compared to a modern non-trapped design they suffer from more than 
>> just the heat they generate.
>>
>> Dave   AB7E
>>
>>
>> On 9/12/2019 12:55 PM, Glenn Pritchard wrote:
>>> Trapped yagis don't suck up gain, another myth easily dis-proven. I 
>>> have
>>> used trapped yagis and mono banders over the course of 30+ years and 
>>> at one
>>> time had the big Wilson 40M3 I believe it was called, 3 full sized 
>>> 40 meter
>>> elements on a 40' boom..
>>> It is shown that maybe a trapped yagi has at worst a 0.6 dB loss over a
>>> full sized yagi of the same band. It's no surprise that I like trapped
>>> yagis because of space restrictions right now and having the ability 
>>> to add
>>> 40 meters to one is skookum.
>>>
>>> I would like to have mono banders only for 40 and 20 again, perhaps 
>>> one day.
>>>
>>> Glenn, VA7UO
>>>
>>
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>
>