[TowerTalk] Tribander Traps

[K9MA]

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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-- 
Scott  K9MA

k9ma at sdellington.us