[TowerTalk] Tribander Traps

[K9MA]

Yes, all three bands.

My point is that, forward gain aside, the TH7 had a very "nice" looking 
pattern. That was obvious just from using it, too.

73,

Scott K9MA



On 9/12/2019 16:01, David Gilbert wrote:
>
> 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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>>
>>
>
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-- 
Scott  K9MA

k9ma at sdellington.us