[TowerTalk] Cushcraft/MFJ Traps

[K9MA]

I disagree, Jim. If trap losses were really significant, 1.5 kW would 
burn them up very quickly. Sure, a trapped beam is less effective than 
full sized monobanders, but can be made to work quite well. Witness the 
venerable TH7, which I used for 29 years very successfully. Not everyone 
has room even for a full-sized trapless tribander.

I recently replace the TH7 with trapless tribander, not because the TH7 
performed poorly, but because I was concerned about bugs getting into 
the traps. It was almost 30 years old, and, as far as I could tell, 
performed exactly like it did when it was new.

73,
Scott K9MA




On 9/12/2019 14:42, Jim Brown wrote:
> On 9/12/2019 11:22 AM, K9MA wrote:
>> The moral of the story is don't even think about going to the trouble 
>> of putting up an MFJ/Cushcraft beam without taking apart all the 
>> traps and fixing the above problems.
>
> I have two very different takes on this. First, traps are an 
> inefficient way to build a multi-band antenna. That means they suck up 
> gain. Also, because the elements are shorter, their radiation 
> efficiency is reduced. The best multiband antennas don't use traps.
>
> Second, buying ANYTHING from MFJ is probably a bad idea. I was VERY 
> disappointed when G0KSC farmed out the NA production of his smaller 
> antennas to MFJ a few years ago. I've been very impressed with his 
> designs.
>
> 73, Jim K9YC
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-- 
Scott  K9MA

k9ma at sdellington.us