[CQ-Contest] TH7 Replacement

[Barry]

Rule #1 of minimizing maintenance:  Don't put moving parts somewhere 
where they are hard to get to for repair/replacement.

Barry W2UP


On 8/7/2017 11:59 AM, Jim Brown wrote:
> If you don't need to tri-plex it to two radios, it's hard to beat a 
> SteppIR.  My neighbor K6XX has wrangled my straight 3-el at the top of 
> my 120 ft tower without difficulty.  Standard procedure is to assemble 
> and test it on the ground, then remove the elements, pull both 
> elements and boom up the tower, and reassemble.  That straight 3-el is 
> light enough for one strong guy to handle pretty easily, and it's gain 
> is comparable to any high-efficiency 3-el Yagi (meaning full-size 
> elements, without traps). If you doubt that, I suggest that you read 
> N6BT's self-published "Array of Light" book, wherein he debunks some 
> of the phony claims and "physics from another universe" used in 
> advertising for some of these products. Some of these ads, for 
> example, claimed greater gain than an ideal monoband Yagi with the 
> same number of elements and boom length.
>
> If you do need to tri-plex, I'd look at the new products from G0KSC.
>
> 73, Jim K9YC
>
> On 8/6/2017 2:48 PM, K9MA wrote:
>> My 28 year old TH7 needs to come down for maintenance, and I'm told 
>> the trap end caps MFJ now sells don't last long.  I also may be just 
>> a matter of luck that no bugs have moved into any of the traps. So, 
>> I'd really like to replace it with a trapless antenna.  The TH7 has 
>> served me well, having last been put up in 1993. It needs to be 
>> replaced before I'm too old to climb the tower!
>>
>> Here are the requirements:
>>
>> Performance comparable to TH7
>> Boom length 24 feet or less
>> No traps or fragile linear loading
>> Can be assembled on the tower (as was the TH7 in 1993.)
>>
>> At this point, the Skyhawk appears to be my best option, at least of 
>> the tribanders available in this country.  Any experience with the 
>> Skyhawk, or other suggestions?
>>
>> 73,
>>
>> Scott K9MA
>>
>> ----------
>>
>> Scott Ellington
>>
>>   --- via iPad
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>
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