I get the impression that SteppIR viewed it as going past the point of
diminishing returns. They could get almost the performance with much
less wind loads using the trombone elements, thus the DB-36 was born.
Ria,
N2RJ
On Tue, Aug 8, 2017 at 8:42 PM, <john@kk9a.com> wrote:
> Your MonstIR sounds like a fantastic design for those wanting an adjustable
> element full sized beam that covers 7MHz to 54MHz. I wonder why it was
> discontinued? There are certainly rotators and towers that will easily
> handle an antenna this size.
>
> John KK9A
>
>
> To: CQ-Contest Reflector <cq-contest@contesting.com>
> Subject: Re: [CQ-Contest] TH7 Replacement
> From: Ria Jairam <rjairam@gmail.com>
> Date: Tue, 8 Aug 2017 10:20:01 -0400
> List-post: <mailto:cq-contest@contesting.com>
> I have the big one like what they had at 6Y1V. It is not made anymore.
> It is 70ft across straight elements. Full sized on 40.
>
> The DB42 is called the MonstIR but it's not the actual, original MonstIR.
>
> The original MonstIR posts better f/b figures on 40 through 15 than
> even the DB42 but slightly less gain. It is a nightmare for weak
> rotors, towers and masts, all 267lb of it. However it has none of the
> hairpin sweeps that can collect moisture and freeze up and also no
> relays.
>
> My antenna has a 34ft boom.
>
> 73
> Ria, N2RJ
>
> On Tue, Aug 8, 2017 at 8:10 AM, john@kk9a.com <john@kk9a.com> wrote:
>> Gain is a function of boom length however you need enough parasitic
>> elements for the Yagi to work. The MonstIR DB42 has a boom length of 42.5
>> feet with four loop elements and two straight elements. This is the only
>> MonstIR that I see on the SteppIR site so I am guessing that this is the
>> antenna you are referring to. Are only the loop elements motorized? 4
>> elements on a 42.5 foot boom seem to be pretty big spacing for 20m and
>> higher. For example my homebrew 4el 20m OWA beam is pretty wide spaced
>> and it only has a 32 foot boom.
>>
>> John KK9A
>
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