[CQ-Contest] TH7 Replacement

[john at kk9a.com]

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 at contesting.com>
Subject:	Re: [CQ-Contest] TH7 Replacement
From:	Ria Jairam <rjairam at gmail.com>
Date:	Tue, 8 Aug 2017 10:20:01 -0400
List-post:	<mailto:cq-contest at 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 at kk9a.com <john at 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