On Apr 8, 2025, at 9:43?AM, Joe Poerschke via groups.io <wb4his@...> wrote:

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Attached is some information on the DB212 antennas.? Perhaps this will help.?

This was factory info from a DB212-2 that was tuned to 47.14 MHz.

73

Joe WB4HIS

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From: [email protected] [mailto:[email protected]] On Behalf Of Roger willey via groups.io
Sent: Tuesday, April 8, 2025 09:28
To: [email protected]
Cc: [email protected]
Subject: Re: [repeater-builder] 6 m repeater antenna

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On Apr 7, 2025, at 5:55?PM, wgwl via groups.io <wgwl@...> wrote:

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Roger,
In hopes of answering your original question, I got my hands on a DB212-2 originally on 37.7MHz and shortened the antennas and matching section for 6?
meters. The 35 ohm matching section (Decibel Products VB-83 cable) was shortened?
to 36.25" end to end. With a UHF T on the end?
and two 50 ohm loads attached resulted in the attached plot. As you can see, the?
exact length is not critical across the band.

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John,
You mentioned "DB factory lengths" in an earlier post. Do you have access to the?
actual factory length chart for 6M ? If so, please share.

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Mike,

How well did the tuning of your antenna on the ground translate to mounting on a tower? What length of pipe did you use when tuning?

Greg
WB9TRO

<Matching Section.jpg>

<6meter DB212-2 matching section.png>

<DB212-2 Information.pdf>

<DB212 (pg 6-7).pdf>