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Re: [CQ-Contest] Stubs

To: "Joe" <nss@mwt.net>, <cq-contest@contesting.com>
Subject: Re: [CQ-Contest] Stubs
From: "Jim" <n2nrd@comcast.net>
Date: Tue, 7 May 2013 22:12:45 -0400
List-post: <cq-contest@contesting.com">mailto:cq-contest@contesting.com>



Some info from K1TTT site on stubs. Listed under filters.
http://www.k1ttt.net/technote/techref.html

Jim, N2NRD.

----- Original Message ----- From: "Joe" <nss@mwt.net>
To: <cq-contest@contesting.com>
Sent: Monday, May 06, 2013 8:49 AM
Subject: [CQ-Contest] Stubs


Getting ready for Field Day here.

The only bands we seem to have problem on are 40 & 20 with the two stations hearing each other.

So plan on making up a pair of stubs, for each station.

Now from wat i have found seems pretty simple. and will this actually be correct?

It looks like the 1/4 wave (electrical) on 40 un shorted will block 0 an pass 20 yes?

and the exact same stub shorted will pass 40 and block 20  yes?

so adding at the far end a small SPST toggle switch should make a easy switch 20 or 40 stub yes?

Now I plan on using them in the usual manner right at the rigs with a "T" connector.

To make them we plan on using a MFJ 259B

The way they say to make a stub using it is pretty plain and straight forward and easy, "BUT"........

I'm assuming I should include the "T" when making the stub to have it include the extra length it is making.

Now what do I do with the open end of the "T"?

does it need to me terminated? like with a 50 ohm dummy load? o9r left open is ok, or what?

Anyone?

Joe WB9SBD

For Field Day The Yellow Thunder Amateur Radio Club
WB9FDZ
The field Day Zombies


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