[CQ-Contest] Stubs

[Charles Harpole]

Further question..... with a correctly made stub, what is its band of
protection?  50kc from the design frequency or 100kc or more still provides
null protection?????????
Charly


On Mon, May 6, 2013 at 7:49 PM, Joe <nss at mwt.net> wrote:

> 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
>
> --
> Sig
> The Original Rolling Ball Clock
> Idle Tyme
> Idle-Tyme.com
> http://www.idle-tyme.com
> ______________________________**_________________
> CQ-Contest mailing list
> CQ-Contest at contesting.com
> http://lists.contesting.com/**mailman/listinfo/cq-contest<http://lists.contesting.com/mailman/listinfo/cq-contest>
>



-- 
Charly, HS0ZCW