[CQ-Contest] Stubs

[Tobias Wellnitz]

Hi Joe,

check out the stubs I built for ED1R:
http://www.dh1tw.de/coax-stubs-for-20m-and-40m

Be aware that the voltages at the end of the open stub can get very high!

73 Tobias
EA4/DH1TW


On Wed, May 8, 2013 at 12:28 AM, Joe <nss at mwt.net> wrote:

> Anyone with the answer about the "TEE" connector?
>
> When making the stub because the "TEE" will introduce some added length,
> so to cut the cable right on. I'd have to have the "TEE when making the
> cable with the MFJ unit.
>
> but what should I do with the other end of the "TEE"  leave it open? put a
> 50 dummy across it?  etc?
>
> Joe WB9SBD
>
> Sig
> The Original Rolling Ball Clock
> Idle Tyme
> Idle-Tyme.com
> http://www.idle-tyme.com
> On 5/6/2013 7:49 AM, Joe 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
>>
>>
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