[TowerTalk] Stub tuning

[Tom Osborne]

>> I'm trying to get the stubs hooked up here.  I cut some
>>and they are right where I want them to be, using the MFJ tuner >>option.

> How do you know that Tom?

I cut a couple of stubs and took them to a friend who has a spectrum 
analyser and we checked them on that.  They actually were within about 50 
cycles of where I was trying to get them, which was close enough for me.
>
> How do we know what you are trying to do? Are these 1/4 wl
> shorted stubs designed to act as an open circuit at
> fundamental and short the 2 nd harmonic? Or what?
>
> I'm going to assume they are a bandpass stub.....


Some are open and some are shorted.  They are bandpass stubs, as per K1TTT's 
site, for a multi-transmitter setup I'm trying to get going.

>
> Assuming a shunt stub used for "bandpass" of one band or odd
> harmonics of that band, length of cables or where it is at
> in the system doesn't matter except for attenuation. A
> shorted stub should be 1/4 wl long at the lowest desired
> pass frequency. Always. It will also pass at odd multiples
> of the lowest F.
>

> What are you trying to do Tom?? That's the first thing
> anyone would have to know otherwise every answer is a guess.
>
> 73 Tom

Trying to set up for 2 transmitters.  I want to put the stubs on the output 
of the antenna switch so I can switch the stub when I switch antennas.  I 
don't have any multi-band antennas here.  Thanks and 73

Tom W7WHY