[MAMS] 24/47 GHz

[Zack Widup]

I'm almost to the point of testing out the 12 GHz multiplier. Constructing
it the way I did was a lot of work. I am putting the finishing touch on it
and I might even get it tested tonight to see how much power it puts out.

My version is different than the one W1GHZ has on his webpage. I used 4 pipe
cap filters - one tuned to around 3 GHz, one tuned to 6 GHz and two tuned to
12 GHz; and 7 MMIC's - five ERA-2's and two NLB-310's. They are multiplying
a signal in the 1400 to 1500 MHz range. In this case it is 1485 MHz.

Other than that, I have all the pieces for the 24 GHz system and just need
to put it all together. I have some WR-42 flanges, 90 degree H-bends and a
straight piece of WR-42 I got from here:

http://www.eventhorizons.com/products/commerce/commerce.cgi?product=WR-42&cart_id=1305053786.158

I am custom making the pieces that go between the SDH transceiver and the
waveguide switch I have. Getting those right may be one of the more
difficult parts of this project.

I may get most of this done this weekend. I really needed one more weekend
to get it done, so it wasn't ready for the Spring Microwave Sprint. After
that, I just need someone to test it with. W9ZIH said he would try with me
over about a 5-mile path from his back yard if I wanted to drive up there.
If only gas were cheaper!

73, Zack


On Tue, May 10, 2011 at 1:35 PM, Dave Calvert <kb0pe at yahoo.com> wrote:

> Hi Zack,
> I was wondering how your 24 Gig project is coming along?  Also I am very
> interested in knowing if you had built up the W1GHZ 10 Gig beacon and
> re-tuned
> it for 12 Gig for a 24 Gig L.O.?  I wanted to know before I built up my
> boards
> for this project....  Kinda waiting to hear how the output level and
> stability
> compare to you first L.O.
>
> One question for the group is that although my 24 Gig operating time has
> been
> very limited, I did notice that when the wind would pick up out in front of
> the
> Dish, it almost sound like the wind would push the signal.  Especially when
> there was a lot of dust in the wind.  I am now thinking that the dust and
> wind
> was acting like a floating attenuator that would move in front of the
> Dish.  Has
> anyone experienced this to?  Is this more predominate on 47 Gig's?
>
>
> I was told that if 10 Gig's is good, so will 24 Gig's.  Also, if you can
> work
> each other on 10 Gig with the same amount of RF power and Dish gain on 24
> gig's
> you will work the same distance?  If this is true Zack, we should be able
> to
> catch another 10 Gig opening and then try 24........  I do not have 10
> Gig's at
> the moment but with the DEMI
> 3 watt amp, I was putting out a little under 2.5 watts with the 17 mW of
> drive
> from my old DEMI transverter.  My 24 Gig system is 2 watts but I have
> considerable more gain in the Dish than 10 Gig's.   What are some of the
> distances that have been achieved on 24 Gig's?
>
> 73,
> Dave
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