[MAMS] White box 10GHZ question

[MARK K8MD]

Yes at the bottom of waveguide I stuck a piece on .141 exposing center of wire in waveguide to send signal up waveguide. This was with an sma that screwed  in at that point. I'm also looking to use the best length in there.  

--- On Tue, 4/10/12, aa9il at sbcglobal.net <aa9il at sbcglobal.net> wrote:

From: aa9il at sbcglobal.net <aa9il at sbcglobal.net>
Subject: Re: [MAMS] White box 10GHZ question
To: "Mid-America Microwave Society" <mams at mailman.qth.net>
Date: Tuesday, April 10, 2012, 1:10 PM

Hi all
I had a white box assembly and also the 2 ft dish.
It sounds like the assembly is a plunger attenuator.
If you looked in the wavegude, there will be a strip
of attenuator material parallel to the narrow wall
of the waveguide (some vane attenuators will pass
a strip of attenuation material through the wide
wall of the wave guide).

for my transverter, I pass the coax from the sma
relay to a WR90 to sma transition bolted on at
the dish.

Its been along time since I saw the white box
'guts' but I think the whitebox RF assembly
had a transtion to waveguide that had the
attenuator built in to it (?) - the conversion
had that removed and the RF assembly had an
SMA connector added to it.

Hope this helps but yes you would want to 
have a regular sma to WG adapter bolt to
the dish and feed the transverter with
a short run of sma to sma coax.

73 de Mike


--- On Tue, 4/10/12, Zack Widup <w9sz.zack at gmail.com> wrote:

> From: Zack Widup <w9sz.zack at gmail.com>
> Subject: Re: [MAMS] White box 10GHZ question
> To: "Mid-America Microwave Society" <mams at mailman.qth.net>
> Date: Tuesday, April 10, 2012, 10:11 AM
> Hi Mark,
> 
> Do you have any photos? I would guess that your described
> mod will work. It
> would help to see what you're working with, though.
> 
> 73, zack W9SZ
> 
> On Tue, Apr 10, 2012 at 10:05 AM, MARK K8MD <k8md at sbcglobal.net>
> wrote:
> 
> > I gutted my Whitebox dish an used only the power supply
> for operating
> > Transverter and amplifiers. Worked pretty good but took
> it down with plans
> > this summer to place on higher tower that is only half
> up.
> >
> >  I needed Surgery on left hand to do more work. I
> will be ready in 6 to 8
> > weeks to get things up after healing. What I'm curious
> about and looking at
> > the wave guide  with splash for feed I notice on 3
> different units a spring
> > loaded device, a screw kinda device and third one
> similar to the screw
> > type. Asking a person I know who worked for a company
> installed the white
> > boxes for communication full-duplex. He says that it
> was to attenuate
> > signal enough so transmit and received would not
> interfer with each other
> > (like for desense).
> >
> > I am wondering if I remove the piece (attenuator) and
> cover the hole with
> > brass will I gain anything by removing it from
> Waveguide. It seems to me
> > that I might be losing signal. It may be small but I
> want to get the most
> > out of the system. I have someone who has taken that
> piece is going
> > optimize it as he did with his home brew 10ghz. He has
> a complete lab at
> > home good to 40ghz and his portable 10ghz, using small
> dish hears real well.
> >
> > Set-up in DIsh is Kuhne XVTR, cascaded DEM amps 8
> watts  and Kuhne pre-amp.
> >
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