[MLB-WIRELESS] Galaxy (Pacific Monolithics) Mod Help Request

[darrend at ndpgroup.com.au]

Tom, your idea is correct. Just remember that the pcb is designed for 
microwave, and although it may not look correct... it is.

I have modified a few of these including both methods you have mentioned. 
In my comparison tests against a 'real' pac mon passive feed unit, all of 
them were atleast 3-4db less efficient! If that kind of loss is acceptable 
to you then either method should be fine, athough leaving more pcb gives 
you more to clamp the cable to. I used a mini butane torch to heat/remove 
(very carefully) the surface mount components.

My advice is to go grab a 'real' feeder from Hills ( 
http://www.hillsantenna.com.au ) they are around $90 and have an N type 
female termination.

Either way, good luck...

Darren Dreis
Vice President
Melbourne Wireless Inc.
vicepresident at wireless.org.au
http://www.wireless.org.au





"Tom Parker" <tparker at netspace.net.au>
Sent by: owner-melbwireless at wireless.org.au
02/11/2002 06:12 PM
Please respond to tparker

 
        To:     "melbwireless" <melbwireless at wireless.org.au>
        cc: 
        Subject:        [MLB-WIRELESS] Galaxy (Pacific Monolithics) Mod Help Request

Folks,

I'm up to the important stage of a Galaxy (Pacific Monolithics) mod and I
can't seem to find a clear answer as to where I should be attaching the
coax.

I'm put a (large) image of the top of the PCB at
(http://www.wiresncode.com/projects/wireless/galaxy/galaxy.jpg).  It looks
to me like I need to attach the coax centre to A and the shield to B (B is
ground), but I've already had one negative opinion about this.

This web site
(http://www.qsl.net/vk1krf/Pacific_Monolithics/Pacific_Monolithics.htm) give
some info, this site (http://wireless.bur.st/) gives more about half way
down but seems to cut more of the PCB than I would think necessary.  I 
would
expect that I should retain the connection between ground and some of the
elements, but he show them cut here (http://wireless.bur.st/breakconn.jpg)

I've looked around for some info on this, but not come up with much.

Thanks,
Tom

----------------------------------
Tom Parker tparker at netspace.net.au
http://www.wiresncode.com/projects





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