IngeMAR,
you forgot to tell us the op. temp range....and frequency up to 100Ghz? (>
wouldn't do the trick)...
jk
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Brian Ellis
Sent: Friday, December 17, 2004 10:43 AM
To: [log in to unmask]
Subject: Re: [TN] Wanted: TN's best-on-coax-soldering
Ingemar
I'm no expert on µwaves, although I have done a wee bit. However, I've
just finished a book review which may, or may not be relevant. I'm
attaching a copy, which should get to you, but not the net list.
My initial reaction to your idea is the effect on the characteristic
impedance and increased losses due to skin effect, if I understand you
correctly.
Brian
Ingemar Hernefjord (KC/EMW) wrote:
> Making microwave 'boxes' got its challenge. Oftenly. Now, SMA coax through
aluminium wall, center pin soldered on teflon board. Mismatch. Naturally.
But design guys do not always listen. So, after tempchanges, the expected
failure happens of course. Not necessary to tell what. There are many
solutions when you make new design, but I have to give clever advice for
what's already frozen and in production. Other solder? Z-link? Silver epoxy?
etc...Omitted all but one: much longer terminal strip. If you solder a strip
which in n times longer, you'll 1)get a much stronger joint, 2)no
dentrimental impact on the signal(>40 GHz), 3) coax plugin/plugout
longitudinal forces will not have same negative impact. When I say solder, I
mean soldering all along the strip, literally bury the longer strip in
solder.
> What does the expertise think? Am I right?
> Will ask humble Oklahoma fast triggering Lucky Steve if he's willing to
add pic to world famous cabinet..
>
> Ingemar Hernefjord
> Ericsson Microwave Systems
>
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