[time-nuts] Semi-OT: Hardware for WR-90 waveguide sections?

[Robert Atkinson]

Hi,
Not strictly true. Material is not important apart from environmental (corrosion) issues, but that is not the only concern. WG-16 (British) / WR 90 flanges are not dowelled. They rely on the fastners for alignment. The correct fastners are 5/32" shoulder screws (0.1557" dia 6-32 thread). The precsion shoulder locates the flanges. 5/32" bolts (a bolt has a plain shank) are a good second choice but you will probably have to pack them with washers as the grip length won't match ;-) If you have to use screws, at least align two diagonal holes with 5/32" dowels while nipping up the first two screws.
 
Robert G8RPI.


--- On Sun, 19/9/10, jimlux <jimlux at earthlink.net> wrote:


From: jimlux <jimlux at earthlink.net>
Subject: Re: [time-nuts] Semi-OT: Hardware for WR-90 waveguide sections?
To: "Discussion of precise time and frequency measurement" <time-nuts at febo.com>
Date: Sunday, 19 September, 2010, 4:13


k6rtm at comcast.net wrote:
> Not completely OT, as stable and accurate timebases are very useful in microwave systems... 
> What's the proper hardware to use for connecting WR-90 (10GHz) waveguide sections? I figure 8-32 brass or stainless, avoiding anything magnetic. 
> 

whatever fits through the holes in the flanges.

#8 requires a 0.187 hole, #6 requires a 0.156, #4 is 0.125, #2 is 0.109

One reference I have says WR90 has 0.169" holes, so that's #6 hardware.

Whether it is magnetic or not doesn't make any difference.

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