[Test-Equipment] Waveguide question

[S. Schappert]

John, Dave:

Thanks.  My experience has taught me the small stuff, and I realized after this post that one thing is clear:  I need to crack open the books (again).  Case in point waveguide Zo.  I actually am using the HP X281 A / B connectors exclusively.  The X281B is perfect for transitioning from female "N" connectors on the instruments.  I have been fortunate in that my hardware is good, but occasionally need a sounding board.

Regarding part numbers on eBay, foremost are specific measurements of the waveguide dimensions.  I've actually caught a couple of errors on eBay items.  Just asking for the inside aperture dimensions brings up the confidence level.  Don't want to waste time on the great thing you won on eBay that won't quite work.

I wish to thank this great list and the responders to my query.  Learning is always (well, to a greater extent) guaranteed.

Best regards to all,

-Scott

-----Original Message-----
>From: "J. Forster" <jfor at quik.com>
>Sent: Jan 20, 2006 11:31 AM
>To: Dave Brown <tractorb at ihug.co.nz>
>Cc: Test-Equipment at mailman.qth.net
>Subject: Re: [Test-Equipment] Waveguide question
>
>One more caution. READ the label...  there are diode and bolometer  mounts that look
>a lot like transitions. You don't want one f those.
>
>-John
>
>
>Dave Brown wrote:
>
>> Although waveguide to coax transitions are not difficult to make and
>> adjust you may be better to just buy one, paticularly if you want to
>> use it over the full range of your source/amplifier setup. You want an
>> old HP X281A (or B) or similar. Other manufacturers did (and do) make
>> them.   But the X281A is probably still fairly common. I have a couple
>> here I use reasonably often.
>>
>> The X281A has a type N female coax connector -the B suffix will have a
>> stainless type N or maybe an APC-7 or ??--- I think they were special
>> order versions. So assuming you want type N then stick with an A
>> suffix  if you can't establish the connector type prior to purchase.
>>  I see an H281A on ebay just now- but thats for H band, not X. Beware
>> the prefix!
>>
>> Cheers
>>  Dave B, NZ
>
>
>
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Scott Schappert