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----- Original Message -----
From: "Peter Gottlieb" <hpnpilot@...>
To: <hp_agilent_equipment@...>
Cc: "David" <dgminala@...>
Sent: Tuesday, March 19, 2013 8:35 AM
Subject: Re: [hp_agilent_equipment] Re: Screw set
recommendations

That is correct, most screws are 4-40, 6-32 and 8-32. For
rack mounting mostly
10-32 and 10-24. The first number is the screw size the
second is threads per
inch. For flat head (countersunk) fasteners note that
there are two
countersinking angles used, 82 degrees is most common but
you will find
shallower 100 degree ones used in aircraft applications
(and metric commonly
uses 90 degrees). Older HP equipment used Phillips heads
but there has been a
move to Pozidrive and there can be a mix of Phillips and
Pozidrive, and UNC and
Metric even in the same instrument!

There are many fastener suppliers, I've used fastenal.com
and the like. McMaster
has everything and around here seems able to get you a box
of screws the next
day even if you order at the end of the day but they are
more expensive than
Fastenal and other hardware suppliers.

Peter

-hp- changed to Pozidriv when I worked for them in the
mid- 1960 to 1970s. Pozidriv _look_ like Philips but are
not. The screw heads have cross marks between the slots.
Pozidriv screwdrivers are still made but are not generally
carried by hardware stores because they are considered
obsolete. I got my set via Amazon. I don't think Pozidriv
or any other cross-slot screws were much used for set
screws. There are many different slotted head and socket
heads used. Google searches will find articles describing
them. Its important to identify the head you have and use
the right tool because the wrong one will damage the heads.


--
Richard Knoppow
Los Angeles
WB6KBL
dickburk@...



------------------------------------

Yahoo! Groups Links

I bought a rather odd combination of things on eBay.

* HP Precision waveguide termination.
* HP X752C 10 dB directional coupler
* X486A thermistor power sensor
* cable for power sensor.



I mainly wanted the termination, but done something I'm sure many have done
before, they they think

"Well, that might be handy one day..."

so I bought the combo.

I'm interested to know what would be involved in using that X486A as a small
battery powered power meter for very rough measurements in a field. I can't find
any details on the Agilent web site.



I know it used with a 432A, but I don't want to buy one of them. I was hoping to
donate this to my radio club and get someone else to convert it into a portable
power meter.



--
Dr. David Kirkby Ph.D C.Eng MIET

I'm puzzled by this auction




for an HP termination, coupler, power sensor and cable, which *apparently*,
quoting from the eBay site:

"Sold for: US $196.40"

But it did *not* sell for that much, as I bought it and my offer of $140 was
accepted. So it sold for $140.00, not $196.40.

This got me thinking. People look at past auctions to get some idea of the value
of something. If the true selling price is inaccurate, as it is here, it will
give an inflated view of what items are selling for. That will probably result
in the perceived value of something being increased, and so people pay more and
eBay profit from higher final value fees.

That is correct, most screws are 4-40, 6-32 and 8-32. For rack mounting mostly
10-32 and 10-24. The first number is the screw size the second is threads per
inch. For flat head (countersunk) fasteners note that there are two
countersinking angles used, 82 degrees is most common but you will find
shallower 100 degree ones used in aircraft applications (and metric commonly
uses 90 degrees). Older HP equipment used Phillips heads but there has been a
move to Pozidrive and there can be a mix of Phillips and Pozidrive, and UNC and
Metric even in the same instrument!

There are many fastener suppliers, I've used fastenal.com and the like. McMaster
has everything and around here seems able to get you a box of screws the next
day even if you order at the end of the day but they are more expensive than
Fastenal and other hardware suppliers.

Peter

I'm puzzled by this auction



for an HP termination, coupler, power sensor and cable, which *apparently*,
quoting from the eBay site:

"Sold for: US $196.40"

But it did *not* sell for that much, as I bought it and my offer of $140 was
accepted. So it sold for $140.00, not $196.40.

This got me thinking. People look at past auctions to get some idea of the value
of something. If the true selling price is inaccurate, as it is here, it will
give an inflated view of what items are selling for. That will probably result
in the perceived value of something being increased, and so people pay more and
eBay profit from higher final value fees.

--
Dr. David Kirkby Ph.D C.Eng MIET

--------------------------------------------------------------------------------

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--- In hp_agilent_equipment@... <mailto:hp_agilent_equipment%40yahoogroups.com>, "laurens_db" <laurens101@...> wrote:

Hei - European dweller here.

I have some old HP equipment, which uses US size (Unified Thread Standard?)

screws. These are hard to get locally, so I plan to purchase some from the US, though of course time and postage is a hassle, so I'd like to just buy a set or two of the most common sizes used in test equipment.

I'm rather confused by UNC, UNF, UNEF and what sizes are common - here I

would just get a bunch of pozidrive M2,5, M3 and M4 in various lengths 6mm-16mm and be done with it.

Can anyone offer some tips as to the common sizes (dia. & length, and

thread) to buy, or point me to a set.

The most commonly used screws in older American-made equipment are UNC (Unified National Coarse) thread screws. Of those, the most common sizes are 4-40, 6-32 and 8-32.
For larger screws, a mixture or UNC and UNF (Unified National Fine) screws were used; most commonly 10-32 (UNF) and 10-24 (UNC).
Of course, the lengths of screws varies almost as much as colors of the rainbow. You'll have to decide for yourself which lengths you'll need. I suggest 1/4", 3/8" and 1/2" lengths to start. For in-between sizes, you can get terminal crimp tools that have provisions for cutting screws. They work very well.

If you're looking to order from a US vendor, I suggest . They have almost EVERYTHING that could be classified as hardware. Very reasonable prices, no minimum, and they ship overseas.

Cheers,
Dave M

--------------------------------------------------------------------------------

No virus found in this message.
Checked by AVG - www.avg.com <>
Version: 10.0.1430 / Virus Database: 2641/5688 - Release Date: 03/19/13

Most US set screws are #4-40.
A few are the bigger #6-23

The smaller (#2-56) and larger (#8-32) are very rare.
Very occasional you might see an odd number size (#5) but it's rare.

Those are the only US sizes used, AFAIK.

Hex (Allen) are the most common;
slotted are next;
some WWII gear uses Bristol Spline;
Torx and others are just about unknown.

Basically, you only really need hex set screws in #4-40 & $6-32.

If you just need a few, email me off-list.

Best,

-John

==========

Hei - European dweller here.

I have some old HP equipment, which uses US size (Unified Thread
Standard?) screws. These are hard to get locally, so I plan to purchase
some from the US, though of course time and postage is a hassle, so I'd
like to just buy a set or two of the most common sizes used in test
equipment.

I'm rather confused by UNC, UNF, UNEF and what sizes are common - here I
would just get a bunch of pozidrive M2,5, M3 and M4 in various lengths
6mm-16mm and be done with it.



Can anyone offer some tips as to the common sizes (dia. & length, and
thread) to buy, or point me to a set.

------------------------------------

Yahoo! Groups Links

John,
I stand corrected (worthless) I get it. From my perspective though BWOs
are interesting. I'll see if I have one that works below 4GHz and try it.
If not, maybe I'll buy one from the guy that made the original posting.

Thx,
Chuck Lippmeier

--- In hp_agilent_equipment@..., "J. Forster" <jfor@...>
wrote:

I didn't say useless, I said worthless.

In general, SS stuff, like YIGS, are pretty cheap up to C or X band.
There
is loads of the stuff around cheap.

Once you get to K band (12.4 GHz) the stuff gets scarcer, and anything
above 26 GHz is rare... there was never much made. Even off-brand stuff
like Hughes still brings big money.

The BWOs are failure prone and require multiple, HV suppliues. The
suppliues are often hybrid (tube & transistor) and are a PITA to work
on.

It's not that the sub-K band BWO units don't work. It's just that there
are easier, probably cheaper ways to get the function.

-John

=================

I have 2 of these mainframes and a few plugins. I was only interested

in

rather low frequencies when I acquired it so I haven't tried mine on
anything over 1GHz. I use it or sometimes my HP8601 with my HP8407

Network

Analyzer.

However, I was fascinated by my reading about the BWO and the plugins

that

use them. When I was playing with this equipment I didn't have

anything

that could measure frequencies that high. Since then I have acquired a
SignalHound SA and now that you've reminded me of my interest, I might
just dust off the 8690 and try some of the BWO plugins at least up to

the

SignalHound limit of 4GHz.

I'm curious though, what is it about most of the BWO plugins that make
them useless below K band?

Thx,
Chuck Lippmeier


--- In hp_agilent_equipment@..., "J. Forster" <jfor@>
wrote:

FWIW, the ones with BWOs, except those for K band and above, are

almost

worthless. There are some that are SS which have some use.

Best,

-John

===========

I'm helping with the getting a large collection of equipment and

parts

up

for sale. The smaller stuff will go on a store and the E.

But I need to start clearing out some of the bigger older true
boat anchors.

In the first pass there are a large number of 8690 plugins, if

there

is any interest let me know.

Make an offer, if you close to NW Oregon I can bring them to the
Seaside ham fair in June, if not I can take more pictures but

please

remember shipping costs.

So far I have not found a frame to plug them into.