Date   

Re: Connectors, adaptors etc

Miroslav Pokorni
 

I went and checked that auction #5714013511. Seller says for those BNC
adapters:

a.. 50-Ohm
b.. Nickel Plated
c.. DuPont� Delrin Insulator
d.. These are high quality adapters; not cheap imports
The first thing is that insulator in a BNC is Teflon or a variation of it.
Never heard of Delrin used for that purpose; Delrin is fine material for
gears and mechanical pieces but not for connector.

The second thing is nickel plating, it is too shinny to be good. All
reputable connectors have that dull sheen, while shine is found on
connectors sold by Radio Shack and Pasternak Enterprises. The latter is a
supplier of RF components of shady reputation. I believe that this shinny
plating is actually electroless chrome plating, which is very thin and
normally not used on connectors, it is commonly used as a base for plating
on non-conductive materials or for cheap 'nickel plating' appearance.

The seller's e-bay name is 'testparts' and a number of other parts that he
offers on e bay seem to bear his part number, for example TP060 for RF to
BNC adapter.

By the way, if Roland is game to try, this seller offers a set of four
adapters, two of which are N-male to N-female, as an auction # 5713719399.
Those adapters look like straight out Pasternak's catalog, I am not
recommending unless they will be used in audio band.

Regards

Miroslav Pokorni

----- Original Message -----
From: "Richard W. Solomon" <w1ksz@earthlink.net>
To: "Craig Sawyers" <c.sawyers@tech-enterprise.com>; "TekScopes"
<TekScopes@yahoogroups.com>
Sent: Saturday, August 07, 2004 6:59 AM
Subject: RE: [TekScopes] Connectors, adaptors etc


I find BAProducts.com to have a better selection and much better prices.

73, Dick, W1KSZ

ps: one good plug deserves another !!

-----Original Message-----
From: Craig Sawyers [mailto:c.sawyers@tech-enterprise.com]
Sent: Saturday, August 07, 2004 6:36 AM
To: TekScopes
Subject: [TekScopes] Connectors, adaptors etc


Let's just put it this way: any cable that can be terminated with
BNC or SMA
would give way long before connector becomes limiting item in
that assembly.
Incidentally, an eBay seller called testparts sells rf adaptors at pretty
decent prices. Just as an example, item 5714013511 is for five items, BNC
T, BNC-RCA, and three BNC-SMA at $19.95 on buy it now, or item 5714013497
is
four N-SMA adaptors for $15.

For some reason I have this guy's store in my favourites, so I must have
bought something from him at some stage.

Craig





Yahoo! Groups Links






577 Part Needed

Darrin Conniff <djconniff@...>
 

Hello All,

I just received a 577 D2 purchased on eBay. It is missing the Horizontal
Volts/Division knob.

If anyone has a spare from a parts 577, I would be willing to pay for the
knob and shipping, plus I have several parts scopes and spare parts if
interested.

Thanks in advance.

Best regards,

Darrin


Re: Things I have learned this week (Tek-wise)

scoper796 <scoper796@...>
 

I think it was the residue of the ZEP degreaser that was the culprit.
It seemed to smell up the house when I put the scope in the oven. I
notice that some of the paint that I bake in there does the same
thing.

Maybe it was the radioactivity! I wondered when the discussion of the
radioactive 519's was going on if the problem was limited to 519's.
Surely they must have used other models of Tektronix equipment in
radioactive environments. I would like to get one of those geiger
counters.



--- In TekScopes@yahoogroups.com, "Miroslav Pokorni"
<mpokorni2000@y...> wrote:

----- Original Message -----
From: "scoper796" <scoper796@y...>
To: <TekScopes@yahoogroups.com>
Sent: Saturday, August 07, 2004 12:30 PM
Subject: [TekScopes] Things I have learned this week (Tek-wise)


Saturday is always a quiet day for me, and so I now have a place
to
post some misc ramblings. What have I learned this week? Let's
see.

Can we learn some more from your experience?



I learned that you can wash a scope out pretty good with a garden
hose and not hurt anything. It IS wrong to assume that baking the
scope in the wife's oven at 160 degrees for hours will not give
everyone in the house a headache though. And that a rack-mount 504
will not quite allow the oven door to close. LOL
Did you mean literally that baking in oven would give everyone in
the house
headache or you just meant that figuratively, as causing annoyance?
If it is
that baking resulted in real headaches, what do you think was the
cause:
fumes, outgassing?

Regards

Miroslav Pokorni


Re: Digest Number 1190

Miroslav Pokorni
 

Yes, 18 Gig is for good quality run of the mill, but RF Johnson has a series
that is speced to 11 Gig and on the other side of spectrum, AMP has a series
speced to 26.4 Gig. There are also instrumentation grade, when they are
speced to 26 or 28 Gig, depending on manufacturer and frequently that grade
is called '2.4 mm'.

Regards

Miroslav Pokorni

----- Original Message -----
From: "Don Black" <jeans@nex.net.au>
To: "phila_renewal" <phila.renewal@comcast.net>
Cc: <TekScopes@yahoogroups.com>
Sent: Saturday, August 07, 2004 4:59 AM
Subject: Re: [TekScopes] Re: Digest Number 1190


I believe SMA connectors are rated to 18 G Hz.
Don Black.

phila_renewal wrote:

Oops -- a little more poking around and I see I got things
completely mixed up. N is spec'd. to 11 GHz; BNC to only 4. It's
the BNC that has the inherent low pass -- the N has "worse"
impedance matching due to the uncompensated inductance, but doesn't
have the low pass LC filter characteristics of the BNC (?).

So, in sum, BNC has better impedance matching to 4 GHz than the N,
but the BNC has the inherent LC low pass so things start to roll off
above 4 GHz with the BNC -- is that right? That being the case,
specify BNC or TNC for stuff below 4 GHz, and N above that?

Now, to add to the mix, what about the SMA?

Thanks again,
-Keith




--- In TekScopes@yahoogroups.com, Brooke Clarke <brooke@p...> wrote:


Hi Keith:

I think your data is wrong. The 50 Ohm N, BNC and TNC connectors

all


have identical I.D. and mating pins and sockets, the only

difference


between them is how they mechanically connect. If you hacksaw the
nut/connector from a male connector then you can plug it into any

of the


female connectors.

When H.P. introduced the first microwave network analyzer (8410) I

went


to an all day sales pitch and one of the demos was measuring the S
parameters of a 3 foot length of BNC cable to 12 GHz, and it

looked very


good.

A number of the HP network analyzers use a precision N connector

that's


rated to 18 GHz. Above 18 GHz, no matter how well made the

connector


you can get moding and so for higher frequencies you need to go to
smaller and smaller I.D. connectors.

Also the N connector is used because of it's mechanical strength

so hold


small test sets to the front of the instrument.

Have Fun,

Brooke Clarke, N6GCE

--
http://www.PRC68.com
http://www.pacificsites.com/~brooke/PRC68COM.shtml






Yahoo! Groups Links












Re: RF Connectors / Looking for N f-m adapter

Miroslav Pokorni
 

Hello Roland,

I just came across of an adapter N-male to N-female, sold by hp. Their part
number is 'HP 1250-0597' and listed in their 1998 catalog.

Regards

Miroslav Pokorni

----- Original Message -----
From: "maddisassembler" <320041677522-0001@t-online.de>
To: <TekScopes@yahoogroups.com>
Sent: Saturday, August 07, 2004 5:23 AM
Subject: [TekScopes] Re: RF Connectors / Looking for N f-m adapter


August 7th, 2004


Hello all,

very interesting posting from Brooke
especially on 'connector savers'.

This reminds me of my problem to
find a N-type male-female adapter
as a 'connector saver' for e.g.
expensive signal generators.

I know EMC-labs where equipment
with N-female outlets is used
so frequently with many daily
'screw-on/screw-off' cycles that
the equipment connector wears out
very quickly.

So far I could only find N male-male
or N female-female adapters so I first
have to screw N-f and N-m together to
get my connector saver.

Best regards
-Roland



--- In TekScopes@yahoogroups.com, Brooke Clarke <brooke@p...> wrote:
Hi:

Most of my career was spent in microwave engineering and 90+% of
that
with components using coax connectors.

The SMA connectors were designed to work with semirigid 0.141"
diameter
coax and used the coax center conductor for the male pin, so a
cable was
made up using a couple of male nuts whose shell was soldered onto
the
copper coax shield. The intent of this connector was that you
would
build up a system and then leave it alone. i.e. they are specified
for
a very small number of matings.

This was a problem later when we were making satellite hardware. I
often said that we supplied the hardware free, and only charged the
customer 1$ per page for the test data, which then was shipped in
cardboard boxes. The solution was to use "connector savers" which
is an
adapter SMA-m to SMA-f. A record was kept on each data sheet of
every
mating and after some number the connector saver was replaced. The
connector saver was rated for many more matings than was the base
connector.



Re: Things I have learned this week (Tek-wise)

Miroslav Pokorni
 

----- Original Message -----
From: "scoper796" <scoper796@yahoo.com>
To: <TekScopes@yahoogroups.com>
Sent: Saturday, August 07, 2004 12:30 PM
Subject: [TekScopes] Things I have learned this week (Tek-wise)


Saturday is always a quiet day for me, and so I now have a place to
post some misc ramblings. What have I learned this week? Let's see.
Can we learn some more from your experience?



I learned that you can wash a scope out pretty good with a garden
hose and not hurt anything. It IS wrong to assume that baking the
scope in the wife's oven at 160 degrees for hours will not give
everyone in the house a headache though. And that a rack-mount 504
will not quite allow the oven door to close. LOL
Did you mean literally that baking in oven would give everyone in the house
headache or you just meant that figuratively, as causing annoyance? If it is
that baking resulted in real headaches, what do you think was the cause:
fumes, outgassing?

Regards

Miroslav Pokorni


Re: RF Connectors / Looking for N f-m adapter

Miroslav Pokorni
 

There are several right angle N adapters in catalogs, but did not find any
straight one. Fact that there are no N straight adapters listed, does not
say anything, straight SMA adapters do not appear in any catalog either, but
I own few of them, so someone must be making them.

Amphenol has two adapters listed in 1998 catalog, P/N 82-64 and 82-213;
watch out that you do not end up with 82-64-RFX, it looks like 82-213. I am
sure, you know that RFX series is Amphenol's low cost series, specified to 4
GHz.

Kings has several part numbers for right angle: UG-27C/U, UG-27D/U and
1209-10.

I did not see any specs on reflection, Amphenol or Kings, possibly that can
be found on the company web site. Right angle would have more reflection
than straight one, but I have seen some pretty damn good reflection specs
for BNC and SMA right angle connectors and adapters, so it can be done.
Number that I remember for reflection of SMA was around 1.05.

Those adapters are much more critical for SMA series, because you have to
torque cable connector if avoiding reflection at connector is important and
that torqueing puts a strain on connector body so they brake after awhile. I
guess, that must be the reason why there are 'field replaceable SMA
connector bodies', which are just a connector body with flange and Teflon
insulation, while center receptacle is retained; those replacements are also
made for hermetically sealed connectors, so there must be a demand.

Regards

Miroslav Pokorni

----- Original Message -----
From: "maddisassembler" <320041677522-0001@t-online.de>
To: <TekScopes@yahoogroups.com>
Sent: Saturday, August 07, 2004 5:23 AM
Subject: [TekScopes] Re: RF Connectors / Looking for N f-m adapter


August 7th, 2004


Hello all,

very interesting posting from Brooke
especially on 'connector savers'.

This reminds me of my problem to
find a N-type male-female adapter
as a 'connector saver' for e.g.
expensive signal generators.

I know EMC-labs where equipment
with N-female outlets is used
so frequently with many daily
'screw-on/screw-off' cycles that
the equipment connector wears out
very quickly.

So far I could only find N male-male
or N female-female adapters so I first
have to screw N-f and N-m together to
get my connector saver.

Best regards
-Roland



--- In TekScopes@yahoogroups.com, Brooke Clarke <brooke@p...> wrote:
Hi:

Most of my career was spent in microwave engineering and 90+% of
that
with components using coax connectors.

The SMA connectors were designed to work with semirigid 0.141"
diameter
coax and used the coax center conductor for the male pin, so a
cable was
made up using a couple of male nuts whose shell was soldered onto
the
copper coax shield. The intent of this connector was that you
would
build up a system and then leave it alone. i.e. they are specified
for
a very small number of matings.

This was a problem later when we were making satellite hardware. I
often said that we supplied the hardware free, and only charged the
customer 1$ per page for the test data, which then was shipped in
cardboard boxes. The solution was to use "connector savers" which
is an
adapter SMA-m to SMA-f. A record was kept on each data sheet of
every
mating and after some number the connector saver was replaced. The
connector saver was rated for many more matings than was the base
connector.



Re: 453A canons

Ashton Brown <ashton@...>
 

Hmmm

Once... was about to take a cannon to the independent parts sellers for Canon�. They claimed 'unavailable': the not-latching battery door to a superb Model AL-1 (35mm SLR). A 'temperate' letter to Pres. of Canon USA + Japanese distributor .. elicited a response as can only be called, Ideal. Needing no refs from me to the Canons of Caligula, at all - my camera was provided with a new door, 'services' (and I mean prof. cleaned incl the focal-plane shutter, mirror foam damper renewed, etc.) -- and they would not accept a penny for the extra work (or the RT Fed-Ex) !

Perhaps my appeal to the "beauty and endangered craftsmanship of such a work of art.." helped set the mood, but the generosity was all theirs - I would have been more than pleased to pay for the extra work.

One such event can cause a person to remove *all* the pins from the Corp/Enron doll.. for an extended period. Was worth far more than any saved-$ - just for the endorphins generated. (Gurus say that doing or receiving.. or even observing any act of kindness - simply - strengthens, heals the immune system. I can 'prove' this.)

Canonically,
Ashton



Don Black wrote:

Oh... No, I'm not one of those ;-). Never cleaned a canon in my life.
Don Black.


Rolynn PRECHTL K7DFW wrote:


it's not in any lesser dictionary that I am aware of.

http://www.webster-dictionary.org/definition/merkin


Things I have learned this week (Tek-wise)

scoper796 <scoper796@...>
 

Saturday is always a quiet day for me, and so I now have a place to
post some misc ramblings. What have I learned this week? Let's see.

The big one I guess came from spending several hours trying to track
what looked like an oscillation in the horizontal amplifier of a 502.
I used classic signal-tracing techniques using my 545 shop scope. It
was quite high frequency, and no matter what I did, it seemed to just
appear. Pulling tubes didn't make any difference. Finally, I noticed
that whenever I brought a scope probe near the (unshielded) high
voltage board, the probe picked up huge amounts of the same signal.
In a moment of clarity, I realized that leaving the shielding off the
hi-volt section was the source of the "oscillation." Man, it sure
feels good to solve a problem, doesn't it.

I learned that you can wash a scope out pretty good with a garden
hose and not hurt anything. It IS wrong to assume that baking the
scope in the wife's oven at 160 degrees for hours will not give
everyone in the house a headache though. And that a rack-mount 504
will not quite allow the oven door to close. LOL

While cleaning the mess out of the second 547 I received made by the
foam backing for the filter turning back to Texas crude, I scrubbed
and scrubbed with lacquer thinner. Then I fell to the patio from the
fumes. Never assume living through chemistry is better, even outside.

And once again, I learned that the description of an item on eBay,
and my description of it when I get it, represent two different
points of view. And that a $10 item never costs $10 by the time it
finally gets here to Canada.

Happy hunting!

Larry Christopher


Re: 453A

Greg Werstiuk <greg_werstiuk@...>
 

A humorous treatise on merkins and the definition and use thereof:

http://www.straightdope.com/classics/a3_232.html


Re: 453A

Don Black <jeans@...>
 

No..not one of those either :-)
Don -thickasabrick- Black.

David Wise wrote:

Because of the cosmopolitan nature of this group, one can never
tell if one's home slang will be understood. At the risk of spoiling
some subtle humor, I'll state the obvious:
"'merkin" is "American" pronounced with a particular accent.
A US citizen. That's all.
Best Regards,
Dave Wise ('merkin)

-----Original Message-----
From: Don Black [mailto:jeans@nex.net.au] Sent: Sat 8/7/2004 5:46 AM To: Rolynn PRECHTL K7DFW Cc: TekScopes@yahoogroups.com Subject: Re: [TekScopes] 453A



Oh... No, I'm not one of those ;-). Never cleaned a canon in my life.
Don Black.


Rolynn PRECHTL K7DFW wrote:

>>it's not in any lesser dictionary that I am aware of.
>> >>
>
>
>http://www.webster-dictionary.org/definition/merkin
>
>
>
>K7DFW
>
>
>
>
>Yahoo! Groups Links
>
>
>
>
>
>
> >









Yahoo! Groups Links








Re: 453A

Dave Wise
 

Because of the cosmopolitan nature of this group, one can never
tell if one's home slang will be understood. At the risk of spoiling
some subtle humor, I'll state the obvious:
"'merkin" is "American" pronounced with a particular accent.
A US citizen. That's all.

Best Regards,
Dave Wise ('merkin)

-----Original Message-----
From: Don Black [mailto:jeans@nex.net.au]
Sent: Sat 8/7/2004 5:46 AM
To: Rolynn PRECHTL K7DFW
Cc: TekScopes@yahoogroups.com
Subject: Re: [TekScopes] 453A



Oh... No, I'm not one of those ;-). Never cleaned a canon in my life.
Don Black.


Rolynn PRECHTL K7DFW wrote:

>>it's not in any lesser dictionary that I am aware of.
>>
>>
>
>
>http://www.webster-dictionary.org/definition/merkin
>
>
>
>K7DFW
>
>
>
>
>Yahoo! Groups Links
>
>
>
>
>
>
>
>



[Non-text portions of this message have been removed]



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Yahoo! Groups Links


Thanks! Re: Attenuator Woes

rollsroyce1_92394
 

Recently, I posted about attenuator problems I was seeing on my 485
due to a missing contact finger. I want to thank George Headley,
Deane Kidd, and Geoff Greer, who contacted me directly with parts
offers, suggestions, and support. With their assistance, my 485's
channel 2 is now as good as new. I also wanted to thank the other
members of this group, without whose constant sharing of "not in the
book" repair info, I would probably never have found the real cause.

Royce Hesley


Re: Tek 2465B Service Manual S/n above 50000

Don Black <jeans@...>
 

Hello Mervyn,
I've emailed the service manual to you. It's a large PDF file so I've split it over a couple of emails to keep the file size manageable. It doesn't have the schematics but includes a circuit description with diagrams so I hope it at least helps. Let me know if you get it OK, there might be a problem with your Yahoo account and large files.
Don Black.

mervynashton wrote:

Hi to all!
I am looking for a service manual that covers the later Tektronix 2465B models serial number B050000 and above. I have a copy of the manual that covers the older models.
This is to replace a copy that must have been accidently dumped....Sob!
Can anybody put me in the right direction??
I expect to pay for the information or copy.

Best wishes to you all.

Mervyn




Yahoo! Groups Links






Tek 2465B Service Manual S/n above 50000

mervynashton <mervynashton@...>
 

Hi to all!
I am looking for a service manual that covers the later Tektronix
2465B models serial number B050000 and above. I have a copy of the
manual that covers the older models.
This is to replace a copy that must have been accidently
dumped....Sob!
Can anybody put me in the right direction??

I expect to pay for the information or copy.

Best wishes to you all.

Mervyn


Re: Connectors, adaptors etc

Richard W. Solomon <w1ksz@...>
 

I find BAProducts.com to have a better selection and much better prices.

73, Dick, W1KSZ

ps: one good plug deserves another !!

-----Original Message-----
From: Craig Sawyers [mailto:c.sawyers@tech-enterprise.com]
Sent: Saturday, August 07, 2004 6:36 AM
To: TekScopes
Subject: [TekScopes] Connectors, adaptors etc


Let's just put it this way: any cable that can be terminated with
BNC or SMA
would give way long before connector becomes limiting item in
that assembly.
Incidentally, an eBay seller called testparts sells rf adaptors at pretty
decent prices. Just as an example, item 5714013511 is for five items, BNC
T, BNC-RCA, and three BNC-SMA at $19.95 on buy it now, or item 5714013497 is
four N-SMA adaptors for $15.

For some reason I have this guy's store in my favourites, so I must have
bought something from him at some stage.

Craig





Yahoo! Groups Links


Re: 453A

Don Black <jeans@...>
 

Oh... No, I'm not one of those ;-). Never cleaned a canon in my life.
Don Black.


Rolynn PRECHTL K7DFW wrote:

it's not in any lesser dictionary that I am aware of.


http://www.webster-dictionary.org/definition/merkin



K7DFW




Yahoo! Groups Links








Re: RF Connectors / Looking for N f-m adapter

maddisassembler
 

August 7th, 2004


Hello all,

very interesting posting from Brooke
especially on 'connector savers'.

This reminds me of my problem to
find a N-type male-female adapter
as a 'connector saver' for e.g.
expensive signal generators.

I know EMC-labs where equipment
with N-female outlets is used
so frequently with many daily
'screw-on/screw-off' cycles that
the equipment connector wears out
very quickly.

So far I could only find N male-male
or N female-female adapters so I first
have to screw N-f and N-m together to
get my connector saver.

Best regards
-Roland



--- In TekScopes@yahoogroups.com, Brooke Clarke <brooke@p...> wrote:
Hi:

Most of my career was spent in microwave engineering and 90+% of
that
with components using coax connectors.

The SMA connectors were designed to work with semirigid 0.141"
diameter
coax and used the coax center conductor for the male pin, so a
cable was
made up using a couple of male nuts whose shell was soldered onto
the
copper coax shield. The intent of this connector was that you
would
build up a system and then leave it alone. i.e. they are specified
for
a very small number of matings.

This was a problem later when we were making satellite hardware. I
often said that we supplied the hardware free, and only charged the
customer 1$ per page for the test data, which then was shipped in
cardboard boxes. The solution was to use "connector savers" which
is an
adapter SMA-m to SMA-f. A record was kept on each data sheet of
every
mating and after some number the connector saver was replaced. The
connector saver was rated for many more matings than was the base
connector.


Re: Digest Number 1190

Don Black <jeans@...>
 

I believe SMA connectors are rated to 18 G Hz.
Don Black.

phila_renewal wrote:

Oops -- a little more poking around and I see I got things
completely mixed up. N is spec'd. to 11 GHz; BNC to only 4. It's
the BNC that has the inherent low pass -- the N has "worse"
impedance matching due to the uncompensated inductance, but doesn't
have the low pass LC filter characteristics of the BNC (?).

So, in sum, BNC has better impedance matching to 4 GHz than the N,
but the BNC has the inherent LC low pass so things start to roll off
above 4 GHz with the BNC -- is that right? That being the case,
specify BNC or TNC for stuff below 4 GHz, and N above that?

Now, to add to the mix, what about the SMA?

Thanks again,
-Keith




--- In TekScopes@yahoogroups.com, Brooke Clarke <brooke@p...> wrote:


Hi Keith:

I think your data is wrong. The 50 Ohm N, BNC and TNC connectors

all


have identical I.D. and mating pins and sockets, the only

difference


between them is how they mechanically connect. If you hacksaw the
nut/connector from a male connector then you can plug it into any

of the


female connectors.

When H.P. introduced the first microwave network analyzer (8410) I

went


to an all day sales pitch and one of the demos was measuring the S
parameters of a 3 foot length of BNC cable to 12 GHz, and it

looked very


good.

A number of the HP network analyzers use a precision N connector

that's


rated to 18 GHz. Above 18 GHz, no matter how well made the

connector


you can get moding and so for higher frequencies you need to go to
smaller and smaller I.D. connectors.

Also the N connector is used because of it's mechanical strength

so hold


small test sets to the front of the instrument.

Have Fun,

Brooke Clarke, N6GCE

--
http://www.PRC68.com
http://www.pacificsites.com/~brooke/PRC68COM.shtml






Yahoo! Groups Links








Connectors, adaptors etc

Craig Sawyers <c.sawyers@...>
 

Let's just put it this way: any cable that can be terminated with
BNC or SMA
would give way long before connector becomes limiting item in
that assembly.
Incidentally, an eBay seller called testparts sells rf adaptors at pretty
decent prices. Just as an example, item 5714013511 is for five items, BNC
T, BNC-RCA, and three BNC-SMA at $19.95 on buy it now, or item 5714013497 is
four N-SMA adaptors for $15.

For some reason I have this guy's store in my favourites, so I must have
bought something from him at some stage.

Craig

178361 - 178380 of 186943