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B&K E-200D signal generator - no signal
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KENG
electronics forum beginner


Joined: 07 Jul 2006
Posts: 3

PostPosted: Sun Jul 09, 2006 10:50 pm    Post subject: Re: Adapting Astrocom headset - need U-94A/U plug and a little help Reply with quote

KENG wrote:
Quote:
Michael (Mickey) Sattler wrote:

Help please.

On behalf of a non-profit public service group I'm trying to adapt
military surplus Astrocom helicopter headsets to civilian uses, to be
used by ham radio users with Kenwood and Motorola handheld
transceivers.

To that end I believe what I need to do is get some U-94A/U plugs (with
built-in PTT) and the appropriate adapter (i.e. the Kenwood E11-0420-15
mic jack), figure out which wire is which, and solder away. I don't
believe that I need any capacitor with the PTT switch, but if you know
better I'd love to hear all about it.

I'm having trouble sourcing the U-94A/U, so I'd like some help on that
too.

Many thanks from all of you,

Mickey

Mickey,
Back in the olden days, I was a Comm Tech in the USAF. One of my
accomplishments was designing a mod for C-12 aircraft (Civilian Beech
Queen Air), which used the non-mil Headset/Microphones. The aircrews
wanted to use H-157 Headset ($57.00, and available on every USAF base in
the world) instead of special order David Clark Headsets at a cost of
over $300.00 at that time. There is a audio transformer that was
specified in one of the radio test sets to do just what you want. It
even was pre-wired with a U-92/U on one end. You would need to add the
connectors for H/S and Mic to the attached cable. The transformer is
MX-!#^*%/ARC. This worked great for the crews, and I was awarded a
substantial sum for the suggestion/proposal. The aircrews did not
want/need the PTT feature you are wanting. I will search through my
papers for the exact part number of the transformer. FYI, the
transformer is housed in a cylindrical can about 1.5" by 4" with 2
cables attached, one cable has a U-92A/U attached, the other has no
termination.

KenG
Mickey,

As a followup to this post, the adapter/transformer is MX-1646/AIC.
Link To Specs
http://www.dscc.dla.mil/Downloads/MilSpec/Docs/MIL-DTL-8416/dtl8416.pdf

KenG
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Ken Gremillion
electronics forum beginner


Joined: 09 Jul 2006
Posts: 2

PostPosted: Sun Jul 09, 2006 11:05 pm    Post subject: Re: Adapting Astrocom headset - need U-94A/U plug and a little help Reply with quote

KENG wrote:

Quote:
KENG wrote:

Michael (Mickey) Sattler wrote:

Help please.

On behalf of a non-profit public service group I'm trying to adapt
military surplus Astrocom helicopter headsets to civilian uses, to be
used by ham radio users with Kenwood and Motorola handheld
transceivers.

To that end I believe what I need to do is get some U-94A/U plugs (with
built-in PTT) and the appropriate adapter (i.e. the Kenwood E11-0420-15
mic jack), figure out which wire is which, and solder away. I don't
believe that I need any capacitor with the PTT switch, but if you know
better I'd love to hear all about it.

I'm having trouble sourcing the U-94A/U, so I'd like some help on that
too.

Many thanks from all of you,

Mickey

Mickey,
Back in the olden days, I was a Comm Tech in the USAF. One of my
accomplishments was designing a mod for C-12 aircraft (Civilian Beech
Queen Air), which used the non-mil Headset/Microphones. The aircrews
wanted to use H-157 Headset ($57.00, and available on every USAF base
in the world) instead of special order David Clark Headsets at a cost
of over $300.00 at that time. There is a audio transformer that was
specified in one of the radio test sets to do just what you want. It
even was pre-wired with a U-92/U on one end. You would need to add
the connectors for H/S and Mic to the attached cable. The
transformer is MX-!#^*%/ARC. This worked great for the crews, and I
was awarded a substantial sum for the suggestion/proposal. The
aircrews did not want/need the PTT feature you are wanting. I will
search through my papers for the exact part number of the
transformer. FYI, the transformer is housed in a cylindrical can
about 1.5" by 4" with 2 cables attached, one cable has a U-92A/U
attached, the other has no termination.

KenG

Mickey,
As a followup to this post, the adapter/transformer is MX-1646/AIC.
Link To Specs
http://www.dscc.dla.mil/Downloads/MilSpec/Docs/MIL-DTL-8416/dtl8416.pdf

One for sale here...
http://www.bpbsurplus.com/lc/cart.php?target=product&product_id=16496&category_id=296

Quote:

KenG
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KENG
electronics forum beginner


Joined: 07 Jul 2006
Posts: 3

PostPosted: Sun Jul 09, 2006 11:09 pm    Post subject: Re: Adapting Astrocom headset - need U-94A/U plug and a little help Reply with quote

KENG wrote:
Quote:
Michael (Mickey) Sattler wrote:

Help please.

On behalf of a non-profit public service group I'm trying to adapt
military surplus Astrocom helicopter headsets to civilian uses, to be
used by ham radio users with Kenwood and Motorola handheld
transceivers.

To that end I believe what I need to do is get some U-94A/U plugs (with
built-in PTT) and the appropriate adapter (i.e. the Kenwood E11-0420-15
mic jack), figure out which wire is which, and solder away. I don't
believe that I need any capacitor with the PTT switch, but if you know
better I'd love to hear all about it.

I'm having trouble sourcing the U-94A/U, so I'd like some help on that
too.

Many thanks from all of you,

Mickey

Mickey,
Back in the olden days, I was a Comm Tech in the USAF. One of my
accomplishments was designing a mod for C-12 aircraft (Civilian Beech
Queen Air), which used the non-mil Headset/Microphones. The aircrews
wanted to use H-157 Headset ($57.00, and available on every USAF base in
the world) instead of special order David Clark Headsets at a cost of
over $300.00 at that time. There is a audio transformer that was
specified in one of the radio test sets to do just what you want. It
even was pre-wired with a U-92/U on one end. You would need to add the
connectors for H/S and Mic to the attached cable. The transformer is
MX-!#^*%/ARC. This worked great for the crews, and I was awarded a
substantial sum for the suggestion/proposal. The aircrews did not
want/need the PTT feature you are wanting. I will search through my
papers for the exact part number of the transformer. FYI, the
transformer is housed in a cylindrical can about 1.5" by 4" with 2
cables attached, one cable has a U-92A/U attached, the other has no
termination.

KenG
Mickey

Mickey,
As a followup to this post, the adapter/transformer is MX-1646/AIC.
Link To Specs
http://www.dscc.dla.mil/Downloads/MilSpec/Docs/MIL-DTL-8416/dtl8416.pdf

Here's one for sale:
http://www.bpbsurplus.com/lc/cart.php?target=product&product_id=16496&category_id=296
KenG
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Ken Gremillion
electronics forum beginner


Joined: 09 Jul 2006
Posts: 2

PostPosted: Sun Jul 09, 2006 11:14 pm    Post subject: Re: Adapting Astrocom headset - need U-94A/U plug and a little help Reply with quote

Mickey,
As a followup to this post, the adapter/transformer is MX-1646/AIC.
Link To Specs
http://www.dscc.dla.mil/Downloads/MilSpec/Docs/MIL-DTL-8416/dtl8416.pdf

One for sale here...
http://www.bpbsurplus.com/lc/cart.php?target=product&product_id=16496&category_id=296


KenG
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Mike
electronics forum Guru Wannabe


Joined: 22 Oct 2005
Posts: 102

PostPosted: Mon Jul 10, 2006 12:44 am    Post subject: Re: Tektronix 3001GPX Power supply info needed Reply with quote

Wallace Owen wrote:

Quote:
I've got a Tektronix 3001GPX, whose power supply* has bit the dust. The
company that made it is out of business.

I need to find out it's specs so I can rig up a replacement. Does anyone:

o Have an old SSI Power Supply catalog (Circa 1993) with an entry for
model 30-008-0001 REV 14

o Have service manuals for a Tektronix 3001GPX Logic Analyzer

o Have a dead 3001GPX with a non-dead power supply


// Wally Owen, tinkerer

*Power Supply estimated specs: +5V at maybe 20A, +-12 all with common
returns, with enough current on the -12 to supply power to some ECL
circuitry, and an isolated 12V with it's own return, to power the analog
circuitry.


You can go to the Tektronix web homepage and sign up for mytek (follow the
link). This will give you access to the manual downloads. The big problem
is the MCU service manual is missing the schematics, but it still has very
useful information including power supply troubleshooting. The 3001 service
manual has some schematics. Just use the mytek manual search to locate the
3001 and MPU manuals. Unfortunately the only other PRISM on-line manual I
have been able to find is a special fixture manual.

070-7413-03: 671-0058-XX MPU Board (missing all schematics)
070-6676-01: PRISM 3001 and 2505 TestLab (has some schematics)

The PRISM power supply has a complex start up sequence that involves things
like temperature sensors on the remote boards. You can hear a relay engage
when you plug the 3001GPX into its AC power source and part of the MCU
board will run off a special supply voltage without powering up the main
power supply. When you flip the main power switch (a 12 volt DC rated
switch) from Standby to On, all you are doing is asking the MCU logic board
to consider powering up the analyzer. If the MCU board decides to power up
you will hear a relay click to power up the main power supply, the noisy 12
volt fan will come to life and it will boot up. You may not actually have a
bad power supply. There may be other problems that prevent the MCU board
from issuing the start up sequence. At least one of the relays is still
manufactured, but the 070-6676-01 manual parts list miss-identifies the
coil voltage as 120 VAC while the manufacturer part number indicates its
really a 12 volt DC coil. Without the MCU board schematics I have no way to
tell what might go wrong with the power startup.

Please let me know if you find a source for the MCU schematics as I am
looking for them. My 3001GPX does not always power up, but it works fine
after it finally does.

Beware, I have seen eBAY auctions that try to sell CD versions of the FREE
on-line manual PDFs.

I have identified the Tek part numbers for these manuals, but have not found
the actual manuals yet.
070-6672-04: 3001 SYSTEM, User's manual
070-8465-00: 32GPX, User's manual

There is also a 32GPX Acquisition Module Service manual that I have no part
number for.

Mike B
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BYTES
electronics forum beginner


Joined: 10 Jul 2006
Posts: 1

PostPosted: Mon Jul 10, 2006 5:05 pm    Post subject: Re: HP LJ 5 replacement fan? Reply with quote

Sorry for bumping an old thread, but I came across this forum while
doing a google search for a Laserjet 5 NMB fan with the part #
3610ML-05W-B39. I refused to pay $40-120 for this fan, so I bought a
brand new Thermaltake 9025A-2B double ball bearing fan for $6. I
removed both new bearings from the Thermaltake fan and swapped them out
with the defective bearings in the NMB fan. The NMB is good as new now.
:)

I hope this post is able to help others out in the future.




--
BYTES
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Jason D.
electronics forum Guru Wannabe


Joined: 06 May 2005
Posts: 196

PostPosted: Wed Jul 12, 2006 12:53 pm    Post subject: Re: Help, any gurus with alternator experience or knowledge? Reply with quote

Please cut to one newsgroup forum, you're cross posting to many
newgroups. Thanks.

Reason those wires breaking off is that crankshaft have firing
impulses on the crank, even with flywheel and damper crankshaft still
vibrate in rotation plane. Whack whack whack, those poor wires from
the winding to the slip rings vibrating like twanged bow string and
evenually come apart.

Is the winding throughly SECURE? Also you may want to redesign the
eyelets to be MORE close to the winding. Always fabric sleeve these
flying wires and use cotton twine wetted with varnish and bed it then
lay the wires across it and bury the wires with more twine. Let set.
This is what old school motors were done this way to stop wires from
vibrating.

Especially look at the old vacuum motors, They had to be built to
survive 10,000 rpm from dead stop, same with engine starters.

Cheers, Wizard
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default
electronics forum Guru Wannabe


Joined: 03 May 2005
Posts: 175

PostPosted: Wed Jul 12, 2006 3:20 pm    Post subject: Re: Help, any gurus with alternator experience or knowledge? Reply with quote

On Wed, 12 Jul 2006 12:53:08 GMT, depotcon@kos.net (Jason D.) wrote:

Quote:
Please cut to one newsgroup forum, you're cross posting to many
newgroups. Thanks.
Yeah was hoping to find a person who's done a rewind himself. The

repair group is too busy, figured I'd drop off the screen in a day or
two.
Quote:

Reason those wires breaking off is that crankshaft have firing
impulses on the crank, even with flywheel and damper crankshaft still
vibrate in rotation plane. Whack whack whack, those poor wires from
the winding to the slip rings vibrating like twanged bow string and
evenually come apart.

My latest plan is to try a self-supporting coil. I found some 22

gauge wire I could afford. Rather than make a bobbin, I put some
polyethylene facings to my mandrel and plan to spray it with silicone
as a mold release agent. I'm serving some small braided wire to the
ends of the magnet wire and bringing those up through fabric sleeves
and anchoring the ends in wraps of cotton twine.

Quote:
Is the winding throughly SECURE? Also you may want to redesign the
eyelets to be MORE close to the winding. Always fabric sleeve these
flying wires and use cotton twine wetted with varnish and bed it then
lay the wires across it and bury the wires with more twine. Let set.
This is what old school motors were done this way to stop wires from
vibrating.

I'm using the same epoxy that worked last time for this winding. The
stuff I ordered didn't get here and won't until Friday. I may still
do a second coil with vinyl ester resin since I have more than enough
wire now.

There's no doubt the wire and sleeves I used were anchored well enough
the last time - but I think it was a mistake to use Teflon sleeves -
the wire had about .5 millimeter of play in the sleeve and it was 1.5
centimeters long embedded in epoxy - but epoxy can't penetrate the
sleeve.

Fabric sleeve (called spaghetti in the repair trade here) has been
supplanted with Teflon and heat-shrink tubing. I have some Military
type, small diameter (2.5mm), silver plated coaxial cable with a
fabric braid. Probably used for airframe applications from sensors to
cockpit. I'm using the braid and fabric and discarding the Teflon
center conductor.

Quote:

Especially look at the old vacuum motors, They had to be built to
survive 10,000 rpm from dead stop, same with engine starters.

Cheers, Wizard


Thanks for the ideas

----== Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet News==----
http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups
----= East and West-Coast Server Farms - Total Privacy via Encryption =----
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Michael A. Terrell
electronics forum Guru


Joined: 24 Mar 2005
Posts: 2291

PostPosted: Wed Jul 12, 2006 6:31 pm    Post subject: abuse@ish.de Reply with quote

"http://4onemillion.blogspot.com/" wrote:


Spam. Report it with full headers to: abuse@ish.de


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida
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Robert Kennett
electronics forum beginner


Joined: 12 Jul 2006
Posts: 2

PostPosted: Wed Jul 12, 2006 10:45 pm    Post subject: Re: Do failing LEDs flicker? Reply with quote

Fred-

Your concern about LED's flickering:

Fred Mann Wrote:
Quote:
Hello,
I have a piece of audio gear which has an illuminated power switch. The
LED
inside flickers. Should I replace the LED, or is something else at
play
here? I was under the impression (for no good reason) that LEDs are
like
light bulbs - either they work or they don't -- no flickering.
Thanks!!
Fred

Is valid. LEDs do not flicker unless the applied voltage varies. They
can be used to transmit information via light to another device at high
frequency, or can remain on steadily without any variation in intensity
for years.

Check the applied voltage with a meter, and check the connections.
LED's are Solid State devices (Light Emitting Diode). I have never come
across an intermittent one. They will fail open or shorted if subjected
to conditions outside of normal, such as high temperature and voltage
spikes. It's possibly a problem with the switch innards.

It's possible that you have a neon pilot light in that switch? They
will flicker at end of useful life.


RKic




--
Robert Kennett
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mvdeede3
electronics forum beginner


Joined: 13 Jul 2006
Posts: 1

PostPosted: Thu Jul 13, 2006 11:22 am    Post subject: Re: teletech tv Reply with quote

hello Friends,
I have the same problem with an identically television.( chassis
11AAK30A4)
I think to change the IC MC44608P40. Do you remember the solution of the
problem?
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David McDivitt
electronics forum beginner


Joined: 14 Jul 2006
Posts: 9

PostPosted: Fri Jul 14, 2006 9:29 pm    Post subject: Re: speaker freq response Reply with quote

Quote:
From: "David" <someone@some-where.com
Date: Fri, 14 Jul 2006 21:14:25 GMT
Lines: 28


(snip)
Easiest way is to add a resistor in series with each tweeter. Something
about 8 ohm 5 watt should be a good start

True. I used "attenuate" inappropriately. Using resistors would mean I'd
have to dismantle the speakers, or make the job overly complex. I paid $69
for the pair at Walmart and I don't want to screw them up. Seems if I put
a
very small inductor in series, it would lower the frequency response. The
effect of the inductor would be more pronounced the higher the frequency,
and less the lower the frequency, such that the difference to bass would
be
insignificant, but on the top end it would do what I want.

I just need a value for an inductor.

--
dgm

Do a little math. XL=2*pi*f*L.

Set XL to 8 ohms or so, pick a frequency (f) and calculate L. The complete
equation for a voltage divider is quite simple as well. Just remember XL is
on the imaginary axis in the complex plane.

That will give me a starting point. Thanks

--
dgm
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Jim Land
electronics forum beginner


Joined: 06 Jun 2006
Posts: 46

PostPosted: Fri Jul 14, 2006 10:49 pm    Post subject: Re: HUGE LOT 8-TRACK DECKS-RECORDERS- CLEANING CARTRIDGES- TAPES- BY ARTIST-COMEDY- ROCK-POP-EZ LISTENING-CLASSICAL-C&W- DISCO- VOCALIST Reply with quote

"CAINE" <bb69@epix.net> wrote in news:1152878967.518460.192880@
35g2000cwc.googlegroups.com:

Quote:

http://search.ebay.com/_W0QQfgtpZ1QQfrppZ25QQsassZ66fourdoor

CONCORD QUADRAPHONIC/STEREO 8-TRACK DECK-AC MOTOR-testd - $24.99
Not specified 2d 13h 58m
[snip]

Try news:rec.antiques.radio+phono
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Michael A. Terrell
electronics forum Guru


Joined: 24 Mar 2005
Posts: 2291

PostPosted: Sat Jul 15, 2006 1:38 am    Post subject: Re: HUGE LOT 8-TRACK DECKS-RECORDERS- CLEANING CARTRIDGES- TAPES- BY ARTIST-COMEDY- ROCK-POP-EZ LISTENING-CLASSICAL-C&W- DISCO- VOCALIST Reply with quote

Jim Land wrote:
Quote:

Try news:rec.antiques.radio+phono


He already spams that group enough, thank you.


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida
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Barry & Nikki
electronics forum beginner


Joined: 19 May 2005
Posts: 34

PostPosted: Sat Jul 15, 2006 1:58 am    Post subject: Re: NEED: These Toshiba Transistors Reply with quote

ALWAYS at least one dipshit rises from a pile of fecal matter. I'm fully
aware of these being available at most any on-line supplier. I don't need
mass quantities of them thus it is not worth paying 20 times the worth of
the item to cover shipping that suppliers want. What ever happened to this
site being a place to help one another out? You know the good ol' fashion
TRADE activity that use to take place... Oh that's right punk ass kids
learned how to use a computer and are use to everything just being handed to
them. Amazing!!!!!



"kip" <nospam@nospam.com> wrote in message
news:newscache$4vfe2j$7zc$1@newsfeed.niagara.com...
Quote:
What do you think this is ?? a Store ??
These are common and available at most supply houses ...do a search.


electronicabills@msn.com> wrote in message
news:1152886841.514346.94980@p79g2000cwp.googlegroups.com...

Barry & Nikki wrote:
Toshiba:
2SA1837
2SC3181N
2SA1264N
2SC4793

Please email me with the price per each and shipping within the U.S.A.
to
zip 98236. Thanks in advance to anyone who can offer these.

Visit www.electronica-usa.com
you will get original devises


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Google

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