KX170B replacement options

That's cheap and easily fixable: as long as you
can get them to fix it or give you the info to do so yourself. Ribbon
cables aren't
chafe-protected,

Chafe-protected against what?


non-gold-plated connectors

Tin on tin is every bit as good as gold on gold in the avionics environment.


cheesy DIP sockets for many ICs, etc.

What does a non-cheesy DIP socket look like? And why in the world would you
ever socket an IC?



If you look inside a King unit, they're built to avionics standards... not
cheapo consumer VCR standards.

How many devices have you built and marketed to avionics standards? And
where are these standards posted or documented?


-Cory

You've been a grad student now for about four years as I count. Ever plan
on finishing up?


Jim


--

************************************************** ***********************
* Cory Papenfuss *
* Electrical Engineering candidate Ph.D. graduate student *
* Virginia Polytechnic Institute and State University *
************************************************** ***********************

: Chafe-protected against what?

Wire on metal inside the radio. They're not tied down to anything and are
free to flap against other parts inside the radio.

: Tin on tin is every bit as good as gold on gold in the avionics environment.

OK. Sure.... and the crappy little consumer-grade EGT/CHT switches that came
with my multi-cylinder aren't actually exhibiting poor contact resistance already
after only 2.5 years either. I'm not buying it... There *IS* a reason for MIL-SPEC
components.

: What does a non-cheesy DIP socket look like? And why in the world would you
: ever socket an IC?

As you well know, there are high-quality sockets and low-quality sockets. One
wouldn't think that socketing ICs are too necessary, yet the Michel radios had them.

: How many devices have you built and marketed to avionics standards? And
: where are these standards posted or documented?

A personal attack? I would expect more. To answer the question though,
absolutely zero devices have been marketed. I've designed a few ( 5 ) to go on
experimental research rocket payloads. I have designed a number of circuits for use
in an automotive environment for a hybrid electric research vehicle ( 10 ). I have
repaired even more on the same project due to crappy construction quality of circuits
designed by previous people similar to what I've seen in Michel units. I have been
involved with designing and building electrical power electronic circuits switching
over 50kW and have seen the ramification of ill-constructed circuitry. I have been
inside a number of King, Narco, Dave Clark, and Michel avionics and the Michel units
are sub-standard in construction quality by comparison.

: You've been a grad student now for about four years as I count. Ever plan
: on finishing up?

No. I enjoy keeping an open mind and continually learning about as much as I
possibly can. I will never finish being a "student."

-Cory

--

************************************************** ***********************
* Cory Papenfuss *
* Electrical Engineering candidate Ph.D. graduate student *
* Virginia Polytechnic Institute and State University *
************************************************** ***********************

"RST Engineering" wrote in message
.. .
non-gold-plated connectors

Tin on tin is every bit as good as gold on gold in the avionics environment.

I respect your background, and I am not an avionics engineer (and do not
play one on TV) but this is directly opposite to my experience. I will never
bother with a non-gold card edge connector again.

cheesy DIP sockets for many ICs, etc.


What does a non-cheesy DIP socket look like?

I have had grief with cheap IC sockets. The difference can be pennies per
unit.

And why in the world would you ever socket an IC?

Here, we agree.


You've been a grad student now for about four years as I count. Ever plan on
finishing up?

I spent at least 4 years on my Master's, given that life continued to go on
and I still needed a job to feed my family. The Ph.D (if I had continued) would
have taken longer.


Vaughn

"Vaughn" writes:



And why in the world would you ever socket an IC?

Here, we agree.

You socket the IC where your evaluation tells you it's necessity
for replacement overcomes the added issues with a socket.

I designed my boards with the vulnerable IC's in GOOD, gold-plated
sockets. I can't recall the brand now; but they were circular
concentric pins held in a strip of plastic. Not cheap.

The vulnerable ones to me were those that interfaced OFF the board,
to the real world. They took the abuse & died for the cause every
so often. YMMV.

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