Done it in the before - Yes
Done it in the basement / last 2 years - Yes
Set up to do it in the basement - Yes (bedroom, no basement)
Would I buy one - done that before.  Yes
Would actually do it in a reasonable amount of time - Yes

Hi

Any part of the home is fine.

All I'm trying to rule out is "take it to work and have them do it" and
"take it to work and build it with their gear". Those might be unreasonable
constraints. There may be places that are fine with you using their reflow
oven and solder screen gear to make home projects. If so - sorry for ruling
somebody with a kind employer out.

Bob

-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On
Behalf Of David VanHorn
Sent: Friday, March 25, 2011 2:16 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Parts Selection

Done it in the before - Yes
Done it in the basement / last 2 years - Yes
Set up to do it in the basement - Yes (bedroom, no basement)
Would I buy one - done that before.  Yes
Would actually do it in a reasonable amount of time - Yes

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Hi Bob,
Have done it at home and work
Am set up at home
Would do it (have done smaller)
 
Robert G8RPI.
 
--- On Fri, 25/3/11, Bob Camp lists@rtty.us wrote:

From: Bob Camp lists@rtty.us
Subject: [time-nuts] Parts Selection
To: "'Discussion of precise time and frequency measurement'" time-nuts@febo.com
Date: Friday, 25 March, 2011, 17:07

Hi

Just a show of hands sort of thing. It comes up each time we talk about
projects and never really gets answered. Rather than trying to work it out
as a part of a project, let's see if it can be addressed by it's self.

How many people are willing to solder up a project with multiple 0.5mm
spacing >=144 pin package IC's on it? There's a typical package drawing at
the end of:

http://www.national.com/ds/DP/DP83816EX.pdf

I'm sure it's a "what's in it for me?" sort of question. Let's assume it's
just neat piece of bench gear rather than a home grown cesium standard for
$100.

I don't think this part really matters, but it might to some people. Say
each chip is well below $100, but above $20 each. There might be only one
part like this on some projects, but for the sake of this poll, let's say
there are two or three of them. Net is roughly 250 to 500 pins like this to
solder, on some number of packages. It's part of a project that will cost
you $250 to $500.

I'm not talking about opinions on weather it can or can't be done. It
certainly can be done and is done every day. What I'm asking is - would you
buy a bag with the parts all in it? If you do are you going to put it
together in a reasonable amount of time?  Reasonable time might mean
different things to different people. For the sake of completeness, yes you
also need to get it working after you assemble it.

Next layer (you knew there had to be more) - have you done it before
(anywhere)? / done it in the last 2 years (at home)? / are you set up to do
it today (at home)?

I'm not trying to get into "how would you do it / what would you need /
could you farm it out". Those are also neat questions, but not part of this.

I'll start off the voting (and yes the answers are out of order):

Done it in the before - yes.

Done it in the basement / last 2 years - no.

Set up to do it in the basement - yes, but not set up well.

Would I buy one - done that before. Likely would again. (counts as a yes).

Would actually do it in a reasonable amount of time - unlikely.  (That
counts as a no).

Any more votes?

Bob

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Hi -

New to the list as of last night - much more activity than I expected.
As an introduction, my name I Brent, and I work mostly in the subsea
world, although prior to that, in the RF/microwave test equipment
world.

I expected to lurk for a good 6 months before chiming in, but what the heck.

Done it before: yes
Done it in the last 2 years: yes
Setup to do it in the basement:  yes, in a hack sort of way
Would I bye one?  No
Would do in a reasonable amount of time:  No.

Not to confuse the issue, but the "No's" at the end are because of my
doubts in what can be accomplished given the limitations of my own
skills (which are not bad) and the limitations on the design imposed
by that.  Hand soldering chips is doable, but you are limiting the
design to not having any BGA's, which I think is unrealistic in
today's world and still expect a decent level of performance.  Many of
the chips I work with today aren't offered in anything but BGA's.  To
me, there'd be a lot more value in putting people's algorithm and
coding skills to use (of which, mine aren't so good).  Design a robust
platform based on an FPGA, get a group buy together and get the thing
built in a real board house.  Spend the effort in developing a high
quality/high feature system that is built on sound and reproducable
hardware.  The GNU radio project and others come to mind.

Then I might be interested..

Hope I didn't detract from/dustract the conversation.  Many thanks in
advance for the good information I have already gathered and will
certainly gather in the future.

Best Regards,

Brent
KD4VMM

Done it in the before - yes.

Done it in the home lab / last 2 years - yes.

Set up to do it in the home lab - yes.

Would I buy one - yes.

Would actually do it in a reasonable amount of time - Yes
A weekend or two.

--- Graham / KE9H