Hi All,
?
Actually, I think that the Manhattan in the QRP
construction method really refers to the use of straight wires on a 90 degree
grid.?? At least that is where the term
originated.?????Typical integrated circuits use a
layout that follows a Manhattan format.? A recent reference is John Baliga,
"Chips Go Vertical," IEEE Spectrum, March, 2004,
pp43-47.????
?
I agree with Hans -- I have really seen no
difference between construction on a ground plane when using pads and building
without them, other than building without is
faster.????? There is rarely a need to go as high as
10M with the resistors if you don't have them around.?? Something much
smaller values will work just as well.
?
My son and I picked the term "ugly" on our 1981 QST
paper "The Ugly Weekender" for a specific reason:?? We wanted to
emphasize that there is no relationship between circuit performance and the
"pretty" nature of the construction, including that on a printed
board.?? In this case, it is the use of extensive ground plane that
makes the circuitry work well.
?
73, Wes
W7ZOI
?
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----- Original Message -----
Sent: Saturday, June 26, 2004 10:47
AM
Subject: Re: [BITX20] manhattan style
pads
Mark, Bruce et al
I don't think the difference
between "ugly" and "Manhatten" methods is all
that much.
My method
is a bit of a hybrid I suppose. Mostly ugly. But if I find a point
needs to
be better anchored I sometimes use a 10M resistor to ground (ok for
low
impedance signal points) or a .22uF capacitor to ground (ok for dc
voltage
points).
Sometimes I find I want pads. I mounted all the BITX20
inductors and
trifilar transformers on pads. But not nice circular pads
like in the copper
island construction kit. I just find scraps of PCB stock
and cut them up
into rough squares approximately 5mm x 5mm with a wire
cutter. They're ugly
but it works and takes literally seconds.
73
Hans G0UPL
-----Original
Message-----
From: Mark Jones
To:
BITX20@...
Sent: Sat Jun 26
16:39:19 2004
Subject: RE: [BITX20] manhattan style
pads
Bruce
I bought a "Copper island Construction Kit" but they
ceased trading a while
ago, I found someone (and I can't remember who or
find the e-mails) that
sent me some replacement (re-stock) pads via the
GQRP reflector. I just paid
the postage - a great deal and very helpful, he
said that a friend of his
was able to make them at work.
Sorry I
can't help more - I thought about making some but it was just
to
tricky.
Mark. G0MGX
-----Original Message-----
From:
nd8i [mailto:bruceraymond@...]
Sent: 26 June 2004 16:28
To:
BITX20@...
Subject: [BITX20] manhattan style
pads
I've been using ugly-style construction,
which has worked
quite well.? I've noticed
a bunch of constructors have used
Manhattan-
style construction.? Not being willing to
leave well
enough alone, I want to give it
a try.
Where do people get the
pads?? Or how does
one make them from blank pcb material??
I
suspect that trying to punch them out of
pcb material is a pretty slow
and tedious
process, so I suspect there must be a
better
alternative.
tia,
Bruce
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