Most of this V3 board is IF and BFO and as such is well shielded by
the prolific ground plane on it's single side.I like this type of
layout as it avoids a lot of ground loop problems.
To get up to 6 meters I would presume you are going to heterodyne
the signal and have the final on a separate CCA. The hetrodyne
oscillator and final can be seperately well shielded from the IF and
VFO otherwise you are going to have more trouble than a barrel full
of monkeys with all the signals mixing .
Best of luck
Jim VE3DDY
--- In BITX20@..., "ajparent1" <kb1gmx@a...> wrote:
Hi,
It's size and the lack of two sides (top ground plane) make it
less than useful for my 6m project. I'm saving it for something
else. I mentioned it so others may know that FAR has it.
Myself I'm dead bugging it [aka ugly or manhattan] style as its
fast and offers good grounding and shielding. I have PCB making
materials but for one off stuff it's as much time to setup and
do that is just building it dead bug style. Also much smaller.
FYI: I'm targeting a 175x45x130mm package. Power output will be
in the 3-5w range with 2SC1971 transistor. So I understand you
goal for containing in a manpack.
Allison
KB1GMX
--- In BITX20@..., "bambazonke01" <jimandruth@s...>
wrote:
The Far circuits boards are away too big for my application so
I'm
strongly considering a run of the CCA design by VU3WJM (Rahul).
This board design is 6.5 X 4.25 inches and will fit nicely
inside
the Chinese 884 VHF packset which you can buy off E-bay (Call
up "Military Radio")
I've recently relocated homes and will have to restock on G10
pcb
and resist etc.
Jim VE3DDY
--- In BITX20@..., "ajparent1" <kb1gmx@a...> wrote:
Hello,
This may not be of help to everyone but for North Americans
it would be handy to know.
FAR circuits www.farcircuits.net
They have the the BIT-X board as drawn by the creator.
The one I have measures 221mm by 82mm [8 11/16" by 3 1/4"
for the non metric]. At 19.00$US it's expensive but may
save construction time.
Allison,
KB1GMX
--- In BITX20@..., Rahul Srivastava <vu3wjm@y...>
wrote:
Hi! Friends
Unfortunately we have still not managed to get the BITX PCB
commercialy manufactured even though it is quite cheap getting
it
done
here.
Secondly postage from India is also rather expensive ie
much
more
than the board.
Board is correct in all respect except for one hole missing
for a
resistor but that anchors to nearby component lead. Ver3 is
quite
stable too. I would be happy if some DX friends can help out
in
this
matter to all those who need PCB. I will be happy to provide
any
needed file.
The modified filter response posted by one of our french
friend
does
indeed results in improved audio. I use 82,120&150pf caps as
standard
value.
I have yet to try swaping the PD/MOD connection mod.
Lately I came across another minimalist design. Less the uC
section
and brass screw PTO it becomes quite attractive
73
Raahul VU3WJM
bambazonke01 <jimandruth@s...> wrote:
Hi Arv, and Group,
I've been looking at the CCA Version 3 by VU3WJM as it fits
the
884
packset like a glove. I have to find someone who has that
board
available or else gear up to make my own. I've made some
PCB's
in
the past. I think Far Circuits may make me one as well.
You may have seen the 884 VHF packset being sold on e-bay
for
about
$120 Canadian or $100 US. These sets are good for 6 meter
FM
but
they are ideal to use for a rebuild in an HF packset.
I have al kinds of HF gear and "Green Radios" but always
enjoy a
project like this BitX.
As time goes on PCB problems will sort themselves out. In
the
meantime, I'll start collecting components.
Jim VE3DDY
--- In BITX20@..., Arv Evans <arvevans@e...>
wrote:
Jim VE3DDY
One of my BITX units is built on a 7 inch by 4 inch PCB,
including
the
PTO/VFO, a Huff & Puff stabilizer, and three additional
transistors for T/R
power switching. It is a bit tight, but it can be done.
Since
the RF stages
require shielding from the lower power sections, the use
of
vertical sections
of blank PCB might allow parts of the circuit to be built
on
these
shielding
partitions, thus allowing a more compact design.
PCBs have been designed and may still be available as well
if
you
prefer that
method of construction. Some of the PCB layouts are
documented in
the FILES
and PHOTO sections of the forum.
Some BITX builders have constructed the unit in several
smaller
modules (about
1 inch by 2 inches) that were then assembled to make up a
very
compact
layout.
By all means, read over the older email messages, then go
to
the
FILES and the
PHOTO sections and review what is there. You will find
several
additional
ideas for modification and upgrades.
Welcome aboard and good luck with your BITX. If you run
into
problems, there
are many now on the BITX forum that may be able to help.
Arv K7HKL
_._
On Thursday 11 August 2005 05:37 am, bambazonke01 wrote:
Hi BIT-X'ers,
My name is Jim and I'm new to the group.
I'm a Canadian Radio Amateur and an avid experimenter.
I have an old Chinese type 884 VHF radio packset into
which
I'd
like
to install a Bit-X perhaps for 40 Meters.
Has anyone reconfigured the main Bit-X PCB to a smaller
configuration
approx 170 X 110 mm (6.75 X 4.25 Inches)or smaller?
I also have similar size available for the VFO and PA
modules.
I've lots of reading to catch up on.
Jim VE3DDY
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