This is really Cool, thanks very much
:-)
?Regards,
?John
?
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email:?????
k5jhf@...photos:???
files:???????
webpage:?
callsign:???
K5JHF
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A very nice
readout. But for anyone wanting something *really* simple, have
a look at
my 2-chip binary readout counter
. Also see my BITX20 in the
G0UPL photos folder to see it installed in my
front panel.
My latest version is even simpler by using a 74HC390
instead of the
74HC4040, eliminating 5 diodes and 2 resistors from the
circuit. The output
is also easier to read: 2 columns of LED's indicating
80, 40, 20, 10 and 8,
4, 2, 1KHz. This is easier to add up than the binary
64, 32, 16, 8, 4, 2, 1,
0.5Khz of my earlier versions. The reading is 0 -
99KHz, my dial is marked
14.0, 14.1, 14.2, 14.3 and this is added to the
counter reading to get the
reception frequency. The 1KHz LED flickers such
that it's brightness can be
used to estimate the frequency inside the 1KHz
resolution.
Would anyone be interested if I were to offer a complete
kit of parts (for
ugly construction, i.e. no PCB), suitable for connection
to the BITX20 VFO
as in mine? The pack would include: 74HC4060, 74HC390, 5V
voltage regulator
+ filter, 8x 3mm high-brightness red LED's, single
transistor VFO buffer
amplifier, all diodes resistors and capacitors. Cost
?3.37 + postage (as
usual, parts cost only, no profits for poor G0UPL). If
enough people were
interested I could do this.
72/3 de Hans
G0UPL
-----Original Message-----
From: vk3bfa
[mailto:ablight@...]
Sent: 29 June 2004 01:56
To:
BITX20@...
Subject: [BITX20] Digital dial for BITX20 using
PIC
Hi fellow builders,
posting this link for information
-
its a digital frequency readout using a PIC micro with user definable
IF
offset - might be of use to the group, and I readily admit its
outside
Ashan's original inexpensive transceiver concept - it would
probably cost
more to build than the BITx20 itself! Still, I think its an
elegant
solution, so let me know what you think. Its .PDF, approx 162K in
size 73 de
VK3BFA Andrew
