Re: Digital dial for BITX20 using PIC

Hans Summers <Hans.Summers@...>

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

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