Dave VanHorn wrote:
You've got a big project there.
What is it exactly that you're looking to learn?
I need som good reference about passive filters. I have Eagleware Genesys
software, but everything i simulate i do not get so much usable results.
I'm asking, because you seem to want to take on a LOT of issues,
which may leave you broke and discouraged in the end.
I am working in on company on servicing receivers and transceivers. I
carefully choosed concept, and i have only problem with filters
(input, passive LC filters, vith varicap diodes for adjusting)
If I were you, I'd start off with a repeater controller, a relatively
straightforward firmware project with a little hardware interfacing.
I'd use existing radio hardware for that section.
As i said, i have something finished for PIC micro... In my company,
where i work, programmers use atmel, but it is all the same.
Then I might try my hand at a transmitter design, and learn just how
critical things are, and all the ways that a transmitter can get you
into trouble. :)
OK, i would send you schematic for transmitter, so u could give me advice
- did i or did i not designed it well...
Receiver design is another bunch of fun, and repeaters have some
issues that are especially important with regards to how large
undesired signals affect it.
I know that. I have finished 80% of receiver, only input filter (without
diplexer) is problematic also cna drop you schematic
I've done a simple repeater controller in an Atmel Tiny-11 ($0.25),
using only it's 32 registers and small rom. (no ram in this part)
Out of that I was able to get COR debounce, kerchunk filtering,
timeout timer, ID timer, hang timer, CWID (translating ASCII text in
rom to CW) and multitone courtesy beep. External hardware was a pot,
keying transistor, and a few R's and C's. I didn't even need a
crystal and caps since I was able to use the on-board R/C oscillator.
Personally, I avoid the PIC, it's internal architecture makes life
rather complicated, and it's a relatively slow machine.
Doesnt matter :)
I have some design already almost finished, so, why not use them...
I could use Tiny or Mega or any other Atmel, but i do not have need for
that...
If you'd like to see what CAN be done, have a look at the Arcom RC-
210 controller. This runs on an AVR Mega-128 part.
I planed to use 16F876 or 16F877 PIC...
Regards!
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