The 567 makes a reliable tone decoder... but (there's
always a "but") the dectection bandwidth is really
kind of wide. Unless you're really good with the
spec sheets in your design... your circuit will detect
the ctcss tones on each side of the selected frequency.
If you're on a budget... you can also use the same
decoder (at the same time) for the encoder side if
you know how to "tap" the pll.
Yaesu used the 567 as the ctcss decoder in at least
one of their ham radios. Something like the Comm
Spec units are much better.
****
You're lucky to have had the 567 back in high school.
Harken back to my days of trouble to the classic
88mH telephone toroids and ge transistors for the
cutting edge.
cheers,
skipp
> I note the use of a 567 PLL IC for the CTCSS decode
> function. If you plan on using CTCSS access full
> time, I'd suggest replacing that circuit with a real
> CTCSS decode board. The 567s were fun to play with
> in my high school days, but they'll never equal the
> performance of a commercial CTCSS decoder.
> Bob NO6B
>
> [EMAIL PROTECTED] wrote:
>
> At 03:42 11/24/2005, you wrote:
>>Paul Finch wrote:
>>> Hello,
>>>
>>> Is there any other controllers in a kit form like
>>> the NHRC-4 that is in the same general price range?
>>> I need 10 controllers and on a tight budget.
> >
>> If you have the time to build your own PCB's and
>> program pic's, try VK5DJ's controller!
>>http://vk5dj.mountgambier.org/Repeater.html
>>
>
>http://users.picbasic.org/projects/Repeater/vk5dj_repeater_controller.htm
>
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