> Bob Dengler <[EMAIL PROTECTED]> wrote:
> The older Hamtronics RXs (~18 years ago?) have
> more serious issues. In particular, the squelch
> noise filter has very poor transient response &
> generates excessive output if "rung" by impulse
> noise. Ignition noise or possibly precipitation
> static would cause the squelch to behave as if it
> were tightened.
> Bob NO6B
The original Hamtronics circuit values were not
the best for their version of the MC3357 and/or
MC3359 ic layout. There were also issues of
unwanted on board oscillation based on how the
boards were constructed.
The above two ic chips are/were found in many a
scanner and two way radio circuits. I "lifted"
values from other circuits and tried various
combinations until I was happy with the result.
The older Motorola Data Book for Communication
IC's has data and suggestions for both the
mentioned chips.
cheers,
skipp
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/Repeater-Builder/
<*> To unsubscribe from this group, send an email to:
[EMAIL PROTECTED]
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/
