Look at the vco control voltage with a scope. Say it is slammed against a rail
high or ground. This means the reference divider or the divide by N are not set
up properly.
If it is oscillating then the filter is wrong. surf old motorola for special
functions for applications information. The applications will tell you how to
determine the constants you need. Usually you set the filter corner frequency
at 1/10 the reference into the phase detector for starters. I did a 145152 in
my homebrew rx. fc
Frank <[EMAIL PROTECTED]> wrote:
Hello,
I would like some generic rule of thumb rules for a MC141515 single modulus PLL
using a simple 1st order RC filter. The datasheet gives the bandwidth of the
loop as a
function of the other parameters, but I don't know what it should be. How much
bandwidth is enough, all I know is that my circuit does not lock? In reality,
for an RC
filter I need to know these values as a function of all the rest (Kphase, Kvco,
N).
Any advice, to teach me to fish please?
Frank
[Non-text portions of this message have been removed]
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/soft_radio/
<*> Your email settings:
Individual Email | Traditional
<*> To change settings online go to:
http://groups.yahoo.com/group/soft_radio/join
(Yahoo! ID required)
<*> To change settings via email:
mailto:[EMAIL PROTECTED]
mailto:[EMAIL PROTECTED]
<*> 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/
