in the other thread about this i read that changes to the 1k and 10k pots on the 4046 changes the vco in there. maybe slap pots on them for adjustment purposes?
Those pots deserve to be slapped.
like a prom date or redheaded stepchild?
What are the part numbers of the ICs you used?
I used the 74HC series which are fast enough and work up to at least 2.5 MHz with no problems.
Neil
hfc40103BE, cd4046be, cd4060be
Your original suspicion about the chips may be correct. The data sheet for the CD4046 shows a typical frequency limit for this chip of 600 to 800 kHz at 5 volts and 1.2 MHz for 10 volts. The frequencies of the upper broadcast band will be higher than the IC is specified to operate.
I know that the 74HC series chips works but the supply is limited to 5 volts. Unfortunately, the next step appears to be to replace your ICs.
Neil
i can raise the voltage source on it according to this datasheet. will 13.8 volts mess it up?
The data sheet for the PLL chip is here:
http://www.datasheetcatalog.com/datasheets_pdf/C/D/4/0/CD4046BE.shtml
It will operate at 15 volts and your circuit may work at this voltage but the best approach would be to replace the chips with the 74HC series and operate the circuit at 5V.
I was able to purchase the chips at Mouser about a year ago for not too much money.
Neil
my gameplan was to change the 10k to a 5k and take the V+ lead from that one chip and put it on 13.8v. i have around 10 of these CD chips so it totally is within my interest to figure this out
You could try that but the digital inputs for this chip coming from the other chips may not be high enough in voltage to be seen as a logic 1.
If you change the voltage to the whole circuit to 13.8V or so there might be a concern with overdriving and damaging the crystal.
Just some things to watch out for.
Neil