[Lowfer] BCY

[Jerry Picou]

Bill:
I'm looking over different oscillator circuits and I did come across the 
MPF102 . I just might go that route . I did a breadboard prototype of 
the 4011/4024 circuit and for some reason it doesn't work, even did it 
twice with same result, the 4011 works well , but the 4024 isn't 
operating, even changed out the 4024 with no luck. I am using the 4024B, 
which should be a direct replacement for the 4024, or at least according 
to my references. I will have to tinker with it some more. The 
oscillator with be inside a building, however it isn't heated a great deal.

Jerry

Bill Ashlock wrote:

> Jerry,
>
> I used to find the 4011 stability fairly descent, although, as of 
> late, I've been starting out with a separate MPF102 xtal oscillator 
> because I have more control over the feedback capacities and bias 
> currents which can have an effect on the temp coefficient and the long 
> term stability.  Are you planning to keep the exciter inside the 
> house?...... highly recommended.
>
> Good luck!
>
> Bill A
>
>
>> After checking the oscillators output on the exciter and found it not 
>> stable at all, I have decided to replace it. I obtained a schematic 
>> for the TM-1 transmitter and the model I have is different. The 
>> oscillator on the model I have uses three I/C's that are no longer 
>> available (or at least hard to find), but the schematic shows using a 
>> CMOS 4011 as the oscillator and a 4024 as a frequency divider. The 
>> circuit is very similar as shown in my 6th edition of the Low and 
>> Medium Frequency Radio Scrap Book.
>> Has anyone here or is anyone here using this circuit on their LF or 
>> MF transmitters.? and how stable is it. or would you recommend a 
>> different oscillator circuit.
>>
>> Thanks
>> Jerry
>>
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