[Lowfer] BCY

Wed, 19 Nov 2003 22:35:53 -0500

Jerry

>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 comments on the frequency limitations of these counters must explain 
your problem. I recall now that all my applications were for xtal 
frequencies below 5 MHz.

>The oscillator with be inside a building, however it isn't heated a great 
>deal.

Hope you can keep the temp range within 10F degrees.

Bill A

>>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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>>
>>
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>
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_________________________________________________________________
Groove on the latest from the hot new rock groups!  Get downloads, videos, 
and more here.  http://special.msn.com/entertainment/wiredformusic.armx