[Elecraft] 14.316 help!

[Don Nelson]

On 4/24/2011 3:37 PM, Jim Wiley wrote:
> David -
>
>
> No, the problem is not the crystal.  It is the  _oscillator_.  The
> oscillator is usually a more or less square-wave type, which is rich in
> harmonics.   These harmonics are then radiated by the circuitry in the
> offending device, and make their way to your station.
>
>
> The function of the crystal is to control (stabilize) the frequency on
> which the oscillator operates.   Color burst oscillator crystals are
> used so much because they are both inexpensive and easy to use.  They
> are inexpensive because literally hundreds of missions of them are
> manufactured.  For this reason, there have been created a large
> selection of  IC chips that use the color burst frequency as the primary
> timing function for whatever device into which they are incorporated.
> Many of these chips are very simple to use, in most cases requiring no
> components other a chip (manufactured specifically for the intended
> function) and the crystal itself to create the desired device.
>
>
> - Jim, KL7CC
>
>
>
> David Guernsey wrote:
>> I realize it is the 4th harmonic.  I do not have any problems with any harmonics
>> of 3579 KHz except the 14316 KHz (4th harmonic).  Thus, I wonder if the problem
>> is really from the color burst crystal.
>>
>>   73s de Dave KJ6CBS
>>
>>
>>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
A square wave is rich  in odd harmonics and essentially no even 
harmonics. So if the oscillator is putting out essentially a squared 
wave form, the fourth harmonic is going to be either non existent or 
many dB down. This thread suggests to me that the 14.316 MHz signal may 
be from some other source.

A bit off topic. I have a nasty 2304.150 MHz noise source that sounds 
digital. It comes and goes. What could it be coming from.

Don, N0YE