[Drake] 2-NT VFO Choice

[D C _Mac_ Macdonald]

A possible, but more expensive, real solution to this problem would 
be to insert one of the bandpass filters that are commonly used for 
multi-transmitter Field Day sites to eliminate both harmonic and any 
"sub-harmonic" signals from even reaching the 2-NT transmitter ! 
  
* * * * * * * * * * * 
* 73 - Mac, K2GKK/5 * 
* (Since 30 Nov 53) * 
* Oklahoma City, OK * 
* USAF, Ret'd 61-81 * 
** FAA, Ret'd 94-10 * 
* * * * * * * * * * * 
 
 

> Date: Mon, 29 Feb 2016 15:46:53 +0000
> To: af4k at hotmail.com; dennis.monticelli at gmail.com; drake at mailman.qth.net
> Subject: Re: [Drake] 2-NT VFO Choice
> From: drake at mailman.qth.net
> 
> Low pass filter won't work in this case.  He is talking about signals lower in frequency than the desired output frequency.
> 
> 
> For example, a number of VFOs use the 160-meter range for 80-meters and even for 40-meters.  For a frequency of 7100 kHz the VFO operates on 1775 kHz and there can easily be signals at 1775 kHz, 3550 kHz, 5325 kHz, and the desired 7100 kHz.  
> 
> 
> With the VFO output in the 40-meter band, when used for 20-meters, 15-meters, and 10-meters, as the band goes higher in frequency there are additional signals.  By the time one gets to the 10-meter band, say a frequency of 28.100 MHz, there are signals at the VFO fundamental of 7.025 MHz, 14.050 MHz, 21.075 MHz, and the desired 28.100 MHz.
> 
>  Glen, K9STH 
> Website: http://k9sth.net
> 
>       From: Bry Carling <af4k at hotmail.com>
>  To: Dennis Monticelli <dennis.monticelli at gmail.com>; "drake at mailman.qth.net" <drake at mailman.qth.net> 
>  Sent: Monday, February 29, 2016 7:10 AM
>  Subject: Re: [Drake] 2-NT VFO Choice
>    
> May I suggest using a B&W FL10-100 which is a very small Low Pass filter.
> 
> I just happen to have one for sale for $10.00(grin)
> 
> 
>   
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