[TowerTalk] Adjacent BC AM sigs DE K0FF

[K7GCO@aol.com]

In a message dated 08.05.00 08:20:48 Pacific Daylight Time, w4ef@pacbell.net 
writes:

<< 
 I thought a Q-multiplier was an active stage - wouldn't it be susceptible
 to IMD just like the front-end you are trying to cure? 
 
 As I recall the Drake R4C had a pretty narrow passive preselector - 
 but it was still something like 20 to 30 KHz wide (-6dB?? points) on 
 160 meters - not enough for BC adjacent channel rejection. 
 
 Mike, W4EF. >>

I believe intermod is created more in stages with a a mixer?  The Q 
multiplier as K3BU suggested doesn't have one if I remember right.  A preamp 
only, as frequently used is no different from the 1st RF stage used in tube 
receivers--without a mixer.  Buy cutting it's gain so it doesn't overload the 
front end of a receiver, is capable of giving greater selectivity before the 
receiver and is a very good design as I suggested in a previous post..    
k7gco 


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