[Boatanchors] Alignment Question: High Side of Osc. vs Low Side

[D C _Mac_ Macdonald]

I believe you will find that especially for single conversion

general coverage receivers, that ALMOST always, the L.O. will

be on the high side for the lowest bands and on the low side

for the highest frequency band.

 

For the lower bands, the high side injection tends to provide 

better image rejection.

 

For the highest frequency band, use of low side injection will 

typically provide better local oscillator stability.

 
* * * * * * * * * * * 
* 73 - Mac, K2GKK/5 * 
* (Since 30 Nov 53) * 
* k2gkk at hotmail.com * 
* Oklahoma City, OK * 
* USAF & FAA (Ret.) * 
* * * * * * * * * * * 
 
 
> Date: Mon, 3 Jun 2013 13:28:30 -0700
> From: ianmwilson73 at gmail.com
> To: mvjohn at sympatico.ca
> CC: boatanchors at mailman.qth.net
> Subject: Re: [Boatanchors] Alignment Question: High Side of Osc. vs Low Side
> 
> One way is to use a signal generator. You should be able to set the signal
> generator at LO+IF and LO-IF and hear a heterodyne.
> 
> 73, ian K3IMW
> 
> 
> 
> On Mon, Jun 3, 2013 at 1:21 PM, Mark Johnson <mvjohn at sympatico.ca> wrote:
> 
> > Team,
> >
> > An issue that has always been unclear to me when doing an alignment of a
> > receiver. Some receivers have you adjust the local oscillator frequency to
> > the high side of the incoming signal and some to the low side. Some
> > receivers have you do either depending on the band your aligning. Example
> > I'm checking out a Hallicrafters SX-110 and the oscillator frequency is
> > adjusted to the high side of 3 of the 4 bands and the low side on the 4th
> > band.
> >
> > I understand the theory but how do I actually know or test for this during
> > the alignment process? That is, if instructed to adjust the oscillator to
> > the high side vs the low side, what do I test for or do to insure I'm on
> > the high side?
> >
> > Thanks very much.
> >
> > Mark VE3LU/VE3DJU
> >
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