[Boatanchors] Mixer Troubleshooting Question For my Homebrew Superhet Novice Receiver

[Bill Meara]

 Scott:   Oh man, I built one of these.  I have it on my shelf.   It still works.   
I too had trouble getting it going.   I found that it was very hard to get good crystals at 455 kc.  The problem was the filter, not the mixer.   I got around this for a time by substituting a 455 kc IF can for the filter.  This left the receiver very broad, but it allowed me to us it until I was able to get a decent 455 kc filter in there.  
Lots of info here: https://soldersmoke.blogspot.com/search?q=Mate+for+the+Mighty+Midget
And here:  http://www.gadgeteer.us/erart.htm
I will dig up the Electric Radio article for you.  I think it was November 1998?   It has details on my temporary substitution of the filter with a 455 kc IF can. 
Hang in there.  You are close.  
73  Bill  N2CQRhttp://soldersmoke.blogspot.com 





    On Thursday, February 25, 2021, 09:46:34 PM EST, whitebear1122 at comcast.net <whitebear1122 at comcast.net> wrote:  
 
 Hi Guys, I'm scratching my head over the mixer circuit on my Novice
superhetrodyne receiver project.  Mixers should be simple, and I should see
the addition and the subtraction of the LO and RF.  I'm seeing diddly squat.

 

Here is a link to the schematic and some measurement notes around the mixer.
The mixer is getting the RF signal and the HF oscillator but I'm not seeing
what I'm expecting to see at 730 KHz on the spectrum analyzer.  

 

What sort of p-p amplitude should I expect at the output of the mixer on pin
6?

 

Scotts Mate For The Mighty Midget Receiver Notes
<https://www.qsl.net/wa9wfa/ha00000.htm> 

 

This is just my 2nd homebrew project so I'm still busy learning things.  Any
advice or hints would be appreciated.  I must be overlooking something
obvious.  

 

Thanks, Scott WA9WFA

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