[Heath] Fw: AM Crystal filter for SB-303

[G3OOU at aol.com]

All crystals will age over a period of years and this may result in the  
passband ripple becoming worse. I have noted this problem with several SSB  
filters and have managed to improve matters with some external impedance  
correction components.
 
I have had one SSB filter that had a broken internal connection and really  
bad ripple - this filter had to be opened up to correct the problem and  
resealed afterwards. I also noted that one of the internal inductors had not  
been sealed so the turns were still loose.
 
73

Bob

Bob F Burns G3OOU
C  Eng, FIET, MSE
G-QRP 6907
Crystal Palace Radio & Electronics Club:  www.g3oou.co.uk
Technical web site: _www.qsl.net/g3oou_ (http://www.qsl.net/g3oou) 
@BobFBurns on Twitter:  http://twitter.com/BobFBurns  

 
In a message dated 23/12/2014 14:32:12 GMT Standard Time, gggdds at js-net.com 
 writes:



Only the AM section is bad?  To confirm it's the  filter, it should only be 
the am section; after that, I would look at the am  detector circuit...I've 
never heard of a xtal filter "going  bad"...
Guy,
WA6OQQ


On 12/22/2014 6:07 AM, Jeancarlo Grisi  wrote:


Hi Eddy  

I am from BRazil and i got a SB301 receiver with AM cristal filter  Issue,; 
the AM audio is very bad... 

Could you please share your  solution for this problem. At website you told 
is possible we do another  filter. 

Thank you very much! 

And Merry Christmas  
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