Tuning SSB filter

[Bob Burns]

Hi Reavis
 
Has your filter moved in frequency of just developed too much ripple? Take  a 
look at
 
_http://www.mines.uidaho.edu/~glowbugs/Heathkit%20SB_HW%20Filters.pdf_ 
(http://www.mines.uidaho.edu/~glowbugs/Heathkit%20SB_HW%20Filters.pdf) 
 
for information on the Heath SB/HW filters at 3.395MHz.
 
Over this period of time it is difficult to precisely know what has moved  
the most although the crystals will certainly have aged somewhat. Apparently  
there is a high LC ratio tuned circuit in the filters that has a considerable  
effect on the passband.
 
You could try a simple tuned circuit at the IF frequency in parallel  with 
the output of the filter to see if changing the termination from resistive  to 
reactive makes any difference at all.
 
73

Bob 

G3OOU
G-QRP  6907
_http://members.aol.com/rfcburns_ (http://members.aol.com/rfcburns) 



   

-----------------------------------------------------------
Products bought, sold or traded here is the responsibility of the
parties involved.  This list and the City of Tempe are not responsible
for losses or misrepresentations of any kind.  Buyer beware!

-----------------------------------------------------------
This list is a public service of the City of Tempe, Arizona
-----------------------------------------------------------

Subscription control - http://www.tempe.gov/lists/control.aspx?list=HEATH
To post - HEATH at LISTS.TEMPE.GOV
Archives - http://lists.tempe.gov/archives/HEATH.html