[HBR] Need advice: tuning set up for 1st and 2nd IF coils

[B Smith]

Hi Cal

For best accuracy  during testing you will probably need to isolate the IF
coil with a couple of 100 K resistors.

On you sig Gen you can probably add additional 
temporary" capacitance to coil A or add additional cap to the tuning
variable to lower the frequency range the amount that you need. A diode and
VTVM would work as a detector or use a scope .

http://manuals.elenco.com/manuals/sg-9500%20Schematics.pdf 

What are you using for IF coils?


73

breck k4che
 
 
 
 
-------Original Message-------
 
From: C Eus
Date: 6/10/2010 7:30:03 AM
To: hbr at mailman.qth.net
Subject: [HBR] Need advice: tuning set up for 1st and 2nd IF coils
 
Hello to all:
I recently dusted off my generator, an Elenco SG-9500.  It goes as far down
as 100 Khz and that's it. I have a DVM that I was thinking about using to
measure the maximum output tune on these transformers.  Would it be better
to take the output and rectify it down to DC and check for a maximum DC
level (ala a rudimentary diode detector) or can I simply hook up the output
and check for max AC output? I think the DVM is a 1MEG/volt input unit so I
don't suspect this tester will load down the circuit anytime soon.
 
Much thanks.
 
Cal.
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