[R-390] the saga cont pt 13

[djed1 at aol.com]

 I wouldn't be surprised to see a couple of dB ripple in any of the mechanical filters.
Ed  W2EMN

 


 

 

-----Original Message-----
From: ka9egw at britewerkz.com
To: r-390 at mailman.qth.net
Sent: Sun, Oct 3, 2010 2:47 am
Subject: [R-390] the saga cont pt 13


So after swapping a bunch of cans, I got the balance alignment done and
started doing the rf alignment 'for real'.  My God this thing is turning out
to be sensitive--whoever said it'd take a screen room and a good one to get
a meaningful sensitivity measurement was right.  I had to cap the unused
inut with some aluminum foil to blank out leakage from a non-local BC
station, and having done that, on 850kc [first freq I tried this at] it has
no problem hearing .1 uV/400/30%.

Onward and upward...after I finish the RF alignment "for real" the first
time [since it's been burning in for a week now], I may go back and peak the
IF's on 455 across the board rather than stagger tune them.  The rx is now
sensitive and quiet enough I can hear the difference as I tune across a 1uV
sig with the 16kc filter...there appear to be 2 peaks a couple kc apart with
the trough ~1-2 dB down...is that typical for a 16k filter or am I hearing
the separate peaks of the stagger tuning?

What do you suppose it'd do with more than a couple feet of wire for an
antenna?  HI HI

73 de KA9EGW

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