[R-390] IF sweep alignment

[2002tii]

Bob - N0DGN insultingly wrote (most of it, twice):

>The R-390 series has NO crystal filters at all.  The R-390s used 
>pure circuitry to achieve the end, while the R-390As use the 
>mechanical filters.

>I'd suggest re-looking at the circuitry!
>
>Z-501 is NOT a crystal filter whatsoever!  For personal edification 
>and amazement - it happens to be THE 455Kc Oscillator!
>
>The only crystal that has EVER been on/in the IF deck.
>
>It contains ONE 455Kc crystal, a trimmer capacitor to adjust the 
>crystal, should it so happen to be a "tad" off, AND the actual slug 
>tuned coil for the remainder.  It ties to ONE tube for the purpose 
>of creating the ENTIRE 455Kc oscillator that is the HEART of the 
>entire IF deck.
>
>I really do wish that folks would "bother" to read the theory and 
>operation section of ANY of the manuals regarding the R-390A - 
>BEFORE they perform ANY maintenance or alignment.  The alignment 
>BEGINS with setting Z-501 ON 455KC.

Your stunning display of ignorance, compounded by reiterating it in 
the same disrespectful, abusive manner in the face of 
incontrovertible evidence from several sources to the contrary, 
boggles the mind.

As others have said (with cites to the manuals), Y501 (contained 
within Z501) is, most assuredly, a crystal filter.  And the "ONE tube 
[to which it ties] for the purpose of creating the ENTIRE 455Kc 
oscillator that is the HEART of the entire IF deck" is actually V501, 
the "First IF Amplifier."  No amount of holding your breath and 
stamping your feet will make it otherwise.

Why anyone would think that a 455 kHz oscillator would be the "heart" 
of any 455 kHz IF is beyond comprehension.  (There is, of course, the 
BFO (Z502), the "other" PTO in a 390A, but that is hardly the "heart" 
of the IF -- in fact, it is not really part of the IF circuit at all, 
rather it is coupled directly to the detector through a small capacitance.)

Over and above your manifest technical incompetence, which could 
otherwise just be laughed at and dismissed, you directly insulted 
three list members with your abusive drivel.  I suggest that you 
should, therefore, make a contrite, humbling, and sincere on-list 
apology to Brian, Steve, and Tom before you even think of posting 
anything else on this list.  Better yet, just go away.

Best regards,

Don