[R-390] R-390 IF adjustment of .1 1. bandwith

[Roger Ruszkowski]

Bill,

Now that we have counters the question becomes how to 
adjust the trim cap to pull the crystal onto 455 and get the 1Khz
band pass also centered on the 455.

As the TM came before counters, the TM does not 
address this adjustment process.

Fellows how should we conduct this adjustment process?

Roger.



Bill,
 
You are on it. In the beginning there were no freq counters in the shops.
 
You rocked the signal generator into the 455 crystal for max output and used that
as 455 to align the If deck.
 
We were looking at the procedure to tweak up the crystal trimmer cap and the 1Khz bandwidth slug
on the IF deck. The original manual has a process but it does not read well.
 
Thank you 
 
Roger


-----Original Message-----
From: Bill Hawkins <bill at iaxs.net>
To: R-390 <R-390 at mailman.qth.net>
Sent: Mon, Oct 21, 2013 3:26 pm
Subject: Re: [R-390] R-390 progress!!





-----Original Message-----
From: Roger Ruszkowski <flowertime01 at wmconnect.com>
To: R-390 <R-390 at mailman.qth.net>
Sent: Mon, Oct 21, 2013 4:34 pm
Subject: Re: [R-390] R-390 progress!!


Bill,
 
You are on it. In the beginning there were no freq counters in the shops.
 
You rocked the signal generator into the 455 crystal for max output and used that
as 455 to align the If deck.
 
We were looking at the procedure to tweak up the crystal trimmer cap and the 1Khz bandwidth slug
on the IF deck. The original manual has a process but it does not read well.
 
Thank you 
 
Roger


-----Original Message-----
From: Bill Hawkins <bill at iaxs.net>
To: R-390 <R-390 at mailman.qth.net>
Sent: Mon, Oct 21, 2013 3:26 pm
Subject: Re: [R-390] R-390 progress!!


Somewhere in the dim past, I ran across a procedure for aligning
an IF ending in a crystal filter that didn't use a counter.

Crystals age and drift in frequency, so you switch to the tightest
filter position and tune the signal generator for peak output from
the filter. The frequency won't be far from 455, but it could be 100
Hz away, which would mean low output from a strip aligned by a counter.

Use the frequency that peaks the crystal to align the IF strip.

Worked for me. Anybody else done that?

Bill Hawkins


-----Original Message-----
From: Roger Ruszkowski
Sent: Sunday, October 20, 2013 10:20 PM

I never liked the procedure to do the .1 and 1 KHz adjustments on the
front end of the IF deck.

If you have a good counter  just run 455 into E210 and peak both of
those IF bandwidths as
best you can.

You still want to run 455 at 150 UV into the IF deck and get good clean
27:1 wiggly 30:1
modulation to CW ratio at 1/2 watt on the line audio output into a 600
ohm (2 ea 1200 ohm 1/2 resistor ) load.


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