[R-390] Z503 Replacement

[bavarianradio at comcast.net]

Hello Folks, Well, I went looking around here and found a partially stripped R-390A IF deck. The mechanical filters are missing but the Z-503 assembly is there. It measured around 23 ohms so I have installed it in the 390 IF deck. I haven't tested it yet as I have a limiter problem to sort out first. I'll report back when I have some results. Fwiw, It looks very different inside. I'll get some photos and link to them soon.  73's Ross W1EKG
----- Flowertime01 at wmconnect.com wrote:

Don,
I see what you are saying. I know why I have stayed a repairman and
never
went off to be an engineer.
Design is a science and best practiced by committee. One can do it alone
but you do get better results from a group activity. I become more
appreciative of the engineering and design in these R390 receivers every
time one of
these threads materialize. From time to time Fellows say nice things
about me.
I thank them. I think I do not say enough good things about all you
Fellows. The stuff I have learned just reading the mail over the years
is a lot. I
have to read what is posted. I have to think about it. But knowledge is
certainly put forward and I try to gain from it. I think the spirit of
the R390
reflector is why this reflector continues as robustly as it does. Sure
there
is a lot of trivia on models, production runs, part numbers. But we open
a
lot of serious engineering design topics. We surly have no idea what
those
engineers were thinking back then. But we look at what was produced and
ask
why, and what can we understand from this or that problem. We post a lot
of
things about a lot of experiments we have performed. That experiment may
have
not been what someone else would do. But things get shared and lot of
learning takes place.
Enjoy.
Roger AI4NI
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