[R-390] the saga cont. pt 10

[ka9egw at britewerkz.com]

Interestingly, although the schematic shows the center tap of the primary
grounded, the wire connecting the two halves of the primary [the winding
with 2 pins and one fixed cap] is laid right on the supporting frame of the
can but not soldered to it.  Neither primary pin shows any continuity to
ground.  It's this way on both cans.  One's a teledyne and one's unmarked.

It IS 2 pins on the primary end and 4 on the secondary side, right?  I'm not
misreading the schematic, right?

*Now* I *AM* confused.

73, Brian KA9EGW

-----Original Message-----
From: r-390-bounces at mailman.qth.net
[mailto:r-390-bounces at mailman.qth.net]On Behalf Of ka9egw at britewerkz.com
Sent: Sunday, September 26, 2010 4:03 PM
To: r-390 at mailman.qth.net
Subject: [R-390] the saga cont. pt 10


Doing the RF alignment.  Working from the idea this thing may have been
over-diddled at some point.  Almost every adjustment so far has required
multiple turns of slug or significant movement of the cap to dial things in.
All well and good til the top band, [16-32] Mc cans.  The way this ckt is
put together, do you all think the antenna trim control should have much
effect when using the balanced input, or is it simply coincidental that on
the other bands it does?
I swapped in a different can from my spare RF deck, and same deal...
73, Brian KA9EGW

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