[R-390] RF Alignment Questions

[n4buq at knology.net]

On Tue, 27 Feb 2007 11:39:31 -0500, Carole White-Connor 
<carolew at bellatlantic.net> wrote :

> My R-390A is coming along nicely. I sounds great and is performing nicely 
on
> most bands. Now, I want to tweak the RF alignment on the 2 mhz and 3 mhz 
bands.
> Here are my questions:
> 
> 1. According to the manual, I should set the bandwidth to 8 khz. Is that
> correct? I would think it should be adjusted more narrowly.

The manual should be correct here.  I don't think it really matters all 
that much as you are looking for peak readings on the diode load.  If you 
go a lot narrower, the signal is just harder to get in the passband of the 
filter.

> 2. The output meter is adjusted to the diode load. The signal generator is
> adjusted to give an output of -3 to -7 V. Is that on the -DC range?

That is -3 to -7 VDC.

> 3. Do I set the signal generator for modulated or unmodulated output?

Modulated.

> 4. Would there be any great problem if I adjusted the slugs and trimmers 
to WWV
> on the 2 mhz band and CHU on the 3 mhz band without a signal generator?

You would be tweaking them at a single frequency.  The caps are supposed to 
be tuned at one end and the slugs at the other.  I think the slugs are 
adjusted at the lower frequency and the trimmers are adjusted at the higher 
frequency.

> As always, thanks!
> 
> Joe Connor

There are guys on the list who can better expound on these, but those are 
the quick answers.

Barry - N4BUQ