[R-390] RE: RE: 390A relay problems

[David Wise]

Hi Bob, 

I should have included the standard plug for
the Y2K manual, available for free download at
www.r-390a.net .

The R-390 and R-390A work oppositely with respect
to the antenna relay, so getting the sense wrong
is a common mistake.

The humming partial pull-in is without a doubt
due to the slow ramp-up from the inrush limiter,
probably combined with the bridge rectifier's aging.
Replace it and the symptom will be reduced or eliminated.

I have to get into my relay one of these days.
Sometimes it hangs up when I go to CAL.  I think
it's a mechanical issue; it feels as if the armature
is hanging up on a burr.  It clears if I reach in and
jostle it just so.  Anybody have a hot tip for this?

73,
Dave Wise

> -----Original Message-----
> From: r-390-bounces at mailman.qth.net
> [mailto:r-390-bounces at mailman.qth.net]On Behalf Of Bob Young
> Sent: Thursday, October 04, 2007 5:58 PM
> To: r-390 at mailman.qth.net
> Subject: [R-390] RE: RE: 390A relay problems 
> 
> 
> 
> Yes, thanks Dave,
> 
> I'm used to big tube amps that draw a lot of plate current 
> when standby is 
> switched off or transmitters which do the same thing. I think 
> mine may be 
> doing it though because of the long gradual build up in 
> voltage of the 
> inrush limiter, it doesn't do it if plugged into the wall 
> bypassing the 
> limiter, or it could be a hint of a later problem?
> 
> Bob
> KB1OKL