[R-390] Power Cords on eBay

[Bill Hawkins]

Ah, yes, the GFI problem is the other ground issue. The old
power line filters were designed for worst-case environments.
Each side of the line is bypassed to ground by 0.1 mfd. The
reactance at 60 cycles is about 10K ohms. That's enough to
trip a GFI.

The ground is important, so either the GFI has to go or you'll
need about a 200 watt isolation transformer. IMHO, GFIs make
sense around plumbing, where appliances may not be grounded.
You are much more likely to get across the line on a workbench.
Anybody that remembers to keep one hand in a pocket while
working around live equipment doesn't need a GFI.

You have a non-A if the antenna trim is on the right side of the
panel, near the rack handle about mid way up. You have an A if
the antenna trim is in the center near the top of the panel.

Regards,
Bill Hawkins


-----Original Message-----
From: r-390-bounces at mailman.qth.net
[mailto:r-390-bounces at mailman.qth.net]On Behalf Of Jack/AE7DX
Sent: Wednesday, October 05, 2005 11:09 PM
To: John Lawson
Cc: R-390-List
Subject: Re: [R-390] Power Cords on eBay


I was given an R-390 a couple of weeks ago and had to replace a damaged 
power cord. Upon turning the radio on I found that it trips the GFI 
outlet in my shack/garage even with no antenna connected. I then 
disconnected the ground (yes, only temporarily as a test) and find that 
the '390 works without out tripping the GFI. I have no documentation so 
I cannot determine a cause at this point.

I am curious as to how I can determine whether this is an R-390, an 
R-390A or some other variation. It has been many years since I have seen 
one and this unit has had the front name plate removed so I don't even 
know the manufacturer. Can anyone suggest any identifying 
marks/labels/etc to assist?

Thanks,

Jack, AE7DX

John Lawson wrote:

>
>
> On Wed, 5 Oct 2005, Richard Loken wrote:
>
>> On Wed, 5 Oct 2005, Barry wrote:
>>
>>> I wondered about that.  I didn't know if the original cords were
>>> non-polarized or not.
>>
>>
>> Polarization was irrelivant.  The manual told you in no uncertain 
>> terms to
>> run a separate ground wire at all times.
>
>
>
>    I notice now (after my previous posting) that this current cordset 
> is inexplicably two-wire.  I do repeat that the cable I bought from 
> him in August was in fact three-wire, and is working well on my 
> R-390.  I wrote him a quick note to ask about why he decided not to 
> use a grounded cordset on this - we'll see what the response is.
>
>
>  And I certainly agree that the radio oughta be tied firmly to Mother 
> Earth - by any means available.
>
>
>  Cheers
>
> John  KB6SCO
>
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