[SADXA] RFI

[W7EXG (Bill)]

Great Wes, 

Swap it out and see if it fixes it. 

Sound familiar to me!! Hi Hi

If the relay was chattering, it was in some kind of oscillation mode. 

That suggests the open and closure of the contacts was pivotal in trying to
correct the issue. Without seeing the schematic, it is hard to judge the
role of the cap when in this mode. 

Good Luck.

73's
Bill W7EXG

-----Original Message-----
From: sadxa-bounces at mailman.qth.net [mailto:sadxa-bounces at mailman.qth.net]
On Behalf Of Wes
Sent: Wednesday, July 08, 2020 3:12 PM
To: sadxa at mailman.qth.net
Subject: Re: [SADXA] RFI

By inspection of the schematic (but not measurement since I'm under orders
to 
not mess with this until the heatwave is over) I'm suspecting the run
capacitor 
is leaky.  This would allow the starting relay to energize.  I'm not sure
why it 
would quickly deenergise and become an oscillator but clearly this is an LC 
phenomenon so absent further troubleshooting, I'm running with the idea.

By serendipity Annette had something to pickup at 12:30 today about a
quarter 
mile from Grainger so I looked at their website for a capacitor.  They had
one 
shown in stock, not the right size but the right capacitance and voltage 
rating.  So I ordered it, figuring I can make it work.  They are using
curbside 
PU so when I got there the guy looks and tells me that the part won't be
here 
until tomorrow.  Sure enough that's what it said on the paperwork that I was
in 
too much of a hurry to read.

When we got home I looked on their site to see where I went wrong.  That
part 
was no longer shown in stock, but another better one (more $$) was.  So I
called 
them up (800 number) and asked them to cancel the original order and save me
the 
new one.  He said sure but when he came back to the phone he said that even 
though it was shown in stock, it too wouldn't be available until tomorrow.

I'm sure glad this thing is still running.

Wes  N7WS


On 7/8/2020 1:00 PM, W7EXG (Bill) wrote:
> Hi Wes,
>
> That's Great.
>
> I love helping out, when I really didn't do anything!! Hi Hi
>
> Sometimes, all it takes is a memory jog!!
>
> Good Luck.
>
> If you need any help with the schematic, especially if it involves IC
> questions, let me know. I might have the same schematic (or similar
section)
> here!! (Or scan and send me the section of interett)
>
> 73's
> Bill W7EXG
>
>
> -----Original Message-----
> From: sadxa-bounces at mailman.qth.net [mailto:sadxa-bounces at mailman.qth.net]
> On Behalf Of Wes
> Sent: Wednesday, July 08, 2020 10:14 AM
> To: sadxa at mailman.qth.net
> Subject: Re: [SADXA] RFI
>
> Hi Bill,
>
> Thanks for your reply.  Your mention of a schematic in the box jogged my
> memory
> and I've discovered a weathered copy of a schematic that I removed from
the
> box
> years ago and filed away for safekeeping.  It's hard to read but I'm
> scanning it
> and trying to improve readability.
>
> We'll see if it helps.
>
> Thanks again!
>
> Wes
>

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