[SADXA] RFI

[Wes]

It's been a long time coming but the slightly cooler WX this morning was 
conducive to climbing up on the roof and working on this again.  Since my last 
message I've also purchased a new starting relay and starting capacitor just in 
case my original diagnosis was wrong.  But it wasn't; a new run cap solved the 
problem.  It's nice to win one once in awhile.

Wes  N7WS


On 7/8/2020 3:12 PM, Wes wrote:
> 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
>>
>