Digest for sci.electronics.repair@googlegroups.com - 10 updates in 4 topics

bruce2bowser@gmail.com: Jan 13 06:57AM -0800

> Last attempt here. Parameters:
 
Yes, parameters as decided by the solar industry. Not you. And which costs are included in their well-cited 8-year estimate. Not yours.
 
> a) Full cost of the system to the consumer. That is NO subsidies so that the actual cost is used against the potential payback. Let's assume we are dealing with honest people unwilling to steal from the common Taxpayer.
 
The solar industry determines this. Not you.
 
> b) Standard current mortgage rates for a 20-year 0% down loan for the full amount. That would be 4% for a 0-down loan these days.
> c) I am using Energy Sage figures from their website for our zip code and energy provider, and the mortgage calculator from Bankrate.com.
 
The solar industry determines this.
 
 
> The total cost of power for those same 20 years, assuming historical increases
> of about 1.2% per year would be $54,466. So, the net payback would be: $12,197.
> At the end of the 20 year process.
 
The solar industry has determined this. Not you.
 
 
> Effectively, I have given up the opportunity to have $51,826 (in 20 years) in order to save $12,197 (after 20 years). A net difference of -$39,628.
 
> Now, Energy Sage states that our property value will increase by 3%. That would be roughly $15,000. Against the above figures, that really does not help, given that the $15,000 is valid only at the beginning of the process. The system becomes a liability as it approaches end-of-life. So, even that claim is a delusion.
 
> Do the math, if you have the capacity.
 
The solar industry has determined this. You're simply tryjng to re-invent the wheel.
 
> Nor have we calculated removal & disposal costs at the end of the system's service-life.
 
Because the solar industry has determined it in their eight-year estimate. After which solar operators make money.
"pfjw@aol.com" <peterwieck33@gmail.com>: Jan 13 07:18AM -0800

Gegen die Dummheit kämpfen die Götter selbst vergebens.
 
Peter Wieck
Melrose Park, PA
Cursitor Doom <curd@notformail.com>: Jan 13 11:53AM

On Sun, 12 Jan 2020 20:21:53 -0800, Jeff Liebermann <jeffl@cruzio.com>
wrote:
 
>Yep. Failure to observe my advice will result in divine retribution.
 
I wouldn't dare, Jeff. Thanks again for the tips; they will be
followed up....
--
 
No deal? No problem! :-D
Cursitor Doom <curd@notformail.com>: Jan 13 12:09PM

On Sun, 12 Jan 2020 19:59:52 -0800, Jeff Liebermann <jeffl@cruzio.com>
wrote:
 
>horizontal sweep (with the trigger turned off). That works much
>better in analog mode than in digital. Better yet, go back to using
>your analog Tek 2465A for looking at the VCO control voltage.
 
I'm afraid I don't have that option at the moment. The 2465A blew up a
couple of days ago and has now joined my pile of "awaiting attention"
junk. :( I didn't blow it up, by the way; it managed it all by itself.
 
>what "spurious spikes in the frequency domain on the RF output" might
>be. Is that like a spurious RF signal appearing on the SA swept
>display?
 
I think you may have missed the clarification I posted. Here it is
again:
 
"I could have put it better I guess. What I mean is I'm seeing thin
spikes in the RF output spectrum of the VNA at other frequencies than
the desired one. I'm guessing these spikes are the result of unwanted
transient voltage spikes present on the DC VCO control voltage which
sweeps the RF output frequency from 4Mhz through to 1.3Ghz."
 
>also imagine that your test setup or cabling may be causing these
>problems. A probe on the VCO line could easily pickup RF junk from
>everywhere.
 
I think that's a very valuable point there. One possible 'infection
vector' for noise is the method I'm using for sniffing the VNA. As you
may know, spectrum analyzers of this vintage were very intolerant of
DC on the input socket. There doesn't even seem to be a margin of
error! So any DC riding on the signal you're trying to obtain a
spectrum for and you blow up the front end. And I have a bit of a
complex when it comes to blowing up test equipment. I'm very, very
cautious these days, so I've just used a few turns of wire to couple
the signal from the VNA to the SA. This removes the DC risk, but does
mean there's no shielding around the sniffer coil. And right next to
these items there's my linear power supply powering up my Yaesu 857d.
Now the linear supply should be fine, being linear, but I'm just
wondering if the Yaesu, even in receive mode, might be generating some
stray spurious that the SA is picking up somehow. I'll switch those
items off when I try it again. My working practices are a bit slapdash
I must admit, but no worse than the average hobbyist I would imagine.
 
--
 
No deal? No problem! :-D
Gerhard Hoffmann <dk4xp@arcor.de>: Jan 13 01:28PM +0100

Am 13.01.20 um 13:09 schrieb Cursitor Doom:
 
> I'm afraid I don't have that option at the moment. The 2465A blew up a
> couple of days ago and has now joined my pile of "awaiting attention"
> junk. :( I didn't blow it up, by the way; it managed it all by itself.
 
Probably that hybrid that sends all those 24xx to their heaven.
Runs too hot. Don't expect to get a replacement hybrid.
 
Now back to the weird spectra that my Agilent 89441A presents under
remote control.
 
And while I'm at it, how does that Wehnelt cylinder stuff work in an
analog scope? I have a 200 MHz Iwatsu since > 35 years that I kinda love
and that has a trace sharpness / astigmatism problem.
 
cheers, Gerhard
Cursitor Doom <curd@notformail.com>: Jan 13 02:04PM

On Mon, 13 Jan 2020 13:28:46 +0100, Gerhard Hoffmann <dk4xp@arcor.de>
wrote:
 
>Probably that hybrid that sends all those 24xx to their heaven.
>Runs too hot. Don't expect to get a replacement hybrid.
 
No, it's not that chip that's gone. And those are perfectly happy to
run hot, the problem comes when people accidentally block the air
vents directly behind the chip, in which case yes, of course it will
blow.
 
--
 
No deal? No problem! :-D
DecadentLinuxUserNumeroUno@decadence.org: Jan 13 02:40PM

Cursitor Doom <curd@notformail.com> wrote in
>>retribution.
 
> I wouldn't dare, Jeff. Thanks again for the tips; they will be
> followed up....
 
Divine intervention is what happens when your design fails to impress,
and God decides to "let the smoke out" of your circuit.
Fox's Mercantile <jdangus@att.net>: Jan 13 09:11AM -0600

On 1/13/20 6:09 AM, Cursitor Doom wrote:
> I'm afraid I don't have that option at the moment. The 2465A blew up a
> couple of days ago and has now joined my pile of "awaiting attention"
> junk.:( I didn't blow it up, by the way; it managed it all by itself.
 
My 2445 lost it's trace.
I replaced the HV module. $56 from a guy in Greece.
Works fine now.
 
 
--
"I am a river to my people."
Jeff-1.0
WA6FWi
http:foxsmercantile.com
Michael Terrell <terrell.michael.a@gmail.com>: Jan 13 01:02AM -0800

On Sunday, January 12, 2020 at 11:07:20 PM UTC-5, Dave Platt wrote:
> eventually send out) two things: the problem is in _their_ equipment
> (not yours), and you know enough about the situation that they can't
> scam you into agreeing to pay for a service call for your inside wiring.
 
Telco hires trained monkeys to take service calls. I had one insist that it had to be my inside wiring. That was one foot of new station wire to a new jack on the other side of the wall. They finally sent two techs out who determined that the 50 year old underground trunkline was bad and switched me to another bad copper pair. Centurylink isn't replacing bad underground trunk, they are waiting to replace it all with Fiber, one of these decades. I lost service during Hurricane Irma. A pedestal at the end of my street was pulled out of the ground by a damaged power pole. The pole was replaced, but not the pedestal. They insist that my service was restored, and claim that I owe a lot of money for a line that never worked, again. I tried to close the account at 90 days, but they would only do it if I called from the number I wanted terminated. I asked, "How do I do that on a dead line?" They shrugged and tried to sell me a cell phone.
 
Nothing but poorly trained monkeys. A lot of businesses in the area had to go to VOIP to have usable phone service. Thankfully, the downtown area has 1Gb fiber internet at a good price.
Jeff Urban <jurb6006@gmail.com>: Jan 13 12:16AM -0800

>If you're seeing only 0.83A, then you're looking at the current >drawn by a fan or light bulb in the fridge, not the compressor.
 
No, I am sure of what I said, that was considered at the time.
 
But if the compressor is not pumping into a loaded condenser the power drain will be low as I stated. Your fans n shit are more like ¼ amp.
 
Go look, you'll see I am right. It just so happens I have recent experience with this. Not many people last year went into a store and convinced the manager to allow connecting an ammeter to one of their new refrigerators. I did.
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