- Cell phone signal booster - 2 Updates
- Maybe I need another 'scope? - 18 Updates
- speaker refoam - 2 Updates
| Rob <nomail@example.com>: Nov 21 01:29PM > Has anyone used a cell phone signal booster, and would like to share their experience? Their experience in jail, you mean? Or their experience working to pay the hefty fine they got? |
| John-Del <ohger1s@gmail.com>: Nov 21 06:35AM -0800 On Wednesday, November 21, 2018 at 8:29:09 AM UTC-5, Rob wrote: > > Has anyone used a cell phone signal booster, and would like to share their experience? > Their experience in jail, you mean? > Or their experience working to pay the hefty fine they got? We're out in the sticks in a town that is itself in the sticks, so our cell reception is sketchy at best. My son installed an "M-Cell" which is sold by AT&T and connects to our cable wifi. Works great anywhere inside the house, not so much outside though. Without the M-Cell, we'd have to go on the front porch to use the cells. |
| jurb6006@gmail.com: Nov 20 08:44AM -0800 >"Sometimes it may be better or easier to just isolate the test equipment from the ground and not the unit under test. " "Floating the scope" is not good practice and may be illegal in a commercial setting. I do it but I am the type who works on live wiring and all that, there is specific and unmitigable set of rules for that which I will not attempt to list here. You have to REALLY know HOW to respect electricity, ESPECIALLY with tube equipment. Pretty sure all scope manufacturers advise against it, some might try to void the warranty, maybe. Thee are other dangers, such as any ground fault in the test equipment you float can damage the DUT. It most certainly can create insidious shock hazards as well, not just the ground and metal case of the scope, but ANY and ALL other test equipment connected to the same circuit(s). I'll do it but I do not recommend it. Save that for when you have no choice. |
| etpm@whidbey.com: Nov 20 08:51AM -0800 On Tue, 20 Nov 2018 10:02:40 -0500, Ralph Mowery >solid scope draws without going to check, but it could probalby be >powered by 2 transformers of 24 volts at 2 amps or so placed back to >back. I think I need to take a look at one of those. Thanks, Eric |
| etpm@whidbey.com: Nov 20 08:52AM -0800 >> Phil Hobbs >If you're going to get one you don't need, consider making it a pocket scope. Quite handy, even with modest specs. >NT I have been looking at some on eBay. Do you have any suggestions? Thanks, Eric |
| etpm@whidbey.com: Nov 20 08:57AM -0800 On Tue, 20 Nov 2018 08:08:50 -0500, Tim Schwartz <tim@bristolnj.com> wrote: >between the amp and the scope. >Regards, >Tim <SNIP> Thanks Tim. That was just the sort of advice I was looking for. I don't have a lot of experience with oscilloscopes and every time I use mine I need to make sure I'm very careful to get everything set correctly. Eric |
| Tim R <timothy42b@aol.com>: Nov 20 08:52AM -0800 I'm sure you intended humor but I am appalled you buy beer in bottles. Light is the enemy of beer, and the better beers are the more fragile. If you like that nasty skunky taste, okay; but we real beer drinkers buy in cans. https://munchies.vice.com/en_us/article/xy7vn4/this-is-why-your-beer-tastes-skunky |
| Ralph Mowery <rmowery28146@earthlink.net>: Nov 20 12:30PM -0500 In article <soe8vdt7b4ud67b6q6pkn11ct68krrf1i7@4ax.com>, etpm@whidbey.com says... > I think I need to take a look at one of those. > Thanks, > Eric Look into it at this company. They often put it on sale and with free shipping. I bought one there and a friend did also. They seem to be fine scopes for the price, especilally if you have an analog scope to use. They sell several other scopes of the same brand along with many other items at a good price. |
| tabbypurr@gmail.com: Nov 20 09:38AM -0800 > the way the signal looks on a scope. > TYhjanks, > Eric it won't change the signal, except for very high frequencies far above audio NT |
| tabbypurr@gmail.com: Nov 20 09:41AM -0800 > I have been looking at some on eBay. Do you have any suggestions? > Thanks, > Eric Not really, totally depends what you want NT |
| Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net>: Nov 20 02:22PM -0500 On 11/20/18 10:02 AM, Ralph Mowery wrote: > solid scope draws without going to check, but it could probalby be > powered by 2 transformers of 24 volts at 2 amps or so placed back to > back. Does it have a separate A/D for the voltmeter, or is it stuck with 8-bit resolution? Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC / Hobbs ElectroOptics Optics, Electro-optics, Photonics, Analog Electronics Briarcliff Manor NY 10510 http://electrooptical.net http://hobbs-eo.com |
| Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net>: Nov 20 02:25PM -0500 > I have been looking at some on eBay. Do you have any suggestions? > Thanks, > Eric My next one might be something with serial decode. Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC / Hobbs ElectroOptics Optics, Electro-optics, Photonics, Analog Electronics Briarcliff Manor NY 10510 http://electrooptical.net http://hobbs-eo.com |
| etpm@whidbey.com: Nov 20 03:04PM -0800 On Tue, 20 Nov 2018 08:52:58 -0800 (PST), Tim R <timothy42b@aol.com> wrote: >Light is the enemy of beer, and the better beers are the more fragile. >If you like that nasty skunky taste, okay; but we real beer drinkers buy in cans. >https://munchies.vice.com/en_us/article/xy7vn4/this-is-why-your-beer-tastes-skunky Yeah, I usually buy beer in cans. More often now good beer is available in cans. It used to be good local beer was only available in brown bottles. It is truly amazing how much good beer there is today. Eric |
| etpm@whidbey.com: Nov 20 03:05PM -0800 On Tue, 20 Nov 2018 14:25:38 -0500, Phil Hobbs >My next one might be something with serial decode. >Cheers >Phil Hobbs What does serial decode do? Thanks, Eric |
| etpm@whidbey.com: Nov 20 03:07PM -0800 On Tue, 20 Nov 2018 12:30:07 -0500, Ralph Mowery >fine scopes for the price, especilally if you have an analog scope to >use. They sell several other scopes of the same brand along with many >other items at a good price. I think you forgot to include a link. Eric |
| Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net>: Nov 20 07:01PM -0500 >>> Eric >> My next one might be something with serial decode. > What does serial decode do? It reads out the hex data on a serial bus such as SPI or I2C. Sort of a poor man's logic analyzer. Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC / Hobbs ElectroOptics Optics, Electro-optics, Photonics, Analog Electronics Briarcliff Manor NY 10510 http://electrooptical.net http://hobbs-eo.com |
| Terry Schwartz <tschw10117@aol.com>: Nov 20 04:09PM -0800 I use a serial decode scope all the time -- to debug vehicle CAN bus transactions. It's more of a rich man's logic analyzer. It can do so much more than a logic analyzer. Terry |
| Ralph Mowery <rmowery28146@earthlink.net>: Nov 20 07:43PM -0500 In article <ts49vd1oo1d69vlef7q1m8hchl4tq7vvvb@4ax.com>, etpm@whidbey.com says... > >other items at a good price. > I think you forgot to include a link. > Eric https://www.circuitspecialists.com/digital-storage-oscilloscopes Yes I did. |
| Ralph Mowery <rmowery28146@earthlink.net>: Nov 20 07:52PM -0500 In article <pt1msq$722$1@dont-email.me>, pcdhSpamMeSenseless@electrooptical.net says... > Does it have a separate A/D for the voltmeter, or is it stuck with 8-bit > resolution? I don't know how it determins the voltage. It does give the frequency and time period. Not too sure how accurate it is, but did read a 9 volt battery to 2 decimal places, but I did not check it with my digital voltmeter to see how close it was. For all I know it could have been off half a volt. I don't use it when I want a ver accurate volt measurment,but as I am just using it for hobby work, good enough for me most of the time. This is not a high dollar test instrument. |
| Phil Allison <pallison49@gmail.com>: Nov 20 08:54PM -0800 Tim Schwartz wrote: > prefer)for the DC voltage measurements. I like my old Heathkit VTVM for > troubleshooting, as you are unlikely to cause any serious damage to the > meter, as could happen with a digital. ** Yes - plus VTVMs have wide frequency response on the AC ranges unlike the vast majority of hand held DMMs. > The scope you have is all you need, as what you need it for is the AC > part of the waveform. Set the scope to AC coupling at the input and > you'll be looking at the ripple on the supply. ** Ripple voltage on the first filter cap ( after the rectifier) in a PSU looks *sawtooth* shaped - not sine wave. The voltage rises sharply during charging and falls slowly when discharging. > If the ripple exceeds 400 volts (8 divisions at 5 volts each is 40Vp-p > and with a 10x probe that gets you to 400Vp-p) then something is seriously > wrong with your power supply or measurement technique, ** That is a massive understatement !!. Ripple voltage during normal operation should not be greater than 10% of the DC supply voltage. So, for a 400VDC supply, the p-p ripple seen on a scope should not exceed 40Volts. An AC voltmeter will show about 14V instead, long as there is a cap ( say 0.1uF) in series to block the DC voltage. ... Phil |
| stratus46@yahoo.com: Nov 20 03:18PM -0800 On Tuesday, November 13, 2018 at 11:06:15 AM UTC-8, John-Del wrote: > This is a favor for a friend of a friend. I've never done a refoam before but I realize it's not rocket science but there's probably a learning curve. I won't have the option of do a trial run. > These drivers come out of a pair of Infinity Crescendos, and the plastic dust caps seem well bonded to the cone. I'd much prefer to shim the cone before bonding the foams, but I don't know if the dust caps can be removed somehow from the cones without damaging them. > Any advice appreciated. I've done 6 refoams on Advent woofers and 2 on 6" JBL drivers. The first Advent kit came with shims and new dust caps. I followed the instructions and they worked fine. The next sets came without shims and I did not use any and everything is fine. I know the gap in the Advent drivers is quite large though I don't know if it's different in other brands. I have no idea what the gap is in the JBL but had no problem. As long as the spider hasn't shifted I don't think you'll have problems. G² |
| jurb6006@gmail.com: Nov 20 06:04PM -0800 >"As long as the spider hasn't shifted I don't think you'll have problems" You can The voice coil could be ike: |/|_|/| or |\|_|\| with the top of the coil perfectly aligned but the bottom of it off due to the cone edges not being in the right position I use the generator and find which direction has the most leeway until it rubs and then "coax" it into the best position. This way when it gets pushed and expands thermally the clearances should not disappear. |
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