| captainvideo462009@gmail.com: Nov 30 08:21AM -0800 I have an old Dell Lattitude D630 laptop. Is there a way to come out of the VGA jack on the back of my laptop and somehow end up with composite or S video out? I tried an adapter that my son said he had used to do this in the past. It plugs into the RGB jack in the back and it has two short cables out of it. One has an RCA female jack on the end of it and the other has an S video female. I didn't try S but although I can get an image on my composite monitor you can see that there is more than one image and it's out of sync. I tried adjusting the display settings and that seems to put the frequency way off. I used to have a video board on an old DOS computer that had an RCA jack on it and it was very handy. Is this still possible to do? I think that I read somewhere that anything ten ears older or less should be able to support this. I don't know how old my laptop is but i don't think that it's over ten years. Thanks, Lenny |
| Jeff Liebermann <jeffl@cruzio.com>: Nov 30 07:41AM -0800 On Wed, 30 Nov 2016 00:04:30 -0500, Michael Black <et472@ncf.ca> wrote: >But having opened some of the "atomic" clocks I have it's also a surprise >that the loopsticks aren't particularly long. Even the wall clock doesn't >ahve a longer loopstick than the portable. No clue who said it first, but the consensus is that RF is magic. The object of the antenna is to produce the best possible SNR, not the strongest signal. If you replace the tiny antenna with a bigger antenna, the WWVB signal will increase, but so will the received atmospheric noise level, resulting in no net improvement in SNR. What will change is the Q (essentially the bandwidth) of the receiver front end. A low Q wide band loopstick will pickup far more atmospheric noise than a high Q narrow band loopstick. Notice how the atmospheric noise (mostly from lightning) increases dramatically as the frequency goes down: <https://en.wikipedia.org/wiki/Atmospheric_noise> <https://en.wikipedia.org/wiki/Atmospheric_noise#/media/File:Atmosphericnoise.PNG> Of course, there's a limit to how small a practical loopstick can be built. Mostly, the size of the wire to wind the loopstick, its resistance, and the characteristics of the ferrite material, set the lower limit. The loopsticks can be made smaller, if you can afford the fine wire needed to get enough turns. There's also an upper limit to the size of the loopstick. It's possible to have such a high Q, that the bandwidth of the WWVB signal (about 5Hz) will not fit within the loopstick bandwidth. Temperature and mechanical stability will also be a problem with very high Q loopsticks. Orientation sensitivity also becomes somewhat of a problem. -- Jeff Liebermann jeffl@cruzio.com 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
| Jeff Liebermann <jeffl@cruzio.com>: Nov 30 07:45AM -0800 On Tue, 29 Nov 2016 22:30:26 -0800, "Stephen H. Fischer" >One thing about cataract sugary, do not delay it. Your eyesight may get >worse at an increasing faster rate, I was almost blind even with one good >eye as the old eye was so bad. Thanks. I'm 68 solar revolutions old, so that's a real possibility. No sign of cataracts, but I'm borderline with glaucoma. Some of my friends have had cataract surgery and opted for strange combinations, such as one eye optimized for close work, and the other for distant and driving. They all say that it can be quite functional. Nobody mentioned color, but I'll ask. -- Jeff Liebermann jeffl@cruzio.com 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
| Jeff Liebermann <jeffl@cruzio.com>: Nov 30 07:48AM -0800 On Tue, 29 Nov 2016 20:34:42 -0800, Jeff Liebermann <jeffl@cruzio.com> wrote: >sources. Buy a 128Kbit/sec sound card or dongle. Download a copy of >SDR Sharp. Go noise hunting. I'm sure you'll find something you >didn't expect. Oops. That should be a 192KHz 24 bit sound card. -- Jeff Liebermann jeffl@cruzio.com 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
| N_Cook <diverse@tcp.co.uk>: Nov 30 11:57AM The god folk on s.e.d reckon 1.5V at 200KHz is what there should be as remnant signal after the L-C filter. So this is what I reckon happened. The 680nF of the L-C went ohmic (still measures variously 150 to 250ohm) and lost C so more 200KHz was passed to the zobel, not made for that level of 200KHz , one of the paired 4.7R solder points failed with all the heat , then the remaining 4.7R heated up even more. |
| You received this digest because you're subscribed to updates for this group. You can change your settings on the group membership page. To unsubscribe from this group and stop receiving emails from it send an email to sci.electronics.repair+unsubscribe@googlegroups.com. |
No Response to "Digest for sci.electronics.repair@googlegroups.com - 5 updates in 3 topics"
Post a Comment