from FB group Building Transistor Radios 2018-12-14 A voice band filter for telecomm or radio comm. The .068 or .0068 uF caps can be made by putting a 0.1 and 0.22 or .01 and .022 uF capacitors in series. The opamp can be a 1458 ‘dual 741’ opamp.
Archive for the ‘Telephone’ Category:
2018-11-20 Solder V. IDC Punchdown
from FB group Bell Telephone… 2018-11-22 Happy Turkey day! I use solder all the time, and I trust it as long as it’s done properly. But one thing I learned in my decades of telephone work is that the wiring systems the telcos developed were tested and proven before they were deployed, and they were
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2018-10-24 The AT&T L.D. Network Crashed 1990
The article about the system crash. As was stated in the article, C is not as structured as some other languages, which may allow the programmer to write code that has unintended consequences. Jay Neale said ‘C is very unforgiving.’ But C allows you to do things with the implication that you know what you’re
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2018-08-31 An Old Software Saying
From FB group Bell Telephone… 2018-08-31 Gary Stoutenburg I love that comparison. 👍 There’s an old IT adage: “The first 90% of the software takes 10% of the time. The last 10% of the software takes 90% of the time.” The user interface is a big time and money sink, so a lot of corner
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2018-07-28 New?? Cisco Phone Set
From FB group Bell Telephone… Steve Hart I used to do a shenanigan when we had a Cisco IP phone die. If the ‘factory reset’ didn’t cure the problem, with the help of the ladies, I would give a ‘new’ phone to the client. I would make sure the phone, especially the handset, was cleaned
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2018-06-22 Telco Craftspeople
From FB group Bell Telephone… As a customer and the point man who interfaced with the Telco, I have nothing but good to say about all the fine craftspeople I dealt with during my 33 years with the college district. I only wish I could have spoken as highly of other contractors I had to
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2018-06-22 RJ-31X, How To And How Not To!
From FB group Bell Telephone … I agree. The upside of splitting before is that it won’t interrupt the DSL. The downside is that if there is a failure (loss of continuity or blown fuse) in the splitter, the alarm may never make a call. Most of the alarm panels we had at the college
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2018-05-06 Telephone Hybrid Coil Schematics
This is a link to telecomm information on Tomi Engdahl’s epanorama.net. http://www.epanorama.net/circuits/teleinterface.html#hybrid
2018-04-06 Stopping Telemarketer calls
From FB group Bell Telephone of the… It’s possible [to stop telemarketing calls]. There are some gotchas, though. One I see is a nonselective rejection of unknown incoming calls is the emergency services, etc., wouldn’t be able to contact you. If the school had a threat and had to call parents, they would be blocked.
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2018-03-14 Switchboard 714-262-1135
This number was most likely from the time when the 714 area code covered the area outside of LA, including all of Southern California San Diego county and east, Riverside County, San Bernardino County, and the east side of the Sierras all the way up to Inyo. I remember that no prefix in Orange County
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