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Total 10 documents matching your query.

1. [Towertalk] Relay Summary (score: 1): Author: gjerning@flash.net (ARNE GJERNING); Date: Tue, 26 Mar 2002 21:47:08 -0700; Not a lot of responses to my query about open frame relays but I will pass what info I received. 1. Use Dow Key relays (remember the 1 inch square about 3 inch long ones of yester year?) 2. Use vacuu; /archives//html/Towertalk/2002-03/msg00713.html (8,381 bytes)
2. [Towertalk] Relay Summary (score: 1): Author: jirka@jimaz.cz (Jiri Sanda); Date: Thu, 28 Mar 2002 00:55:22 +0100; Hi Arne, I have to strongly disagree on the biggest problem - biggest problem is to have good contact on receive. All the HighPower realys does not guarantee conection below 1mA or even 10mA. Check t; /archives//html/Towertalk/2002-03/msg00726.html (10,851 bytes)
3. [Towertalk] Relay Summary (score: 1): Author: brewerj@squared.com (brewerj@squared.com); Date: Thu, 28 Mar 2002 10:02:03 -0500; jirka@jimaz.cz mentions: Just about every old high power used a dow key relay , or some type of open frame DPDT relay, and I doubt those were gold plated. I certainly have not noticed any deteriorati; /archives//html/Towertalk/2002-03/msg00735.html (7,821 bytes)
4. [Towertalk] Relay Summary (score: 1): Author: cdietz@swbell.net (Logan Dietz); Date: Thu, 28 Mar 2002 10:26:22 -0600; I have used all kinds of relays from Radio Shack to surplus. If you use DPDT at least 10 amp contacts and parallel the contacts, I have not noticed any deterioration. Occasionally there will be a pro; /archives//html/Towertalk/2002-03/msg00737.html (7,604 bytes)
5. [Towertalk] Relay Summary (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Thu, 28 Mar 2002 10:48:13 -0800; I believe that one of the most important factors involved in small signal switching has not been addressed. That is the mechanical nature of the relay contact assembly. Some relays are designed so th; /archives//html/Towertalk/2002-03/msg00738.html (9,860 bytes)
6. [Towertalk] Relay Summary (score: 1): Author: w5kp@swbell.net (Jerry Kincade); Date: Thu, 28 Mar 2002 13:12:10 -0800; Ma Bell used that principle with what was called "sealing current" to help keep their gazillion relays working for many, many years. Now, of course, it's all digital switches in the central office, b; /archives//html/Towertalk/2002-03/msg00740.html (8,243 bytes)
7. [Towertalk] Relay Summary (score: 1): Author: w9jcc@juno.com (Frank C Travanty); Date: Thu, 28 Mar 2002 14:17:19 -0800; I have been using the Dow Key Series 71 (6 pos) and Series 72 (3 pos) since the mid 60's as remote switches (one or the other of them has been at the top of the tower since 1968), with no problems on; /archives//html/Towertalk/2002-03/msg00742.html (9,222 bytes)
8. [Towertalk] Relay Summary (score: 1): Author: W9IXX@arrl.net (Philip Florig); Date: Thu, 28 Mar 2002 15:48:09 -0600; Hi, This is right. The wipe of the contacts is important to the breaking of the oxide coat. One should consider also the function of the relay as to whether it is used in a load or non-load break sit; /archives//html/Towertalk/2002-03/msg00743.html (11,861 bytes)
9. [Towertalk] Relay Summary (score: 1): Author: norsan@bright.net (Norman Hockler); Date: Thu, 28 Mar 2002 19:55:04 -0500; Antenna change over relays must use a "noble" metal to insure contact wetting. Silver, palladium, or gold. Some relays used a wiping action but this is not a reliable substitute for wetting. Norm N8N; /archives//html/Towertalk/2002-03/msg00746.html (8,440 bytes)
10. [Towertalk] Relay Summary (score: 1): Author: eric@k3na.org (Eric Scace K3NA); Date: Fri, 29 Mar 2002 23:26:42 -0500; Actually, "sealing current" was not used for relay contacts. Sealing current is still used today, in the time of digital telephone switches (with no relays). One evening over coffee at a technical st; /archives//html/Towertalk/2002-03/msg00777.html (10,610 bytes)

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