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1. [Amps] open frame relay rating (score: 1): Author: "Steve Flood" <kk7uv@bresnan.net>; Date: Sat, 29 Mar 2008 09:54:22 -0600; I have several open-frame relays. If I use one for the T/R relay, what should the contact rating be for a 1500w amp? Is it as simple as 1500w / 50 ohms = SQRT of 30A or 5.5 Amps? Tnx, Steve, KK7UV __; /archives//html/Amps/2008-03/msg00339.html (6,546 bytes)
2. Re: [Amps] open frame relay rating (score: 1): Author: Pat Barthelow <aa6eg@hotmail.com>; Date: Sat, 29 Mar 2008 10:06:09 -0700; Hello Steve, There have been extensive past discussions on high power relays, in RF Amp service, on this reflector. I think consensus was that contact ratings of ordinary relays, were often for DC or; /archives//html/Amps/2008-03/msg00340.html (9,037 bytes)
3. Re: [Amps] open frame relay rating (score: 1): Author: "jeremy-ca" <km1h@jeremy.mv.com>; Date: Sat, 29 Mar 2008 13:34:03 -0400; Many amps used open frame relays with 10-13A contacts and they worked well at 1500W. The one issue with them is high VSWR in the thru position on 10M which can fold back the power in a SS rig. The cu; /archives//html/Amps/2008-03/msg00342.html (8,043 bytes)
4. Re: [Amps] open frame relay rating (score: 1): Author: "Steve Flood" <kk7uv@bresnan.net>; Date: Sat, 29 Mar 2008 12:31:29 -0600; Thanks Carl and others for the replies. I don't plan to use this amp above 20m actually. One of my relays is very similar to the SB-220 relay - and thinking I'd use the same setup with a third pole f; /archives//html/Amps/2008-03/msg00344.html (9,042 bytes)
5. Re: [Amps] open frame relay rating (score: 1): Author: "jeremy-ca" <km1h@jeremy.mv.com>; Date: Sat, 29 Mar 2008 14:38:11 -0400; Yes, those are "enclosed" open frame relays. The SB-220 relay is excellent and very reliable considering how many still see daily use after 30-40 years. Ive never got close to that with a vacuum rela; /archives//html/Amps/2008-03/msg00345.html (9,671 bytes)
6. Re: [Amps] open frame relay rating (score: 1): Author: "Dan Hearn" <dhearn@air-pipe.com>; Date: Sat, 29 Mar 2008 12:25:05 -0700; Carl, what problems have you had with vac relays? Open coils? Loss of vacuum? contact problems? 73, Dan, N5AR Yes, those are "enclosed" open frame relays. The SB-220 relay is excellent and very relia; /archives//html/Amps/2008-03/msg00346.html (10,783 bytes)
7. Re: [Amps] open frame relay rating (score: 1): Author: "jeremy-ca" <km1h@jeremy.mv.com>; Date: Sat, 29 Mar 2008 16:02:38 -0400; Contact problems, usually during a contest or a long aggravating CW pileup. Im on my 3rd or 4th relay since new. Since the amp is only a LK-500ZC it isnt excessive RF and Ive never used QSK. Ive also; /archives//html/Amps/2008-03/msg00348.html (12,060 bytes)

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