Re: [drakelist] Soft start solution for 110v operation
Jim Shorney [EMAIL PROTECTED] made an utterance to the drakelist gang -- On Thu, 15 Dec 2005 10:03:59 -0500 (EST), [EMAIL PROTECTED] wrote: My only concern with thermisters is they increase HV transformer primary winding ESR and slop the HV regulation. At 50W load for a typical R-4 the voltage drop by the thermister probably isn't much, but 400W load for the AC-4 would probably reach the maximum permissible 10% voltage drop range adding to frequency drift during key down. 100VAC is too low methinks ;-) I experimented with one of them for feeding my AC-4/T-4XB and the panel lights dimmed enough to make me nervous with 80W PEP CW output. How much dimming effect on the panel lights do you notice with the part you used? I may have one that isn't suited for that much current draw. There didn't seem to be any abnormal dimming, from what I could tell. I just used the twins in the 10 Meter contest and got good preformance without any apparent problems. If voltage drop is a concern, a small relay with an R/C time delay could be added to short out the limiter after it has done it's job. The upside to the relay method is that the limiter would return to cold and be ready to do it's job again if you have a momentary power interruption. OTOH, it can be argued that with line voltages being higher these days, a little extra voltage drop in the primary circuit may not be a bad thing. I was looking at some that were sized appropriatly for my L4B, but I haven't done the math and that project got put on the back burner. 73 Jim -- Jim Shorney --.--Put complaints in this box jshorney (at) inebraska.com Ham Radio NU0C Lincoln, NE, USA EN10ps http://incolor.inetnebr.com/jshorney/ -- Submissions:drakelist@www.zerobeat.net Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] Soft start solution for 110v operation
R.van Trotsenburg [EMAIL PROTECTED] made an utterance to the drakelist gang -- Hi, I use the trick with the relay over the termister successful in my SB1000 amplifier already for a long time. As soon as the 12V from the power supply comes up it actuates the relay and shorts out the thermister. I my QRL we use this as well in large power supplies, to protect the mains if multiple units are switched on simultaneous. 73 Rien PA0TRT Message text written by Jim Shorney Jim Shorney [EMAIL PROTECTED] made an utterance to the drakelist gang -- On Thu, 15 Dec 2005 10:03:59 -0500 (EST), [EMAIL PROTECTED] wrote: My only concern with thermisters is they increase HV transformer primary winding ESR and slop the HV regulation. At 50W load for a typical R-4 the voltage drop by the thermister probably isn't much, but 400W load for the AC-4 would probably reach the maximum permissible 10% voltage drop range adding to frequency drift during key down. 100VAC is too low methinks ;-) I experimented with one of them for feeding my AC-4/T-4XB and the panel lights dimmed enough to make me nervous with 80W PEP CW output. How much dimming effect on the panel lights do you notice with the part you used? I may have one that isn't suited for that much current draw. There didn't seem to be any abnormal dimming, from what I could tell. I just used the twins in the 10 Meter contest and got good preformance without any apparent problems. If voltage drop is a concern, a small relay with an R/C time delay could be added to short out the limiter after it has done it's job. The upside to the relay method is that the limiter would return to cold and be ready to do it's job again if you have a momentary power interruption. OTOH, it can be argued that with line voltages being higher these days, a little extra voltage drop in the primary circuit may not be a bad thing. I was looking at some that were sized appropriatly for my L4B, but I haven't done the math and that project got put on the back burner. 73 Jim -- Submissions:drakelist@www.zerobeat.net Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] Soft start solution for 110v operation
[EMAIL PROTECTED] made an utterance to the drakelist gang -- Various sizes of inrush limiters are available from RF Parts... -- Submissions:drakelist@www.zerobeat.net Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] Soft start solution for 110v operation
[EMAIL PROTECTED] made an utterance to the drakelist gang -- On Wed, 14 Dec 2005, Jim Shorney wrote: All this is partially moot until he's accepting orders but i'd like to prepare now - i'm open to other soft start inrush limiter ideas as well. You can use NTC (negative temperature coefficient) inrush limiters such as what is used in virtually every PC power supply these days - they usually look like a big black ceramic capacitor. The ones in PC power supplies are sized just about right for tube amatuer gear actually; I My only concern with thermisters is they increase HV transformer primary winding ESR and slop the HV regulation. At 50W load for a typical R-4 the voltage drop by the thermister probably isn't much, but 400W load for the AC-4 would probably reach the maximum permissible 10% voltage drop range adding to frequency drift during key down. 100VAC is too low methinks ;-) I experimented with one of them for feeding my AC-4/T-4XB and the panel lights dimmed enough to make me nervous with 80W PEP CW output. liberated one from a dead PC supply and installed it in my AC4, and there was a noticable reduction in the turn-on thump. How much dimming effect on the panel lights do you notice with the part you used? I may have one that isn't suited for that much current draw. Hopefully Harbach will be accepting orders soon - a few of those SS-100 jobs will make my day! -- 73 Jason N1SU http://n1su.com/ -- Submissions:drakelist@www.zerobeat.net Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
[drakelist] Soft start solution for 110v operation
Jason Buchanan [EMAIL PROTECTED] made an utterance to the drakelist gang -- hi, I've looked at Harbach's SS-100 with interest but i'm wondering how I could put this to use for 110v operation? I want to put a 110v switched outlet in a metal box (you've seen these before, a single 110V outlet with an ordinary-looking switch where the 2nd outlet would be) and use the switch to power on/off the rig. Preferably I'd like to put two switched outlets in a single box (like a 4 outlet box) so I could have the receiver on one switch and the transmitter on the other switch. But i'm not entirely clear how I would do this with the Harbach SS-100. Can I run the neutral direct to the radio and put the SS-100 in series (C to A) across the hot 110V phase? All this is partially moot until he's accepting orders but i'd like to prepare now - i'm open to other soft start inrush limiter ideas as well. 73 Jason N1SU -- Submissions:drakelist@www.zerobeat.net Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] Soft start solution for 110v operation
Jim Shorney [EMAIL PROTECTED] made an utterance to the drakelist gang -- On Wed, 14 Dec 2005 18:07:50 -0500, Jason Buchanan wrote: All this is partially moot until he's accepting orders but i'd like to prepare now - i'm open to other soft start inrush limiter ideas as well. You can use NTC (negative temperature coefficient) inrush limiters such as what is used in virtually every PC power supply these days - they usually look like a big black ceramic capacitor. The ones in PC power supplies are sized just about right for tube amatuer gear actually; I liberated one from a dead PC supply and installed it in my AC4, and there was a noticable reduction in the turn-on thump. There was a nice writeup on these on one of the R390A websites. Look here: http://www.skirrow.org/Boatanchors/TechTalk3.pdf -- Jim Shorney --.--Put complaints in this box jshorney (at) inebraska.com Ham Radio NU0C Lincoln, NE, USA EN10ps http://incolor.inetnebr.com/jshorney/ -- Submissions:drakelist@www.zerobeat.net Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
