Re: [Elecraft] 14.9V to KX1?
I think you're giving too little thought to the quality of your power supplies. Jim, Not at all - and this kind of comment is exactly why I posted - thanks. Lower weight is only part of the equation, and I recognize that - I'm new at this game and still trying to understand all the tradeoffs. Suffice it to say that I'll be looking for a small regulated switcher at the local surplus place, because I think that is more what I want (I'll take my KX-1 along and listen for noise...) 73 de chris K6DBG ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] 14.9V to KX1?
X!!! kX1!! As Miss Natatile Latilla used to say.Never mind. Sorryit's 5:45AM and not quite up yet. - Original Message - From: Tom Althoff [EMAIL PROTECTED] To: elecraft@mailman.qth.net Sent: Tuesday, January 10, 2006 5:40 AM Subject: Re: [Elecraft] 14.9V to KX1? Hi Chris - My K1 manual says 8.5 to 15. You should be safe. I am running a Toshiba laptop switching supply which is rated at 15VDC ouput to run my K1. I see 14.8VDC on my K1's BAT indicator. 73 de Tom K2TA - Original Message - From: Chris Kantarjiev [EMAIL PROTECTED] To: elecraft@mailman.qth.net Sent: Tuesday, January 10, 2006 12:34 AM Subject: [Elecraft] 14.9V to KX1? In my quest to get a lighter/smaller power supply for my KX-1, I found a wallwart in my junk box. Says 12V, 1A. Actually puts out 14.9V according to the KX-1's 'bat' display. Specs call for 7-14v. Am I risking damage by exceeding that? It looks like D2/D3 (1N5817) are prepared to block 20V reverse. I can keep looking; I'm mostly 'just wondering'. It's kind of heavy, anyway (I'm sure it's a linear, not switcher, which is, of course, a mixed blessing.) Thanks. 73 de chris K6DBG ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] 14.9V to KX1?
Be sure to double-check both the no-load and loaded voltage output... it may be much greater a difference than you wish to work with. Ah, good catch Tom - it drops to under 13V under Tx load. I'll look for something else. I'd like to find a little laptop supply, but they tend to be higher current these days - trying to pare down my weight for the Spartan Sprint :-) 73 de chris K6DBG ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] 14.9V to KX1?
Chris et al: I know there is a lot bad said about switching power supply noise, but I've been using little 12V 4A switchers for a couple of years now and have never found noise a problem. Actually, I work in the electronics industry and have collected a number of these from several suppliers and have had no problems with any of them that I can recall. Typically these power supplies are a little bigger than a bar of soap and have an IEC power connector on one end and an output cable on the other. They are all switchers, and as mentioned are rated at 12V 4A output. They work great on the K2 and my SG-2020 running up to 12W or so output, possibly more. Regulation is pretty good ... typically better than 1/2 volt from receive to key-down. The latest batch I got are from Delta Electronics in China and are fully shielded with input and output RFI filtering including a ferrite core on the output cable just before the coaxial connector. These are all FCC Class B devices. Several even ha d exactly the right connector to plug right into the K2. Look around on surplus sites ... you can probably find plenty of these. The coaxial connector you want is 5.5mm outside, 2mm inside. If you buy one and find it noisy, you can bash me on this reflector but I've had no problems. If your shack is very near your antenna you may have more problems. My antennas are high (around 60') and my radios are in the basement, so there is good isolation between the power supply and the antennas. The All Electronics CAT# PS-1231 looks like it would work but you will have to change the connector. My point is, don't discount the little switchers. They're cheap, universal input (100 - 264 VAC, work anywhere in the world), small and light. If nothing else, good to have for travel. regards, Jim -- Original message -- From: Chris Kantarjiev [EMAIL PROTECTED] Be sure to double-check both the no-load and loaded voltage output... it may be much greater a difference than you wish to work with. Ah, good catch Tom - it drops to under 13V under Tx load. I'll look for something else. I'd like to find a little laptop supply, but they tend to be higher current these days - trying to pare down my weight for the Spartan Sprint :-) 73 de chris K6DBG ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] 14.9V to KX1?
[EMAIL PROTECTED] wrote: If your shack is very near your antenna you may have more problems. My antennas are high (around 60') and my radios are in the basement, so there is good isolation between the power supply and the antennas. This is the key point! Your antennas are probably fed with coax with baluns if needed, or properly installed balanced line. In my opinion, most problems with switcher noise are caused by the noise energy being conducted to the 'ground' of the AC line, then flowing along the feedline in common mode, and then getting picked up by the antenna. Noise energy can also be radiated by house wiring, etc. Things like verticals near the house, random wires, etc. are problematic for use with switchers (or around computers, etc.). -- 73, Vic, K2VCO Fresno CA http://www.qsl.net/k2vco ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] 14.9V to KX1?
Hi, Chris. Ah, good catch Tom - it drops to under 13V under Tx load. I'll look for something else. 13V is still well within the specified range. As long as that 13V is developing enough RF does it matter that its 2V below the RX voltage? If it were dropping to 7V on transmit I'd be more worried :) - Martin. ___ To help you stay safe and secure online, we've developed the all new Yahoo! Security Centre. http://uk.security.yahoo.com ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
