Re: [Elecraft] K3: reverse 12 volt supply

| > | View on www.westmarine.com | Preview by Yahoo | > | | > | | > > > > I am sure other marine supply houses do also. > Mel, K6KBE > > From: Bob McGraw - K4TAX <rmcg...@blomand.net> > To: elecraft@mailman.qth.net > Sent: Wednesday, Septembe

Re: [Elecraft] K3: reverse 12 volt supply

Thanks for all the replies with sources to find stranded, paired wire. I saved them all. My sources suddenly quit. I feared the wire mfg's may have gone off-shore, and I might have to use pastel colors (tic). And finally, FWIW, it seems someone is using my callsign. If you Google it, you

Re: [Elecraft] K3: reverse 12 volt supply

I checked the rolls of wire at the shop. I find I have two different ones: Belden # 8720 - 14 AWG stranded (19x27) TC conductors, polyethylene insulation, twisted pair, overall Beldfoil® shield (100% coverage), 16 AWG stranded TC drain wire, PVC jacket. Belden # 8718 - 12 AWG stranded

Re: [Elecraft] K3: reverse 12 volt supply

15 1:49 PM Subject: Re: [Elecraft] K3: reverse 12 volt supply I checked the rolls of wire at the shop.  I find I have two different ones: Belden # 8720 - 14 AWG stranded (19x27) TC conductors, polyethylene insulation, twisted pair, overall Beldfoil® shield (100% coverage), 16 AWG strande

Re: [Elecraft] K3: reverse 12 volt supply

Just take zip cord from Powerwerx or Wireman, clamp one end in a vice and the other in a drill, pull back tight and let the drill do the twisting. Now you have the best of both worlds.what ever "best" happens to be. Belden makes a cable, grey jacket, inside is a foil shield with

Re: [Elecraft] K3: reverse 12 volt supply

] On Behalf Of Robin Moseley Sent: Tuesday, September 15, 2015 5:31 PM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] K3: reverse 12 volt supply as the cables are side by side and very close.. twisting won't make an iota of difference. you are wasting your time twisting the wires.. If you need

Re: [Elecraft] K3: reverse 12 volt supply

That would work for stuff that doesn't move much. I should do that for a lot of my soon to be rewired fixed operating position. But 7 wire stranded THHN is still not rated for normal flexing or vibration. That's the zip cord with fine stranded wire. I think that making the last six inches to a rig

Re: [Elecraft] K3: reverse 12 volt supply

Dick, The Wireman and several other wire distributors have red/black zip cord in a variety of sizes from #24 to #10. The #12 power wire that is supplied by Elecraft for the K3/K3S and several other legacy kits is the red/black type. 73, Don W3FPR On 9/15/2015 1:49 PM, Richard Fjeld wrote:

Re: [Elecraft] K3: reverse 12 volt supply

Powerwerx has red/black zip cord from 24 gauge to 2 gauge. http://www.powerwerx.com/wire-cable/red-black-zip-cord.html wunder K6WRU CM87wj http://observer.wunderwood.org/ (my blog) > On Sep 15, 2015, at 11:22 AM, Don Wilhelm

Re: [Elecraft] K3: reverse 12 volt supply

On Tue,9/15/2015 11:55 AM, Walter Underwood wrote: Powerwerx has red/black zip cord from 24 gauge to 2 gauge. Zip cord is NOT good for ANY application, because it is inherently susceptible to RFI. TWISTED PAIR is FAR better, because it inherently rejects interference from low audio

Re: [Elecraft] K3: reverse 12 volt supply

Subject: Re: [Elecraft] K3: reverse 12 volt supply It was a passing thought as; how to use a diode without causing a voltage drop was the original question. AD5X has an OVP and Rev Polarity project on his website that would be better. I couldn't think of the call sign at the time, so I suggested

Re: [Elecraft] K3: reverse 12 volt supply

I don't know the details of the guys who had the reversals. I did a search for paired, stranded, two color wire for power lead use and didn't come up with much. Dick, n0ce On 9/15/2015 8:16 AM, Don Wilhelm wrote: But that does not match the markings on a battery which is usually marked with

Re: [Elecraft] K3: reverse 12 volt supply

But that does not match the markings on a battery which is usually marked with "+" at the positive terminal.:-) 73, Don W3FPR On 9/15/2015 8:14 AM, ae...@carolinaheli.com wrote: I have an idea. Why not color code the wires so we know which one is positive and which one is Ground (or neutral)

Re: [Elecraft] K3: reverse 12 volt supply

Try here: http://www.powerwerx.com/wire-cable/red-black-zip-cord.html 73, Tim - N3XX - Original Message - From: "Richard Fjeld" <rpfj...@outlook.com> To: <elecraft@mailman.qth.net> Sent: Tuesday, September 15, 2015 1:49 PM Subject: Re: [Elecraft] K3: reverse 12

Re: [Elecraft] K3: reverse 12 volt supply

Also all of the marine supply house carry color coded battery cables in a vinyl jacket.  Mel, K6KBE From: Don Wilhelm <w3...@embarqmail.com> To: elecraft@mailman.qth.net Sent: Tuesday, September 15, 2015 11:22 AM Subject: Re: [Elecraft] K3: reverse 12 volt supply

Re: [Elecraft] K3: reverse 12 volt supply

To: elecraft@mailman.qth.net Subject: Re: [Elecraft] K3: reverse 12 volt supply On Tue,9/15/2015 11:55 AM, Walter Underwood wrote: Powerwerx has red/black zip cord from 24 gauge to 2 gauge. Zip cord is NOT good for ANY application, because it is inherently susceptible to RFI. TWISTED PAIR is FAR

Re: [Elecraft] K3: reverse 12 volt supply

Good point. The original poster was asking for “paired” wire, which could be interpreted as zipcord. Twisted pair is better. Powerwerx also has separate red/black wire of various sorts, including extra-flexible and welding cable. http://www.powerwerx.com/wire-cable/

Re: [Elecraft] K3: reverse 12 volt supply

Tuesday, September 15, 2015 8:46 AM > To: ae...@carolinaheli.com; 'Richard Fjeld' <rpfj...@outlook.com>; 'Fred > Townsend' <fptowns...@earthlink.net>; elecraft@mailman.qth.net > Subject: Re: [Elecraft] K3: reverse 12 volt supply > > What an interesting idea. Wonder why t

Re: [Elecraft] K3: reverse 12 volt supply

Of Gary Sent: Tuesday, September 15, 2015 8:46 AM To: ae...@carolinaheli.com; 'Richard Fjeld' <rpfj...@outlook.com>; 'Fred Townsend' <fptowns...@earthlink.net>; elecraft@mailman.qth.net Subject: Re: [Elecraft] K3: reverse 12 volt supply What an interesting idea. Wonder why that ha

Re: [Elecraft] K3: reverse 12 volt supply

...@mailman.qth.net] On Behalf Of Gary Sent: Tuesday, September 15, 2015 8:46 AM To: ae...@carolinaheli.com; 'Richard Fjeld' <rpfj...@outlook.com>; 'Fred Townsend' <fptowns...@earthlink.net>; elecraft@mailman.qth.net Subject: Re: [Elecraft] K3: reverse 12 volt supply What an interesting idea

Re: [Elecraft] K3: reverse 12 volt supply

ot; <fptowns...@earthlink.net>; "elecraft@mailman.qth.net" <elecraft@mailman.qth.net> Subject: Re: [Elecraft] K3: reverse 12 volt supply I have an idea. Why not color code the wires so we know which one is positive and which one is Ground (or neutral) ? Maybe make the positi

Re: [Elecraft] K3: reverse 12 volt supply

[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Richard Fjeld Sent: Monday, September 14, 2015 1:01 AM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] K3: reverse 12 volt supply I would think you could wire a relay with a diode in the path to the coil so that it would not operate

Re: [Elecraft] K3: reverse 12 volt supply

t;; elecraft@mailman.qth.net Sent: Monday, September 14, 2015 3:13 PM Subject: Re: [Elecraft] K3: reverse 12 volt supply Dick: Relays? Sure, easy to do. Power relays are often used in many kinds equipment. They are sometimes called 'contactors'. They are either big and clunky or small and unreliable. Which

Re: [Elecraft] K3: reverse 12 volt supply

Fjeld' <rpfj...@outlook.com>; elecraft@mailman.qth.net Subject: Re: [Elecraft] K3: reverse 12 volt supply You guys are working too hard on this. Here goes: Take a bridge rectifier, preferably a Schottky with proper current and voltage rating. Tie the + to the radio + tie the - to the rad

Re: [Elecraft] K3: reverse 12 volt supply

It was a passing thought as; how to use a diode without causing a voltage drop was the original question. AD5X has an OVP and Rev Polarity project on his website that would be better. I couldn't think of the call sign at the time, so I suggested a relay. (I've worked with huge contactors

Re: [Elecraft] K3: reverse 12 volt supply

I would think you could wire a relay with a diode in the path to the coil so that it would not operate if the polarity of the power leads are reversed. That way, there would be negligible voltage drop when operated. Dick,n0ce On 9/13/2015 10:09 PM, Don Wilhelm wrote: The base K3 is

Re: [Elecraft] K3: reverse 12 volt supply

On 9/14/2015 2:42 PM, Roger D Johnson wrote: According to the schematic, there is a shunt diode on the PA board. Hopefully, it prevented the full 12 volts from appearing on the circuitry. The smoke probably came from the chokes ahead of the diode. 73, Roger On 9/13/2015 11:09 PM, Don

Re: [Elecraft] K3: reverse 12 volt supply

Ouch, sorry to hear that. If you are lucky it may have only blew a cap or possibly belted a trace. I would open it up and look at the PA deck to look for obvious damage. As far as future prevention, label clearly and double check.One thing I do not like on the K3 (and mosst radios that use

Re: [Elecraft] K3: reverse 12 volt supply

The base K3 is protected by an in-line diode that will not allow reverse voltage to flow. The same is not true of the KPA3 where the reduction in voltage would not be tolerable. The KPA3 is protected by a circuit breaker, but in this case did not trip in time to prevent damage. 73, Don W3FPR