Re: [Elecraft] [MM] W2 review
Thanks for the report Ken, I am afraid I don't see a need for one of Rose's covers for it. I am waiting for an uncommitted sensor so I can measure high power at VHF and above. Regarding powering: My K3 12V output powers an automotive relay (+diode) which connects the 12V PSU to an 8 way powerpole panel. This allows me to control the power to the LP-100A, the transverters, the KRC2 and an AT-1000pro with the K3 power switch. Mike -- View this message in context: http://n2.nabble.com/W2-tp4000196p4003512.html Sent from the [MM] mailing list archive at Nabble.com. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] [MM] W2 review
How is the display on the computer? The LED display is fine but I really bought the W2 (mine is on the way) to be able to use the higher resolution display on my computer. AD6XY wrote: > > Thanks for the report Ken, I am afraid I don't see a need for one of > Rose's covers for it. I am waiting for an uncommitted sensor so I can > measure high power at VHF and above. > > Regarding powering: > > My K3 12V output powers an automotive relay (+diode) which connects the > 12V PSU to an 8 way powerpole panel. This allows me to control the power > to the LP-100A, the transverters, the KRC2 and an AT-1000pro with the K3 > power switch. > > Mike > -- View this message in context: http://n2.nabble.com/W2-tp4000196p4005933.html Sent from the [MM] mailing list archive at Nabble.com. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] [MM] W2 review
Now that's a good idea. Why the diode? 73 de M0XDF, K3 #174 -- The soul is the same in all living creatures, although the body is different. -Hippocrates, physician (460-c.377 BCE) On 14 Nov 2009, at 08:31, AD6XY wrote: > My K3 12V output powers an automotive relay (+diode) which connects > the 12V > PSU to an 8 way powerpole panel. This allows me to control the power > to the > LP-100A, the transverters, the KRC2 and an AT-1000pro with the K3 > power > switch. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] [MM] W2 review
When the relay solenoid's magnetic field collapses when power is removed it will produce a sizeable reverse-polarity surge at the 12V connector. A diode across the leads oriented to it is normally reverse polarity (anode to ground, cathode to +) will conduct when that surge occurs and keep most of it from reaching the K3. Depending upon the inductance of the solenoid that surge can be quite large, producing many times the 12 V that was applied with rather large current for a brief interval. It's important to choose a diode that can handle those surges without failing. Power supply diodes are a good bet for a fairly heavy duty relay. Ron AC7AC -Original Message- Now that's a good idea. Why the diode? 73 de M0XDF, K3 #174 -- On 14 Nov 2009, at 08:31, AD6XY wrote: > My K3 12V output powers an automotive relay (+diode) which connects > the 12V > PSU to an 8 way powerpole panel. This allows me to control the power > to the > LP-100A, the transverters, the KRC2 and an AT-1000pro with the K3 > power > switch. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] [MM] W2 review - and why the diode...
Hello David Why the diode? Well, any relay driven by a solid-state device should have a diode across its coil (in reverse polarity!) to short reverse voltage spikes. Transistor are rather fast switches... and such spikes would damage them. Never drive a relay from a transistor or IC without such a parallel diode! 73 Richard - HB9ANM David Ferrington, M0XDF wrote: > > Now that's a good idea. Why the diode? > 73 de M0XDF, K3 #174 > -- > The soul is the same in all living creatures, although the body is > different. -Hippocrates, physician (460-c.377 BCE) > > On 14 Nov 2009, at 08:31, AD6XY wrote: > >> My K3 12V output powers an automotive relay (+diode) which connects >> the 12V >> PSU to an 8 way powerpole panel. This allows me to control the power >> to the >> LP-100A, the transverters, the KRC2 and an AT-1000pro with the K3 >> power >> switch. > > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > > - Richard - HB9ANM -- View this message in context: http://n2.nabble.com/W2-tp4000196p4014449.html Sent from the [MM] mailing list archive at Nabble.com. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
