om2500a
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Hi Folks,
I have recently purchased the OM2500A amplifier but am confused about the lead I need to make up for connection to the amplifier. The OM Amp has a 15way D 2 row connector and the Elecraft K3 has a 15way D 3 row connector. I have the screened cable and the correct plugs etc but am unsure of the terminology used in the two manuals as to what wires go where, and as you can imagine, am a little worried about how to connect them. The OM Power pin out is as follows: 1:ALC Out 2:NC 3:Inhibit Control Voltage 4:TX Inhibit for Yaesu and Elecraft - this supersedes ALC output 5:NC 6:Key Out 7:NC 8:Key in 9:- 15:Ground I have not listed the pin out of the K3 as I assume anyone with a common interest will have the manual. I would be most grateful if someone would Elmer me here because 232 coms is simple provided the terminology used is the same. Elecraft us a whole different list of Pin outs on their socket on the back of the K3, and I don't want to get it wrong. If anyone would like to help me off-list my e-mail address is [hidden email] Thanks for reading and hopefully helping, best of 73 Chris --- This email is free from viruses and malware because avast! Antivirus protection is active. http://www.avast.com ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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Hi Chris,
Am no expert (have no k3 and no om2500a) but I was courious and checked both manuals. My understanding is that you (or Elecraft) don't "want" the ALC and the keying of the amp is not done via Elecraft's PIN 10. So, you would key the amp via the Keyout jack of the K3, connect amp's pin 4 to Elecraft's Pin 7 (tx inh), amp's pin15 to Elecraft's pin 5 (gnd) and that's it?. You will have to turn on the tx inh in the menu of the K3. Maybe that is identical to your own guess or someone on the list can confirm this. Greetings Ralf, DL6OAP Am 15.12.2013 um 15:47 schrieb "Chris Pickett" <[hidden email]>: > Hi Folks, > I have recently purchased the OM2500A amplifier but am confused about the > lead I need to make up > for connection to the amplifier. > The OM Amp has a 15way D 2 row connector and the Elecraft K3 has a 15way D 3 > row connector. I have the screened cable and the correct plugs etc but am > unsure of the terminology used in the two manuals as to what wires go where, > and as you can imagine, am a little worried about how to connect them. > > The OM Power pin out is as follows: > > 1:ALC Out > 2:NC > 3:Inhibit Control Voltage > 4:TX Inhibit for Yaesu and Elecraft - this supersedes ALC output > 5:NC > 6:Key Out > 7:NC > 8:Key in > 9:- > 15:Ground > > I have not listed the pin out of the K3 as I assume anyone with a common > interest will have the manual. > > I would be most grateful if someone would Elmer me here because 232 coms is > simple provided the terminology used is the same. Elecraft us a whole > different list of Pin outs on their socket on the back of the K3, and I > don't want to get it wrong. > > If anyone would like to help me off-list my e-mail address is > [hidden email] > > Thanks for reading and hopefully helping, > > best of 73 > Chris > > > > > --- > This email is free from viruses and malware because avast! Antivirus protection is active. > http://www.avast.com > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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Just noticed that OMPower recommend using the ALC if duty cycle is high (but don't have it in their illustration)
So, better connect amps pin 1 and k3's pin 15 (ALC) and turn on ext alc in K3's menu... ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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From OM Power manual: "We only recommend using ALC feature while
operating RTTY, FM and other 100% duty modes." I don't think they are recommending to use ALC for those modes. This means DON'T use ALC for CW or SSB. Since the only valid purpose is to reduce drive power in a fault condition, TX INHIBIT is the correct choice. 73, Josh W6XU On 12/15/2013 10:59 AM, Ralf Wilhelm wrote: > Just noticed that OMPower recommend using the ALC if duty cycle is high (but don't have it in their illustration) > So, better connect amps pin 1 and k3's pin 15 (ALC) and turn on ext alc in K3's menu... > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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Hi Josh,
I think you are right, am no native english speaker but I think that is the better way to read it. In my understanding, the main purpose of the ALC is to reduce the power drive to keep the plate oder grid currents from being driven into the non-linear region in order to prevent non-linear distortions (splatter, harmonics). Maybe the levels are such that, with ALC on, the drive power would already be reduced before the max. output power is reached? This would explain the recommendation (in your reading) if the main limitation is a "thermal" one instead of a "non-linear" one. Vy 73 Ralf, DL6OAP ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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There seem to be more than version of the manual around. "Mine" is from "radiomanuals.com" (I think so) and just checked; it doesn't not have the word "only" in the ALC description on page 8.
So, the basic line is NO ALC for ssb,cw... Actually I hope Chris will show up again because I got an off-the-list respond yesterday from him, and he described another task much more interesting: he wants to use the automatic features of the amplifier. He uses the rs232 port of amp and K3, but this solution blocks the K3's rs232 and keeps him from using a computer control for the K3 when the amplifer is off. I think, a solution would be a small box that reads the band settings from the K3's ACC jack, converts it into "comport format" and sends it to the amplifer. Maybe there is a PIC solution for this... ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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