The Alpha 86 has a 10K resistor on the input of a cmos nand gate. So pulling that to ground is simple...and well within the K3s 200 V/5 A specs.
Chuck Jack Hawley KE9UW Sent from my iPhone, cjack > On Dec 7, 2019, at 2:32 AM, Roger <[email protected]> wrote: > > > No problem with the ALPHA amplifiers - the switching voltage is approx. 24 V > @ 350 mA. The K3S MOSFET switch will switch up to 200 V (absolute MAX.!) and > several amperes................. > > But to make sure connect a voltmeter to the PTT socket on the amp and > measure the voltage then switch to current measurement and switch the > amplifier to TX with the multimeter. If both readings (voltage and current) > are within limits then you are absolutely safe! > > 73 Roger, DL5RBW > > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of DC > Sent: Saturday, December 07, 2019 6:28 AM > To: [email protected] > Subject: Re: [Elecraft] K3S driving an Alpha 86 > > I have used a K3 with an Alpha 76, 78 and 77DX. > >> On 12/6/2019 8:08 PM, Bob McGraw K4TAX wrote: >> Sorry Vic, I had a different manufacturer manual in front of me trying to > assist another ham with his radio and amp connection. >> >> Bob, K4TAX >> >> >> Sent from my iPhone >> >>> On Dec 6, 2019, at 9:45 PM, Victor Rosenthal 4X6GP <[email protected]> > wrote: >>> >>> >>> ______________________________________________________________ >>> Elecraft mailing list >>> Home: http://mailman.qth.net/mailman/listinfo/elecraft >>> Help: http://mailman.qth.net/mmfaq.htm >>> Post: mailto:[email protected] >>> >>> This list hosted by: http://www.qsl.net Please help support this >>> email list: http://www.qsl.net/donate.html Message delivered to >>> [email protected] >>> >> >> ______________________________________________________________ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:[email protected] >> >> This list hosted by: http://www.qsl.net Please help support this email >> list: http://www.qsl.net/donate.html Message delivered to >> [email protected] > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html Message > delivered to [email protected] > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [email protected] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
