Probably do not need pull-ups on the outputs. The KPA500 has pull-ups on its band inputs, with a series protective diode that isolates it from any external pull-ups. If you use the drivers with other equipment the pull-ups may be needed, but they should don’t be needed with just the KPA500.
73! Jack, W6FB > On Jan 16, 2021, at 5:44 PM, Joe Subich, W4TV <li...@subich.com> wrote: > > > > or alternatively has anyone designed something home brew to > > achieve the purpose. > > Takes nothing more than a 74LS147 and some pull up resistors > on the inputs and inverters (or open collector transistors with > pull ups) on the outputs. The Orion II band outputs are open > collector - maximum pull-up current is specified in the Orion II > manual. > > Everything you need to know to roll your own is in the 74LS147 > data sheet. > > 73, > > ... Joe, W4TV > > > On 2021-01-16 6:58 PM, Barry Simpson wrote: >> Gooday all >> I use my Ten Tec Orion II with my KPA500 and usually try to manually switch >> bands rather than rely on the RF sensing. >> I would really like to use the band information output from the Orion II to >> automatically switch bands on the KPA500. >> Does anybody know of a band decoder which is compatible with both pieces of >> equipment or alternatively has anyone designed something home brew to >> achieve the purpose. >> Thanks in advance to anyone who can help. >> Barry Simpson VK2BJ > > > ______________________________________________________________ > 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 > Message delivered to jackbrin...@me.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 Message delivered to arch...@mail-archive.com
