By far if in doubt, use the buffer relay! 73 Neal K3NC
On Thu, Aug 18, 2011 at 6:49 PM, Steve Sterling <[email protected]> wrote: > Don-- I haven't seen an answer to this yet, so I'll take my best shot > although there are better experts than I am. > > For my Flex 5000, the voltage limit is 50vdc, so 120vdc would smoke it. > Maybe did you mean 12 vdc? > > Current is 400 ma so the 100 ma would be OK. I don't know what the limits > are on the Flex 3000, I just have my 5000 specs. > > Also, my guess (again I don't know) is that the keying line is pulling down > a relay in the HL-2200. Relays have windings with inductance, and I would > be concerned that when the Flex unkeys, it would generate a high voltage > back-emf spike as the relay coil field collapsed back into the keying > transistor in the Flex, smoking it. So as a minimum, a back-emf protection > diode would be needed across the relay in the HL-2200 (if it really has > one). > > Probably easiest to let the Flex key a buffer relay in your situation. You > could make it work direct though with a little soldering. > > Steve WA7DUH > > > On 8/17/2011 6:34 PM, Don wrote: > >> >> From what I have read in the manual I should be able to do a direct >> connect to the keying relay circuit in an HeathKit HL-2200 amplifier. >> The keying relay has about 120 VDC at 100 ma. on it. I just wanted to >> check here an make sure. >> >> Also does anyone know that device is being use to obtain the 2.5 ms >> switching time? >> >> Don >> ______________________________**_________________ >> FlexRadio Systems Mailing List >> [email protected] >> http://mail.flex-radio.biz/**mailman/listinfo/flexradio_**flex-radio.biz<http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz> >> Archives: >> http://www.mail-archive.com/**flexradio%40flex-radio.biz/<http://www.mail-archive.com/flexradio%40flex-radio.biz/> >> Knowledge Base: http://kc.flexradio.com/ Homepage: >> http://www.flexradio.com/ >> > > > ______________________________**_________________ > FlexRadio Systems Mailing List > [email protected] > http://mail.flex-radio.biz/**mailman/listinfo/flexradio_**flex-radio.biz<http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz> > Archives: > http://www.mail-archive.com/**flexradio%40flex-radio.biz/<http://www.mail-archive.com/flexradio%40flex-radio.biz/> > Knowledge Base: http://kc.flexradio.com/ Homepage: > http://www.flexradio.com/ > -- Abroham Neal Software www.abrohamnealsoftware.com Work:(540) 645 5394 Mobile:(540) 645 8171 _______________________________________________ FlexRadio Systems Mailing List [email protected] http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flexradio.com/ Homepage: http://www.flexradio.com/
