Should have clarified: the preamps just match the short high impedence verticals to 75 ohms. Voltage gain is unity but obviously power gain.
Jim ab3cv On Jan 24, 2015, at 5:43 PM, Jim Wiley <jwi...@gci.net> wrote: Jim - Make sure your preamp(s) do not have internal electrolytic power filtering caps. If they do, there is a fair chance the caps may hold the preamp on long enough for it to suffer damage. But, I am wondering why you are using preamps at HF at all? Unless the feedlines are extraordinarily long and you are talking 15 or 10 meters. We use a NCC-1 here with the main and "sense" antennas 200 or 300 feet from the shack, on 160, 80, and 40 meters, with no problems. Careful use of the NCC-1's internal adjustable attenuators has solved any gain differential issues so far. - Jim, KL7CC > On 1/24/2015 1:17 PM, Jim Miller wrote: > I'm getting ready to add a RX array which includes remote preamps and an > NCC-1 phasing unit. > > I'm planning on sending PTT to the NCC-1 which will in turn kill power to > the preamps. As I understand the manual upon key down the PTT line goes > active immediately followed by a default 8ms delay before RF. > > Is that correct? The unstated part in the manual is that PTT is immediate > with key down. > > If that is correct then that will satisfy the 5ms requirement of the > preamps. > > Thanks > > Jim ab3cv > ______________________________________________________________ > 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 jwi...@gci.net > ______________________________________________________________ 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
