On 8/20/2019 3:49 PM, Nr4c wrote:
From what I have read on eHam Reviews, it appears that I can run the amp/tuner combo on 117v. from the convenient wall socket. Is that correct, as well?
The KPA500 runs on 120V or 240V. The KAT500 runs on 11-15VDC. My two K3s (original model) run on a 100Ah Bionenne LiFePO4 battery, which stays above 13V for 90% of its charge capacity; the IMD (clicks, splatter) of a K3 increases with lower DC voltage, and lead acid batteries stay below 12V for most of their discharge curve.
The rest of the 12V gear in my shack, in addition shack lighting, runs on a 100Ah sealed lead acid battery. Both batteries are float-charged using Genasun charge regulators from spare Thinkpad power supplies. The Genasuns are MPPT chargers, so they step down the 20V from the power supplies to the battery voltage.
I cannot find any mention of the coax requirements, from the radio/combo out to our 80-meter wire loop antenna. Right now, using only my K2/100 I am able to use 8X coax.
Has nothing to do with the amp -- study the ARRL Handbook and Antenna Book to learn these fundamentals. As others have mentioned, the major reason for using bigger coax is reduced loss, whether mismatched or not.
Someone suggested open wire or two-wire line with a balun at the tuner. That can transmit OK, but unless you're lucky enough to live in the middle of nowhere, that's a recipe for lots of receive noise. You can't work what you can't hear. The quietest antennas are resonant and reasonably well matched to the coax that feeds them, and with a serious common mode choke at the feedpoint (that is, up in the air). Lots of specific advice atk9yc.com/publish.htm. Look for the HF choke cookbook, the RFI tutorial, and how to chase receive noise.
73, Jim K9YC ______________________________________________________________ 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]
