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This is with regards to a medium-power (~50W) CW transmitter that I am
building for 40, 20, 15, & 10m. I would like to use relays to switch the output filters, but have no idea what kind of relay I will need. Dr Sabin mentioned that a high-quality relay is required (http:// http://www.google.com/url?url=http:/...Ii0baYXpyphcAw ) but I have been unable to find anything specific. Could anybody please direct me to a resource that would help me answer this question? Thank you very much. For reference, the transmitter is a redesign of the classic '60s "inexpensive 75W transmitter", originally by Lew McCoy (I believe), one version of which can be found at (http://www.mines.uidaho.edu/ ~glowbugs/inexpensive75wattxmitter.pdf ). It is a simple crystal- controlled 6AG7 followed by an 807 amplifier at 75W input (50W output). The filters are from Ed Wetherhold's article- (available at http://www.arrl.org/tis/info/pdf/9902044.pdf ) 7th order "Chebyshev With Added Zero" to give better second harmonic attenuation. Best regards, Ross, NS7F |
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