I should add that all of the LS04 outputs are summed through 270 Ohm resistors, giving something close to 50 Ohms output. At any rate, I think I get something like 0 dBm into 50 Ohms, with the switchable attenuator dropping it down to -20 dBm. Good level for rx antenna experiments.
73, geo - n4ua On Tue, Nov 25, 2014 at 7:45 AM, George Dubovsky <[email protected]> wrote: > Nothing original here, but I use a cheap 1.8432 packaged logic-level > oscillator driving all the gates of a 74LS04 in parallel, followed by a > switchable 20 dB pad, all packaged up in a small minibox. I run it off a > 12V gel-cell. > > 73, > > geo - n4ua > > On Tue, Nov 25, 2014 at 7:29 AM, Clive GM3POI <[email protected]> > wrote: > >> Hi, Can anyone recommend a stable low power signal source suitable for >> tweaking RX antennas. I only need 160m and will only be used within say 10 >> wavelengths. Preferably something off the shelf. Thanks Clive GM3POI >> >> _________________ >> Topband Reflector Archives - http://www.contesting.com/_topband >> > > _________________ Topband Reflector Archives - http://www.contesting.com/_topband
