On 07/19/2015 02:16 PM, Fred Jensen wrote:
The P3 is tunable over quite a range to accommodate various 1st IF's. Would it be feasible to disconnect it from the K3, tune it to 40 meters, transmit AFSK A RTTY at low power into a dummy load, and observe the transmitter's spectrum? Might need a short "antenna" in the BNC connector?
Yes. The P3 will tune up to about 22 MHz (and above that with reduced sensitivity). If you go into the "Xcvr Sel" menu item and select the last item in the list, called "0 Hz". the P3 is tuned directly to the frequency on the screen.
Tune using the CENTER control. (Center En has to be enabled in the menu.) The tuning rate is proportional to span, so select wide span for coarse tuning and then narrow span to dial in to the exact desired center frequency.
One warning: The P3 IF input is unprotected so it is easily damaged by static discharge or high power. I recommend adding a pair of back-to-back switching diodes in parallel across the IF input. I did that using a BNC T connector and BNC plug so I wouldn't have to modify the P3.
Alan N1AL ______________________________________________________________ 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
