Hi, In the KX3 for Field Day department, we plan to use it for the GOTA station for phone on HF. (Yes, will have antennas not on top of each other and bandpass filters on ALL radios.) Would be great to setup with a headset and foot switch.
Last weekend, I used my KX3 barefoot on 6 and with a transverters-store.com transverter (also barefoot) for 2. 6m antenna was 2 elements about 15 ft above the ground and 2m antenna 6 elements at 10 feet above the ground. I worked a couple of contacts on 2m phone with the headset. Later, when I tried to use the headset for phone on 6, seemed like I was having a feedback problem. Cabling was the stock cabling that comes with the Heil Pro 7 headset and a footswitch. Monitor was on and set to 4. So, ALC didn't indicate anything at the normal level (60), and increasing it very abruptly caused horrible sounding audio. (Yes, acts like positive feedback.) I have a small electret mic on a 1/8 plug thing I bought some time ago from the computer store. (Meant at the time for adding mic to laptops.) I have a 1/8" audio extension cable for it. I plugged that in instead of the headset mic and it seemed to act normally. Is this purely an RF from the TX antenna getting into the mic audio problem or is it something else? Best practice to avoid this problem? On my todo list: - ask here - look at KX3 schematic to see if it has RF ingress mitigation on the mic jack - ask Heil - unplug the Heil mic element and gator clip my cheap electret mic on instead and try on 6m in driveway with identical antenna/mast/radio setup - look for or assemble an RF filter to inline with the mic jack (tough to do with this little time before field day) Thanks and best regards, Drew n7da ps. Other than this, KX3 was great in the VHF test. Worked great with the transverter on 2 and was a lot of fun running barefoot with the sporadic E opening Saturday afternoon & evening. ______________________________________________________________ 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]
