I've built two working kits (out of 4 tries--really working to improve soldering skills so I ordered 7, thinking I might get 3 working ones). One kit is the 4.1--which has a beeper sidetone for CW. http://www.ebay.com/itm/HAM-RADIO-4...146279?hash=item4d388b78a7:g:F7gAAOSwsB9V~9Eh The other is the more standard Chinese kit without the beeper, and a slightly different board setup, but basically the same parts/kit/etc. than the other one. http://www.ebay.com/itm/9-14V-DIY-R...817672?hash=item33ac0c4648:g:89AAAOSw~bFWNyIG Well, anyways, I am hearing slight 40m noise on the 'beeper one' on the end-fed antenna, and barely detectable 40m noise on the 80-10 trap dipole. However, the AM broadcast towers are nearly LOS from here, mounted on the West Hills above Portland, and they come in really strong. I'd guess there are at least a dozen there, though I am hearing one particularly strong. Is there a trick to reducing or eliminating this AM interference? I'm presuming it is AM anyways. Good 'ole Clark Howard was playing. Some are saying use ferrite beads, others are saying a metal enclosure, etc. I'm not familiar with the ferrite bead technique--but something I read said the guy put them on the power supply line, the headphones line, and somewhere else. I'll have to figure out where to get ones 'that small', unless I can wind the line through like a choke on a big ferrite. The trap dipole has a bunch of ferrite core things on it right after the tuner--the big clamshell 1" ones--I think there are 6. The end fed doesn't appear to have any. The trap dipole was much louder than the end-fed, and boosted the BCI with it just as much. So far I am admiring overcoming the tiny components and hoping to learn CW this way with a straight key, and not expecting much in the way of QSOs. If my dad can hear me across town I'll consider it a success. Not sure if the BCI screws up my TX to someone, or if it is just screwing up my RX. Ideas?