I don't have much in the way of test equipment, so I did a simple experiment using my T-T Eagle and uBITX V3. ?I set both radios to 3.510 MHz, attached both radios to a Top Ten Devices "A/B station selector" via RG-58 jumpers of the same length and connected a dummy load to the uBITX. ?With 5 watts out of the uBITX the Eagle showed a strength of 5 on the s-meter. ?The isolation of the A/B selector is not half bad.
When I changed the Eagle to 7.020 MHz, I could hear the 2nd harmonic weakly with no s-meter reading. ?Listening at 10.530 I could hear the 3rd harmonic a little stronger than at 7.020 and got the smallest s-meter reading possible, one little box on the Eagle display. ?I could hear nothing at the other harmonics.
Next, I got my trusty Argo 509 out of the closet and repeated the experiment with it also set to 5 watts out. ?I could hear it on the Eagle through the 5th harmonic, and it was noticeably louder than the uBITX at 7.020 and 10.530.
This actually proves nothing, of course, but it does tell me that I am not doing anything worse than I have been doing for over 30 years by using the uBITX. ?If an improvement is found for either of these radios, and doesn't require a major rebuild, I will certainly adopt it. ?In the meantime I think I'll ask a local ham buddy to listen while I transmit using an antenna and see if he hears anything objectionable. ?If anyone from this group would like to try that also just email me for a sked.
73,
Tom ?W1EAT
