开云体育

Not dumb at all.? I did the same thing when I first dug into one of these Drake transceivers.? Your sideband filters may be OK.? These are very broad filters and thus sound great on the air if they are working, not so great for adjacent channel rejection.? If your audio is sounding very pinched or tinny you may have a problem.? The options to fix it are limited and can get expensive.? I was lucky to find a TR-4 parts radio to rob the filter from.? Even this is not easy.? The early TR-4 uses the same "soup can" filter as the TR-3 so you don't want that.? The later ones use the filter set that is used in the TR-4C radios.? These are great filters but they protrude through a cutout in the chassis floor.? A cutout that is not there in the TR-3.? Mid-generation TR-4s are the best donors since they used a filter that was better than the soup can but fit in the same space.??

If you have a spectrum analyzer you can wrap a probe wire around the 9MHz carrier oscillator tube and you will see the sideband passbands when you switch from one side to the other.? set you span to about 8KHz.? This is also a good way to center your carrier. Instead of a nice 2.4kHz passband I saw a spiky response with one filter even shifted.? If you don't have a spectrum analyzer your ear will still tell you what is going on.? Note that these filters are used in both directions so what you are hearing is what others are going to hear from you when you transmit.