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I own a Kenwood Ts-440. There are mods that most anyone can do like replacement of a few capacitors for a more fuller sound. I have replaced the 455 ceramic filter with an older cb radio ceramic filter and it was night and day difference. Talk about voodoo audio and beyond, that's all I did to...

I have and it worked out well for me. I have and older 2517 that I kinda Frankensteined with mods or improvements to my desire. With that large of a box and chassis I had plenty of room to experiment. All I did was I tapped into the microphone jack itself on the inside of the radio. I left...

I have always been skeptical that a real emergency could be aided with the use of amateur radio or even cb radio. Today I heard on the cb radio an actual call for help..I think. On the cb radio channel 15 at approximately 1320 I heard a guy out in Arizona calling for help. He was asking for the...

Thank you To all on this thread! I have done what Mr. Lawrence has shown to do with his pictures. I have the 1.5 version of the 503 board for reference. I am learning as I go and very appreciative of others input. I have completed this modification to a non HD KL-503. Disengaging the driver for...

I had failed to mention earlier that I am running 4 rack units for superb voice communication that I want as clean as I can get. I understand I probably am the only fool trying to make a 503 sound well. This is just what I have and I try to make the best of it. I'll post the results of the...

I just bought the 503 a few weeks ago to replace a 203 that works as it should. What a disappointment. It was like the tease of more watts but could only use the same as the 203. Both the 203 and the 503 for me will start to back swing at around 40 watts dead key from the amplifier. Now I expect...