Maybe the mic is bad. Crystal mics are rather fragile and susceptible to excessive heat,
73, Ed Richards K6UUZ Simi Valley, Ca 93065 Home of the Air Force 1 pavilion On Tue, 14 Nov 2006 22:03:03 -0600 Jack Schmidling <[EMAIL PROTECTED]> writes: > So I get my new D104 yesterday and spend a few hours removing the > un-needed junk from it and fire up for the NoonTime Forum expecting > all > sorts of kudos and no one can hear me. One guy that could said it > sounded tinny and crummy. > > So I switch to the Kenwood and they all say wonderful. > > I went of over the whole mic again, plugs, wires, grounds and fixed > a > few things and converted it into a boom mic. I make another contact > and > he says tinny but could be his receiver... nice guy. He suggests a > few > caps to check so back to the bench with it. > > After looking around, I find that the mic wire goes directly to the > > grid, no resistor divider and no input cap. I now see what that > strange > mess at the end of the shielded wire is... what is left of a 1m > resistor. > > I replace all this stuff and it still sounds crummy. Then I find > that > R22 is missing in the cathode circuit of the output side of the > first > audio. I replace this and it still sounds crummy. > > To establish "crummy" I set the mic near a nice sounding radio and > set > up a shortwave receiver in an adjacent room to listen to while > loading > up a light bulb. > > In all cases, the Kenwood with the handheld dynamic mic sounds > better. > > The only thing (I have said this many times) that I see left as a > possible problem is C59a/b. These were resistors when I started > working > on it. I replaced these with 47uf and 67uf caps as that was all I > had > left at the required WV. They are supposed to be 15mf. > > I am not sure just what these do so the question is... could these > cause > a lack of lows in the audio? > > If not, any other ideas? > > js > > -- > PHOTO OF THE WEEK: http://schmidling.com/pow.htm > Astronomy, Beer, Cheese, Fiber,Gems, Sausage,Silver > http://schmidling.com > > > _________________________ > AMRadio mailing list > List Home: http://mailman.qth.net/mailman/listinfo/amradio > Partner Website: http://www.amfone.net > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:[email protected] > > ______________________________________________________________ AMRadio mailing list List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:[email protected]
