Ugh... did it again. To the reflector! ---------- Forwarded message ---------- From: Reuben Popp <reuben.p...@gmail.com> Date: Mon, Nov 9, 2015 at 6:05 AM Subject: Re: [Elecraft] Fwd: Yet another D104 mic wiring question. To: Bob McGraw - K4TAX <rmcg...@blomand.net>
G'mornin Bob, The cord on the base is only four wires: black, red, white and shield. Note this is a T-UG8 base.. I think the UG8 was the unamplified base? I don't know if either had a cord with more than the four wires; I know my T-UG9 base does. Internal to the base itself there is a blue wire, as detailed in http://www.rollanet.org/~rrars/tech_files/d104_manual.pdf. That is exactly how the mic is wired now. The only thing I did not rewire is the leaf switches as they appeared unmolested. I will take a look at those tonight as I wanted to check their contacts anyway. In the old electromechanical pinball machines, those things would oxidize fairly quickly, so I thought it would be good to check here anyway. I will also give it a whirl with a dummy load. I only have the small dummy load kit from Elecraft... I assume that will be okay? I'll also take a look at bypassing or just flat out removing the preamp circuit. Thanks again and 73 Reuben On Mon, Nov 9, 2015 at 5:33 AM, Bob McGraw - K4TAX <rmcg...@blomand.net> wrote: > Seems like RF getting back into the mike or mike circuit. Be sure the > Red & Blue wires in the UG8 cable to the radio are correctly wired to the > switch on the inside of the base, grip to talk bar switch, and the Black & > White & Shield which are the audio are correct to the mike connector for > the radio. Also try the radio on a dummy load. If it works correct with > the dummy load, then sure bet, it is an RFI issue. That needs to be > corrected. > > If you are using a medium impedance {what ever that is} element, the > internal preamp in the UG8 base should not be needed. There's several > wiring diagrams on the internet, find one and wire the base accordingly. > Personally, unless one is using an original D-104 element, which requires > a very high load impedance in the order of 3 megohms or more, then the > "preamp" in the base is not needed and is often more problematic than > useful. If you are using the original D-104 element, then the preamp is > necessary in order for the mike element to see a proper impedance and the > preamp will drive a lower impedance such as found in today's radios. > But in other words "more crap = more problems". > > I find this site to have good information regarding the D-104 and the UG8 > stand and how to wire the "make before break switch" and the "break before > make switch". http://www.qsl.net/wa2mzf/d104.html < > http://www.qsl.net/wa2mzf/d104.html> > > 73 > Bob, K4TAX > > On 11/8/2015 10:13 PM, Reuben Popp wrote: > >> ast, >> I also turned the D104 5K pot to a hair above its bottom extremity. Now >> blowing or whistling or just plain talking into the mic will cause the K2 >> to cut out with a slight bzzt*pop* [from the radio] as the s-meter goes >> all >> the way to the right and then goes dark. This happens every time. >> > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to reuben.p...@gmail.com > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
