Line in? For a mic level signal? Seems strange. How about the large impedance mismatch?
On Tuesday, September 25, 2012, wrote: > The D-104 that I use is an unamplified mike. However, it's simple enough > to bypass the preamp in the mike stand if you have one. I'm not sure why > you would you even want to use it. No RF-related problems have been > detected in SSB or AM using the "Line In" jack even when driving some old > linears (Heath SB-200 and Johnson Thunderbolt). > > Pete, wa2cwa > http://www.manualman.com > > On Mon, 24 Sep 2012 21:17:10 -0700 Jim Barber <audio...@q.com<javascript:;>> > writes: > > > > I don't believe the original poster was using an amplified D-104, > > but a > > number of us have found that > > there can be issues using the amplified ones with Flex 5K and > > certain > > types of HF amplifiers. The culprit *appears* to be > > a cap that discharges into the audio line when the mic is keyed, > > causing > > a "spike" in the output. > > > > In the case where the HF amplifier has a lot of gain and the op is > > driving it with reduced power from the 5K, > > the spike can be very substantial. Maybe not enough to damage > > equipment, > > but certainly enough for the > > spike to go far over the legal limit - even though normal SSB > > modulation > > with the same mic and > > settings wouldn't. Two of my amps will do it . One has a pair of > > GU-74B > > tetrodes, (grid driven) and the > > other is a cathode-driven single 8877. I haven't tried it with my > > prototype YC156 - I can only imagine. > > > > No doubt someone could fiddle with the D-104 output amp cap, the > > leaf > > switches or any number of things to come > > up with a fix. Perhaps even swamping the output with a fairly > > low-value > > resistor might work, especially since the amp > > boards in the mics have far more gain than necessary to drive the > > mic > > input of the 5K. My excuse is that I haven't > > gotten A Round Tuit. Considering I've sold off my boat anchors and > > so no > > longer use the D-104's regularly, I > > may not get there. > > > > My .02, > > 73, N7CXI > > > > On 9/24/2012 2:40 PM, Lee Mushel wrote: > > > Gentlemen: > > > > > > Pete's comments were just a bit too much for me to ignore! The > > > Lafayette lapel mike! Wow! I hadn't thought about using my > > > Lafayette "Throat mike" dating from about the same time but maybe > > this > > > winter I might get around to it! It has an interesting "gurgly" > > > sound. I think we all know that it is easy to pump stray RF into > > our > > > 5000A's but I want to warn everyone who might want to proceed that > > > > > given the "great age" of the D-104 (I will ignore the potential > > > impedance problem since that is info readily available on the > > > web---including kits) we always have to be aware that at some time > > in > > > it's life someone might have "rewired" it and you have to be sure > > that > > > the shield is not used for signal and that the shield is properly > > > > > grounded to the 5000. My personal opinion is that anyone who > > doesn't > > > use a D-104 and doesn't use Software Defined Radio is simply nor > > > getting maximum enjoyment from his hobby. > > > > > > 73 > > > > > > Lee K9WRU > > > ----- Original Message ----- From: <manual...@juno.com <javascript:;>> > > > To: <wa2...@gmail.com <javascript:;>> > > > Cc: <FlexRadio@flex-radio.biz <javascript:;>> > > > Sent: Monday, September 24, 2012 12:33 PM > > > Subject: Re: [Flexradio] D-104 with Flex 5K > > > > > > > > >> When I use my D-104 with the Flex 5000, mike is connected to the > > "Line > > >> In" jack on the back panel. Then you go to the "Audio Mixer Form" > > and > > >> click on "Line In RCA". You can then use the D-104 pre configured > > > > >> choices > > >> as a starter, and tailor the settings to your own voice > > characteristics. > > >> The D-104 actually works quite well with the Flex 5000. For fun > > and > > >> giggles, I even tried my crystal lapel microphone that I bought > > from > > >> Lafayette Radio in 1961, for $1.95, using the Line In jack and > > tailoring > > >> the audio with the internal mixer. Good audio reports, punchy > > audio, > > >> that > > >> helped make some DX contacts in pileups. > > >> > > >> Pete, wa2cwa > > >> http://www.manualman.com > > >> > > > >> -- > > >>> *Best 73 de WA2SQQ > > >>> Elmwood Park, NJ > > >> > > >> _______________________________________________ > > >> FlexRadio Systems Mailing List > > >> FlexRadio@flex-radio.biz <javascript:;> > > >> > > http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz > > >> Archives: > > http://www.mail-archive.com/flexradio%40flex-radio.biz/ > > >> Knowledge Base: http://kc.flexradio.com/ Homepage: > > >> http://www.flexradio.com/ > > >> > > >> > > > > > > > > > > > > _______________________________________________ > > > FlexRadio Systems Mailing List > > > FlexRadio@flex-radio.biz <javascript:;> > > > > > http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz > > > Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ > > > Knowledge Base: http://kc.flexradio.com/ Homepage: > > > http://www.flexradio.com/ > > > > > > > > > _______________________________________________ > > FlexRadio Systems Mailing List > > FlexRadio@flex-radio.biz <javascript:;> > > http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz > > Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ > > Knowledge Base: http://kc.flexradio.com/ Homepage: > > http://www.flexradio.com/ > > > > _______________________________________________ > FlexRadio Systems Mailing List > FlexRadio@flex-radio.biz <javascript:;> > http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz > Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ > Knowledge Base: http://kc.flexradio.com/ Homepage: > http://www.flexradio.com/ > -- *Best 73 de WA2SQQ Elmwood Park, NJ "The only dumb questions are those we don't ask"* _______________________________________________ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flexradio.com/ Homepage: http://www.flexradio.com/
