Discussion in 'Ham Radio Discussions' started by W0PV, Aug 24, 2018.
Amazing there are still folks left that watch CNN !!
Approx. 00.2% of the population.
Wait a minute, that's a familiar statistic?
Amazing there are still folks left that think that's an issue. Unless free speech is a lie.
*disclaimer - I watch none of the cable "news" offerings. I prefer to think for myself.*
Then there is the D-104 appearance in this video,
Somebody has to tell them what to think.
Coincidentally the other day I ran a bunch of different microphones against each other to see what sort of output voltage they would provide into a high impedance load. The situation was this : I've just restored a classic 1961 Lafayette HE-20A CB base station, a truly beautiful vacuum tubes rig, which came to me as junk, and missing its HI-Z condenser MIC. To progress with the restoration of the rig's transmitter section I needed a MIC capable of talking the modulation up to 100%; I wanted to keep with raw unamplified / passive MIC's - no electret condensers requiring power. (Incidentally, the rig's plate modulation scheme is a clever version of choke modulation, using the primary only of the audio output transformer).
Of maybe a dozen MIC's I tried, my crystal D-104 which is dedicated to my Drake TR-4 came out on top, easily giving 100% modulation at comfortable talk level. The dynamic MIC's varied considerably in their oomph levels - one COLT MIC produced very good sounding audio, but couldn't get the HE-20A anywhere near 100% modulation. I've got another D-104, a Silver Eagle actually, but it's dead and I haven't gotten around to looking into it.
Only one other "MIC" made the 100%, and easily so, coming in with its voltage output just a little beneath the lollipop : a vintage ( WW2 ? ) R-14 magnetic earphone, with a DC winding resistance of 1019 Ohms. But although intelligible in the monitor receiver, it sounds pretty crappy - it sounds like a very, very early landline telephone, maybe like a candlestick telephone. Charming perhaps, but before I put the HE-20A on the air for its first contact in who knows how many decades, I want to get just the right dignified MIC for it.
Berj / KI3U
Funny, I believe both "sides" used their respective echo chambers for exactly that; to be told what to think.
No thanks, I can do that for myself without "nutwork" approval. Can you?
Sad thing is that many D-104s these days have bad elements. If you've got a good one then treasure it while you can!
I bought one about ten years ago to use with my 500CX. Sounded like crap but I found some mic elements on an auction site that fit perfectly and sound great, to boot. I have also heard of people who bought replacement elements that sounded terrible. Guess I got lucky; I got two of the elements ridiculously cheap and got good ones.
The hard part is incorporating it into a headset, so it doesn't take up yuuge real estate between the operator and rig, and is always in the right location.