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Folks, I will go down to the shack this afternoon and take photos. I'll also draw, schematically, what it looks like (by hand -- I don't have any CAD by which to do this). One thing of note that I

While we are on the subject of Mics, can someone share the wiring diagram for a powered D104 with me? Bill N1WL ? ????????? CallSend SMSAdd to SkypeYou'll need Skype CreditFree via Skype

That was after I changed the mic. Steve Wedge, W1ES Time flies like an arrow. Fruit flies like a banana. Sent from [Proton Mail](https://proton.me/mail/home) for iOS

This one has no foam but there’s a white cottony-looking material that is right behind the grille. It looks identical to the Astatic 1011 I have. That mic does have a powered amp, which I run pretty

This is a 7077. Made by Astatic, rather than Turner. If there are no components in series with the element, then you should be able to get a reading from pin 1 to GND. One may need to press the PTT if

It has 3 wires. I suspect that there’s a common in there. I did think that perhaps this could be a filter but the capacitors are 0.01 and 0.47, which seem like coupling caps. They’re also in

One might have to be cautious with those small feet with the embedded studs. ?In virtually all of the ones I have seen, that stud has started to protrude through the bottom of the foot with just a

For the curious or those who have missing threaded bumpers, here’s the McMaster-Carr information: https://www.mcmaster.com/products/rubber-bumpers/bumpers~/threaded-stud-bumpers~~/ Item No.: 9541K8

Unloading the D104 cartridge makes more sense as the lower transmit passband width is extended.? For transceivers with a conventional 300 Hz to 2.4 kHz transmit bandwidth, the low-end response is

Those small rubber feet with embedded 6-32 studs are, as you note, used on the AC-4 Power Supply, and elsewhere. They are called out in the mounting options shown in the TR-4 series manuals as one of

I was there yesterday when you checked in and I didn't notice that your audio sounded tiny. I did the Heil element in a D104 carcass and had to add a matching transformer to get the impedance up.

FWIW, crystal and ceramic microphone elements look like capacitors. The load impedance forms a high pass filter with the capacitance. The higher the impedance the less the bass roll off. There is also

Yes, I am quite aware of the D-104 head characteristics. I'm the guy who posts the attached graph whenever this comes up. For the TR7 470K x 2 is an ideal load for the cartridge with plenty of voltage

I probably wouldn't have bothered with my TR7 - I would have just connected the D104 to that pin with the 470K resistor. This was in the mid-80's, and I wanted to hook it up to my TS-830S. I don't

I have never run any electronics in a D-104/T-UGxx. Just a 470K or higher resistor in series with the audio line. Still plenty of output to drive most anything and the cartridge is happy with its

You can find photos of the inside of a 7077 here: /g/DRAKE-RADIO/album?id=252836 It does have a small transformer in it to step up the voltage output to drive a TR7. No capacitors.

The 7077 is a dynamic mic, not a ceramic. I looked up 7075. Disregard my remarks. For more on the 7077 see: <https://www.wb4hfn.com/DRAKE/DrakeAcc/Drake%207077%20Microphone.pdf> -- Richard Knoppow Los

The 7075 is a ceramic element mic. Ceramic and crystal elements measure open circuit for DC. They look like capacitors. Your mic may be fine. -- Richard Knoppow Los Angeles WB6KBL SKCC 19998

I have a 7075; tried to get a resistance measurement that was not the PTT closure and every combination was open circuit. Don't have a schematic so I was fumbling in the dark. -- Craig/W8CS

It sounds like someone may have added a filter to the mic. Can you tell if the transformer is open? Is is actually a choke?